summaryrefslogtreecommitdiff
path: root/platforms/avr
diff options
context:
space:
mode:
authorJoel Challis <git@zvecr.com>2021-08-17 23:43:09 +0100
committerGitHub <noreply@github.com>2021-08-17 23:43:09 +0100
commit1bb7af4d446174b7181c9bb22dbd14c93642ea10 (patch)
tree894eceeb29cc2c00f6b0f08a4ca177da7f172424 /platforms/avr
parent483691dd73e5260fac958c524e0a12e705db43f6 (diff)
downloadqmk_firmware-1bb7af4d446174b7181c9bb22dbd14c93642ea10.tar.gz
qmk_firmware-1bb7af4d446174b7181c9bb22dbd14c93642ea10.zip
Relocate platform specific drivers (#13894)
* Relocate platform specific drivers * Move stm eeprom * Tidy up slightly
Diffstat (limited to 'platforms/avr')
-rw-r--r--platforms/avr/drivers/analog.c138
-rw-r--r--platforms/avr/drivers/analog.h53
-rw-r--r--platforms/avr/drivers/glcdfont.c23
-rw-r--r--platforms/avr/drivers/hd44780.c536
-rw-r--r--platforms/avr/drivers/hd44780.h348
-rw-r--r--platforms/avr/drivers/i2c_master.c241
-rw-r--r--platforms/avr/drivers/i2c_master.h43
-rw-r--r--platforms/avr/drivers/i2c_slave.c111
-rw-r--r--platforms/avr/drivers/i2c_slave.h41
-rw-r--r--platforms/avr/drivers/serial.c529
-rw-r--r--platforms/avr/drivers/spi_master.c180
-rw-r--r--platforms/avr/drivers/spi_master.h59
-rw-r--r--platforms/avr/drivers/ssd1306.c319
-rw-r--r--platforms/avr/drivers/ssd1306.h87
-rw-r--r--platforms/avr/drivers/uart.c170
-rw-r--r--platforms/avr/drivers/uart.h35
-rw-r--r--platforms/avr/drivers/ws2812.c176
-rw-r--r--platforms/avr/drivers/ws2812_i2c.c27
18 files changed, 3116 insertions, 0 deletions
diff --git a/platforms/avr/drivers/analog.c b/platforms/avr/drivers/analog.c
new file mode 100644
index 0000000000..8d299ffdb9
--- /dev/null
+++ b/platforms/avr/drivers/analog.c
@@ -0,0 +1,138 @@
+/* Copyright 2015 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <stdint.h>
+#include "analog.h"
+
+static uint8_t aref = ADC_REF_POWER;
+
+void analogReference(uint8_t mode) { aref = mode & (_BV(REFS1) | _BV(REFS0)); }
+
+// Arduino compatible pin input
+int16_t analogRead(uint8_t pin) {
+#if defined(__AVR_ATmega32U4__)
+ // clang-format off
+ static const uint8_t PROGMEM pin_to_mux[] = {
+ //A0 A1 A2 A3 A4 A5
+ //F7 F6 F5 F4 F1 F0
+ 0x07, 0x06, 0x05, 0x04, 0x01, 0x00,
+ //A6 A7 A8 A9 A10 A11
+ //D4 D7 B4 B5 B6 D6
+ 0x20, 0x22, 0x23, 0x24, 0x25, 0x21
+ };
+ // clang-format on
+ if (pin >= 12) return 0;
+ return adc_read(pgm_read_byte(pin_to_mux + pin));
+#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+ if (pin >= 8) return 0;
+ return adc_read(pin);
+#else
+ return 0;
+#endif
+}
+
+int16_t analogReadPin(pin_t pin) { return adc_read(pinToMux(pin)); }
+
+uint8_t pinToMux(pin_t pin) {
+ switch (pin) {
+ // clang-format off
+#if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+ case F0: return 0; // ADC0
+ case F1: return _BV(MUX0); // ADC1
+ case F2: return _BV(MUX1); // ADC2
+ case F3: return _BV(MUX1) | _BV(MUX0); // ADC3
+ case F4: return _BV(MUX2); // ADC4
+ case F5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ case F6: return _BV(MUX2) | _BV(MUX1); // ADC6
+ case F7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7
+ default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#elif defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+ case F0: return 0; // ADC0
+ case F1: return _BV(MUX0); // ADC1
+ case F4: return _BV(MUX2); // ADC4
+ case F5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ case F6: return _BV(MUX2) | _BV(MUX1); // ADC6
+ case F7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7
+ case D4: return _BV(MUX5); // ADC8
+ case D6: return _BV(MUX5) | _BV(MUX0); // ADC9
+ case D7: return _BV(MUX5) | _BV(MUX1); // ADC10
+ case B4: return _BV(MUX5) | _BV(MUX1) | _BV(MUX0); // ADC11
+ case B5: return _BV(MUX5) | _BV(MUX2); // ADC12
+ case B6: return _BV(MUX5) | _BV(MUX2) | _BV(MUX0); // ADC13
+ default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#elif defined(__AVR_ATmega32A__)
+ case A0: return 0; // ADC0
+ case A1: return _BV(MUX0); // ADC1
+ case A2: return _BV(MUX1); // ADC2
+ case A3: return _BV(MUX1) | _BV(MUX0); // ADC3
+ case A4: return _BV(MUX2); // ADC4
+ case A5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ case A6: return _BV(MUX2) | _BV(MUX1); // ADC6
+ case A7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7
+ default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+ case C0: return 0; // ADC0
+ case C1: return _BV(MUX0); // ADC1
+ case C2: return _BV(MUX1); // ADC2
+ case C3: return _BV(MUX1) | _BV(MUX0); // ADC3
+ case C4: return _BV(MUX2); // ADC4
+ case C5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ // ADC7:6 not present in DIP package and not shared by GPIO pins
+ default: return _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#endif
+ // clang-format on
+ }
+ return 0;
+}
+
+int16_t adc_read(uint8_t mux) {
+ uint16_t low;
+
+ // Enable ADC and configure prescaler
+ ADCSRA = _BV(ADEN) | ADC_PRESCALER;
+
+#if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+ // High speed mode and ADC8-13
+ ADCSRB = _BV(ADHSM) | (mux & _BV(MUX5));
+#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+ // High speed mode only
+ ADCSRB = _BV(ADHSM);
+#endif
+
+ // Configure mux input
+#if defined(MUX4)
+ ADMUX = aref | (mux & (_BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0)));
+#else
+ ADMUX = aref | (mux & (_BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0)));
+#endif
+
+ // Start the conversion
+ ADCSRA |= _BV(ADSC);
+ // Wait for result
+ while (ADCSRA & _BV(ADSC))
+ ;
+ // Must read LSB first
+ low = ADCL;
+ // Must read MSB only once!
+ low |= (ADCH << 8);
+
+ // turn off the ADC
+ ADCSRA &= ~(1 << ADEN);
+
+ return low;
+}
diff --git a/platforms/avr/drivers/analog.h b/platforms/avr/drivers/analog.h
new file mode 100644
index 0000000000..058882450d
--- /dev/null
+++ b/platforms/avr/drivers/analog.h
@@ -0,0 +1,53 @@
+/* Copyright 2015 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "quantum.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void analogReference(uint8_t mode);
+int16_t analogRead(uint8_t pin);
+
+int16_t analogReadPin(pin_t pin);
+uint8_t pinToMux(pin_t pin);
+
+int16_t adc_read(uint8_t mux);
+#ifdef __cplusplus
+}
+#endif
+
+#define ADC_REF_EXTERNAL 0 // AREF, Internal Vref turned off
+#define ADC_REF_POWER _BV(REFS0) // AVCC with external capacitor on AREF pin
+#define ADC_REF_INTERNAL (_BV(REFS1) | _BV(REFS0)) // Internal 2.56V Voltage Reference with external capacitor on AREF pin (1.1V for 328P)
+
+// These prescaler values are for high speed mode, ADHSM = 1
+#if F_CPU == 16000000L || F_CPU == 12000000L
+# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS1)) // /64
+#elif F_CPU == 8000000L
+# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS0)) // /32
+#elif F_CPU == 4000000L
+# define ADC_PRESCALER (_BV(ADPS2)) // /16
+#elif F_CPU == 2000000L
+# define ADC_PRESCALER (_BV(ADPS1) | _BV(ADPS0)) // /8
+#elif F_CPU == 1000000L
+# define ADC_PRESCALER _BV(ADPS1) // /4
+#else
+# define ADC_PRESCALER _BV(ADPS0) // /2
+#endif
diff --git a/platforms/avr/drivers/glcdfont.c b/platforms/avr/drivers/glcdfont.c
new file mode 100644
index 0000000000..5e763b054f
--- /dev/null
+++ b/platforms/avr/drivers/glcdfont.c
@@ -0,0 +1,23 @@
+// This is the 'classic' fixed-space bitmap font for Adafruit_GFX since 1.0.
+// See gfxfont.h for newer custom bitmap font info.
+
+#include "progmem.h"
+
+// Standard ASCII 5x7 font
+
+static const unsigned char font[] PROGMEM = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 0x3E, 0x6B, 0x4F, 0x6B, 0x3E, 0x1C, 0x3E, 0x7C, 0x3E, 0x1C, 0x18, 0x3C, 0x7E, 0x3C, 0x18, 0x1C, 0x57, 0x7D, 0x57, 0x1C, 0x1C, 0x5E, 0x7F, 0x5E, 0x1C, 0x00, 0x18, 0x3C, 0x18, 0x00, 0xFF, 0xE7, 0xC3, 0xE7, 0xFF, 0x00, 0x18, 0x24, 0x18, 0x00, 0xFF, 0xE7, 0xDB, 0xE7, 0xFF, 0x30, 0x48, 0x3A, 0x06, 0x0E, 0x26, 0x29, 0x79, 0x29, 0x26, 0x40, 0x7F, 0x05, 0x05, 0x07, 0x40, 0x7F, 0x05, 0x25, 0x3F, 0x5A, 0x3C, 0xE7, 0x3C, 0x5A, 0x7F, 0x3E, 0x1C, 0x1C, 0x08, 0x08, 0x1C, 0x1C, 0x3E, 0x7F, 0x14, 0x22, 0x7F, 0x22, 0x14, 0x5F, 0x5F, 0x00, 0x5F, 0x5F, 0x06, 0x09, 0x7F, 0x01, 0x7F, 0x00, 0x66, 0x89, 0x95, 0x6A, 0x60, 0x60, 0x60, 0x60, 0x60, 0x94, 0xA2, 0xFF, 0xA2, 0x94, 0x08, 0x04, 0x7E, 0x04, 0x08, 0x10, 0x20, 0x7E, 0x20, 0x10, 0x08, 0x08, 0x2A, 0x1C, 0x08, 0x08, 0x1C, 0x2A, 0x08, 0x08, 0x1E, 0x10, 0x10, 0x10, 0x10, 0x0C, 0x1E, 0x0C, 0x1E, 0x0C,
+ 0x30, 0x38, 0x3E, 0x38, 0x30, 0x06, 0x0E, 0x3E, 0x0E, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5F, 0x00, 0x00, 0x00, 0x07, 0x00, 0x07, 0x00, 0x14, 0x7F, 0x14, 0x7F, 0x14, 0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x23, 0x13, 0x08, 0x64, 0x62, 0x36, 0x49, 0x56, 0x20, 0x50, 0x00, 0x08, 0x07, 0x03, 0x00, 0x00, 0x1C, 0x22, 0x41, 0x00, 0x00, 0x41, 0x22, 0x1C, 0x00, 0x2A, 0x1C, 0x7F, 0x1C, 0x2A, 0x08, 0x08, 0x3E, 0x08, 0x08, 0x00, 0x80, 0x70, 0x30, 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x60, 0x60, 0x00, 0x20, 0x10, 0x08, 0x04, 0x02, 0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00, 0x42, 0x7F, 0x40, 0x00, 0x72, 0x49, 0x49, 0x49, 0x46, 0x21, 0x41, 0x49, 0x4D, 0x33, 0x18, 0x14, 0x12, 0x7F, 0x10, 0x27, 0x45, 0x45, 0x45, 0x39, 0x3C, 0x4A, 0x49, 0x49, 0x31, 0x41, 0x21, 0x11, 0x09, 0x07, 0x36, 0x49, 0x49, 0x49, 0x36, 0x46, 0x49, 0x49, 0x29, 0x1E, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x40, 0x34, 0x00, 0x00,
+ 0x00, 0x08, 0x14, 0x22, 0x41, 0x14, 0x14, 0x14, 0x14, 0x14, 0x00, 0x41, 0x22, 0x14, 0x08, 0x02, 0x01, 0x59, 0x09, 0x06, 0x3E, 0x41, 0x5D, 0x59, 0x4E, 0x7C, 0x12, 0x11, 0x12, 0x7C, 0x7F, 0x49, 0x49, 0x49, 0x36, 0x3E, 0x41, 0x41, 0x41, 0x22, 0x7F, 0x41, 0x41, 0x41, 0x3E, 0x7F, 0x49, 0x49, 0x49, 0x41, 0x7F, 0x09, 0x09, 0x09, 0x01, 0x3E, 0x41, 0x41, 0x51, 0x73, 0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00, 0x41, 0x7F, 0x41, 0x00, 0x20, 0x40, 0x41, 0x3F, 0x01, 0x7F, 0x08, 0x14, 0x22, 0x41, 0x7F, 0x40, 0x40, 0x40, 0x40, 0x7F, 0x02, 0x1C, 0x02, 0x7F, 0x7F, 0x04, 0x08, 0x10, 0x7F, 0x3E, 0x41, 0x41, 0x41, 0x3E, 0x7F, 0x09, 0x09, 0x09, 0x06, 0x3E, 0x41, 0x51, 0x21, 0x5E, 0x7F, 0x09, 0x19, 0x29, 0x46, 0x26, 0x49, 0x49, 0x49, 0x32, 0x03, 0x01, 0x7F, 0x01, 0x03, 0x3F, 0x40, 0x40, 0x40, 0x3F, 0x1F, 0x20, 0x40, 0x20, 0x1F, 0x3F, 0x40, 0x38, 0x40, 0x3F, 0x63, 0x14, 0x08, 0x14, 0x63, 0x03, 0x04, 0x78, 0x04, 0x03,
+ 0x61, 0x59, 0x49, 0x4D, 0x43, 0x00, 0x7F, 0x41, 0x41, 0x41, 0x02, 0x04, 0x08, 0x10, 0x20, 0x00, 0x41, 0x41, 0x41, 0x7F, 0x04, 0x02, 0x01, 0x02, 0x04, 0x40, 0x40, 0x40, 0x40, 0x40, 0x00, 0x03, 0x07, 0x08, 0x00, 0x20, 0x54, 0x54, 0x78, 0x40, 0x7F, 0x28, 0x44, 0x44, 0x38, 0x38, 0x44, 0x44, 0x44, 0x28, 0x38, 0x44, 0x44, 0x28, 0x7F, 0x38, 0x54, 0x54, 0x54, 0x18, 0x00, 0x08, 0x7E, 0x09, 0x02, 0x18, 0xA4, 0xA4, 0x9C, 0x78, 0x7F, 0x08, 0x04, 0x04, 0x78, 0x00, 0x44, 0x7D, 0x40, 0x00, 0x20, 0x40, 0x40, 0x3D, 0x00, 0x7F, 0x10, 0x28, 0x44, 0x00, 0x00, 0x41, 0x7F, 0x40, 0x00, 0x7C, 0x04, 0x78, 0x04, 0x78, 0x7C, 0x08, 0x04, 0x04, 0x78, 0x38, 0x44, 0x44, 0x44, 0x38, 0xFC, 0x18, 0x24, 0x24, 0x18, 0x18, 0x24, 0x24, 0x18, 0xFC, 0x7C, 0x08, 0x04, 0x04, 0x08, 0x48, 0x54, 0x54, 0x54, 0x24, 0x04, 0x04, 0x3F, 0x44, 0x24, 0x3C, 0x40, 0x40, 0x20, 0x7C, 0x1C, 0x20, 0x40, 0x20, 0x1C, 0x3C, 0x40, 0x30, 0x40, 0x3C,
+ 0x44, 0x28, 0x10, 0x28, 0x44, 0x4C, 0x90, 0x90, 0x90, 0x7C, 0x44, 0x64, 0x54, 0x4C, 0x44, 0x00, 0x08, 0x36, 0x41, 0x00, 0x00, 0x00, 0x77, 0x00, 0x00, 0x00, 0x41, 0x36, 0x08, 0x00, 0x02, 0x01, 0x02, 0x04, 0x02, 0x3C, 0x26, 0x23, 0x26, 0x3C, 0x1E, 0xA1, 0xA1, 0x61, 0x12, 0x3A, 0x40, 0x40, 0x20, 0x7A, 0x38, 0x54, 0x54, 0x55, 0x59, 0x21, 0x55, 0x55, 0x79, 0x41, 0x22, 0x54, 0x54, 0x78, 0x42, // a-umlaut
+ 0x21, 0x55, 0x54, 0x78, 0x40, 0x20, 0x54, 0x55, 0x79, 0x40, 0x0C, 0x1E, 0x52, 0x72, 0x12, 0x39, 0x55, 0x55, 0x55, 0x59, 0x39, 0x54, 0x54, 0x54, 0x59, 0x39, 0x55, 0x54, 0x54, 0x58, 0x00, 0x00, 0x45, 0x7C, 0x41, 0x00, 0x02, 0x45, 0x7D, 0x42, 0x00, 0x01, 0x45, 0x7C, 0x40, 0x7D, 0x12, 0x11, 0x12, 0x7D, // A-umlaut
+ 0xF0, 0x28, 0x25, 0x28, 0xF0, 0x7C, 0x54, 0x55, 0x45, 0x00, 0x20, 0x54, 0x54, 0x7C, 0x54, 0x7C, 0x0A, 0x09, 0x7F, 0x49, 0x32, 0x49, 0x49, 0x49, 0x32, 0x3A, 0x44, 0x44, 0x44, 0x3A, // o-umlaut
+ 0x32, 0x4A, 0x48, 0x48, 0x30, 0x3A, 0x41, 0x41, 0x21, 0x7A, 0x3A, 0x42, 0x40, 0x20, 0x78, 0x00, 0x9D, 0xA0, 0xA0, 0x7D, 0x3D, 0x42, 0x42, 0x42, 0x3D, // O-umlaut
+ 0x3D, 0x40, 0x40, 0x40, 0x3D, 0x3C, 0x24, 0xFF, 0x24, 0x24, 0x48, 0x7E, 0x49, 0x43, 0x66, 0x2B, 0x2F, 0xFC, 0x2F, 0x2B, 0xFF, 0x09, 0x29, 0xF6, 0x20, 0xC0, 0x88, 0x7E, 0x09, 0x03, 0x20, 0x54, 0x54, 0x79, 0x41, 0x00, 0x00, 0x44, 0x7D, 0x41, 0x30, 0x48, 0x48, 0x4A, 0x32, 0x38, 0x40, 0x40, 0x22, 0x7A, 0x00, 0x7A, 0x0A, 0x0A, 0x72, 0x7D, 0x0D, 0x19, 0x31, 0x7D, 0x26, 0x29, 0x29, 0x2F, 0x28, 0x26, 0x29, 0x29, 0x29, 0x26, 0x30, 0x48, 0x4D, 0x40, 0x20, 0x38, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x38, 0x2F, 0x10, 0xC8, 0xAC, 0xBA, 0x2F, 0x10, 0x28, 0x34, 0xFA, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x08, 0x14, 0x2A, 0x14, 0x22, 0x22, 0x14, 0x2A, 0x14, 0x08, 0x55, 0x00, 0x55, 0x00, 0x55, // #176 (25% block) missing in old code
+ 0xAA, 0x55, 0xAA, 0x55, 0xAA, // 50% block
+ 0xFF, 0x55, 0xFF, 0x55, 0xFF, // 75% block
+ 0x00, 0x00, 0x00, 0xFF, 0x00, 0x10, 0x10, 0x10, 0xFF, 0x00, 0x14, 0x14, 0x14, 0xFF, 0x00, 0x10, 0x10, 0xFF, 0x00, 0xFF, 0x10, 0x10, 0xF0, 0x10, 0xF0, 0x14, 0x14, 0x14, 0xFC, 0x00, 0x14, 0x14, 0xF7, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x14, 0x14, 0xF4, 0x04, 0xFC, 0x14, 0x14, 0x17, 0x10, 0x1F, 0x10, 0x10, 0x1F, 0x10, 0x1F, 0x14, 0x14, 0x14, 0x1F, 0x00, 0x10, 0x10, 0x10, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x10, 0x10, 0x10, 0x10, 0x1F, 0x10, 0x10, 0x10, 0x10, 0xF0, 0x10, 0x00, 0x00, 0x00, 0xFF, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xFF, 0x10, 0x00, 0x00, 0x00, 0xFF, 0x14, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0x1F, 0x10, 0x17, 0x00, 0x00, 0xFC, 0x04, 0xF4, 0x14, 0x14, 0x17, 0x10, 0x17, 0x14, 0x14, 0xF4, 0x04, 0xF4, 0x00, 0x00, 0xFF, 0x00, 0xF7, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0xF7, 0x00, 0xF7, 0x14, 0x14, 0x14, 0x17, 0x14, 0x10, 0x10, 0x1F, 0x10, 0x1F,
+ 0x14, 0x14, 0x14, 0xF4, 0x14, 0x10, 0x10, 0xF0, 0x10, 0xF0, 0x00, 0x00, 0x1F, 0x10, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x14, 0x00, 0x00, 0x00, 0xFC, 0x14, 0x00, 0x00, 0xF0, 0x10, 0xF0, 0x10, 0x10, 0xFF, 0x10, 0xFF, 0x14, 0x14, 0x14, 0xFF, 0x14, 0x10, 0x10, 0x10, 0x1F, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x10, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x38, 0x44, 0x44, 0x38, 0x44, 0xFC, 0x4A, 0x4A, 0x4A, 0x34, // sharp-s or beta
+ 0x7E, 0x02, 0x02, 0x06, 0x06, 0x02, 0x7E, 0x02, 0x7E, 0x02, 0x63, 0x55, 0x49, 0x41, 0x63, 0x38, 0x44, 0x44, 0x3C, 0x04, 0x40, 0x7E, 0x20, 0x1E, 0x20, 0x06, 0x02, 0x7E, 0x02, 0x02, 0x99, 0xA5, 0xE7, 0xA5, 0x99, 0x1C, 0x2A, 0x49, 0x2A, 0x1C, 0x4C, 0x72, 0x01, 0x72, 0x4C, 0x30, 0x4A, 0x4D, 0x4D, 0x30, 0x30, 0x48, 0x78, 0x48, 0x30, 0xBC, 0x62, 0x5A, 0x46, 0x3D, 0x3E, 0x49, 0x49, 0x49, 0x00, 0x7E, 0x01, 0x01, 0x01, 0x7E, 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, 0x44, 0x44, 0x5F, 0x44, 0x44, 0x40, 0x51, 0x4A, 0x44, 0x40, 0x40, 0x44, 0x4A, 0x51, 0x40, 0x00, 0x00, 0xFF, 0x01, 0x03, 0xE0, 0x80, 0xFF, 0x00, 0x00, 0x08, 0x08, 0x6B, 0x6B, 0x08, 0x36, 0x12, 0x36, 0x24, 0x36, 0x06, 0x0F, 0x09, 0x0F, 0x06, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00, 0x30, 0x40, 0xFF, 0x01, 0x01, 0x00, 0x1F, 0x01, 0x01, 0x1E, 0x00, 0x19, 0x1D, 0x17, 0x12, 0x00, 0x3C, 0x3C, 0x3C, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00 // #255 NBSP
+};
diff --git a/platforms/avr/drivers/hd44780.c b/platforms/avr/drivers/hd44780.c
new file mode 100644
index 0000000000..f71069dece
--- /dev/null
+++ b/platforms/avr/drivers/hd44780.c
@@ -0,0 +1,536 @@
+/****************************************************************************
+ Title: HD44780U LCD library
+ Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
+ License: GNU General Public License Version 3
+ File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $
+ Software: AVR-GCC 3.3
+ Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega
+
+ DESCRIPTION
+ Basic routines for interfacing a HD44780U-based text lcd display
+
+ Originally based on Volker Oth's lcd library,
+ changed lcd_init(), added additional constants for lcd_command(),
+ added 4-bit I/O mode, improved and optimized code.
+
+ Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
+ 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
+
+ Memory mapped mode compatible with Kanda STK200, but supports also
+ generation of R/W signal through A8 address line.
+
+ USAGE
+ See the C include lcd.h file for a description of each function
+
+*****************************************************************************/
+#include <inttypes.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "hd44780.h"
+
+/*
+** constants/macros
+*/
+#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */
+#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
+/* on ATmega64/128 PINF is on port 0x00 and not 0x60 */
+# define PIN(x) (&PORTF == &(x) ? _SFR_IO8(0x00) : (*(&x - 2)))
+#else
+# define PIN(x) (*(&x - 2)) /* address of input register of port x */
+#endif
+
+#if LCD_IO_MODE
+# define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE)
+# define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN);
+# define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN);
+# define lcd_e_toggle() toggle_e()
+# define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN)
+# define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN)
+# define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN)
+# define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN)
+#endif
+
+#if LCD_IO_MODE
+# if LCD_LINES == 1
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE
+# else
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES
+# endif
+#else
+# if LCD_LINES == 1
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE
+# else
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES
+# endif
+#endif
+
+#if LCD_CONTROLLER_KS0073
+# if LCD_LINES == 4
+
+# define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */
+# define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */
+# define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */
+
+# endif
+#endif
+
+/*
+** function prototypes
+*/
+#if LCD_IO_MODE
+static void toggle_e(void);
+#endif
+
+/*
+** local functions
+*/
+
+/*************************************************************************
+delay for a minimum of <us> microseconds
+the number of loops is calculated at compile-time from MCU clock frequency
+*************************************************************************/
+#define delay(us) _delay_us(us)
+
+#if LCD_IO_MODE
+/* toggle Enable Pin to initiate write */
+static void toggle_e(void) {
+ lcd_e_high();
+ lcd_e_delay();
+ lcd_e_low();
+}
+#endif
+
+/*************************************************************************
+Low-level function to write byte to LCD controller
+Input: data byte to write to LCD
+ rs 1: write data
+ 0: write instruction
+Returns: none
+*************************************************************************/
+#if LCD_IO_MODE
+static void lcd_write(uint8_t data, uint8_t rs) {
+ unsigned char dataBits;
+
+ if (rs) { /* write data (RS=1, RW=0) */
+ lcd_rs_high();
+ } else { /* write instruction (RS=0, RW=0) */
+ lcd_rs_low();
+ }
+ lcd_rw_low(); /* RW=0 write mode */
+
+ if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
+ /* configure data pins as output */
+ DDR(LCD_DATA0_PORT) |= 0x0F;
+
+ /* output high nibble first */
+ dataBits = LCD_DATA0_PORT & 0xF0;
+ LCD_DATA0_PORT = dataBits | ((data >> 4) & 0x0F);
+ lcd_e_toggle();
+
+ /* output low nibble */
+ LCD_DATA0_PORT = dataBits | (data & 0x0F);
+ lcd_e_toggle();
+
+ /* all data pins high (inactive) */
+ LCD_DATA0_PORT = dataBits | 0x0F;
+ } else {
+ /* configure data pins as output */
+ DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
+ DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
+ DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
+ DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
+
+ /* output high nibble first */
+ LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
+ LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
+ LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
+ LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
+ if (data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
+ if (data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
+ if (data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
+ if (data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
+ lcd_e_toggle();
+
+ /* output low nibble */
+ LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
+ LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
+ LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
+ LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
+ if (data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
+ if (data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
+ if (data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
+ if (data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
+ lcd_e_toggle();
+
+ /* all data pins high (inactive) */
+ LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
+ LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
+ LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
+ LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
+ }
+}
+#else
+# define lcd_write(d, rs) \
+ if (rs) \
+ *(volatile uint8_t *)(LCD_IO_DATA) = d; \
+ else \
+ *(volatile uint8_t *)(LCD_IO_FUNCTION) = d;
+/* rs==0 -> write instruction to LCD_IO_FUNCTION */
+/* rs==1 -> write data to LCD_IO_DATA */
+#endif
+
+/*************************************************************************
+Low-level function to read byte from LCD controller
+Input: rs 1: read data
+ 0: read busy flag / address counter
+Returns: byte read from LCD controller
+*************************************************************************/
+#if LCD_IO_MODE
+static uint8_t lcd_read(uint8_t rs) {
+ uint8_t data;
+
+ if (rs)
+ lcd_rs_high(); /* RS=1: read data */
+ else
+ lcd_rs_low(); /* RS=0: read busy flag */
+ lcd_rw_high(); /* RW=1 read mode */
+
+ if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
+ DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */
+
+ lcd_e_high();
+ lcd_e_delay();
+ data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */
+ lcd_e_low();
+
+ lcd_e_delay(); /* Enable 500ns low */
+
+ lcd_e_high();
+ lcd_e_delay();
+ data |= PIN(LCD_DATA0_PORT) & 0x0F; /* read low nibble */
+ lcd_e_low();
+ } else {
+ /* configure data pins as input */
+ DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN);
+ DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN);
+ DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN);
+ DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN);
+
+ /* read high nibble first */
+ lcd_e_high();
+ lcd_e_delay();
+ data = 0;
+ if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x10;
+ if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x20;
+ if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x40;
+ if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x80;
+ lcd_e_low();
+
+ lcd_e_delay(); /* Enable 500ns low */
+
+ /* read low nibble */
+ lcd_e_high();
+ lcd_e_delay();
+ if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x01;
+ if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x02;
+ if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x04;
+ if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x08;
+ lcd_e_low();
+ }
+ return data;
+}
+#else
+# define lcd_read(rs) (rs) ? *(volatile uint8_t *)(LCD_IO_DATA + LCD_IO_READ) : *(volatile uint8_t *)(LCD_IO_FUNCTION + LCD_IO_READ)
+/* rs==0 -> read instruction from LCD_IO_FUNCTION */
+/* rs==1 -> read data from LCD_IO_DATA */
+#endif
+
+/*************************************************************************
+loops while lcd is busy, returns address counter
+*************************************************************************/
+static uint8_t lcd_waitbusy(void)
+
+{
+ register uint8_t c;
+
+ /* wait until busy flag is cleared */
+ while ((c = lcd_read(0)) & (1 << LCD_BUSY)) {
+ }
+
+ /* the address counter is updated 4us after the busy flag is cleared */
+ delay(LCD_DELAY_BUSY_FLAG);
+
+ /* now read the address counter */
+ return (lcd_read(0)); // return address counter
+
+} /* lcd_waitbusy */
+
+/*************************************************************************
+Move cursor to the start of next line or to the first line if the cursor
+is already on the last line.
+*************************************************************************/
+static inline void lcd_newline(uint8_t pos) {
+ register uint8_t addressCounter;
+
+#if LCD_LINES == 1
+ addressCounter = 0;
+#endif
+#if LCD_LINES == 2
+ if (pos < (LCD_START_LINE2))
+ addressCounter = LCD_START_LINE2;
+ else
+ addressCounter = LCD_START_LINE1;
+#endif
+#if LCD_LINES == 4
+# if KS0073_4LINES_MODE
+ if (pos < LCD_START_LINE2)
+ addressCounter = LCD_START_LINE2;
+ else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3))
+ addressCounter = LCD_START_LINE3;
+ else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4))
+ addressCounter = LCD_START_LINE4;
+ else
+ addressCounter = LCD_START_LINE1;
+# else
+ if (pos < LCD_START_LINE3)
+ addressCounter = LCD_START_LINE2;
+ else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4))
+ addressCounter = LCD_START_LINE3;
+ else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2))
+ addressCounter = LCD_START_LINE4;
+ else
+ addressCounter = LCD_START_LINE1;
+# endif
+#endif
+ lcd_command((1 << LCD_DDRAM) + addressCounter);
+
+} /* lcd_newline */
+
+/*
+** PUBLIC FUNCTIONS
+*/
+
+/*************************************************************************
+Send LCD controller instruction command
+Input: instruction to send to LCD controller, see HD44780 data sheet
+Returns: none
+*************************************************************************/
+void lcd_command(uint8_t cmd) {
+ lcd_waitbusy();
+ lcd_write(cmd, 0);
+}
+
+/*************************************************************************
+Send data byte to LCD controller
+Input: data to send to LCD controller, see HD44780 data sheet
+Returns: none
+*************************************************************************/
+void lcd_data(uint8_t data) {
+ lcd_waitbusy();
+ lcd_write(data, 1);
+}
+
+/*************************************************************************
+Set cursor to specified position
+Input: x horizontal position (0: left most position)
+ y vertical position (0: first line)
+Returns: none
+*************************************************************************/
+void lcd_gotoxy(uint8_t x, uint8_t y) {
+#if LCD_LINES == 1
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
+#endif
+#if LCD_LINES == 2
+ if (y == 0)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
+ else
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
+#endif
+#if LCD_LINES == 4
+ if (y == 0)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
+ else if (y == 1)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
+ else if (y == 2)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE3 + x);
+ else /* y==3 */
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE4 + x);
+#endif
+
+} /* lcd_gotoxy */
+
+/*************************************************************************
+*************************************************************************/
+int lcd_getxy(void) { return lcd_waitbusy(); }
+
+/*************************************************************************
+Clear display and set cursor to home position
+*************************************************************************/
+void lcd_clrscr(void) { lcd_command(1 << LCD_CLR); }
+
+/*************************************************************************
+Set cursor to home position
+*************************************************************************/
+void lcd_home(void) { lcd_command(1 << LCD_HOME); }
+
+/*************************************************************************
+Display character at current cursor position
+Input: character to be displayed
+Returns: none
+*************************************************************************/
+void lcd_putc(char c) {
+ uint8_t pos;
+
+ pos = lcd_waitbusy(); // read busy-flag and address counter
+ if (c == '\n') {
+ lcd_newline(pos);
+ } else {
+#if LCD_WRAP_LINES == 1
+# if LCD_LINES == 1
+ if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
+ }
+# elif LCD_LINES == 2
+ if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
+ } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
+ }
+# elif LCD_LINES == 4
+ if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
+ } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE3, 0);
+ } else if (pos == LCD_START_LINE3 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE4, 0);
+ } else if (pos == LCD_START_LINE4 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
+ }
+# endif
+ lcd_waitbusy();
+#endif
+ lcd_write(c, 1);
+ }
+
+} /* lcd_putc */
+
+/*************************************************************************
+Display string without auto linefeed
+Input: string to be displayed
+Returns: none
+*************************************************************************/
+void lcd_puts(const char *s)
+/* print string on lcd (no auto linefeed) */
+{
+ register char c;
+
+ while ((c = *s++)) {
+ lcd_putc(c);
+ }
+
+} /* lcd_puts */
+
+/*************************************************************************
+Display string from program memory without auto linefeed
+Input: string from program memory be be displayed
+Returns: none
+*************************************************************************/
+void lcd_puts_p(const char *progmem_s)
+/* print string from program memory on lcd (no auto linefeed) */
+{
+ register char c;
+
+ while ((c = pgm_read_byte(progmem_s++))) {
+ lcd_putc(c);
+ }
+
+} /* lcd_puts_p */
+
+/*************************************************************************
+Initialize display and select type of cursor
+Input: dispAttr LCD_DISP_OFF display off
+ LCD_DISP_ON display on, cursor off
+ LCD_DISP_ON_CURSOR display on, cursor on
+ LCD_DISP_CURSOR_BLINK display on, cursor on flashing
+Returns: none
+*************************************************************************/
+void lcd_init(uint8_t dispAttr) {
+#if LCD_IO_MODE
+ /*
+ * Initialize LCD to 4 bit I/O mode
+ */
+
+ if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (&LCD_RS_PORT == &LCD_DATA0_PORT) && (&LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) && (LCD_RS_PIN == 4) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6)) {
+ /* configure all port bits as output (all LCD lines on same port) */
+ DDR(LCD_DATA0_PORT) |= 0x7F;
+ } else if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
+ /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */
+ DDR(LCD_DATA0_PORT) |= 0x0F;
+ DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
+ DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
+ DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
+ } else {
+ /* configure all port bits as output (LCD data and control lines on different ports */
+ DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
+ DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
+ DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
+ DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
+ DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
+ DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
+ DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
+ }
+ delay(LCD_DELAY_BOOTUP); /* wait 16ms or more after power-on */
+
+ /* initial write to lcd is 8bit */
+ LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // LCD_FUNCTION>>4;
+ LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // LCD_FUNCTION_8BIT>>4;
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT); /* delay, busy flag can't be checked here */
+
+ /* repeat last command */
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
+
+ /* repeat last command a third time */
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
+
+ /* now configure for 4bit mode */
+ LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT_4BIT); /* some displays need this additional delay */
+
+ /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */
+#else
+ /*
+ * Initialize LCD to 8 bit memory mapped mode
+ */
+
+ /* enable external SRAM (memory mapped lcd) and one wait state */
+ MCUCR = _BV(SRE) | _BV(SRW);
+
+ /* reset LCD */
+ delay(LCD_DELAY_BOOTUP); /* wait 16ms after power-on */
+ lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
+ delay(LCD_DELAY_INIT); /* wait 5ms */
+ lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
+ delay(LCD_DELAY_INIT_REP); /* wait 64us */
+ lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
+ delay(LCD_DELAY_INIT_REP); /* wait 64us */
+#endif
+
+#if KS0073_4LINES_MODE
+ /* Display with KS0073 controller requires special commands for enabling 4 line mode */
+ lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON);
+ lcd_command(KS0073_4LINES_MODE);
+ lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF);
+#else
+ lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */
+#endif
+ lcd_command(LCD_DISP_OFF); /* display off */
+ lcd_clrscr(); /* display clear */
+ lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
+ lcd_command(dispAttr); /* display/cursor control */
+
+} /* lcd_init */
diff --git a/platforms/avr/drivers/hd44780.h b/platforms/avr/drivers/hd44780.h
new file mode 100644
index 0000000000..08e60f8a44
--- /dev/null
+++ b/platforms/avr/drivers/hd44780.h
@@ -0,0 +1,348 @@
+/*************************************************************************
+ Title : C include file for the HD44780U LCD library (lcd.c)
+ Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
+ License: GNU General Public License Version 3
+ File: $Id: lcd.h,v 1.14.2.4 2015/01/20 17:16:07 peter Exp $
+ Software: AVR-GCC 4.x
+ Hardware: any AVR device, memory mapped mode only for AVR with
+ memory mapped interface (AT90S8515/ATmega8515/ATmega128)
+***************************************************************************/
+
+/**
+ @mainpage
+ Collection of libraries for AVR-GCC
+ @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
+ @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
+
+ @file
+ @defgroup pfleury_lcd LCD library <lcd.h>
+ @code #include <lcd.h> @endcode
+
+ @brief Basic routines for interfacing a HD44780U-based character LCD display
+
+ LCD character displays can be found in many devices, like espresso machines, laser printers.
+ The Hitachi HD44780 controller and its compatible controllers like Samsung KS0066U have become an industry standard for these types of displays.
+
+ This library allows easy interfacing with a HD44780 compatible display and can be
+ operated in memory mapped mode (LCD_IO_MODE defined as 0 in the include file lcd.h.) or in
+ 4-bit IO port mode (LCD_IO_MODE defined as 1). 8-bit IO port mode is not supported.
+
+ Memory mapped mode is compatible with old Kanda STK200 starter kit, but also supports
+ generation of R/W signal through A8 address line.
+
+ @see The chapter <a href=" http://homepage.hispeed.ch/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a>
+ on my home page, which shows example circuits how to connect an LCD to an AVR controller.
+
+ @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
+
+ @version 2.0
+
+ @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
+
+*/
+
+#pragma once
+
+#include <inttypes.h>
+#include <avr/pgmspace.h>
+
+#if (__GNUC__ * 100 + __GNUC_MINOR__) < 405
+# error "This library requires AVR-GCC 4.5 or later, update to newer AVR-GCC compiler !"
+#endif
+
+/**@{*/
+
+/*
+ * LCD and target specific definitions below can be defined in a separate include file with name lcd_definitions.h instead modifying this file
+ * by adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ */
+#ifdef _LCD_DEFINITIONS_FILE
+# include "lcd_definitions.h"
+#endif
+
+/**
+ * @name Definition for LCD controller type
+ * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.
+ */
+#ifndef LCD_CONTROLLER_KS0073
+# define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */
+#endif
+
+/**
+ * @name Definitions for Display Size
+ * Change these definitions to adapt setting to your display
+ *
+ * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
+ * adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile.
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ *
+ */
+#ifndef LCD_LINES
+# define LCD_LINES 2 /**< number of visible lines of the display */
+#endif
+#ifndef LCD_DISP_LENGTH
+# define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */
+#endif
+#ifndef LCD_LINE_LENGTH
+# define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */
+#endif
+#ifndef LCD_START_LINE1
+# define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */
+#endif
+#ifndef LCD_START_LINE2
+# define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */
+#endif
+#ifndef LCD_START_LINE3
+# define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */
+#endif
+#ifndef LCD_START_LINE4
+# define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */
+#endif
+#ifndef LCD_WRAP_LINES
+# define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */
+#endif
+
+/**
+ * @name Definitions for 4-bit IO mode
+ *
+ * The four LCD data lines and the three control lines RS, RW, E can be on the
+ * same port or on different ports.
+ * Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on
+ * different ports.
+ *
+ * Normally the four data lines should be mapped to bit 0..3 on one port, but it
+ * is possible to connect these data lines in different order or even on different
+ * ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions.
+ *
+ * Adjust these definitions to your target.\n
+ * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
+ * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ *
+ */
+#define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */
+
+#if LCD_IO_MODE
+
+# ifndef LCD_PORT
+# define LCD_PORT PORTA /**< port for the LCD lines */
+# endif
+# ifndef LCD_DATA0_PORT
+# define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */
+# endif
+# ifndef LCD_DATA1_PORT
+# define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */
+# endif
+# ifndef LCD_DATA2_PORT
+# define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */
+# endif
+# ifndef LCD_DATA3_PORT
+# define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */
+# endif
+# ifndef LCD_DATA0_PIN
+# define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */
+# endif
+# ifndef LCD_DATA1_PIN
+# define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */
+# endif
+# ifndef LCD_DATA2_PIN
+# define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */
+# endif
+# ifndef LCD_DATA3_PIN
+# define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */
+# endif
+# ifndef LCD_RS_PORT
+# define LCD_RS_PORT LCD_PORT /**< port for RS line */
+# endif
+# ifndef LCD_RS_PIN
+# define LCD_RS_PIN 3 /**< pin for RS line */
+# endif
+# ifndef LCD_RW_PORT
+# define LCD_RW_PORT LCD_PORT /**< port for RW line */
+# endif
+# ifndef LCD_RW_PIN
+# define LCD_RW_PIN 2 /**< pin for RW line */
+# endif
+# ifndef LCD_E_PORT
+# define LCD_E_PORT LCD_PORT /**< port for Enable line */
+# endif
+# ifndef LCD_E_PIN
+# define LCD_E_PIN 1 /**< pin for Enable line */
+# endif
+
+#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || defined(__AVR_ATmega8515__) || defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__)
+/*
+ * memory mapped mode is only supported when the device has an external data memory interface
+ */
+# define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */
+# define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */
+# define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */
+
+#else
+# error "external data memory interface not available for this device, use 4-bit IO port mode"
+
+#endif
+
+/**
+ * @name Definitions of delays
+ * Used to calculate delay timers.
+ * Adapt the F_CPU define in the Makefile to the clock frequency in Hz of your target
+ *
+ * These delay times can be adjusted, if some displays require different delays.\n
+ * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
+ * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ */
+#ifndef LCD_DELAY_BOOTUP
+# define LCD_DELAY_BOOTUP 16000 /**< delay in micro seconds after power-on */
+#endif
+#ifndef LCD_DELAY_INIT
+# define LCD_DELAY_INIT 5000 /**< delay in micro seconds after initialization command sent */
+#endif
+#ifndef LCD_DELAY_INIT_REP
+# define LCD_DELAY_INIT_REP 64 /**< delay in micro seconds after initialization command repeated */
+#endif
+#ifndef LCD_DELAY_INIT_4BIT
+# define LCD_DELAY_INIT_4BIT 64 /**< delay in micro seconds after setting 4-bit mode */
+#endif
+#ifndef LCD_DELAY_BUSY_FLAG
+# define LCD_DELAY_BUSY_FLAG 4 /**< time in micro seconds the address counter is updated after busy flag is cleared */
+#endif
+#ifndef LCD_DELAY_ENABLE_PULSE
+# define LCD_DELAY_ENABLE_PULSE 1 /**< enable signal pulse width in micro seconds */
+#endif
+
+/**
+ * @name Definitions for LCD command instructions
+ * The constants define the various LCD controller instructions which can be passed to the
+ * function lcd_command(), see HD44780 data sheet for a complete description.
+ */
+
+/* instruction register bit positions, see HD44780U data sheet */
+#define LCD_CLR 0 /* DB0: clear display */
+#define LCD_HOME 1 /* DB1: return to home position */
+#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */
+#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */
+#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */
+#define LCD_ON 3 /* DB3: turn lcd/cursor on */
+#define LCD_ON_DISPLAY 2 /* DB2: turn display on */
+#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */
+#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */
+#define LCD_MOVE 4 /* DB4: move cursor/display */
+#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */
+#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */
+#define LCD_FUNCTION 5 /* DB5: function set */
+#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */
+#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */
+#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */
+#define LCD_CGRAM 6 /* DB6: set CG RAM address */
+#define LCD_DDRAM 7 /* DB7: set DD RAM address */
+#define LCD_BUSY 7 /* DB7: LCD is busy */
+
+/* set entry mode: display shift on/off, dec/inc cursor move direction */
+#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */
+#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */
+#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */
+#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */
+
+/* display on/off, cursor on/off, blinking char at cursor position */
+#define LCD_DISP_OFF 0x08 /* display off */
+#define LCD_DISP_ON 0x0C /* display on, cursor off */
+#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */
+#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */
+#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */
+
+/* move cursor/shift display */
+#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */
+#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */
+#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */
+#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */
+
+/* function set: set interface data length and number of display lines */
+#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */
+#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */
+#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */
+#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */
+
+#define LCD_MODE_DEFAULT ((1 << LCD_ENTRY_MODE) | (1 << LCD_ENTRY_INC))
+
+/**
+ * @name Functions
+ */
+
+/**
+ @brief Initialize display and select type of cursor
+ @param dispAttr \b LCD_DISP_OFF display off\n
+ \b LCD_DISP_ON display on, cursor off\n
+ \b LCD_DISP_ON_CURSOR display on, cursor on\n
+ \b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing
+ @return none
+*/
+extern void lcd_init(uint8_t dispAttr);
+
+/**
+ @brief Clear display and set cursor to home position
+ @return none
+*/
+extern void lcd_clrscr(void);
+
+/**
+ @brief Set cursor to home position
+ @return none
+*/
+extern void lcd_home(void);
+
+/**
+ @brief Set cursor to specified position
+
+ @param x horizontal position\n (0: left most position)
+ @param y vertical position\n (0: first line)
+ @return none
+*/
+extern void lcd_gotoxy(uint8_t x, uint8_t y);
+
+/**
+ @brief Display character at current cursor position
+ @param c character to be displayed
+ @return none
+*/
+extern void lcd_putc(char c);
+
+/**
+ @brief Display string without auto linefeed
+ @param s string to be displayed
+ @return none
+*/
+extern void lcd_puts(const char *s);
+
+/**
+ @brief Display string from program memory without auto linefeed
+ @param progmem_s string from program memory be be displayed
+ @return none
+ @see lcd_puts_P
+*/
+extern void lcd_puts_p(const char *progmem_s);
+
+/**
+ @brief Send LCD controller instruction command
+ @param cmd instruction to send to LCD controller, see HD44780 data sheet
+ @return none
+*/
+extern void lcd_command(uint8_t cmd);
+
+/**
+ @brief Send data byte to LCD controller
+
+ Similar to lcd_putc(), but without interpreting LF
+ @param data byte to send to LCD controller, see HD44780 data sheet
+ @return none
+*/
+extern void lcd_data(uint8_t data);
+
+/**
+ @brief macros for automatically storing string constant in program memory
+*/
+#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
+
+/**@}*/
diff --git a/platforms/avr/drivers/i2c_master.c b/platforms/avr/drivers/i2c_master.c
new file mode 100644
index 0000000000..2773e00778
--- /dev/null
+++ b/platforms/avr/drivers/i2c_master.c
@@ -0,0 +1,241 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-master-lib
+ */
+
+#include <avr/io.h>
+#include <util/twi.h>
+
+#include "i2c_master.h"
+#include "timer.h"
+#include "wait.h"
+
+#ifndef F_SCL
+# define F_SCL 400000UL // SCL frequency
+#endif
+
+#ifndef I2C_START_RETRY_COUNT
+# define I2C_START_RETRY_COUNT 20
+#endif // I2C_START_RETRY_COUNT
+
+#define TWBR_val (((F_CPU / F_SCL) - 16) / 2)
+
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+
+void i2c_init(void) {
+ TWSR = 0; /* no prescaler */
+ TWBR = (uint8_t)TWBR_val;
+
+#ifdef __AVR_ATmega32A__
+ // set pull-up resistors on I2C bus pins
+ PORTC |= 0b11;
+
+ // enable TWI (two-wire interface)
+ TWCR |= (1 << TWEN);
+
+ // enable TWI interrupt and slave address ACK
+ TWCR |= (1 << TWIE);
+ TWCR |= (1 << TWEA);
+#endif
+}
+
+static i2c_status_t i2c_start_impl(uint8_t address, uint16_t timeout) {
+ // reset TWI control register
+ TWCR = 0;
+ // transmit START condition
+ TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // check if the start condition was successfully transmitted
+ if (((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)) {
+ return I2C_STATUS_ERROR;
+ }
+
+ // load slave address into data register
+ TWDR = address;
+ // start transmission of address
+ TWCR = (1 << TWINT) | (1 << TWEN);
+
+ timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // check if the device has acknowledged the READ / WRITE mode
+ uint8_t twst = TW_STATUS & 0xF8;
+ if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) {
+ return I2C_STATUS_ERROR;
+ }
+
+ return I2C_STATUS_SUCCESS;
+}
+
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout) {
+ // Retry i2c_start_impl a bunch times in case the remote side has interrupts disabled.
+ uint16_t timeout_timer = timer_read();
+ uint16_t time_slice = MAX(1, (timeout == (I2C_TIMEOUT_INFINITE)) ? 5 : (timeout / (I2C_START_RETRY_COUNT))); // if it's infinite, wait 1ms between attempts, otherwise split up the entire timeout into the number of retries
+ i2c_status_t status;
+ do {
+ status = i2c_start_impl(address, time_slice);
+ } while ((status < 0) && ((timeout == I2C_TIMEOUT_INFINITE) || (timer_elapsed(timeout_timer) < timeout)));
+ return status;
+}
+
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout) {
+ // load data into data register
+ TWDR = data;
+ // start transmission of data
+ TWCR = (1 << TWINT) | (1 << TWEN);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ if ((TW_STATUS & 0xF8) != TW_MT_DATA_ACK) {
+ return I2C_STATUS_ERROR;
+ }
+
+ return I2C_STATUS_SUCCESS;
+}
+
+int16_t i2c_read_ack(uint16_t timeout) {
+ // start TWI module and acknowledge data after reception
+ TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // return received data from TWDR
+ return TWDR;
+}
+
+int16_t i2c_read_nack(uint16_t timeout) {
+ // start receiving without acknowledging reception
+ TWCR = (1 << TWINT) | (1 << TWEN);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // return received data from TWDR
+ return TWDR;
+}
+
+i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+
+ for (uint16_t i = 0; i < length && status >= 0; i++) {
+ status = i2c_write(data[i], timeout);
+ }
+
+ i2c_stop();
+
+ return status;
+}
+
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(address | I2C_READ, timeout);
+
+ for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
+ status = i2c_read_ack(timeout);
+ if (status >= 0) {
+ data[i] = status;
+ }
+ }
+
+ if (status >= 0) {
+ status = i2c_read_nack(timeout);
+ if (status >= 0) {
+ data[(length - 1)] = status;
+ }
+ }
+
+ i2c_stop();
+
+ return (status < 0) ? status : I2C_STATUS_SUCCESS;
+}
+
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
+ if (status >= 0) {
+ status = i2c_write(regaddr, timeout);
+
+ for (uint16_t i = 0; i < length && status >= 0; i++) {
+ status = i2c_write(data[i], timeout);
+ }
+ }
+
+ i2c_stop();
+
+ return status;
+}
+
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(devaddr, timeout);
+ if (status < 0) {
+ goto error;
+ }
+
+ status = i2c_write(regaddr, timeout);
+ if (status < 0) {
+ goto error;
+ }
+
+ status = i2c_start(devaddr | 0x01, timeout);
+
+ for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
+ status = i2c_read_ack(timeout);
+ if (status >= 0) {
+ data[i] = status;
+ }
+ }
+
+ if (status >= 0) {
+ status = i2c_read_nack(timeout);
+ if (status >= 0) {
+ data[(length - 1)] = status;
+ }
+ }
+
+error:
+ i2c_stop();
+
+ return (status < 0) ? status : I2C_STATUS_SUCCESS;
+}
+
+void i2c_stop(void) {
+ // transmit STOP condition
+ TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
+}
diff --git a/platforms/avr/drivers/i2c_master.h b/platforms/avr/drivers/i2c_master.h
new file mode 100644
index 0000000000..e5af73364b
--- /dev/null
+++ b/platforms/avr/drivers/i2c_master.h
@@ -0,0 +1,43 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-master-lib
+ */
+
+#pragma once
+
+#define I2C_READ 0x01
+#define I2C_WRITE 0x00
+
+typedef int16_t i2c_status_t;
+
+#define I2C_STATUS_SUCCESS (0)
+#define I2C_STATUS_ERROR (-1)
+#define I2C_STATUS_TIMEOUT (-2)
+
+#define I2C_TIMEOUT_IMMEDIATE (0)
+#define I2C_TIMEOUT_INFINITE (0xFFFF)
+
+void i2c_init(void);
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout);
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout);
+int16_t i2c_read_ack(uint16_t timeout);
+int16_t i2c_read_nack(uint16_t timeout);
+i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
+void i2c_stop(void);
diff --git a/platforms/avr/drivers/i2c_slave.c b/platforms/avr/drivers/i2c_slave.c
new file mode 100644
index 0000000000..2907f164c0
--- /dev/null
+++ b/platforms/avr/drivers/i2c_slave.c
@@ -0,0 +1,111 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
+ */
+
+#include <stddef.h>
+#include <avr/io.h>
+#include <util/twi.h>
+#include <avr/interrupt.h>
+#include <stdbool.h>
+
+#include "i2c_slave.h"
+
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# include "transactions.h"
+
+static volatile bool is_callback_executor = false;
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+
+volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
+
+static volatile uint8_t buffer_address;
+static volatile bool slave_has_register_set = false;
+
+void i2c_slave_init(uint8_t address) {
+ // load address into TWI address register
+ TWAR = address;
+ // set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt
+ TWCR = (1 << TWIE) | (1 << TWEA) | (1 << TWINT) | (1 << TWEN);
+}
+
+void i2c_slave_stop(void) {
+ // clear acknowledge and enable bits
+ TWCR &= ~((1 << TWEA) | (1 << TWEN));
+}
+
+ISR(TWI_vect) {
+ uint8_t ack = 1;
+
+ switch (TW_STATUS) {
+ case TW_SR_SLA_ACK:
+ // The device is now a slave receiver
+ slave_has_register_set = false;
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ is_callback_executor = false;
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ break;
+
+ case TW_SR_DATA_ACK:
+ // This device is a slave receiver and has received data
+ // First byte is the location then the bytes will be writen in buffer with auto-increment
+ if (!slave_has_register_set) {
+ buffer_address = TWDR;
+
+ if (buffer_address >= I2C_SLAVE_REG_COUNT) { // address out of bounds dont ack
+ ack = 0;
+ buffer_address = 0;
+ }
+ slave_has_register_set = true; // address has been received now fill in buffer
+
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ // Work out if we're attempting to execute a callback
+ is_callback_executor = buffer_address == split_transaction_table[I2C_EXECUTE_CALLBACK].initiator2target_offset;
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ } else {
+ i2c_slave_reg[buffer_address] = TWDR;
+ buffer_address++;
+
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ // If we're intending to execute a transaction callback, do so, as we've just received the transaction ID
+ if (is_callback_executor) {
+ split_transaction_desc_t *trans = &split_transaction_table[split_shmem->transaction_id];
+ if (trans->slave_callback) {
+ trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
+ }
+ }
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ }
+ break;
+
+ case TW_ST_SLA_ACK:
+ case TW_ST_DATA_ACK:
+ // This device is a slave transmitter and master has requested data
+ TWDR = i2c_slave_reg[buffer_address];
+ buffer_address++;
+ break;
+
+ case TW_BUS_ERROR:
+ // We got an error, reset i2c
+ TWCR = 0;
+ default:
+ break;
+ }
+
+ // Reset i2c state machine to be ready for next interrupt
+ TWCR |= (1 << TWIE) | (1 << TWINT) | (ack << TWEA) | (1 << TWEN);
+}
diff --git a/platforms/avr/drivers/i2c_slave.h b/platforms/avr/drivers/i2c_slave.h
new file mode 100644
index 0000000000..a8647c9da3
--- /dev/null
+++ b/platforms/avr/drivers/i2c_slave.h
@@ -0,0 +1,41 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
+
+ Info: Inititate the library by giving the required address.
+ Read or write to the necessary buffer according to the opperation.
+ */
+
+#pragma once
+
+#ifndef I2C_SLAVE_REG_COUNT
+
+# if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# include "transport.h"
+# define I2C_SLAVE_REG_COUNT sizeof(split_shared_memory_t)
+# else // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# define I2C_SLAVE_REG_COUNT 30
+# endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+
+#endif // I2C_SLAVE_REG_COUNT
+
+_Static_assert(I2C_SLAVE_REG_COUNT < 256, "I2C target registers must be single byte");
+
+extern volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
+
+void i2c_slave_init(uint8_t address);
+void i2c_slave_stop(void);
diff --git a/platforms/avr/drivers/serial.c b/platforms/avr/drivers/serial.c
new file mode 100644
index 0000000000..9a7345a53d
--- /dev/null
+++ b/platforms/avr/drivers/serial.c
@@ -0,0 +1,529 @@
+/*
+ * WARNING: be careful changing this code, it is very timing dependent
+ *
+ * 2018-10-28 checked
+ * avr-gcc 4.9.2
+ * avr-gcc 5.4.0
+ * avr-gcc 7.3.0
+ */
+
+#ifndef F_CPU
+# define F_CPU 16000000
+#endif
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include "serial.h"
+
+#ifdef SOFT_SERIAL_PIN
+
+# if !(defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+# error serial.c is not supported for the currently selected MCU
+# endif
+// if using ATmega32U4/2, AT90USBxxx I2C, can not use PD0 and PD1 in soft serial.
+# if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# if defined(USE_AVR_I2C) && (SOFT_SERIAL_PIN == D0 || SOFT_SERIAL_PIN == D1)
+# error Using I2C, so can not use PD0, PD1
+# endif
+# endif
+// PD0..PD3, common config
+# if SOFT_SERIAL_PIN == D0
+# define EIMSK_BIT _BV(INT0)
+# define EICRx_BIT (~(_BV(ISC00) | _BV(ISC01)))
+# define SERIAL_PIN_INTERRUPT INT0_vect
+# define EICRx EICRA
+# elif SOFT_SERIAL_PIN == D1
+# define EIMSK_BIT _BV(INT1)
+# define EICRx_BIT (~(_BV(ISC10) | _BV(ISC11)))
+# define SERIAL_PIN_INTERRUPT INT1_vect
+# define EICRx EICRA
+# elif SOFT_SERIAL_PIN == D2
+# define EIMSK_BIT _BV(INT2)
+# define EICRx_BIT (~(_BV(ISC20) | _BV(ISC21)))
+# define SERIAL_PIN_INTERRUPT INT2_vect
+# define EICRx EICRA
+# elif SOFT_SERIAL_PIN == D3
+# define EIMSK_BIT _BV(INT3)
+# define EICRx_BIT (~(_BV(ISC30) | _BV(ISC31)))
+# define SERIAL_PIN_INTERRUPT INT3_vect
+# define EICRx EICRA
+# endif
+
+// ATmegaxxU2/AT90USB162 specific config
+# if defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_AT90USB162__)
+// PD4(INT5), PD6(INT6), PD7(INT7), PC7(INT4)
+# if SOFT_SERIAL_PIN == D4
+# define EIMSK_BIT _BV(INT5)
+# define EICRx_BIT (~(_BV(ISC50) | _BV(ISC51)))
+# define SERIAL_PIN_INTERRUPT INT5_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == D6
+# define EIMSK_BIT _BV(INT6)
+# define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+# define SERIAL_PIN_INTERRUPT INT6_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == D7
+# define EIMSK_BIT _BV(INT7)
+# define EICRx_BIT (~(_BV(ISC70) | _BV(ISC71)))
+# define SERIAL_PIN_INTERRUPT INT7_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == C7
+# define EIMSK_BIT _BV(INT4)
+# define EICRx_BIT (~(_BV(ISC40) | _BV(ISC41)))
+# define SERIAL_PIN_INTERRUPT INT4_vect
+# define EICRx EICRB
+# endif
+# endif
+
+// ATmegaxxU4 specific config
+# if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+// PE6(INT6)
+# if SOFT_SERIAL_PIN == E6
+# define EIMSK_BIT _BV(INT6)
+# define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+# define SERIAL_PIN_INTERRUPT INT6_vect
+# define EICRx EICRB
+# endif
+# endif
+
+// AT90USBxxx specific config
+# if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+// PE4..PE7(INT4..INT7)
+# if SOFT_SERIAL_PIN == E4
+# define EIMSK_BIT _BV(INT4)
+# define EICRx_BIT (~(_BV(ISC40) | _BV(ISC41)))
+# define SERIAL_PIN_INTERRUPT INT4_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == E5
+# define EIMSK_BIT _BV(INT5)
+# define EICRx_BIT (~(_BV(ISC50) | _BV(ISC51)))
+# define SERIAL_PIN_INTERRUPT INT5_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == E6
+# define EIMSK_BIT _BV(INT6)
+# define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+# define SERIAL_PIN_INTERRUPT INT6_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == E7
+# define EIMSK_BIT _BV(INT7)
+# define EICRx_BIT (~(_BV(ISC70) | _BV(ISC71)))
+# define SERIAL_PIN_INTERRUPT INT7_vect
+# define EICRx EICRB
+# endif
+# endif
+
+# ifndef SERIAL_PIN_INTERRUPT
+# error invalid SOFT_SERIAL_PIN value
+# endif
+
+# define setPinInputHigh(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
+# define setPinOutput(pin) (DDRx_ADDRESS(pin) |= _BV((pin)&0xF))
+# define writePinHigh(pin) (PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
+# define writePinLow(pin) (PORTx_ADDRESS(pin) &= ~_BV((pin)&0xF))
+# define readPin(pin) ((bool)(PINx_ADDRESS(pin) & _BV((pin)&0xF)))
+
+# define ALWAYS_INLINE __attribute__((always_inline))
+# define NO_INLINE __attribute__((noinline))
+# define _delay_sub_us(x) __builtin_avr_delay_cycles(x)
+
+// parity check
+# define ODD_PARITY 1
+# define EVEN_PARITY 0
+# define PARITY EVEN_PARITY
+
+# ifdef SERIAL_DELAY
+// custom setup in config.h
+// #define TID_SEND_ADJUST 2
+// #define SERIAL_DELAY 6 // micro sec
+// #define READ_WRITE_START_ADJUST 30 // cycles
+// #define READ_WRITE_WIDTH_ADJUST 8 // cycles
+# else
+// ============ Standard setups ============
+
+# ifndef SELECT_SOFT_SERIAL_SPEED
+# define SELECT_SOFT_SERIAL_SPEED 1
+// 0: about 189kbps (Experimental only)
+// 1: about 137kbps (default)
+// 2: about 75kbps
+// 3: about 39kbps
+// 4: about 26kbps
+// 5: about 20kbps
+# endif
+
+# if __GNUC__ < 6
+# define TID_SEND_ADJUST 14
+# else
+# define TID_SEND_ADJUST 2
+# endif
+
+# if SELECT_SOFT_SERIAL_SPEED == 0
+// Very High speed
+# define SERIAL_DELAY 4 // micro sec
+# if __GNUC__ < 6
+# define READ_WRITE_START_ADJUST 33 // cycles
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_START_ADJUST 34 // cycles
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 1
+// High speed
+# define SERIAL_DELAY 6 // micro sec
+# if __GNUC__ < 6
+# define READ_WRITE_START_ADJUST 30 // cycles
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_START_ADJUST 33 // cycles
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 2
+// Middle speed
+# define SERIAL_DELAY 12 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 3
+// Low speed
+# define SERIAL_DELAY 24 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 4
+// Very Low speed
+# define SERIAL_DELAY 36 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 5
+// Ultra Low speed
+# define SERIAL_DELAY 48 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# else
+# error invalid SELECT_SOFT_SERIAL_SPEED value
+# endif /* SELECT_SOFT_SERIAL_SPEED */
+# endif /* SERIAL_DELAY */
+
+# define SERIAL_DELAY_HALF1 (SERIAL_DELAY / 2)
+# define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY / 2)
+
+# define SLAVE_INT_WIDTH_US 1
+# define SLAVE_INT_ACK_WIDTH_UNIT 2
+# define SLAVE_INT_ACK_WIDTH 4
+
+inline static void serial_delay(void) ALWAYS_INLINE;
+inline static void serial_delay(void) { _delay_us(SERIAL_DELAY); }
+
+inline static void serial_delay_half1(void) ALWAYS_INLINE;
+inline static void serial_delay_half1(void) { _delay_us(SERIAL_DELAY_HALF1); }
+
+inline static void serial_delay_half2(void) ALWAYS_INLINE;
+inline static void serial_delay_half2(void) { _delay_us(SERIAL_DELAY_HALF2); }
+
+inline static void serial_output(void) ALWAYS_INLINE;
+inline static void serial_output(void) { setPinOutput(SOFT_SERIAL_PIN); }
+
+// make the serial pin an input with pull-up resistor
+inline static void serial_input_with_pullup(void) ALWAYS_INLINE;
+inline static void serial_input_with_pullup(void) { setPinInputHigh(SOFT_SERIAL_PIN); }
+
+inline static uint8_t serial_read_pin(void) ALWAYS_INLINE;
+inline static uint8_t serial_read_pin(void) { return !!readPin(SOFT_SERIAL_PIN); }
+
+inline static void serial_low(void) ALWAYS_INLINE;
+inline static void serial_low(void) { writePinLow(SOFT_SERIAL_PIN); }
+
+inline static void serial_high(void) ALWAYS_INLINE;
+inline static void serial_high(void) { writePinHigh(SOFT_SERIAL_PIN); }
+
+void soft_serial_initiator_init(void) {
+ serial_output();
+ serial_high();
+}
+
+void soft_serial_target_init(void) {
+ serial_input_with_pullup();
+
+ // Enable INT0-INT7
+ EIMSK |= EIMSK_BIT;
+ EICRx &= EICRx_BIT;
+}
+
+// Used by the sender to synchronize timing with the reciver.
+static void sync_recv(void) NO_INLINE;
+static void sync_recv(void) {
+ for (uint8_t i = 0; i < SERIAL_DELAY * 5 && serial_read_pin(); i++) {
+ }
+ // This shouldn't hang if the target disconnects because the
+ // serial line will float to high if the target does disconnect.
+ while (!serial_read_pin())
+ ;
+}
+
+// Used by the reciver to send a synchronization signal to the sender.
+static void sync_send(void) NO_INLINE;
+static void sync_send(void) {
+ serial_low();
+ serial_delay();
+ serial_high();
+}
+
+// Reads a byte from the serial line
+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) NO_INLINE;
+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
+ uint8_t byte, i, p, pb;
+
+ _delay_sub_us(READ_WRITE_START_ADJUST);
+ for (i = 0, byte = 0, p = PARITY; i < bit; i++) {
+ serial_delay_half1(); // read the middle of pulses
+ if (serial_read_pin()) {
+ byte = (byte << 1) | 1;
+ p ^= 1;
+ } else {
+ byte = (byte << 1) | 0;
+ p ^= 0;
+ }
+ _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
+ serial_delay_half2();
+ }
+ /* recive parity bit */
+ serial_delay_half1(); // read the middle of pulses
+ pb = serial_read_pin();
+ _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
+ serial_delay_half2();
+
+ *pterrcount += (p != pb) ? 1 : 0;
+
+ return byte;
+}
+
+// Sends a byte with MSB ordering
+void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE;
+void serial_write_chunk(uint8_t data, uint8_t bit) {
+ uint8_t b, p;
+ for (p = PARITY, b = 1 << (bit - 1); b; b >>= 1) {
+ if (data & b) {
+ serial_high();
+ p ^= 1;
+ } else {
+ serial_low();
+ p ^= 0;
+ }
+ serial_delay();
+ }
+ /* send parity bit */
+ if (p & 1) {
+ serial_high();
+ } else {
+ serial_low();
+ }
+ serial_delay();
+
+ serial_low(); // sync_send() / senc_recv() need raise edge
+}
+
+static void serial_send_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
+static void serial_send_packet(uint8_t *buffer, uint8_t size) {
+ for (uint8_t i = 0; i < size; ++i) {
+ uint8_t data;
+ data = buffer[i];
+ sync_send();
+ serial_write_chunk(data, 8);
+ }
+}
+
+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) {
+ uint8_t pecount = 0;
+ for (uint8_t i = 0; i < size; ++i) {
+ uint8_t data;
+ sync_recv();
+ data = serial_read_chunk(&pecount, 8);
+ buffer[i] = data;
+ }
+ return pecount == 0;
+}
+
+inline static void change_sender2reciver(void) {
+ sync_send(); // 0
+ serial_delay_half1(); // 1
+ serial_low(); // 2
+ serial_input_with_pullup(); // 2
+ serial_delay_half1(); // 3
+}
+
+inline static void change_reciver2sender(void) {
+ sync_recv(); // 0
+ serial_delay(); // 1
+ serial_low(); // 3
+ serial_output(); // 3
+ serial_delay_half1(); // 4
+}
+
+static inline uint8_t nibble_bits_count(uint8_t bits) {
+ bits = (bits & 0x5) + (bits >> 1 & 0x5);
+ bits = (bits & 0x3) + (bits >> 2 & 0x3);
+ return bits;
+}
+
+// interrupt handle to be used by the target device
+ISR(SERIAL_PIN_INTERRUPT) {
+ // recive transaction table index
+ uint8_t tid, bits;
+ uint8_t pecount = 0;
+ sync_recv();
+ bits = serial_read_chunk(&pecount, 8);
+ tid = bits >> 3;
+ bits = (bits & 7) != (nibble_bits_count(tid) & 7);
+ if (bits || pecount > 0 || tid > NUM_TOTAL_TRANSACTIONS) {
+ return;
+ }
+ serial_delay_half1();
+
+ serial_high(); // response step1 low->high
+ serial_output();
+ _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT * SLAVE_INT_ACK_WIDTH);
+ split_transaction_desc_t *trans = &split_transaction_table[tid];
+ serial_low(); // response step2 ack high->low
+
+ // If the transaction has a callback, we can execute it now
+ if (trans->slave_callback) {
+ trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
+ }
+
+ // target send phase
+ if (trans->target2initiator_buffer_size > 0) serial_send_packet((uint8_t *)split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size);
+ // target switch to input
+ change_sender2reciver();
+
+ // target recive phase
+ if (trans->initiator2target_buffer_size > 0) {
+ if (serial_recive_packet((uint8_t *)split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+ *trans->status = TRANSACTION_ACCEPTED;
+ } else {
+ *trans->status = TRANSACTION_DATA_ERROR;
+ }
+ } else {
+ *trans->status = TRANSACTION_ACCEPTED;
+ }
+
+ sync_recv(); // weit initiator output to high
+}
+
+/////////
+// start transaction by initiator
+//
+// int soft_serial_transaction(int sstd_index)
+//
+// Returns:
+// TRANSACTION_END
+// TRANSACTION_NO_RESPONSE
+// TRANSACTION_DATA_ERROR
+// this code is very time dependent, so we need to disable interrupts
+int soft_serial_transaction(int sstd_index) {
+ if (sstd_index > NUM_TOTAL_TRANSACTIONS) return TRANSACTION_TYPE_ERROR;
+ split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+
+ if (!trans->status) return TRANSACTION_TYPE_ERROR; // not registered
+
+ cli();
+
+ // signal to the target that we want to start a transaction
+ serial_output();
+ serial_low();
+ _delay_us(SLAVE_INT_WIDTH_US);
+
+ // send transaction table index
+ int tid = (sstd_index << 3) | (7 & nibble_bits_count(sstd_index));
+ sync_send();
+ _delay_sub_us(TID_SEND_ADJUST);
+ serial_write_chunk(tid, 8);
+ serial_delay_half1();
+
+ // wait for the target response (step1 low->high)
+ serial_input_with_pullup();
+ while (!serial_read_pin()) {
+ _delay_sub_us(2);
+ }
+
+ // check if the target is present (step2 high->low)
+ for (int i = 0; serial_read_pin(); i++) {
+ if (i > SLAVE_INT_ACK_WIDTH + 1) {
+ // slave failed to pull the line low, assume not present
+ serial_output();
+ serial_high();
+ *trans->status = TRANSACTION_NO_RESPONSE;
+ sei();
+ return TRANSACTION_NO_RESPONSE;
+ }
+ _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT);
+ }
+
+ // initiator recive phase
+ // if the target is present syncronize with it
+ if (trans->target2initiator_buffer_size > 0) {
+ if (!serial_recive_packet((uint8_t *)split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+ serial_output();
+ serial_high();
+ *trans->status = TRANSACTION_DATA_ERROR;
+ sei();
+ return TRANSACTION_DATA_ERROR;
+ }
+ }
+
+ // initiator switch to output
+ change_reciver2sender();
+
+ // initiator send phase
+ if (trans->initiator2target_buffer_size > 0) {
+ serial_send_packet((uint8_t *)split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size);
+ }
+
+ // always, release the line when not in use
+ sync_send();
+
+ *trans->status = TRANSACTION_END;
+ sei();
+ return TRANSACTION_END;
+}
+
+int soft_serial_get_and_clean_status(int sstd_index) {
+ split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+ cli();
+ int retval = *trans->status;
+ *trans->status = 0;
+ ;
+ sei();
+ return retval;
+}
+#endif
+
+// Helix serial.c history
+// 2018-1-29 fork from let's split and add PD2, modify sync_recv() (#2308, bceffdefc)
+// 2018-6-28 bug fix master to slave comm and speed up (#3255, 1038bbef4)
+// (adjusted with avr-gcc 4.9.2)
+// 2018-7-13 remove USE_SERIAL_PD2 macro (#3374, f30d6dd78)
+// (adjusted with avr-gcc 4.9.2)
+// 2018-8-11 add support multi-type transaction (#3608, feb5e4aae)
+// (adjusted with avr-gcc 4.9.2)
+// 2018-10-21 fix serial and RGB animation conflict (#4191, 4665e4fff)
+// (adjusted with avr-gcc 7.3.0)
+// 2018-10-28 re-adjust compiler depend value of delay (#4269, 8517f8a66)
+// (adjusted with avr-gcc 5.4.0, 7.3.0)
+// 2018-12-17 copy to TOP/quantum/split_common/ and remove backward compatibility code (#4669)
diff --git a/platforms/avr/drivers/spi_master.c b/platforms/avr/drivers/spi_master.c
new file mode 100644
index 0000000000..4e8fd3bcdf
--- /dev/null
+++ b/platforms/avr/drivers/spi_master.c
@@ -0,0 +1,180 @@
+/* Copyright 2020
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "spi_master.h"
+
+#include "timer.h"
+
+#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# define SPI_SCK_PIN B1
+# define SPI_MOSI_PIN B2
+# define SPI_MISO_PIN B3
+#elif defined(__AVR_ATmega32A__)
+# define SPI_SCK_PIN B7
+# define SPI_MOSI_PIN B5
+# define SPI_MISO_PIN B6
+#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+# define SPI_SCK_PIN B5
+# define SPI_MOSI_PIN B3
+# define SPI_MISO_PIN B4
+#endif
+
+#ifndef SPI_TIMEOUT
+# define SPI_TIMEOUT 100
+#endif
+
+static pin_t currentSlavePin = NO_PIN;
+static uint8_t currentSlaveConfig = 0;
+static bool currentSlave2X = false;
+
+void spi_init(void) {
+ writePinHigh(SPI_SS_PIN);
+ setPinOutput(SPI_SCK_PIN);
+ setPinOutput(SPI_MOSI_PIN);
+ setPinInput(SPI_MISO_PIN);
+
+ SPCR = (_BV(SPE) | _BV(MSTR));
+}
+
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
+ if (currentSlavePin != NO_PIN || slavePin == NO_PIN) {
+ return false;
+ }
+
+ currentSlaveConfig = 0;
+
+ if (lsbFirst) {
+ currentSlaveConfig |= _BV(DORD);
+ }
+
+ switch (mode) {
+ case 1:
+ currentSlaveConfig |= _BV(CPHA);
+ break;
+ case 2:
+ currentSlaveConfig |= _BV(CPOL);
+ break;
+ case 3:
+ currentSlaveConfig |= (_BV(CPOL) | _BV(CPHA));
+ break;
+ }
+
+ uint16_t roundedDivisor = 1;
+ while (roundedDivisor < divisor) {
+ roundedDivisor <<= 1;
+ }
+
+ switch (roundedDivisor) {
+ case 16:
+ currentSlaveConfig |= _BV(SPR0);
+ break;
+ case 64:
+ currentSlaveConfig |= _BV(SPR1);
+ break;
+ case 128:
+ currentSlaveConfig |= (_BV(SPR1) | _BV(SPR0));
+ break;
+ case 2:
+ currentSlave2X = true;
+ break;
+ case 8:
+ currentSlave2X = true;
+ currentSlaveConfig |= _BV(SPR0);
+ break;
+ case 32:
+ currentSlave2X = true;
+ currentSlaveConfig |= _BV(SPR1);
+ break;
+ }
+
+ SPCR |= currentSlaveConfig;
+ if (currentSlave2X) {
+ SPSR |= _BV(SPI2X);
+ }
+ currentSlavePin = slavePin;
+ setPinOutput(currentSlavePin);
+ writePinLow(currentSlavePin);
+
+ return true;
+}
+
+spi_status_t spi_write(uint8_t data) {
+ SPDR = data;
+
+ uint16_t timeout_timer = timer_read();
+ while (!(SPSR & _BV(SPIF))) {
+ if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) {
+ return SPI_STATUS_TIMEOUT;
+ }
+ }
+
+ return SPDR;
+}
+
+spi_status_t spi_read() {
+ SPDR = 0x00; // Dummy
+
+ uint16_t timeout_timer = timer_read();
+ while (!(SPSR & _BV(SPIF))) {
+ if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) {
+ return SPI_STATUS_TIMEOUT;
+ }
+ }
+
+ return SPDR;
+}
+
+spi_status_t spi_transmit(const uint8_t *data, uint16_t length) {
+ spi_status_t status;
+
+ for (uint16_t i = 0; i < length; i++) {
+ status = spi_write(data[i]);
+
+ if (status < 0) {
+ return status;
+ }
+ }
+
+ return SPI_STATUS_SUCCESS;
+}
+
+spi_status_t spi_receive(uint8_t *data, uint16_t length) {
+ spi_status_t status;
+
+ for (uint16_t i = 0; i < length; i++) {
+ status = spi_read();
+
+ if (status >= 0) {
+ data[i] = status;
+ } else {
+ return status;
+ }
+ }
+
+ return SPI_STATUS_SUCCESS;
+}
+
+void spi_stop(void) {
+ if (currentSlavePin != NO_PIN) {
+ setPinOutput(currentSlavePin);
+ writePinHigh(currentSlavePin);
+ currentSlavePin = NO_PIN;
+ SPSR &= ~(_BV(SPI2X));
+ SPCR &= ~(currentSlaveConfig);
+ currentSlaveConfig = 0;
+ currentSlave2X = false;
+ }
+}
diff --git a/platforms/avr/drivers/spi_master.h b/platforms/avr/drivers/spi_master.h
new file mode 100644
index 0000000000..8a30f47ae4
--- /dev/null
+++ b/platforms/avr/drivers/spi_master.h
@@ -0,0 +1,59 @@
+/* Copyright 2020
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+#include "gpio.h"
+
+typedef int16_t spi_status_t;
+
+// Hardware SS pin is defined in the header so that user code can refer to it
+#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# define SPI_SS_PIN B0
+#elif defined(__AVR_ATmega32A__)
+# define SPI_SS_PIN B4
+#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+# define SPI_SS_PIN B2
+#endif
+
+#define SPI_STATUS_SUCCESS (0)
+#define SPI_STATUS_ERROR (-1)
+#define SPI_STATUS_TIMEOUT (-2)
+
+#define SPI_TIMEOUT_IMMEDIATE (0)
+#define SPI_TIMEOUT_INFINITE (0xFFFF)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void spi_init(void);
+
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
+
+spi_status_t spi_write(uint8_t data);
+
+spi_status_t spi_read(void);
+
+spi_status_t spi_transmit(const uint8_t *data, uint16_t length);
+
+spi_status_t spi_receive(uint8_t *data, uint16_t length);
+
+void spi_stop(void);
+#ifdef __cplusplus
+}
+#endif
diff --git a/platforms/avr/drivers/ssd1306.c b/platforms/avr/drivers/ssd1306.c
new file mode 100644
index 0000000000..1a09a2bcb7
--- /dev/null
+++ b/platforms/avr/drivers/ssd1306.c
@@ -0,0 +1,319 @@
+#ifdef SSD1306OLED
+
+# include "ssd1306.h"
+# include "i2c.h"
+# include <string.h>
+# include "print.h"
+# include "glcdfont.c"
+# ifdef PROTOCOL_LUFA
+# include "lufa.h"
+# endif
+# include "sendchar.h"
+# include "timer.h"
+
+struct CharacterMatrix display;
+
+// Set this to 1 to help diagnose early startup problems
+// when testing power-on with ble. Turn it off otherwise,
+// as the latency of printing most of the debug info messes
+// with the matrix scan, causing keys to drop.
+# define DEBUG_TO_SCREEN 0
+
+// static uint16_t last_battery_update;
+// static uint32_t vbat;
+//#define BatteryUpdateInterval 10000 /* milliseconds */
+# define ScreenOffInterval 300000 /* milliseconds */
+# if DEBUG_TO_SCREEN
+static uint8_t displaying;
+# endif
+static uint16_t last_flush;
+
+// Write command sequence.
+// Returns true on success.
+static inline bool _send_cmd1(uint8_t cmd) {
+ bool res = false;
+
+ if (i2c_start_write(SSD1306_ADDRESS)) {
+ xprintf("failed to start write to %d\n", SSD1306_ADDRESS);
+ goto done;
+ }
+
+ if (i2c_master_write(0x0 /* command byte follows */)) {
+ print("failed to write control byte\n");
+
+ goto done;
+ }
+
+ if (i2c_master_write(cmd)) {
+ xprintf("failed to write command %d\n", cmd);
+ goto done;
+ }
+ res = true;
+done:
+ i2c_master_stop();
+ return res;
+}
+
+// Write 2-byte command sequence.
+// Returns true on success
+static inline bool _send_cmd2(uint8_t cmd, uint8_t opr) {
+ if (!_send_cmd1(cmd)) {
+ return false;
+ }
+ return _send_cmd1(opr);
+}
+
+// Write 3-byte command sequence.
+// Returns true on success
+static inline bool _send_cmd3(uint8_t cmd, uint8_t opr1, uint8_t opr2) {
+ if (!_send_cmd1(cmd)) {
+ return false;
+ }
+ if (!_send_cmd1(opr1)) {
+ return false;
+ }
+ return _send_cmd1(opr2);
+}
+
+# define send_cmd1(c) \
+ if (!_send_cmd1(c)) { \
+ goto done; \
+ }
+# define send_cmd2(c, o) \
+ if (!_send_cmd2(c, o)) { \
+ goto done; \
+ }
+# define send_cmd3(c, o1, o2) \
+ if (!_send_cmd3(c, o1, o2)) { \
+ goto done; \
+ }
+
+static void clear_display(void) {
+ matrix_clear(&display);
+
+ // Clear all of the display bits (there can be random noise
+ // in the RAM on startup)
+ send_cmd3(PageAddr, 0, (DisplayHeight / 8) - 1);
+ send_cmd3(ColumnAddr, 0, DisplayWidth - 1);
+
+ if (i2c_start_write(SSD1306_ADDRESS)) {
+ goto done;
+ }
+ if (i2c_master_write(0x40)) {
+ // Data mode
+ goto done;
+ }
+ for (uint8_t row = 0; row < MatrixRows; ++row) {
+ for (uint8_t col = 0; col < DisplayWidth; ++col) {
+ i2c_master_write(0);
+ }
+ }
+
+ display.dirty = false;
+
+done:
+ i2c_master_stop();
+}
+
+# if DEBUG_TO_SCREEN
+# undef sendchar
+static int8_t capture_sendchar(uint8_t c) {
+ sendchar(c);
+ iota_gfx_write_char(c);
+
+ if (!displaying) {
+ iota_gfx_flush();
+ }
+ return 0;
+}
+# endif
+
+bool iota_gfx_init(void) {
+ bool success = false;
+
+ send_cmd1(DisplayOff);
+ send_cmd2(SetDisplayClockDiv, 0x80);
+ send_cmd2(SetMultiPlex, DisplayHeight - 1);
+
+ send_cmd2(SetDisplayOffset, 0);
+
+ send_cmd1(SetStartLine | 0x0);
+ send_cmd2(SetChargePump, 0x14 /* Enable */);
+ send_cmd2(SetMemoryMode, 0 /* horizontal addressing */);
+
+# ifdef OLED_ROTATE180
+ // the following Flip the display orientation 180 degrees
+ send_cmd1(SegRemap);
+ send_cmd1(ComScanInc);
+# endif
+# ifndef OLED_ROTATE180
+ // Flips the display orientation 0 degrees
+ send_cmd1(SegRemap | 0x1);
+ send_cmd1(ComScanDec);
+# endif
+
+ send_cmd2(SetComPins, 0x2);
+ send_cmd2(SetContrast, 0x8f);
+ send_cmd2(SetPreCharge, 0xf1);
+ send_cmd2(SetVComDetect, 0x40);
+ send_cmd1(DisplayAllOnResume);
+ send_cmd1(NormalDisplay);
+ send_cmd1(DeActivateScroll);
+ send_cmd1(DisplayOn);
+
+ send_cmd2(SetContrast, 0); // Dim
+
+ clear_display();
+
+ success = true;
+
+ iota_gfx_flush();
+
+# if DEBUG_TO_SCREEN
+ print_set_sendchar(capture_sendchar);
+# endif
+
+done:
+ return success;
+}
+
+bool iota_gfx_off(void) {
+ bool success = false;
+
+ send_cmd1(DisplayOff);
+ success = true;
+
+done:
+ return success;
+}
+
+bool iota_gfx_on(void) {
+ bool success = false;
+
+ send_cmd1(DisplayOn);
+ success = true;
+
+done:
+ return success;
+}
+
+void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c) {
+ *matrix->cursor = c;
+ ++matrix->cursor;
+
+ if (matrix->cursor - &matrix->display[0][0] == sizeof(matrix->display)) {
+ // We went off the end; scroll the display upwards by one line
+ memmove(&matrix->display[0], &matrix->display[1], MatrixCols * (MatrixRows - 1));
+ matrix->cursor = &matrix->display[MatrixRows - 1][0];
+ memset(matrix->cursor, ' ', MatrixCols);
+ }
+}
+
+void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c) {
+ matrix->dirty = true;
+
+ if (c == '\n') {
+ // Clear to end of line from the cursor and then move to the
+ // start of the next line
+ uint8_t cursor_col = (matrix->cursor - &matrix->display[0][0]) % MatrixCols;
+
+ while (cursor_col++ < MatrixCols) {
+ matrix_write_char_inner(matrix, ' ');
+ }
+ return;
+ }
+
+ matrix_write_char_inner(matrix, c);
+}
+
+void iota_gfx_write_char(uint8_t c) { matrix_write_char(&display, c); }
+
+void matrix_write(struct CharacterMatrix *matrix, const char *data) {
+ const char *end = data + strlen(data);
+ while (data < end) {
+ matrix_write_char(matrix, *data);
+ ++data;
+ }
+}
+
+void iota_gfx_write(const char *data) { matrix_write(&display, data); }
+
+void matrix_write_P(struct CharacterMatrix *matrix, const char *data) {
+ while (true) {
+ uint8_t c = pgm_read_byte(data);
+ if (c == 0) {
+ return;
+ }
+ matrix_write_char(matrix, c);
+ ++data;
+ }
+}
+
+void iota_gfx_write_P(const char *data) { matrix_write_P(&display, data); }
+
+void matrix_clear(struct CharacterMatrix *matrix) {
+ memset(matrix->display, ' ', sizeof(matrix->display));
+ matrix->cursor = &matrix->display[0][0];
+ matrix->dirty = true;
+}
+
+void iota_gfx_clear_screen(void) { matrix_clear(&display); }
+
+void matrix_render(struct CharacterMatrix *matrix) {
+ last_flush = timer_read();
+ iota_gfx_on();
+# if DEBUG_TO_SCREEN
+ ++displaying;
+# endif
+
+ // Move to the home position
+ send_cmd3(PageAddr, 0, MatrixRows - 1);
+ send_cmd3(ColumnAddr, 0, (MatrixCols * FontWidth) - 1);
+
+ if (i2c_start_write(SSD1306_ADDRESS)) {
+ goto done;
+ }
+ if (i2c_master_write(0x40)) {
+ // Data mode
+ goto done;
+ }
+
+ for (uint8_t row = 0; row < MatrixRows; ++row) {
+ for (uint8_t col = 0; col < MatrixCols; ++col) {
+ const uint8_t *glyph = font + (matrix->display[row][col] * (FontWidth - 1));
+
+ for (uint8_t glyphCol = 0; glyphCol < FontWidth - 1; ++glyphCol) {
+ uint8_t colBits = pgm_read_byte(glyph + glyphCol);
+ i2c_master_write(colBits);
+ }
+
+ // 1 column of space between chars (it's not included in the glyph)
+ i2c_master_write(0);
+ }
+ }
+
+ matrix->dirty = false;
+
+done:
+ i2c_master_stop();
+# if DEBUG_TO_SCREEN
+ --displaying;
+# endif
+}
+
+void iota_gfx_flush(void) { matrix_render(&display); }
+
+__attribute__((weak)) void iota_gfx_task_user(void) {}
+
+void iota_gfx_task(void) {
+ iota_gfx_task_user();
+
+ if (display.dirty) {
+ iota_gfx_flush();
+ }
+
+ if (timer_elapsed(last_flush) > ScreenOffInterval) {
+ iota_gfx_off();
+ }
+}
+#endif
diff --git a/platforms/avr/drivers/ssd1306.h b/platforms/avr/drivers/ssd1306.h
new file mode 100644
index 0000000000..6eecdcfaa4
--- /dev/null
+++ b/platforms/avr/drivers/ssd1306.h
@@ -0,0 +1,87 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdio.h>
+#include "config.h"
+
+enum ssd1306_cmds {
+ DisplayOff = 0xAE,
+ DisplayOn = 0xAF,
+
+ SetContrast = 0x81,
+ DisplayAllOnResume = 0xA4,
+
+ DisplayAllOn = 0xA5,
+ NormalDisplay = 0xA6,
+ InvertDisplay = 0xA7,
+ SetDisplayOffset = 0xD3,
+ SetComPins = 0xda,
+ SetVComDetect = 0xdb,
+ SetDisplayClockDiv = 0xD5,
+ SetPreCharge = 0xd9,
+ SetMultiPlex = 0xa8,
+ SetLowColumn = 0x00,
+ SetHighColumn = 0x10,
+ SetStartLine = 0x40,
+
+ SetMemoryMode = 0x20,
+ ColumnAddr = 0x21,
+ PageAddr = 0x22,
+
+ ComScanInc = 0xc0,
+ ComScanDec = 0xc8,
+ SegRemap = 0xa0,
+ SetChargePump = 0x8d,
+ ExternalVcc = 0x01,
+ SwitchCapVcc = 0x02,
+
+ ActivateScroll = 0x2f,
+ DeActivateScroll = 0x2e,
+ SetVerticalScrollArea = 0xa3,
+ RightHorizontalScroll = 0x26,
+ LeftHorizontalScroll = 0x27,
+ VerticalAndRightHorizontalScroll = 0x29,
+ VerticalAndLeftHorizontalScroll = 0x2a,
+};
+
+// Controls the SSD1306 128x32 OLED display via i2c
+
+#ifndef SSD1306_ADDRESS
+# define SSD1306_ADDRESS 0x3C
+#endif
+
+#define DisplayHeight 32
+#define DisplayWidth 128
+
+#define FontHeight 8
+#define FontWidth 6
+
+#define MatrixRows (DisplayHeight / FontHeight)
+#define MatrixCols (DisplayWidth / FontWidth)
+
+struct CharacterMatrix {
+ uint8_t display[MatrixRows][MatrixCols];
+ uint8_t *cursor;
+ bool dirty;
+};
+
+extern struct CharacterMatrix display;
+
+bool iota_gfx_init(void);
+void iota_gfx_task(void);
+bool iota_gfx_off(void);
+bool iota_gfx_on(void);
+void iota_gfx_flush(void);
+void iota_gfx_write_char(uint8_t c);
+void iota_gfx_write(const char *data);
+void iota_gfx_write_P(const char *data);
+void iota_gfx_clear_screen(void);
+
+void iota_gfx_task_user(void);
+
+void matrix_clear(struct CharacterMatrix *matrix);
+void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c);
+void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c);
+void matrix_write(struct CharacterMatrix *matrix, const char *data);
+void matrix_write_P(struct CharacterMatrix *matrix, const char *data);
+void matrix_render(struct CharacterMatrix *matrix);
diff --git a/platforms/avr/drivers/uart.c b/platforms/avr/drivers/uart.c
new file mode 100644
index 0000000000..c6abcb6fe0
--- /dev/null
+++ b/platforms/avr/drivers/uart.c
@@ -0,0 +1,170 @@
+/* UART Example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2009 PJRC.COM, LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// Version 1.0: Initial Release
+// Version 1.1: Add support for Teensy 2.0, minor optimizations
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "uart.h"
+
+#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# define UDRn UDR1
+# define UBRRnL UBRR1L
+# define UCSRnA UCSR1A
+# define UCSRnB UCSR1B
+# define UCSRnC UCSR1C
+# define U2Xn U2X1
+# define RXENn RXEN1
+# define TXENn TXEN1
+# define RXCIEn RXCIE1
+# define UCSZn1 UCSZ11
+# define UCSZn0 UCSZ10
+# define UDRIEn UDRIE1
+# define USARTn_UDRE_vect USART1_UDRE_vect
+# define USARTn_RX_vect USART1_RX_vect
+#elif defined(__AVR_ATmega32A__)
+# define UDRn UDR
+# define UBRRnL UBRRL
+# define UCSRnA UCSRA
+# define UCSRnB UCSRB
+# define UCSRnC UCSRC
+# define U2Xn U2X
+# define RXENn RXEN
+# define TXENn TXEN
+# define RXCIEn RXCIE
+# define UCSZn1 UCSZ1
+# define UCSZn0 UCSZ0
+# define UDRIEn UDRIE
+# define USARTn_UDRE_vect USART_UDRE_vect
+# define USARTn_RX_vect USART_RX_vect
+#elif defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__)
+# define UDRn UDR0
+# define UBRRnL UBRR0L
+# define UCSRnA UCSR0A
+# define UCSRnB UCSR0B
+# define UCSRnC UCSR0C
+# define U2Xn U2X0
+# define RXENn RXEN0
+# define TXENn TXEN0
+# define RXCIEn RXCIE0
+# define UCSZn1 UCSZ01
+# define UCSZn0 UCSZ00
+# define UDRIEn UDRIE0
+# define USARTn_UDRE_vect USART_UDRE_vect
+# define USARTn_RX_vect USART_RX_vect
+#endif
+
+// These buffers may be any size from 2 to 256 bytes.
+#define RX_BUFFER_SIZE 64
+#define TX_BUFFER_SIZE 256
+
+static volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
+static volatile uint8_t tx_buffer_head;
+static volatile uint8_t tx_buffer_tail;
+static volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
+static volatile uint8_t rx_buffer_head;
+static volatile uint8_t rx_buffer_tail;
+
+// Initialize the UART
+void uart_init(uint32_t baud) {
+ cli();
+ UBRRnL = (F_CPU / 4 / baud - 1) / 2;
+ UCSRnA = (1 << U2Xn);
+ UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn);
+ UCSRnC = (1 << UCSZn1) | (1 << UCSZn0);
+ tx_buffer_head = tx_buffer_tail = 0;
+ rx_buffer_head = rx_buffer_tail = 0;
+ sei();
+}
+
+// Transmit a byte
+void uart_putchar(uint8_t c) {
+ uint8_t i;
+
+ i = tx_buffer_head + 1;
+ if (i >= TX_BUFFER_SIZE) i = 0;
+ // return immediately to avoid deadlock when interrupt is disabled(called from ISR)
+ if (tx_buffer_tail == i && (SREG & (1 << SREG_I)) == 0) return;
+ while (tx_buffer_tail == i)
+ ; // wait until space in buffer
+ // cli();
+ tx_buffer[i] = c;
+ tx_buffer_head = i;
+ UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn) | (1 << UDRIEn);
+ // sei();
+}
+
+// Receive a byte
+uint8_t uart_getchar(void) {
+ uint8_t c, i;
+
+ while (rx_buffer_head == rx_buffer_tail)
+ ; // wait for character
+ i = rx_buffer_tail + 1;
+ if (i >= RX_BUFFER_SIZE) i = 0;
+ c = rx_buffer[i];
+ rx_buffer_tail = i;
+ return c;
+}
+
+// Return whether the number of bytes waiting in the receive buffer is nonzero.
+// Call this before uart_getchar() to check if it will need
+// to wait for a byte to arrive.
+bool uart_available(void) {
+ uint8_t head, tail;
+
+ head = rx_buffer_head;
+ tail = rx_buffer_tail;
+ if (head >= tail) return (head - tail) > 0;
+ return (RX_BUFFER_SIZE + head - tail) > 0;
+}
+
+// Transmit Interrupt
+ISR(USARTn_UDRE_vect) {
+ uint8_t i;
+
+ if (tx_buffer_head == tx_buffer_tail) {
+ // buffer is empty, disable transmit interrupt
+ UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn);
+ } else {
+ i = tx_buffer_tail + 1;
+ if (i >= TX_BUFFER_SIZE) i = 0;
+ UDRn = tx_buffer[i];
+ tx_buffer_tail = i;
+ }
+}
+
+// Receive Interrupt
+ISR(USARTn_RX_vect) {
+ uint8_t c, i;
+
+ c = UDRn;
+ i = rx_buffer_head + 1;
+ if (i >= RX_BUFFER_SIZE) i = 0;
+ if (i != rx_buffer_tail) {
+ rx_buffer[i] = c;
+ rx_buffer_head = i;
+ }
+}
diff --git a/platforms/avr/drivers/uart.h b/platforms/avr/drivers/uart.h
new file mode 100644
index 0000000000..602eb3d8b0
--- /dev/null
+++ b/platforms/avr/drivers/uart.h
@@ -0,0 +1,35 @@
+/* UART Example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2009 PJRC.COM, LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+void uart_init(uint32_t baud);
+
+void uart_putchar(uint8_t c);
+
+uint8_t uart_getchar(void);
+
+bool uart_available(void);
diff --git a/platforms/avr/drivers/ws2812.c b/platforms/avr/drivers/ws2812.c
new file mode 100644
index 0000000000..77c492cd4c
--- /dev/null
+++ b/platforms/avr/drivers/ws2812.c
@@ -0,0 +1,176 @@
+/*
+ * light weight WS2812 lib V2.0b
+ *
+ * Controls WS2811/WS2812/WS2812B RGB-LEDs
+ * Author: Tim (cpldcpu@gmail.com)
+ *
+ * Jan 18th, 2014 v2.0b Initial Version
+ * Nov 29th, 2015 v2.3 Added SK6812RGBW support
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "ws2812.h"
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define pinmask(pin) (_BV((pin)&0xF))
+
+/*
+ * Forward declare internal functions
+ *
+ * The functions take a byte-array and send to the data output as WS2812 bitstream.
+ * The length is the number of bytes to send - three per LED.
+ */
+
+static inline void ws2812_sendarray_mask(uint8_t *data, uint16_t datlen, uint8_t masklo, uint8_t maskhi);
+
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds) {
+ DDRx_ADDRESS(RGB_DI_PIN) |= pinmask(RGB_DI_PIN);
+
+ uint8_t masklo = ~(pinmask(RGB_DI_PIN)) & PORTx_ADDRESS(RGB_DI_PIN);
+ uint8_t maskhi = pinmask(RGB_DI_PIN) | PORTx_ADDRESS(RGB_DI_PIN);
+
+ ws2812_sendarray_mask((uint8_t *)ledarray, number_of_leds * sizeof(LED_TYPE), masklo, maskhi);
+
+ _delay_us(WS2812_TRST_US);
+}
+
+/*
+ This routine writes an array of bytes with RGB values to the Dataout pin
+ using the fast 800kHz clockless WS2811/2812 protocol.
+*/
+
+// Timing in ns
+#define w_zeropulse 350
+#define w_onepulse 900
+#define w_totalperiod 1250
+
+// Fixed cycles used by the inner loop
+#define w_fixedlow 2
+#define w_fixedhigh 4
+#define w_fixedtotal 8
+
+// Insert NOPs to match the timing, if possible
+#define w_zerocycles (((F_CPU / 1000) * w_zeropulse) / 1000000)
+#define w_onecycles (((F_CPU / 1000) * w_onepulse + 500000) / 1000000)
+#define w_totalcycles (((F_CPU / 1000) * w_totalperiod + 500000) / 1000000)
+
+// w1_nops - nops between rising edge and falling edge - low
+#if w_zerocycles >= w_fixedlow
+# define w1_nops (w_zerocycles - w_fixedlow)
+#else
+# define w1_nops 0
+#endif
+
+// w2_nops - nops between fe low and fe high
+#if w_onecycles >= (w_fixedhigh + w1_nops)
+# define w2_nops (w_onecycles - w_fixedhigh - w1_nops)
+#else
+# define w2_nops 0
+#endif
+
+// w3_nops - nops to complete loop
+#if w_totalcycles >= (w_fixedtotal + w1_nops + w2_nops)
+# define w3_nops (w_totalcycles - w_fixedtotal - w1_nops - w2_nops)
+#else
+# define w3_nops 0
+#endif
+
+// The only critical timing parameter is the minimum pulse length of the "0"
+// Warn or throw error if this timing can not be met with current F_CPU settings.
+#define w_lowtime ((w1_nops + w_fixedlow) * 1000000) / (F_CPU / 1000)
+#if w_lowtime > 550
+# error "Light_ws2812: Sorry, the clock speed is too low. Did you set F_CPU correctly?"
+#elif w_lowtime > 450
+# warning "Light_ws2812: The timing is critical and may only work on WS2812B, not on WS2812(S)."
+# warning "Please consider a higher clockspeed, if possible"
+#endif
+
+#define w_nop1 "nop \n\t"
+#define w_nop2 "rjmp .+0 \n\t"
+#define w_nop4 w_nop2 w_nop2
+#define w_nop8 w_nop4 w_nop4
+#define w_nop16 w_nop8 w_nop8
+
+static inline void ws2812_sendarray_mask(uint8_t *data, uint16_t datlen, uint8_t masklo, uint8_t maskhi) {
+ uint8_t curbyte, ctr, sreg_prev;
+
+ sreg_prev = SREG;
+ cli();
+
+ while (datlen--) {
+ curbyte = (*data++);
+
+ asm volatile(" ldi %0,8 \n\t"
+ "loop%=: \n\t"
+ " out %2,%3 \n\t" // '1' [01] '0' [01] - re
+#if (w1_nops & 1)
+ w_nop1
+#endif
+#if (w1_nops & 2)
+ w_nop2
+#endif
+#if (w1_nops & 4)
+ w_nop4
+#endif
+#if (w1_nops & 8)
+ w_nop8
+#endif
+#if (w1_nops & 16)
+ w_nop16
+#endif
+ " sbrs %1,7 \n\t" // '1' [03] '0' [02]
+ " out %2,%4 \n\t" // '1' [--] '0' [03] - fe-low
+ " lsl %1 \n\t" // '1' [04] '0' [04]
+#if (w2_nops & 1)
+ w_nop1
+#endif
+#if (w2_nops & 2)
+ w_nop2
+#endif
+#if (w2_nops & 4)
+ w_nop4
+#endif
+#if (w2_nops & 8)
+ w_nop8
+#endif
+#if (w2_nops & 16)
+ w_nop16
+#endif
+ " out %2,%4 \n\t" // '1' [+1] '0' [+1] - fe-high
+#if (w3_nops & 1)
+ w_nop1
+#endif
+#if (w3_nops & 2)
+ w_nop2
+#endif
+#if (w3_nops & 4)
+ w_nop4
+#endif
+#if (w3_nops & 8)
+ w_nop8
+#endif
+#if (w3_nops & 16)
+ w_nop16
+#endif
+
+ " dec %0 \n\t" // '1' [+2] '0' [+2]
+ " brne loop%=\n\t" // '1' [+3] '0' [+4]
+ : "=&d"(ctr)
+ : "r"(curbyte), "I"(_SFR_IO_ADDR(PORTx_ADDRESS(RGB_DI_PIN))), "r"(maskhi), "r"(masklo));
+ }
+
+ SREG = sreg_prev;
+}
diff --git a/platforms/avr/drivers/ws2812_i2c.c b/platforms/avr/drivers/ws2812_i2c.c
new file mode 100644
index 0000000000..1c332e24b6
--- /dev/null
+++ b/platforms/avr/drivers/ws2812_i2c.c
@@ -0,0 +1,27 @@
+#include "ws2812.h"
+#include "i2c_master.h"
+
+#ifdef RGBW
+# error "RGBW not supported"
+#endif
+
+#ifndef WS2812_ADDRESS
+# define WS2812_ADDRESS 0xb0
+#endif
+
+#ifndef WS2812_TIMEOUT
+# define WS2812_TIMEOUT 100
+#endif
+
+void ws2812_init(void) { i2c_init(); }
+
+// Setleds for standard RGB
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t leds) {
+ static bool s_init = false;
+ if (!s_init) {
+ ws2812_init();
+ s_init = true;
+ }
+
+ i2c_transmit(WS2812_ADDRESS, (uint8_t *)ledarray, sizeof(LED_TYPE) * leds, WS2812_TIMEOUT);
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-21 21:36:25 +0000