diff options
Diffstat (limited to 'drivers/issi')
| -rw-r--r-- | drivers/issi/is31fl3218.c | 102 | ||||
| -rw-r--r-- | drivers/issi/is31fl3218.h | 24 |
2 files changed, 126 insertions, 0 deletions
diff --git a/drivers/issi/is31fl3218.c b/drivers/issi/is31fl3218.c new file mode 100644 index 0000000000..db44f72564 --- /dev/null +++ b/drivers/issi/is31fl3218.c @@ -0,0 +1,102 @@ +/* Copyright 2018 Jason Williams (Wilba) + * + * 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 "is31fl3218.h" +#include "i2c_master.h" + +// This is the full 8-bit address +#define ISSI_ADDRESS 0b10101000 + +// These are the register addresses +#define ISSI_REG_SHUTDOWN 0x00 +#define ISSI_REG_PWM 0x01 +#define ISSI_REG_CONTROL 0x13 +#define ISSI_REG_UPDATE 0x16 +#define ISSI_REG_RESET 0x17 + +// Default timeout if no I2C response +#define ISSI_TIMEOUT 100 + +// Reusable buffer for transfers +uint8_t g_twi_transfer_buffer[20]; + +// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining. +// If used as RGB LED driver, LEDs are assigned RGB,RGB,RGB,RGB,RGB,RGB +uint8_t g_pwm_buffer[18]; +bool g_pwm_buffer_update_required = false; + +void IS31FL3218_write_register( uint8_t reg, uint8_t data ) +{ + g_twi_transfer_buffer[0] = reg; + g_twi_transfer_buffer[1] = data; + i2c_transmit( ISSI_ADDRESS, g_twi_transfer_buffer, 2, ISSI_TIMEOUT); +} + +void IS31FL3218_write_pwm_buffer( uint8_t *pwm_buffer ) +{ + g_twi_transfer_buffer[0] = ISSI_REG_PWM; + for ( int i=0; i<18; i++ ) { + g_twi_transfer_buffer[1+i] = pwm_buffer[i]; + } + + i2c_transmit( ISSI_ADDRESS, g_twi_transfer_buffer, 19, ISSI_TIMEOUT); +} + +void IS31FL3218_init(void) +{ + // In case we ever want to reinitialize (?) + IS31FL3218_write_register( ISSI_REG_RESET, 0x00 ); + + // Turn off software shutdown + IS31FL3218_write_register( ISSI_REG_SHUTDOWN, 0x01 ); + + // Set all PWM values to zero + for ( uint8_t i = 0; i < 18; i++ ) { + IS31FL3218_write_register( ISSI_REG_PWM+i, 0x00 ); + } + + // Enable all channels + for ( uint8_t i = 0; i < 3; i++ ) { + IS31FL3218_write_register( ISSI_REG_CONTROL+i, 0b00111111 ); + } + + // Load PWM registers and LED Control register data + IS31FL3218_write_register( ISSI_REG_UPDATE, 0x01 ); +} + +void IS31FL3218_set_color( int index, uint8_t red, uint8_t green, uint8_t blue ) +{ + g_pwm_buffer[index * 3 + 0] = red; + g_pwm_buffer[index * 3 + 1] = green; + g_pwm_buffer[index * 3 + 2] = blue; + g_pwm_buffer_update_required = true; +} + +void IS31FL3218_set_color_all( uint8_t red, uint8_t green, uint8_t blue ) +{ + for ( int i = 0; i < 6; i++ ) { + IS31FL3218_set_color( i, red, green, blue ); + } +} + +void IS31FL3218_update_pwm_buffers(void) +{ + if ( g_pwm_buffer_update_required ) { + IS31FL3218_write_pwm_buffer( g_pwm_buffer ); + // Load PWM registers and LED Control register data + IS31FL3218_write_register( ISSI_REG_UPDATE, 0x01 ); + } + g_pwm_buffer_update_required = false; +} diff --git a/drivers/issi/is31fl3218.h b/drivers/issi/is31fl3218.h new file mode 100644 index 0000000000..2d24e51463 --- /dev/null +++ b/drivers/issi/is31fl3218.h @@ -0,0 +1,24 @@ +/* Copyright 2018 Jason Williams (Wilba) + * + * 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 <stdbool.h> + +void IS31FL3218_init(void); +void IS31FL3218_set_color( int index, uint8_t red, uint8_t green, uint8_t blue ); +void IS31FL3218_set_color_all( uint8_t red, uint8_t green, uint8_t blue ); +void IS31FL3218_update_pwm_buffers(void); |