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+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
+Copyright 2015 ZSA Technology Labs Inc (@zsa)
+Copyright 2020 Christopher Courtney <drashna@live.com> (@drashna)
+Copyright 2021 Gary Kong <kongkm88@gmail.com> (@garykong)
+
+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/>.
+*/
+
+
+/*
+ * scan matrix
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include "wait.h"
+#include "action_layer.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+#include "debounce.h"
+#include "bajjak.h"
+
+
+/*
+ * This constant define not debouncing time in msecs, assuming eager_pr.
+ *
+ * On BAJJAK matrix scan rate is relatively low, because of slow I2C.
+ * Now it's only 317 scans/second, or about 3.15 msec/scan.
+ * According to Cherry specs, debouncing time is 5 msec.
+ *
+ * However, some switches seem to have higher debouncing requirements, or
+ * something else might be wrong. (Also, the scan speed has improved since
+ * that comment was written.)
+ */
+
+/* matrix state(1:on, 0:off) */
+extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
+extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
+
+static matrix_row_t read_cols(uint8_t row);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+static uint8_t mcp23018_reset_loop;
+
+void matrix_init_custom(void) {
+ // initialize row and col
+
+ mcp23018_status = init_mcp23018();
+
+ unselect_rows();
+ init_cols();
+}
+
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_raw_matrix_row(uint8_t index) {
+ matrix_row_t temp = read_cols(index);
+ if (raw_matrix[index] != temp) {
+ raw_matrix[index] = temp;
+ return true;
+ }
+ return false;
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+ if (mcp23018_status) { // if there was an error
+ if (++mcp23018_reset_loop == 0) {
+ print("trying to reset mcp23018\n");
+ mcp23018_status = init_mcp23018();
+ if (mcp23018_status) {
+ print("left side not responding\n");
+ } else {
+ print("left side attached\n");
+ bajjak_blink_all_leds();
+ }
+ }
+ }
+
+#ifdef LEFT_LEDS
+ mcp23018_status = bajjak_left_leds_update();
+#endif // LEFT_LEDS
+ bool changed = false;
+ for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+ // select rows from left and right hands
+ uint8_t left_index = i;
+ uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+ select_row(left_index);
+ select_row(right_index);
+
+ changed |= store_raw_matrix_row(left_index);
+ changed |= store_raw_matrix_row(right_index);
+
+ unselect_rows();
+ }
+
+ return changed;
+}
+
+/* Column pin configuration
+ *
+ * Teensy
+ * col: 0 1 2 3 4 5
+ * pin: F0 F1 F4 F5 F6 F7
+ *
+ * MCP23018
+ * col: 0 1 2 3 4 5
+ * pin: B5 B4 B3 B2 B1 B0
+ */
+static void init_cols(void) {
+ // init on mcp23018
+ // not needed, already done as part of init_mcp23018()
+
+ // init on teensy
+ setPinInputHigh(F0);
+ setPinInputHigh(F1);
+ setPinInputHigh(F4);
+ setPinInputHigh(F5);
+ setPinInputHigh(F6);
+ setPinInputHigh(F7);
+ setPinInputHigh(D7);
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+ if (row < 7) {
+ if (mcp23018_status) { // if there was an error
+ return 0;
+ } else {
+ uint8_t data = 0;
+ // reading GPIOB (column port) since in mcp23018's sequential mode
+ // it is addressed directly after writing to GPIOA in select_row()
+ mcp23018_status = i2c_start(I2C_ADDR_READ, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_read_nack(BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status < 0) goto out;
+ data = ~((uint8_t)mcp23018_status);
+ mcp23018_status = I2C_STATUS_SUCCESS;
+ out:
+ i2c_stop();
+ return data;
+ }
+ } else {
+ /* read from teensy
+ * bitmask is 0b11110011, but we want those all
+ * in the lower six bits.
+ * we'll return 1s for the top two, but that's harmless.
+ */
+
+ return ~( (PINF & 0x03) | ((PINF & 0xF0) >> 2) | ((PIND & 0x80) >> 1) );
+ }
+}
+
+/* Row pin configuration
+ *
+ * Teensy
+ * row: 7 8 9 10 11 12 13
+ * pin: B0 B1 B2 B3 D2 D3 C6
+ *
+ * MCP23018
+ * row: 0 1 2 3 4 5 6
+ * pin: A0 A1 A2 A3 A4 A5 A6
+ */
+static void unselect_rows(void) {
+ // no need to unselect on mcp23018, because the select step sets all
+ // the other row bits high, and it's not changing to a different
+ // direction
+
+ // unselect on teensy
+ setPinInput(B0);
+ setPinInput(B1);
+ setPinInput(B2);
+ setPinInput(B3);
+ setPinInput(D2);
+ setPinInput(D3);
+ setPinInput(C6);
+}
+
+static void select_row(uint8_t row) {
+ if (row < 7) {
+ // select on mcp23018
+ if (!mcp23018_status) {
+ // set active row low : 0
+ // set other rows hi-Z : 1
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPIOA, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0xFF & ~(1 << row), BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ out:
+ i2c_stop();
+ }
+ } else {
+ // select on teensy
+ // Output low(DDR:1, PORT:0) to select
+ switch (row) {
+ case 7:
+ setPinOutput(B0);
+ writePinLow(B0);
+ break;
+ case 8:
+ setPinOutput(B1);
+ writePinLow(B1);
+ break;
+ case 9:
+ setPinOutput(B2);
+ writePinLow(B2);
+ break;
+ case 10:
+ setPinOutput(B3);
+ writePinLow(B3);
+ break;
+ case 11:
+ setPinOutput(D2);
+ writePinLow(D2);
+ break;
+ case 12:
+ setPinOutput(D3);
+ writePinLow(D3);
+ break;
+ case 13:
+ setPinOutput(C6);
+ writePinLow(C6);
+ break;
+ }
+ }
+}
+
+// DO NOT REMOVE
+// Needed for proper wake/sleep
+void matrix_power_up(void) {
+ mcp23018_status = init_mcp23018();
+
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ }
+
+}
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