/* 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; } }