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- /* Copyright 2021 @ Keychron (https://www.keychron.com)
- *
- * 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 "matrix.h"
- #include "quantum.h"
-
- // Pin connected to DS of 74HC595
- #define DATA_PIN A7
- // Pin connected to SH_CP of 74HC595
- #define CLOCK_PIN B1
- // Pin connected to ST_CP of 74HC595
- #define LATCH_PIN B0
-
- #ifdef MATRIX_ROW_PINS
- static pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
- #endif // MATRIX_ROW_PINS
- #ifdef MATRIX_COL_PINS
- static pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
- #endif // MATRIX_COL_PINS
-
- #define ROWS_PER_HAND (MATRIX_ROWS)
-
- static inline void setPinOutput_writeLow(pin_t pin) {
- ATOMIC_BLOCK_FORCEON {
- setPinOutput(pin);
- writePinLow(pin);
- }
- }
-
- static inline void setPinOutput_writeHigh(pin_t pin) {
- ATOMIC_BLOCK_FORCEON {
- setPinOutput(pin);
- gpio_write_pin_high(pin);
- }
- }
-
- static inline void setPinInputHigh_atomic(pin_t pin) {
- ATOMIC_BLOCK_FORCEON {
- setPinInputHigh(pin);
- }
- }
-
- static inline uint8_t readMatrixPin(pin_t pin) {
- if (pin != NO_PIN) {
- return gpio_read_pin(pin);
- } else {
- return 1;
- }
- }
-
- static void shiftOut(uint8_t dataOut) {
- for (uint8_t i = 0; i < 8; i++) {
- if (dataOut & 0x1) {
- setPinOutput_writeHigh(DATA_PIN);
- } else {
- setPinOutput_writeLow(DATA_PIN);
- }
- dataOut = dataOut >> 1;
- setPinOutput_writeHigh(CLOCK_PIN);
- setPinOutput_writeLow(CLOCK_PIN);
- }
- setPinOutput_writeHigh(LATCH_PIN);
- setPinOutput_writeLow(LATCH_PIN);
- }
-
- static void shiftout_single(uint8_t data) {
- if (data & 0x1) {
- setPinOutput_writeHigh(DATA_PIN);
- } else {
- setPinOutput_writeLow(DATA_PIN);
- }
-
- setPinOutput_writeHigh(CLOCK_PIN);
- setPinOutput_writeLow(CLOCK_PIN);
-
- setPinOutput_writeHigh(LATCH_PIN);
- setPinOutput_writeLow(LATCH_PIN);
- }
-
- static bool select_col(uint8_t col) {
- pin_t pin = col_pins[col];
-
- if (pin != NO_PIN) {
- setPinOutput_writeLow(pin);
- return true;
- } else {
- if (col == 8) {
- shiftout_single(0x00);
- } else {
- shiftout_single(0x01);
- }
- return true;
- }
- return false;
- }
-
- static void unselect_col(uint8_t col) {
- pin_t pin = col_pins[col];
-
- if (pin != NO_PIN) {
- #ifdef MATRIX_UNSELECT_DRIVE_HIGH
- setPinOutput_writeHigh(pin);
- #else
- setPinInputHigh_atomic(pin);
- #endif
- } else {
- if (col == (MATRIX_COLS - 1))
- shiftout_single(0x01);
- }
- }
-
- static void unselect_cols(void) {
- // unselect column pins
- for (uint8_t x = 0; x < MATRIX_COLS; x++) {
- pin_t pin = col_pins[x];
-
- if (pin != NO_PIN) {
- #ifdef MATRIX_UNSELECT_DRIVE_HIGH
- setPinOutput_writeHigh(pin);
- #else
- setPinInputHigh_atomic(pin);
- #endif
- }
- if (x == (MATRIX_COLS - 1))
- // unselect Shift Register
- shiftOut(0xFF);
- }
- }
-
- static void matrix_init_pins(void) {
- unselect_cols();
- for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
- if (row_pins[x] != NO_PIN) {
- setPinInputHigh_atomic(row_pins[x]);
- }
- }
- }
-
- static void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col, matrix_row_t row_shifter) {
- bool key_pressed = false;
-
- // Select col
- if (!select_col(current_col)) { // select col
- return; // skip NO_PIN col
- }
- matrix_output_select_delay();
-
- // For each row...
- for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
- // Check row pin state
- if (readMatrixPin(row_pins[row_index]) == 0) {
- // Pin LO, set col bit
- current_matrix[row_index] |= row_shifter;
- key_pressed = true;
- } else {
- // Pin HI, clear col bit
- current_matrix[row_index] &= ~row_shifter;
- }
- }
-
- // Unselect col
- unselect_col(current_col);
- matrix_output_unselect_delay(current_col, key_pressed); // wait for all Row signals to go HIGH
- }
-
- void matrix_init_custom(void) {
- // initialize key pins
- matrix_init_pins();
- }
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
-
- // Set col, read rows
- matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
- for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++, row_shifter <<= 1) {
- matrix_read_rows_on_col(curr_matrix, current_col, row_shifter);
- }
-
- bool changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
- if (changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
-
- return changed;
- }
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