232 lines
6.3 KiB
C
232 lines
6.3 KiB
C
/* Copyright 2021 @ Keychron (https://www.keychron.com)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "matrix.h"
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#include "atomic_util.h"
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#include <string.h>
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// Pin connected to DS of 74HC595
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#define DATA_PIN C15
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// Pin connected to SH_CP of 74HC595
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#define CLOCK_PIN A1
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// Pin connected to ST_CP of 74HC595
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#define LATCH_PIN A0
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#ifdef MATRIX_ROW_PINS
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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#endif // MATRIX_ROW_PINS
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#ifdef MATRIX_COL_PINS
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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#endif // MATRIX_COL_PINS
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#define ROWS_PER_HAND (MATRIX_ROWS)
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static inline void gpio_atomic_write_pin_low(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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gpio_write_pin_low(pin);
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}
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}
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static inline void gpio_atomic_write_pin_high(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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gpio_write_pin_high(pin);
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}
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}
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static inline void gpio_atomic_set_pin_output_low(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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gpio_set_pin_output(pin);
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gpio_write_pin_low(pin);
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}
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}
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static inline void gpio_atomic_set_pin_input_high(pin_t pin) {
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ATOMIC_BLOCK_FORCEON {
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gpio_set_pin_input_high(pin);
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}
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}
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static inline uint8_t readMatrixPin(pin_t pin) {
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if (pin != NO_PIN) {
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return gpio_read_pin(pin);
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} else {
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return 1;
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}
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}
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// At 3.6V input, three nops (37.5ns) should be enough for all signals
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#define small_delay() __asm__ __volatile__("nop;nop;nop;\n\t" ::: "memory")
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#define compiler_barrier() __asm__ __volatile__("" ::: "memory")
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static void shiftOut(uint8_t dataOut) {
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ATOMIC_BLOCK_FORCEON {
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for (uint8_t i = 0; i < 8; i++) {
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compiler_barrier();
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if (dataOut & 0x1) {
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gpio_write_pin_high(DATA_PIN);
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} else {
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gpio_write_pin_low(DATA_PIN);
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}
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dataOut = dataOut >> 1;
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compiler_barrier();
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gpio_write_pin_high(CLOCK_PIN);
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small_delay();
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gpio_write_pin_low(CLOCK_PIN);
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}
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compiler_barrier();
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gpio_write_pin_high(LATCH_PIN);
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small_delay();
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gpio_write_pin_low(LATCH_PIN);
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compiler_barrier();
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}
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}
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static void shiftout_single(uint8_t data) {
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ATOMIC_BLOCK_FORCEON {
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compiler_barrier();
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if (data & 0x1) {
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gpio_write_pin_high(DATA_PIN);
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} else {
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gpio_write_pin_low(DATA_PIN);
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}
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compiler_barrier();
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gpio_write_pin_high(CLOCK_PIN);
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small_delay();
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gpio_write_pin_low(CLOCK_PIN);
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compiler_barrier();
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gpio_write_pin_high(LATCH_PIN);
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small_delay();
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gpio_write_pin_low(LATCH_PIN);
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compiler_barrier();
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}
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}
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static bool select_col(uint8_t col) {
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pin_t pin = col_pins[col];
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if (pin != NO_PIN) {
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#ifdef MATRIX_UNSELECT_DRIVE_HIGH
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gpio_atomic_write_pin_low(pin);
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#else
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gpio_atomic_set_pin_output_low(pin);
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#endif
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return true;
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} else {
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if (col == 0) {
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shiftout_single(0x00);
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}
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return true;
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}
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return false;
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}
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static void unselect_col(uint8_t col) {
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pin_t pin = col_pins[col];
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if (pin != NO_PIN) {
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#ifdef MATRIX_UNSELECT_DRIVE_HIGH
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gpio_atomic_write_pin_high(pin);
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#else
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gpio_atomic_set_pin_input_high(pin);
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#endif
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} else {
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shiftout_single(0x01);
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}
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}
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static void unselect_cols(void) {
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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pin_t pin = col_pins[x];
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if (pin != NO_PIN) {
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#ifdef MATRIX_UNSELECT_DRIVE_HIGH
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gpio_atomic_set_pin_output_high(pin);
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#else
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gpio_atomic_set_pin_input_high(pin);
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#endif
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} else {
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if (x == 0)
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// unselect shift Register
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shiftOut(0xFF);
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}
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}
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}
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static void matrix_init_pins(void) {
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gpio_set_pin_output(DATA_PIN);
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gpio_set_pin_output(CLOCK_PIN);
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gpio_set_pin_output(LATCH_PIN);
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#ifdef MATRIX_UNSELECT_DRIVE_HIGH
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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if (col_pins[x] != NO_PIN) {
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gpio_set_pin_output(col_pins[x]);
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}
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}
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#endif
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unselect_cols();
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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if (row_pins[x] != NO_PIN) {
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gpio_atomic_set_pin_input_high(row_pins[x]);
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}
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}
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}
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static void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col, matrix_row_t row_shifter) {
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bool key_pressed = false;
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// Select col
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if (!select_col(current_col)) { // select col
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return; // skip NO_PIN col
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}
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matrix_output_select_delay();
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// For each row...
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for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
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// Check row pin state
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if (readMatrixPin(row_pins[row_index]) == 0) {
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// Pin LO, set col bit
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current_matrix[row_index] |= row_shifter;
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key_pressed = true;
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} else {
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// Pin HI, clear col bit
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current_matrix[row_index] &= ~row_shifter;
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}
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}
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// Unselect col
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unselect_col(current_col);
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matrix_output_unselect_delay(current_col, key_pressed); // wait for all Row signals to go HIGH
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}
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void matrix_init_custom(void) {
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// initialize key pins
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matrix_init_pins();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
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// Set col, read rows
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matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++, row_shifter <<= 1) {
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matrix_read_rows_on_col(curr_matrix, current_col, row_shifter);
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}
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bool changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
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if (changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
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return changed;
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}
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