118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
// Copyright 2023 David Hoelscher (@customMK)
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "matrix.h"
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#include <string.h>
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// Pin definitions
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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void matrix_wait_for_pin(pin_t pin, uint8_t target_state) {
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rtcnt_t start = chSysGetRealtimeCounterX();
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rtcnt_t end = start + 5000;
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while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
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if (readPin(pin) == target_state) {
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break;
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}
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}
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}
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void matrix_wait_for_port(stm32_gpio_t *port, uint32_t target_bitmask) {
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rtcnt_t start = chSysGetRealtimeCounterX();
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rtcnt_t end = start + 5000;
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while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
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if ((palReadPort(port) & target_bitmask) == target_bitmask) {
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break;
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}
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}
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}
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void shift_pulse_clock(void) {
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writePinHigh(COL_SHIFT_CLK_PIN);
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matrix_wait_for_pin(COL_SHIFT_CLK_PIN, 1);
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writePinLow(COL_SHIFT_CLK_PIN);
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}
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void matrix_init_custom(void) {
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//set all row pins as input with pullups
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for (int i = 0; i < MATRIX_ROWS; ++i) {
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writePinHigh(row_pins[i]);
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setPinInputHigh(row_pins[i]);
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}
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//set all column pins high in ROW2COL matrix
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setPinOutput(COL_SHIFT_IN_PIN);
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setPinOutput(COL_SHIFT_CLK_PIN);
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writePinHigh(COL_SHIFT_IN_PIN);
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matrix_wait_for_pin(COL_SHIFT_IN_PIN, 1);
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for (int i = 0; i < MATRIX_COLS; ++i) {
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shift_pulse_clock();
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}
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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static matrix_row_t temp_matrix[MATRIX_ROWS] = {0};
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writePinLow(COL_SHIFT_IN_PIN);
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matrix_wait_for_pin(COL_SHIFT_IN_PIN, 0);
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// Setup the output column pin
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shift_pulse_clock();
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writePinHigh(COL_SHIFT_IN_PIN);
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for (int current_col = 0; current_col < MATRIX_COLS; ++current_col) {
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// Read the column ports
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uint32_t gpio_a = palReadPort(GPIOA);
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uint32_t gpio_b = palReadPort(GPIOB);
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// row 0, pin A8
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int current_row = 0;
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if ((gpio_a & (1 << 8)) >> 8) {
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temp_matrix[current_row] &= ~(1ul << current_col);
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} else {
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temp_matrix[current_row] |= (1ul << current_col);
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}
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// row 1, pin A1
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current_row = 1;
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if ((gpio_a & (1 << 1)) >> 1) {
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temp_matrix[current_row] &= ~(1ul << current_col);
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} else {
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temp_matrix[current_row] |= (1ul << current_col);
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}
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// row 2, pin A2
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current_row = 2;
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if ((gpio_a & (1 << 2)) >> 2) {
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temp_matrix[current_row] &= ~(1ul << current_col);
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} else {
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temp_matrix[current_row] |= (1ul << current_col);
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}
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// row 3, pin B3
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current_row = 3;
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if ((gpio_b & (1 << 1)) >> 1) {
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temp_matrix[current_row] &= ~(1ul << current_col);
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} else {
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temp_matrix[current_row] |= (1ul << current_col);
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}
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// row 4, pin A7
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current_row = 4;
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if ((gpio_a & (1 << 7)) >> 7) {
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temp_matrix[current_row] &= ~(1ul << current_col);
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} else {
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temp_matrix[current_row] |= (1ul << current_col);
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}
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// Setup the output column pin
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shift_pulse_clock();
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}
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// Check if matrix has changed, return the last-read data
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bool changed = memcmp(current_matrix, temp_matrix, sizeof(temp_matrix)) != 0;
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if (changed) {
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memcpy(current_matrix, temp_matrix, sizeof(temp_matrix));
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}
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shift_pulse_clock();
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return changed;
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}
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