130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
// Copyright 2023 Cameron Varley (@RustedAperture)
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* scan matrix
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*/
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#include "matrix.h"
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#include <string.h>
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#include "atomic_util.h"
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#include "wait.h"
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#include "print.h"
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#include "debug.h"
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/* matrix state(1:on, 0:off) */
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extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
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extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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#define MATRIX_ROW_SHIFTER ((matrix_row_t)1)
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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_output_high(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_high(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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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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gpio_atomic_set_pin_output_low(pin);
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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_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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}
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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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unselect_col(x);
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}
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}
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__attribute__((weak)) void matrix_init_custom(void) {
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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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gpio_atomic_set_pin_input_high(B8);
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}
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__attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col, matrix_row_t row_shifter) { // Start with a clear matrix row
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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 < MATRIX_ROWS; row_index++) {
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// Check row pin state
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if (current_col == 3 && row_index == 2 && readMatrixPin(B8) == 1) {
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current_matrix[row_index] |= row_shifter;
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key_pressed = !readMatrixPin(B8);
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} else 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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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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matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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matrix_read_rows_on_col(temp_matrix, current_col, row_shifter);
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}
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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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return changed;
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}
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