128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
// Copyright 2022 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
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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 "debug.h"
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#include "util.h"
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#include "debounce.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_row(uint8_t row) {
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pin_t pin = row_pins[row];
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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_row(uint8_t row) {
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pin_t pin = row_pins[row];
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if (pin != NO_PIN) {
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gpio_atomic_set_pin_input_high(pin);
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}
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}
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static void unselect_rows(void) {
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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unselect_row(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_rows();
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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_atomic_set_pin_input_high(col_pins[x]);
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}
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}
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gpio_atomic_set_pin_input_high(F7);
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gpio_atomic_set_pin_input_high(F0);
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}
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void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Start with a clear matrix row
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matrix_row_t current_row_value = 0;
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if (!select_row(current_row)) { // Select row
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return; // skip NO_PIN row
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}
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matrix_output_select_delay();
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// For each col...
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matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++, row_shifter <<= 1) {
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uint8_t pin_state = 0;
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if (current_row == 3 && col_index == 0) {
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pin_state = !readMatrixPin(F7);
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} else if (current_row == 3 && col_index == 3) {
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pin_state = !readMatrixPin(F0);
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} else {
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pin_state = readMatrixPin(col_pins[col_index]);
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}
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// Populate the matrix row with the state of the col pin
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current_row_value |= pin_state ? 0 : row_shifter;
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}
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// Unselect row
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unselect_row(current_row);
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matrix_output_unselect_delay(current_row, current_row_value != 0); // wait for all Col signals to go HIGH
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// Update the matrix
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current_matrix[current_row] = current_row_value;
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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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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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matrix_read_cols_on_row(temp_matrix, current_row);
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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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