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// Copyright 2018-2022 Nick Brassel (@tzarc)
// SPDX-License-Identifier: GPL-2.0-or-later
#include "quantum.h"
#include <hal_pal.h>
#include "djinn.h"
#define GPIOB_BITMASK (1 << 13 | 1 << 14 | 1 << 15) // B13, B14, B15
#define GPIOB_OFFSET 13
#define GPIOB_COUNT 3
#define GPIOC_BITMASK (1 << 6 | 1 << 7 | 1 << 8) // C6, C7, C8
#define GPIOC_OFFSET 6
// Pin definitions
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
void matrix_wait_for_pin(pin_t pin, uint8_t target_state) {
rtcnt_t start = chSysGetRealtimeCounterX();
rtcnt_t end = start + 5000;
while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
if (readPin(pin) == target_state) {
break;
}
}
}
void matrix_wait_for_port(stm32_gpio_t *port, uint32_t target_bitmask) {
rtcnt_t start = chSysGetRealtimeCounterX();
rtcnt_t end = start + 5000;
while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
if ((palReadPort(port) & target_bitmask) == target_bitmask) {
break;
}
}
}
void matrix_init_custom(void) {
for (int i = 0; i < MATRIX_ROWS; ++i) {
setPinInputHigh(row_pins[i]);
}
for (int i = 0; i < MATRIX_COLS; ++i) {
setPinInputHigh(col_pins[i]);
}
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
static matrix_row_t temp_matrix[MATRIX_ROWS] = {0};
for (int current_col = 0; current_col < MATRIX_COLS; ++current_col) {
// Keep track of the pin we're working with
pin_t curr_col_pin = col_pins[current_col];
// Setup the output column pin
setPinOutput(curr_col_pin);
writePinLow(curr_col_pin);
matrix_wait_for_pin(curr_col_pin, 0);
// Read the row ports
uint32_t gpio_b = palReadPort(GPIOB);
uint32_t gpio_c = palReadPort(GPIOC);
// Unselect the row pin
setPinInputHigh(curr_col_pin);
// Construct the packed bitmask for the pins
uint32_t readback = ~(((gpio_b & GPIOB_BITMASK) >> GPIOB_OFFSET) | (((gpio_c & GPIOC_BITMASK) >> GPIOC_OFFSET) << GPIOB_COUNT));
// Inject values into the matrix
for (int i = 0; i < MATRIX_ROWS; ++i) {
if (readback & (1 << i)) {
temp_matrix[i] |= (1ul << current_col);
} else {
temp_matrix[i] &= ~(1ul << current_col);
}
}
// Wait for readback of the unselected column to go high
matrix_wait_for_pin(curr_col_pin, 1);
// Wait for readback of each port to go high -- unselecting the row would have been completed
matrix_wait_for_port(GPIOB, GPIOB_BITMASK);
matrix_wait_for_port(GPIOC, GPIOC_BITMASK);
}
// Check if we've changed, return the last-read data
bool changed = memcmp(current_matrix, temp_matrix, sizeof(temp_matrix)) != 0;
if (changed) {
memcpy(current_matrix, temp_matrix, sizeof(temp_matrix));
}
return changed;
}
void matrix_wait_for_interrupt(void) {
// Set up row/col pins and attach callback
for (int i = 0; i < ARRAY_SIZE(col_pins); ++i) {
setPinOutput(col_pins[i]);
writePinLow(col_pins[i]);
}
for (int i = 0; i < ARRAY_SIZE(row_pins); ++i) {
setPinInputHigh(row_pins[i]);
palEnableLineEvent(row_pins[i], PAL_EVENT_MODE_BOTH_EDGES);
}
// Wait for an interrupt
__WFI();
// Now that the interrupt has woken us up, reset all the row/col pins back to defaults
for (int i = 0; i < ARRAY_SIZE(row_pins); ++i) {
palDisableLineEvent(row_pins[i]);
writePinHigh(row_pins[i]);
setPinInputHigh(row_pins[i]);
}
for (int i = 0; i < ARRAY_SIZE(col_pins); ++i) {
writePinHigh(col_pins[i]);
setPinInputHigh(col_pins[i]);
}
}
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