// 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]); } }