- /*
- * Copyright 2020 Michael Schwingen
-
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <stdint.h>
- #include <stdbool.h>
- #include "util.h"
- #include "matrix.h"
- #include "debounce.h"
- #include "quantum.h"
- #include "spi_master.h"
- #include "print.h"
- #include "modelm.h"
-
- #define DEBUG 0
-
- #define SPI_TIMEOUT 100
-
- /* Keyboard Matrix Assignments */
- static uint16_t row_bits[MATRIX_ROWS] = {
- 0x4000, 0x8000, 0x2000, 0x1000, 0x0800, 0x0400, 0x0100, 0x0200,
- 0x0040, 0x0080, 0x0020, 0x0010, 0x0008, 0x0004, 0x0001, 0x0002};
-
- static const pin_t col_pins[MATRIX_COLS] = {D1, D4, D7, B4, F7, F6, F5, F4};
-
- static void select_col(uint8_t col) {
- setPinOutput(col_pins[col]);
- writePinLow(col_pins[col]);
- }
-
- static void unselect_col(uint8_t col) { setPinInputHigh(col_pins[col]); }
-
- static void unselect_cols(void) {
- for (uint8_t x = 0; x < MATRIX_COLS; x++) {
- setPinInputHigh(col_pins[x]);
- }
- }
-
- static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
- uint16_t row_data;
- bool matrix_changed = false;
-
- // Select col and wait for col selecton to stabilize
- select_col(current_col);
- matrix_io_delay();
-
- writePinLow(SR_LOAD_PIN);
- writePinHigh(SR_LOAD_PIN);
-
- row_data = spi_read() << 8;
- row_data |= spi_read();
-
- #if DEBUG
- print_hex8(~row_data);
- uprint(" ");
- #endif
- // For each row...
- for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
- // Store last value of row prior to reading
- matrix_row_t last_row_value = current_matrix[row_index];
- matrix_row_t current_row_value = last_row_value;
-
- // Check row pin state
- if ((row_data & row_bits[row_index]) == 0) {
- // Pin LO, set col bit
- current_row_value |= (MATRIX_ROW_SHIFTER << current_col);
- } else {
- // Pin HI, clear col bit
- current_row_value &= ~(MATRIX_ROW_SHIFTER << current_col);
- }
-
- // Determine if the matrix changed state
- if ((last_row_value != current_row_value)) {
- matrix_changed = true;
- current_matrix[row_index] = current_row_value;
- }
- }
-
- // Unselect col
- unselect_col(current_col);
-
- return matrix_changed;
- }
-
- void matrix_init_custom(void) {
- unselect_cols();
-
- // set 4MHz SPI clock
- SPSR = 0;
- SPCR = _BV(SPE) | _BV(MSTR) | _BV(CPOL);
- }
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- bool changed = false;
-
- #if DEBUG
- uprint("\r\nScan: ");
- #endif
- // Set col, read rows
- for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
- changed |= read_rows_on_col(current_matrix, current_col);
- }
- update_layer_leds();
- return changed;
- }
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