mirror of
https://github.com/Keychron/qmk_firmware.git
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110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/*
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* Copyright 2020 Michael Schwingen
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "util.h"
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#include "matrix.h"
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#include "debounce.h"
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#include "spi_master.h"
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#include "print.h"
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#include "mschwingen.h"
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#define SPI_TIMEOUT 100
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/* Keyboard Matrix Assignments */
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static uint16_t row_bits[MATRIX_ROWS] = {
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0x4000, 0x8000, 0x2000, 0x1000, 0x0800, 0x0400, 0x0100, 0x0200,
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0x0040, 0x0080, 0x0020, 0x0010, 0x0008, 0x0004, 0x0001, 0x0002};
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static const pin_t col_pins[MATRIX_COLS] = {D1, D4, D7, B4, F7, F6, F5, F4};
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static void select_col(uint8_t col) {
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setPinOutput(col_pins[col]);
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writePinLow(col_pins[col]);
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}
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static void unselect_col(uint8_t col) { setPinInputHigh(col_pins[col]); }
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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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setPinInputHigh(col_pins[x]);
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}
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}
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
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uint16_t row_data;
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bool matrix_changed = false;
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// Select col and wait for col selecton to stabilize
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select_col(current_col);
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matrix_io_delay();
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writePinLow(SR_LOAD_PIN);
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writePinHigh(SR_LOAD_PIN);
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row_data = spi_read() << 8;
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row_data |= spi_read();
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dprintf("%02X ", ~row_data);
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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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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[row_index];
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matrix_row_t current_row_value = last_row_value;
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// Check row pin state
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if ((row_data & row_bits[row_index]) == 0) {
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// Pin LO, set col bit
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current_row_value |= (MATRIX_ROW_SHIFTER << current_col);
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} else {
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// Pin HI, clear col bit
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current_row_value &= ~(MATRIX_ROW_SHIFTER << current_col);
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}
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// Determine if the matrix changed state
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if ((last_row_value != current_row_value)) {
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matrix_changed = true;
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current_matrix[row_index] = current_row_value;
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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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return matrix_changed;
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}
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void matrix_init_custom(void) {
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unselect_cols();
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// set 4MHz SPI clock
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SPSR = 0;
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SPCR = _BV(SPE) | _BV(MSTR) | _BV(CPOL);
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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dprint("\r\nScan: ");
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// Set col, read rows
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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changed |= read_rows_on_col(current_matrix, current_col);
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}
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update_layer_leds();
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return changed;
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}
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