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/*
* 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
phex(~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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