mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-22 16:37:58 +06:00
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
|
|
Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
|
|
|
|
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 "matrix.h"
|
|
#include "quantum.h"
|
|
#include "sn74x138.h"
|
|
|
|
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
|
|
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
|
|
|
|
/* Columns 6 and 9-15 use a 74HC138 3-to-8 demultiplexer.
|
|
* D4 is the enable pin, must be set high to use it.
|
|
*
|
|
* 0: F7
|
|
* 1: F5
|
|
* 2: F6
|
|
* 3: F1
|
|
* 4: F4
|
|
* 5: F0
|
|
*
|
|
* A2 A1 A0
|
|
* D0 D1 D2
|
|
* 6: 1 1 1
|
|
*
|
|
* 7: D5
|
|
* 8: D3
|
|
*
|
|
* 9: 1 1 0
|
|
* 10: 1 0 1
|
|
* 11: 1 0 0
|
|
* 12: 0 1 1
|
|
* 13: 0 1 0
|
|
* 14: 0 0 1
|
|
* 15: 0 0 0
|
|
*/
|
|
static void select_col(uint8_t col) {
|
|
if (col_pins[col] != NO_PIN) {
|
|
writePinLow(col_pins[col]);
|
|
} else {
|
|
sn74x138_set_addr((col == 6) ? 7 : 15 - col);
|
|
sn74x138_set_enabled(true);
|
|
}
|
|
}
|
|
|
|
static void unselect_col(uint8_t col) {
|
|
if (col_pins[col] != NO_PIN) {
|
|
setPinOutput(col_pins[col]);
|
|
writePinHigh(col_pins[col]);
|
|
} else {
|
|
sn74x138_set_enabled(false);
|
|
}
|
|
}
|
|
|
|
static void unselect_cols(void) {
|
|
// Native
|
|
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
|
|
if (col_pins[x] != NO_PIN) {
|
|
setPinOutput(col_pins[x]);
|
|
writePinHigh(col_pins[x]);
|
|
}
|
|
}
|
|
|
|
// Demultiplexer
|
|
sn74x138_set_enabled(false);
|
|
}
|
|
|
|
static void init_pins(void) {
|
|
unselect_cols();
|
|
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
|
|
setPinInputHigh(row_pins[x]);
|
|
}
|
|
}
|
|
|
|
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
|
|
bool matrix_changed = false;
|
|
|
|
// Select col and wait for col selection to stabilize
|
|
select_col(current_col);
|
|
matrix_io_delay();
|
|
|
|
// 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];
|
|
|
|
// Check row pin state
|
|
if (readPin(row_pins[row_index]) == 0) {
|
|
// Pin LO, set col bit
|
|
current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
|
|
} else {
|
|
// Pin HI, clear col bit
|
|
current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col);
|
|
}
|
|
|
|
// Determine if the matrix changed state
|
|
if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) {
|
|
matrix_changed = true;
|
|
}
|
|
}
|
|
|
|
// Unselect col
|
|
unselect_col(current_col);
|
|
|
|
return matrix_changed;
|
|
}
|
|
|
|
void matrix_init_custom(void) {
|
|
// initialize demultiplexer
|
|
sn74x138_init();
|
|
// initialize key pins
|
|
init_pins();
|
|
}
|
|
|
|
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
|
|
bool changed = false;
|
|
|
|
// 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);
|
|
}
|
|
|
|
return changed;
|
|
}
|