95 lines
No EOL
2.6 KiB
C
95 lines
No EOL
2.6 KiB
C
/* Copyright 2021 Jay Greco
|
|
*
|
|
* 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 "quantum.h"
|
|
|
|
#define COL_SHIFTER ((uint32_t)1)
|
|
|
|
// Column pins
|
|
static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
|
|
static const uint8_t col_pins[MATRIX_MUX_COLS] = MATRIX_COL_MUX_PINS;
|
|
|
|
// Internal functions
|
|
|
|
static void init_pins(void) {
|
|
// Set cols to outputs, low
|
|
for (uint8_t pin = 0; pin < MATRIX_MUX_COLS; pin++) {
|
|
setPinOutput(col_pins[pin]);
|
|
}
|
|
|
|
// Unselect cols
|
|
for (uint8_t bit = 0; bit < MATRIX_MUX_COLS; bit++) {
|
|
writePinLow(col_pins[bit]);
|
|
}
|
|
|
|
// Set rows to input, pullup
|
|
for (uint8_t pin = 0; pin < MATRIX_ROWS; pin++) {
|
|
setPinInputHigh(row_pins[pin]);
|
|
}
|
|
}
|
|
|
|
static void select_col(uint8_t col)
|
|
{
|
|
for (uint8_t bit = 0; bit < MATRIX_MUX_COLS; bit++) {
|
|
uint8_t state = (col & (0b1 << bit)) >> bit;
|
|
writePin(col_pins[bit], state);
|
|
}
|
|
}
|
|
|
|
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
|
|
{
|
|
bool matrix_changed = false;
|
|
select_col(current_col);
|
|
wait_us(5);
|
|
|
|
// Read each row sequentially
|
|
for(uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++)
|
|
{
|
|
matrix_row_t last_row_value = current_matrix[row_index];
|
|
|
|
if (!readPin(row_pins[row_index]))
|
|
{
|
|
current_matrix[row_index] |= (COL_SHIFTER << current_col);
|
|
}
|
|
else
|
|
{
|
|
current_matrix[row_index] &= ~(COL_SHIFTER << current_col);
|
|
}
|
|
|
|
if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
|
|
{
|
|
matrix_changed = true;
|
|
}
|
|
}
|
|
|
|
return matrix_changed;
|
|
}
|
|
|
|
// Matrix scan functions
|
|
|
|
void matrix_init_custom(void) {
|
|
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 (uint8_t)changed;
|
|
} |