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/* 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;
}
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