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/*
Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
Copyright 2019 Evy Dekkers
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 "matrix.h"
#include "gpio.h"
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
/* Cols 0 - 16
* These columns use two 74HC138 3 to 8 bit demultiplexer. B4, C7 is the enable pin, must be set high (1) to use it.
*
* col / pin: PA0 PA1 PA2 PB4 PC7 PC2 PC3 PC5
* 0: 0 ── 0 ── 0 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 1: 0 ── 0 ── 1 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 2: 0 ── 1 ── 0 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 3: 0 ── 1 ── 1 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 4: 1 ── 0 ── 0 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 5: 1 ── 0 ── 1 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 6: 1 ── 1 ── 0 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 7: 1 ── 1 ── 1 1 ── 0 0 0 0
* ────────────────────────────────────────────
* 8: 1 ── 1 ── 1 0 ── 1 0 0 0
* ────────────────────────────────────────────
* 9: 0 ── 0 ── 0 0 ── 1 0 0 0
* ────────────────────────────────────────────
*10: 0 ── 0 ── 1 0 ── 1 0 0 0
* ────────────────────────────────────────────
*11: 0 ── 1 ── 0 0 ── 1 0 0 0
* ────────────────────────────────────────────
*12: 0 ── 1 ── 1 0 ── 1 0 0 0
* ────────────────────────────────────────────
*13: 1 ── 0 ── 0 0 ── 1 0 0 0
* ────────────────────────────────────────────
*14: 1 ── 0 ── 1 0 ── 1 0 0 0
* ────────────────────────────────────────────
*15: 1 ── 1 ── 0 0 ── 1 0 0 0
* ────────────────────────────────────────────
*16: 0 ── 0 ── 0 0 ── 0 1 0 0
* ────────────────────────────────────────────
*17: 0 ── 0 ── 0 0 ── 0 0 1 0
* ────────────────────────────────────────────
*18: 0 ── 0 ── 0 0 ── 0 0 0 1
*
*/
static void select_col(uint8_t col) {
switch (col) {
case 0:
writePinLow(A0);
writePinLow(A1);
writePinLow(A2);
writePinHigh(B4);
break;
case 1:
writePinLow(A0);
writePinLow(A1);
writePinHigh(A2);
writePinHigh(B4);
break;
case 2:
writePinLow(A0);
writePinHigh(A1);
writePinLow(A2);
writePinHigh(B4);
break;
case 3:
writePinLow(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinHigh(B4);
break;
case 4:
writePinHigh(A0);
writePinLow(A1);
writePinLow(A2);
writePinHigh(B4);
break;
case 5:
writePinHigh(A0);
writePinLow(A1);
writePinHigh(A2);
writePinHigh(B4);
break;
case 6:
writePinHigh(A0);
writePinHigh(A1);
writePinLow(A2);
writePinHigh(B4);
break;
case 7:
writePinHigh(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinHigh(B4);
break;
case 8:
writePinHigh(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinHigh(C7);
break;
case 9:
writePinLow(A0);
writePinLow(A1);
writePinLow(A2);
writePinHigh(C7);
break;
case 10:
writePinLow(A0);
writePinLow(A1);
writePinHigh(A2);
writePinHigh(C7);
break;
case 11:
writePinLow(A0);
writePinHigh(A1);
writePinLow(A2);
writePinHigh(C7);
break;
case 12:
writePinLow(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinHigh(C7);
break;
case 13:
writePinHigh(A0);
writePinLow(A1);
writePinLow(A2);
writePinHigh(C7);
break;
case 14:
writePinHigh(A0);
writePinLow(A1);
writePinHigh(A2);
writePinHigh(C7);
break;
case 15:
writePinHigh(A0);
writePinHigh(A1);
writePinLow(A2);
writePinHigh(C7);
break;
case 16:
writePinLow(C2);
break;
case 17:
writePinLow(C3);
break;
case 18:
writePinLow(C5);
break;
}
}
static void unselect_col(uint8_t col) {
switch (col) {
case 0:
writePinHigh(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinLow(B4);
break;
case 1:
writePinHigh(A0);
writePinHigh(A1);
writePinLow(A2);
writePinLow(B4);
break;
case 2:
writePinHigh(A0);
writePinLow(A1);
writePinHigh(A2);
writePinLow(B4);
break;
case 3:
writePinHigh(A0);
writePinLow(A1);
writePinLow(A2);
writePinLow(B4);
break;
case 4:
writePinLow(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinLow(B4);
break;
case 5:
writePinLow(A0);
writePinHigh(A1);
writePinLow(A2);
writePinLow(B4);
break;
case 6:
writePinLow(A0);
writePinLow(A1);
writePinHigh(A2);
writePinLow(B4);
break;
case 7:
writePinLow(A0);
writePinLow(A1);
writePinLow(A2);
writePinLow(B4);
break;
case 8:
writePinLow(A0);
writePinLow(A1);
writePinLow(A2);
writePinLow(C7);
break;
case 9:
writePinHigh(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinLow(C7);
break;
case 10:
writePinHigh(A0);
writePinHigh(A1);
writePinLow(A2);
writePinLow(C7);
break;
case 11:
writePinHigh(A0);
writePinLow(A1);
writePinHigh(A2);
writePinLow(C7);
break;
case 12:
writePinHigh(A0);
writePinLow(A1);
writePinLow(A2);
writePinLow(C7);
break;
case 13:
writePinLow(A0);
writePinHigh(A1);
writePinHigh(A2);
writePinLow(C7);
break;
case 14:
writePinLow(A0);
writePinHigh(A1);
writePinLow(A2);
writePinLow(C7);
break;
case 15:
writePinLow(A0);
writePinLow(A1);
writePinHigh(A2);
writePinLow(C7);
break;
case 16:
writePinHigh(C2);
break;
case 17:
writePinHigh(C3);
break;
case 18:
writePinHigh(C5);
break;
}
}
static void unselect_cols(void) {
//Native
writePinHigh(C2);
writePinHigh(C3);
writePinHigh(C5);
//Demultiplexer
writePinLow(B4);
writePinLow(C7);
writePinHigh(A0);
writePinHigh(A1);
writePinHigh(A2);
}
static void init_pins(void) {
unselect_cols();
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
setPinInputHigh(row_pins[x]);
}
setPinOutput(A0);
setPinOutput(A1);
setPinOutput(A2);
setPinOutput(B4);
setPinOutput(C7);
setPinOutput(C2);
setPinOutput(C3);
setPinOutput(C5);
}
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 selecton 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 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;
}
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