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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"
-
- 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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