/* 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; }