diff options
Diffstat (limited to 'keyboards/al1/matrix.c')
| -rw-r--r-- | keyboards/al1/matrix.c | 152 |
1 files changed, 81 insertions, 71 deletions
diff --git a/keyboards/al1/matrix.c b/keyboards/al1/matrix.c index 1407cbc089..e3d7971f1c 100644 --- a/keyboards/al1/matrix.c +++ b/keyboards/al1/matrix.c @@ -1,91 +1,101 @@ -#include "matrix.h" +/* Copyright 2022 + * + * 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" +#include "sn74x154.h" -static uint8_t read_rows(void) { - return (readPin(C7) ? 0 : 1) | - (readPin(B1) ? 0 : 2) | - (readPin(B2) ? 0 : 4) | - (readPin(C6) ? 0 : 8) | - (readPin(B4) ? 0 : 16) | - (readPin(B5) ? 0 : 32); -} +static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS; +/* All columns use a 74HC154 4-to-16 demultiplexer. + * D3 is the enable pin, must be set high to use it. + * + * A3 A2 A1 A0 + * D7 D6 D5 D4 + * 0: 0 0 0 0 + * 1: 0 0 0 1 + * 2: 0 0 1 0 + * 3: 0 0 1 1 + * 4: 0 1 0 0 + * 5: 0 1 0 1 + * 6: 0 1 1 0 + * 7: 0 1 1 1 + * 8: 1 0 0 0 + * 9: 1 0 0 1 + * 10: 1 0 1 0 + * 11: 1 0 1 1 + * 12: 1 1 0 0 + * 13: 1 1 0 1 + * 14: 1 1 1 0 + * 15: 1 1 1 1 + */ static void select_col(uint8_t col) { - writePinLow(D3); - - writePin(D4, (col & 1)); - writePin(D5, (col & 2)); - writePin(D6, (col & 4)); - writePin(D7, (col & 8)); + sn74x154_set_addr(col); } -static void unselect_cols(void) { - writePinHigh(D3); +static void init_pins(void) { + for (uint8_t x = 0; x < MATRIX_ROWS; x++) { + setPinInputHigh(row_pins[x]); + } } -void matrix_init_custom(void) { - /* 74HC154 col pin configuration - * pin: D3 D7 D6 D5 D4 - * row: off 0 x x x x - * 0 1 0 0 0 0 - * 1 1 0 0 0 1 - * 2 1 0 0 1 0 - * 3 1 0 0 1 1 - * 4 1 0 1 0 0 - * 5 1 0 1 0 1 - * 6 1 0 1 1 0 - * 7 1 0 1 1 1 - * 8 1 1 0 0 0 - * 9 1 1 0 0 1 - * 10 1 1 0 1 0 - * 11 1 1 0 1 1 - * 12 1 1 1 0 0 - * 13 1 1 1 0 1 - * 14 1 1 1 1 0 - * 15 1 1 1 1 1 - */ - setPinOutput(D3); - writePinHigh(D3); +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 seleciton to stabilize + select_col(current_col); + matrix_io_delay(); - setPinOutput(D4); - setPinOutput(D5); - setPinOutput(D6); - setPinOutput(D7); + // 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); + } - /* Row pin configuration - * - * row: 0 1 2 3 4 5 - * pin: C7 B1 B2 C6 B4 B5 - * - */ - setPinInputHigh(C7); - setPinInputHigh(B1); - setPinInputHigh(B2); - setPinInputHigh(C6); - setPinInputHigh(B4); - setPinInputHigh(B5); + // Determine if the matrix changed state + if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) { + matrix_changed = true; + } + } + + return matrix_changed; +} + +void matrix_init_custom(void) { + // initialize demultiplexer + sn74x154_init(); + sn74x154_set_enabled(true); + // initialize key pins + init_pins(); } bool matrix_scan_custom(matrix_row_t current_matrix[]) { bool changed = false; - for (uint8_t col = 0; col < MATRIX_COLS; col++) { - select_col(col); - matrix_io_delay(); - uint8_t rows = read_rows(); - - for (uint8_t row = 0; row < MATRIX_ROWS; row++) { - bool prev_bit = current_matrix[row] & ((matrix_row_t)1 << col); - bool curr_bit = rows & (1 << row); - - if (prev_bit != curr_bit) { - current_matrix[row] ^= ((matrix_row_t)1 << col); - changed = true; - } - } - unselect_cols(); + // 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; |