From 7e0dde1f0009bc47430091736d7893148876b4ec Mon Sep 17 00:00:00 2001 From: somepin <79652090+somepin@users.noreply.github.com> Date: Fri, 25 Mar 2022 20:45:35 -0400 Subject: [Keyboard] Add YDKB Grape PCB (#16661) Co-authored-by: Drashna Jaelre --- keyboards/ydkb/grape/matrix.c | 96 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 keyboards/ydkb/grape/matrix.c (limited to 'keyboards/ydkb/grape/matrix.c') diff --git a/keyboards/ydkb/grape/matrix.c b/keyboards/ydkb/grape/matrix.c new file mode 100644 index 0000000000..700761fa44 --- /dev/null +++ b/keyboards/ydkb/grape/matrix.c @@ -0,0 +1,96 @@ +/* +Copyright 2022 somepin + +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 . +*/ + +#include +#include +#include "matrix.h" +#include "quantum.h" +#include "sn74x138.h" + +static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS; + +/* All rows use a 74HC138 3 to 8 bit demultiplexer. + * + * A2 A1 A0 + * D0 D1 D2 + * 0: 0 0 0 + * 1: 0 0 1 + * 2: 0 1 0 + * 3: 0 1 1 + * 4: 1 0 0 + * 5: 1 0 1 + * 6: 1 1 0 + */ +static void select_row(uint8_t row) { + sn74x138_set_addr(row); +} + +static void init_pins(void) { + for (uint8_t x = 0; x < MATRIX_COLS; x++) { + setPinInputHigh(col_pins[x]); + } +} + +static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) { + bool matrix_changed = false; + + // Store last value of row prior to reading + matrix_row_t last_row_value = current_matrix[current_row]; + + // Start with a clear matrix row + current_matrix[current_row] = 0; + + // Select row and wait for row selection to stabilize + select_row(current_row); + matrix_io_delay(); + + // For each col... + matrix_row_t row_shifter = MATRIX_ROW_SHIFTER; + for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { + + // Select the col pin to read (active low) + uint8_t pin_state = readPin(col_pins[col_index]); + + // Populate the matrix row with the state of the col pin + current_matrix[current_row] |= pin_state ? 0 : (row_shifter << col_index); + } + + // Determine if matrix changed state + if ((last_row_value != current_matrix[current_row]) && !(matrix_changed)) { + matrix_changed = true; + } + + return matrix_changed; +} + +void matrix_init_custom(void) { + // initialize demultiplexer + sn74x138_init(); + // initialize key pins + init_pins(); +} + +bool matrix_scan_custom(matrix_row_t current_matrix[]) { + bool changed = false; + + // Set row, read cols + for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) { + changed |= read_cols_on_row(current_matrix, current_row); + } + + return changed; +} -- cgit v1.2.3