118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
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Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "wait.h"
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#include "util.h"
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#include "matrix.h"
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// Encoder things
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#define ENC_SW F7
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static bool read_encoder_switches(matrix_row_t current_matrix[], uint8_t current_row);
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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/* matrix state(1:on, 0:off) */
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extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
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static void select_row(uint8_t row) {
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gpio_set_pin_output(row_pins[row]);
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gpio_write_pin_low(row_pins[row]);
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}
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static void unselect_row(uint8_t row) { gpio_set_pin_input_high(row_pins[row]); }
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static void unselect_rows(void) {
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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gpio_set_pin_input_high(row_pins[x]);
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}
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}
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static void init_pins(void) {
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unselect_rows();
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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gpio_set_pin_input_high(col_pins[x]);
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}
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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// Select row and wait for row selecton to stabilize
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select_row(current_row);
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wait_us(30);
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// For each col...
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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// Select the col pin to read (active low)
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uint8_t pin_state = gpio_read_pin(col_pins[col_index]);
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// Populate the matrix row with the state of the col pin
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current_matrix[current_row] |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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// Unselect row
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unselect_row(current_row);
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return (last_row_value != current_matrix[current_row]);
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}
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void matrix_init_custom(void) {
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// initialize key pins
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gpio_set_pin_input(ENC_SW);
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init_pins();
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}
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bool matrix_scan_custom(void) {
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bool changed = false;
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// Set row, read cols
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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changed |= read_cols_on_row(raw_matrix, current_row);
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}
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// Read encoder switches, already debounced
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changed |= read_encoder_switches(matrix, 2);
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return changed;
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}
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static bool read_encoder_switches(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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// Debounce the encoder buttons using a shift register
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static uint8_t btn_1_array;
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bool btn_1_pressed = 0;
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btn_1_array <<= 1;
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btn_1_array |= gpio_read_pin(ENC_SW);
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(btn_1_array == 0b11111111) ? (btn_1_pressed = 1) : (btn_1_pressed = 0);
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// Populate the matrix row with the state of the encoder
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current_matrix[current_row] |= btn_1_pressed ? (1 << 0) : 0;
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return (last_row_value != current_matrix[current_row]);
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}
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