123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
/* Copyright 2021 Jay Greco
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*
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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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*
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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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*
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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 "matrix.h"
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#include <string.h>
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#include "split_util.h"
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#include "wait.h"
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#define VIRT_COLS_PER_HAND 1
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#define PHYS_COLS_PER_HAND (MATRIX_COLS - VIRT_COLS_PER_HAND)
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#define ROWS_PER_HAND (MATRIX_ROWS / 2)
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#define COL_SHIFTER ((uint32_t)1)
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#define EXT_PIN_ROW 2
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#define EXT_PIN_COL 8
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// Row & column pins
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static uint8_t row_pins_left[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static uint8_t col_pins_left[MATRIX_MUX_COLS] = MATRIX_COL_MUX_PINS;
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static uint8_t row_pins_right[MATRIX_ROWS] = MATRIX_ROW_PINS_RIGHT;
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static uint8_t col_pins_right[MATRIX_MUX_COLS] = MATRIX_COL_MUX_PINS_RIGHT;
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static uint8_t* row_pins = row_pins_left;
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static uint8_t* col_pins = col_pins_left;
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// Internal functions
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static void init_pins(void) {
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// Set cols to outputs, low
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for (uint8_t pin = 0; pin < MATRIX_MUX_COLS; pin++) {
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gpio_set_pin_output(col_pins[pin]);
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}
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// Unselect cols
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for (uint8_t bit = 0; bit < MATRIX_MUX_COLS; bit++) {
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gpio_write_pin_low(col_pins[bit]);
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}
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// Set rows to input, pullup
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for (uint8_t pin = 0; pin < ROWS_PER_HAND; pin++) {
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gpio_set_pin_input_high(row_pins[pin]);
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}
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// Set extended pin (only on right side)
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if (!isLeftHand) {
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// Set extended pin to input, pullup
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gpio_set_pin_input_high(MATRIX_EXT_PIN_RIGHT);
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}
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}
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static void select_col(uint8_t col) {
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// Drive demux with correct column address
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for (uint8_t bit = 0; bit < MATRIX_MUX_COLS; bit++) {
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uint8_t state = (col & (0b1 << bit)) >> bit;
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gpio_write_pin(col_pins[bit], !state);
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}
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}
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static void read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
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select_col(current_col % PHYS_COLS_PER_HAND);
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wait_us(5);
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// Read each row sequentially
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for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
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if (gpio_read_pin(row_pins[row_index]) == 0) {
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current_matrix[row_index] |= (COL_SHIFTER << current_col);
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} else {
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current_matrix[row_index] &= ~(COL_SHIFTER << current_col);
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}
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}
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}
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static void read_ext_pin(matrix_row_t current_matrix[]) {
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// Read the state of the extended matrix pin
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if (!isLeftHand) {
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if (gpio_read_pin(MATRIX_EXT_PIN_RIGHT) == 0) {
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current_matrix[EXT_PIN_ROW] |= (COL_SHIFTER << EXT_PIN_COL);
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} else {
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current_matrix[EXT_PIN_ROW] &= ~(COL_SHIFTER << EXT_PIN_COL);
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}
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}
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}
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void matrix_init_custom(void) {
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if (!isLeftHand) {
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row_pins = row_pins_right;
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col_pins = col_pins_right;
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}
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init_pins();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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matrix_row_t last_matrix[MATRIX_ROWS];
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memcpy(last_matrix, current_matrix, sizeof(last_matrix));
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#ifdef DEBUG_SLOW_MATRIX
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// Slow for debugging
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wait_ms(1000);
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#endif
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// Set col, read rows
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for (uint8_t current_col = 0; current_col < PHYS_COLS_PER_HAND; current_col++) {
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read_rows_on_col(current_matrix, current_col);
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}
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// Read extended pin and store in matrix
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read_ext_pin(current_matrix);
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// Check if the matrix changed
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bool changed = memcmp(last_matrix, current_matrix, sizeof(last_matrix)) != 0;
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return changed;
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}
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