108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*
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Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
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Modified by Ryan Skidmore <rskeys@ryanskidmore.co.uk> (@ryanskidmore)
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to support the rskeys100.
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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 "matrix.h"
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#include <util/delay.h>
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static const uint32_t col_values[24] = SHR_COLS;
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static uint8_t read_rows(void);
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static void select_col(uint8_t col);
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static void shift_pulse(void);
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static void shift_out_single(uint8_t value);
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static void shift_out(uint32_t value);
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void matrix_init_custom(void) {
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gpio_set_pin_input(ROW_A);
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gpio_set_pin_input(ROW_B);
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gpio_set_pin_input(ROW_C);
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gpio_set_pin_input(ROW_D);
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gpio_set_pin_input(ROW_E);
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gpio_set_pin_input(ROW_F);
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gpio_set_pin_output(SHR_DATA);
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gpio_set_pin_output(SHR_LATCH);
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gpio_set_pin_output(SHR_CLOCK);
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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for (uint8_t col = 0; col < MATRIX_COLS; col++) {
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select_col(col);
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_delay_us(1);
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uint8_t rows = read_rows();
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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bool prev_bit = ((uint32_t)(current_matrix[row]) & (matrix_row_t)(1UL << col)) ? 1 : 0;
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bool curr_bit = ((uint32_t)rows & (uint32_t)(1UL << row)) ? 1 : 0;
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if (prev_bit != curr_bit) {
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current_matrix[row] = (uint32_t)(current_matrix[row]) ^ (uint32_t)(1UL << col);
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changed = true;
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}
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}
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}
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return changed;
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}
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static uint8_t read_rows(void) {
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return (gpio_read_pin(ROW_F) << 5)
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| (gpio_read_pin(ROW_E) << 4)
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| (gpio_read_pin(ROW_D) << 3)
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| (gpio_read_pin(ROW_C) << 2)
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| (gpio_read_pin(ROW_B) << 1)
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| (gpio_read_pin(ROW_A) );
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}
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static void select_col(uint8_t col) {
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shift_out(col_values[col]);
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}
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static void shift_out(uint32_t value) {
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gpio_write_pin_low(SHR_LATCH);
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uint8_t first_byte = (value >> 16) & 0xFF;
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uint8_t second_byte = (value >> 8) & 0xFF;
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uint8_t third_byte = (uint8_t)(value & 0xFF);
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shift_out_single(first_byte);
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shift_out_single(second_byte);
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shift_out_single(third_byte);
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gpio_write_pin_high(SHR_LATCH);
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/* We delay here to prevent multiple consecutive keys being triggered with a single switch press */
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_delay_us(10);
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}
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static void shift_out_single(uint8_t value) {
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for (uint8_t i = 0; i < 8; i++) {
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if (value & 0b10000000) {
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gpio_write_pin_high(SHR_DATA);
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} else {
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gpio_write_pin_low(SHR_DATA);
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}
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shift_pulse();
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value = value << 1;
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}
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}
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static inline void shift_pulse(void) {
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gpio_write_pin_high(SHR_CLOCK);
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gpio_write_pin_low(SHR_CLOCK);
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} |