268 lines
6.2 KiB
C
268 lines
6.2 KiB
C
/**
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* matrix.c
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*
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Copyright 2020 astro <yuleiz@gmail.com>
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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 "print.h"
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#include "bitwise.h"
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#include "wait.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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static uint8_t debouncing = DEBOUNCE;
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static matrix_row_t matrix[MATRIX_ROWS];
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static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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static uint8_t read_rows(void);
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static void init_rows(void);
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static void init_cols(void);
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static void unselect_cols(void);
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static void select_col(uint8_t col);
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__attribute__ ((weak))
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void matrix_init_kb(void)
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{
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matrix_init_user();
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}
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__attribute__ ((weak))
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void matrix_scan_kb(void)
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{
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matrix_scan_user();
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}
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__attribute__ ((weak))
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void matrix_init_user(void) {}
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__attribute__ ((weak))
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void matrix_scan_user(void) {}
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void matrix_init(void)
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{
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//gpio_set_pin_output(F0);
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//gpio_write_pin_high(F0);
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gpio_set_pin_output(B4);
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gpio_write_pin_low(B4);
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init_cols();
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init_rows();
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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matrix_debouncing[i] = 0;
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}
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matrix_init_kb();
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}
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uint8_t matrix_scan(void)
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{
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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(3);
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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 = matrix_debouncing[row] & ((matrix_row_t)1<<col);
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bool curr_bit = rows & (1<<row);
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if (prev_bit != curr_bit) {
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matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
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debouncing = DEBOUNCE;
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}
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}
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unselect_cols();
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}
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if (debouncing) {
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if (--debouncing) {
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_delay_ms(1);
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} else {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debouncing[i];
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}
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}
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}
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matrix_scan_kb();
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return 1;
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}
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inline matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 0123456789ABCDEF\n");
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
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}
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}
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/*
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* Row pin configuration
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* row: 0 1 2 3 4
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* pin: PE6 PF6 PF7 PB7 PD4
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*/
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static void init_rows(void)
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{
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gpio_set_pin_input_high(E6);
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gpio_set_pin_input_high(F6);
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gpio_set_pin_input_high(F7);
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gpio_set_pin_input_high(B7);
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gpio_set_pin_input_high(D4);
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}
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static uint8_t read_rows(void)
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{
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return ((gpio_read_pin(E6) ? 0 : (1 << 0)) |
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(gpio_read_pin(F6) ? 0 : (1 << 1)) |
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(gpio_read_pin(F7) ? 0 : (1 << 2)) |
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(gpio_read_pin(B7) ? 0 : (1 << 3)) |
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(gpio_read_pin(D4) ? 0 : (1 << 4)));
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}
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/*
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* Columns 0 - 13
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* These columns uses two 74LVC138 3 to 8 bit demultiplexers.
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* EN Pin, PF5, PD6
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*
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* col / pin: PF0 PF1 PF4
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* 0: 0 0 0
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* 1: 1 0 0
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* 2: 0 1 0
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* 3: 1 1 0
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* 4: 0 0 1
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* 5: 1 0 1
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* 6: 0 1 1
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* PD2 PD3 PD5
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* 7: 0 0 0
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* 8: 1 0 0
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* 9: 0 1 0
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* 10: 1 1 0
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* 11: 0 0 1
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* 12: 1 0 1
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* 13: 0 1 1
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*
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*/
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static void init_cols(void)
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{
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gpio_set_pin_output(F0);
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gpio_set_pin_output(F1);
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gpio_set_pin_output(F4);
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gpio_set_pin_output(F5);
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gpio_set_pin_output(D2);
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gpio_set_pin_output(D3);
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gpio_set_pin_output(D5);
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gpio_set_pin_output(D6);
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unselect_cols();
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}
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static void unselect_cols(void)
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{
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gpio_write_pin_high(F0);
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gpio_write_pin_high(F1);
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gpio_write_pin_high(F4);
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gpio_write_pin_high(F5);
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gpio_write_pin_high(D2);
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gpio_write_pin_high(D3);
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gpio_write_pin_high(D5);
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gpio_write_pin_high(D6);
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}
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static void select_col(uint8_t col) {
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switch (col) {
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case 0:
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gpio_write_pin_low(F0);
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gpio_write_pin_low(F1);
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gpio_write_pin_low(F4);
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break;
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case 1:
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gpio_write_pin_high(F0);
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gpio_write_pin_low(F1);
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gpio_write_pin_low(F4);
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break;
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case 2:
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gpio_write_pin_low(F0);
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gpio_write_pin_high(F1);
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gpio_write_pin_low(F4);
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break;
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case 3:
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gpio_write_pin_high(F0);
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gpio_write_pin_high(F1);
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gpio_write_pin_low(F4);
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break;
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case 4:
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gpio_write_pin_low(F0);
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gpio_write_pin_low(F1);
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gpio_write_pin_high(F4);
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break;
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case 5:
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gpio_write_pin_high(F0);
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gpio_write_pin_low(F1);
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gpio_write_pin_high(F4);
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break;
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case 6:
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gpio_write_pin_low(F0);
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gpio_write_pin_high(F1);
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gpio_write_pin_high(F4);
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break;
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case 7:
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gpio_write_pin_low(D2);
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gpio_write_pin_low(D3);
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gpio_write_pin_low(D5);
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break;
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case 8:
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gpio_write_pin_high(D2);
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gpio_write_pin_low(D3);
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gpio_write_pin_low(D5);
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break;
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case 9:
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gpio_write_pin_low(D2);
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gpio_write_pin_high(D3);
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gpio_write_pin_low(D5);
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break;
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case 10:
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gpio_write_pin_high(D2);
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gpio_write_pin_high(D3);
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gpio_write_pin_low(D5);
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break;
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case 11:
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gpio_write_pin_low(D2);
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gpio_write_pin_low(D3);
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gpio_write_pin_high(D5);
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break;
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case 12:
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gpio_write_pin_high(D2);
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gpio_write_pin_low(D3);
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gpio_write_pin_high(D5);
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break;
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case 13:
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gpio_write_pin_low(D2);
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gpio_write_pin_high(D3);
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gpio_write_pin_high(D5);
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break;
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}
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}
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