238 lines
5.8 KiB
C
238 lines
5.8 KiB
C
/*
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Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
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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 <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 0
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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 unselect_cols(void);
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static void select_col(uint8_t col);
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inline uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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unselect_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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}
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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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return 1;
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}
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bool matrix_is_modified(void)
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{
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if (debouncing) return false;
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return true;
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}
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inline bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & ((matrix_row_t)1<<col));
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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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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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count += bitpop32(matrix[i]);
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}
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return count;
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}
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/* Row pin configuration
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*
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* row: 0 1 2 3 4 5 6 7
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* pin: PB1 PC2 PB6 PB4 PB3 PB5 PB0 PB2
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*
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*/
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static void init_rows(void)
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{
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DDRC &= ~0b00000100;
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DDRB &= ~0b01111111;
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PORTC |= 0b00000100;
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PORTB |= 0b01111111;
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}
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static uint8_t read_rows(void)
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{
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return (PINB&(1<<1) ? 0 : (1<<0)) |
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(PINC&(1<<2) ? 0 : (1<<1)) |
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(PINB&(1<<6) ? 0 : (1<<2)) |
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(PINB&(1<<4) ? 0 : (1<<3)) |
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(PINB&(1<<3) ? 0 : (1<<4)) |
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(PINB&(1<<5) ? 0 : (1<<5)) |
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(PINB&(1<<0) ? 0 : (1<<6)) |
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(PINB&(1<<2) ? 0 : (1<<7));
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}
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/* These columns uses two 74HC42 4 to 10 bit demultiplexers (low active).
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*
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* COL PD6 PD5 PD4 PD3 PD2 PD1
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* 10 1 1 0 0 0 0
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* 15 1 1 0 0 0 1
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* 8 1 1 0 0 1 0
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* 14 1 1 0 1 0 0
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* 6 1 1 0 1 0 1
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* 13 1 1 0 1 1 0
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* 12 1 1 1 0 0 0
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* 9 1 1 1 0 1 0
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* 11 1 1 1 1 0 0
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* 7 1 1 1 1 1 0
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*
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* COL PD1 PD2 PD3 PD4 PD5 PD6
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* 3 1 1 0 0 0 1
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* 4 1 1 0 0 1 0
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* 17 1 1 0 1 0 0
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* 16 1 1 0 1 1 0
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* 0 1 1 1 0 0 1
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* 5 1 1 1 0 1 0
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* 2 1 1 1 1 0 0
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* 1 1 1 1 1 1 0
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*/
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static void unselect_cols(void)
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{
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DDRD |= 0b01111111;
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PORTD &= ~0b01111111;
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}
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static void select_col(uint8_t col)
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{
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switch (col) {
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case 0:
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PORTD |= (1<<6) | (1<<3) | (1<<2) | (1<<1);
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break;
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case 1:
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PORTD |= (1<<5) | (1<<4) | (1<<3) | (1<<2) | (1<<1);
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break;
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case 2:
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PORTD |= (1<<4) | (1<<3) | (1<<2) | (1<<1);
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break;
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case 3:
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PORTD |= (1<<6) | (1<<2) | (1<<1);
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break;
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case 4:
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PORTD |= (1<<5) | (1<<2) | (1<<1);
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break;
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case 5:
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PORTD |= (1<<5) | (1<<3) | (1<<2) | (1<<1);
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break;
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case 6:
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PORTD |= (1<<6) | (1<<5) | (1<<3) | (1<<1);
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break;
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case 7:
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PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<3) | (1<<2);
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break;
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case 8:
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PORTD |= (1<<6) | (1<<5) | (1<<2);
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break;
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case 9:
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PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<2);
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break;
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case 10:
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PORTD |= (1<<6) | (1<<5);
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break;
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case 11:
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PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<3);
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break;
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case 12:
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PORTD |= (1<<6) | (1<<5) | (1<<4);
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break;
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case 13:
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PORTD |= (1<<6) | (1<<5) | (1<<3) | (1<<2);
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break;
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case 14:
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PORTD |= (1<<6) | (1<<5) | (1<<3);
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break;
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case 15:
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PORTD |= (1<<6) | (1<<5) | (1<<1);
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break;
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case 16:
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PORTD |= (1<<5) | (1<<4) | (1<<2) | (1<<1);
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break;
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case 17:
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PORTD |= (1<<4) | (1<<2) | (1<<1);
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break;
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}
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}
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