284 lines
6.7 KiB
C
284 lines
6.7 KiB
C
/*
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Copyright 2013 Mathias Andersson <wraul@dbox.se>
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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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/* matrix state(1:on, 0:off) */
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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 uint8_t read_caps(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
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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
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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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// initialize matrix state: all keys off
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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++) { // 0-16
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select_col(col);
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_delay_us(3); // TODO: Determine the correct value needed here.
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uint8_t rows = read_rows();
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// Use the otherwise unused col: 0 row: 3 for caps lock.
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if(col == 0) {
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rows |= read_caps();
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}
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
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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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if (debouncing) {
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dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
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}
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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
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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
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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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* row: 0 1 2 3 4 5
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* pin: D0 D1 D2 D3 D5 B7
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*
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* Caps lock uses its own pin PE2
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*/
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static void init_rows(void)
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{
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// Input (DDR:0, PORT:0)
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DDRD &= ~0b00101111;
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PORTD &= ~0b00101111;
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DDRB &= ~(1<<7);
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PORTB &= ~(1<<7);
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// Input with pull-up (DDR:0, PORT:1)
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DDRE &= ~(1<<2);
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PORTE |= (1<<2);
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}
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static uint8_t read_rows(void)
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{
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return (PIND&(1<<0) ? (1<<0) : 0) |
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(PIND&(1<<1) ? (1<<1) : 0) |
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(PIND&(1<<2) ? (1<<2) : 0) |
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(PIND&(1<<3) ? (1<<3) : 0) |
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(PIND&(1<<5) ? (1<<4) : 0) |
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(PINB&(1<<7) ? (1<<5) : 0);
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}
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static uint8_t read_caps(void)
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{
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return PINE&(1<<2) ? 0 : (1<<3);
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}
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/* Columns 0 - 15
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* These columns uses two 74HC237D 3 to 8 bit demultiplexers.
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* col / pin: PC6 PB6 PF0 PF1 PC7
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* 0: 1 0 0 0 0
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* 1: 1 0 1 0 0
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* 2: 1 0 0 1 0
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* 3: 1 0 1 1 0
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* 4: 1 0 0 0 1
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* 5: 1 0 1 0 1
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* 6: 1 0 0 1 1
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* 7: 1 0 1 1 1
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* 8: 0 1 0 0 0
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* 9: 0 1 1 0 0
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* 10: 0 1 0 1 0
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* 11: 0 1 1 1 0
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* 12: 0 1 0 0 1
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* 13: 0 1 1 0 1
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* 14: 0 1 0 1 1
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* 15: 0 1 1 1 1
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*
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* col: 16
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* pin: PB5
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*/
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static void unselect_cols(void)
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{
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DDRB |= (1<<5) | (1<<6);
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PORTB &= ~((1<<5) | (1<<6));
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DDRC |= (1<<6) | (1<<7);
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PORTC &= ~((1<<6) | (1<<7));
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DDRF |= (1<<0) | (1<<1);
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PORTF &= ~((1<<0) | (1<<1));
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}
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static void select_col(uint8_t col)
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{
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// Output high (DDR:1, PORT:1) to select
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switch (col) {
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case 0:
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PORTC |= (1<<6);
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break;
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case 1:
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PORTC |= (1<<6);
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PORTF |= (1<<0);
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break;
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case 2:
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PORTC |= (1<<6);
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PORTF |= (1<<1);
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break;
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case 3:
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PORTC |= (1<<6);
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PORTF |= (1<<0) | (1<<1);
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break;
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case 4:
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PORTC |= (1<<6);
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PORTC |= (1<<7);
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break;
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case 5:
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PORTC |= (1<<6);
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PORTF |= (1<<0);
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PORTC |= (1<<7);
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break;
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case 6:
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PORTC |= (1<<6);
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PORTF |= (1<<1);
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PORTC |= (1<<7);
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break;
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case 7:
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PORTC |= (1<<6);
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PORTF |= (1<<0) | (1<<1);
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PORTC |= (1<<7);
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break;
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case 8:
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PORTB |= (1<<6);
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break;
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case 9:
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PORTB |= (1<<6);
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PORTF |= (1<<0);
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break;
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case 10:
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PORTB |= (1<<6);
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PORTF |= (1<<1);
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break;
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case 11:
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PORTB |= (1<<6);
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PORTF |= (1<<0) | (1<<1);
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break;
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case 12:
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PORTB |= (1<<6);
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PORTC |= (1<<7);
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break;
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case 13:
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PORTB |= (1<<6);
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PORTF |= (1<<0);
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PORTC |= (1<<7);
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break;
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case 14:
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PORTB |= (1<<6);
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PORTF |= (1<<1);
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PORTC |= (1<<7);
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break;
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case 15:
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PORTB |= (1<<6);
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PORTF |= (1<<0) | (1<<1);
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PORTC |= (1<<7);
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break;
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case 16:
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PORTB |= (1<<5);
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break;
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}
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}
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