161 lines
3.2 KiB
C
161 lines
3.2 KiB
C
#define F_CPU 16000000UL
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#include <util/delay.h>
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#include <avr/io.h>
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#include <stdlib.h>
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#include "uno-matrix.h"
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#define debug(X) NULL
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#define debug_hex(X) NULL
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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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/* 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 matrix_row_t read_cols(void);
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static void init_cols(void);
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static void unselect_rows(void);
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static void select_row(uint8_t row);
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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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//debug_enable = true;
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//debug_matrix = true;
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//debug_mouse = true;
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// initialize row and col
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unselect_rows();
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init_cols();
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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 i = 0; i < MATRIX_ROWS; i++) {
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select_row(i);
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_delay_us(30); // without this wait read unstable value.
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matrix_row_t cols = read_cols();
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//Serial.println(cols, BIN);
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if (matrix_debouncing[i] != cols) {
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matrix_debouncing[i] = cols;
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if (debouncing) {
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debug("bounce!: "); debug_hex(debouncing); debug("\n");
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}
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debouncing = DEBOUNCE;
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}
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unselect_rows();
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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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// TODO update this comment
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/* Column pin configuration
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* col: 0 1 2 3 4 5
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* pin: D3 D4 D5 D6 D7 B0
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*/
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static void init_cols(void)
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{
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// Input with pull-up(DDR:0, PORT:1)
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DDRD &= ~(1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
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PORTD |= (1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
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DDRB &= ~(1<<0);
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PORTB |= (1<<0);
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}
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static matrix_row_t read_cols(void)
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{
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return (PIND&(1<<3) ? 0 : (1<<0)) |
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(PIND&(1<<4) ? 0 : (1<<1)) |
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(PIND&(1<<5) ? 0 : (1<<2)) |
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(PIND&(1<<6) ? 0 : (1<<3)) |
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(PIND&(1<<7) ? 0 : (1<<4)) |
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(PINB&(1<<0) ? 0 : (1<<5));
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}
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/* Row pin configuration
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* row: 0 1 2 3
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* pin: C0 C1 C2 C3
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*/
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static void unselect_rows(void)
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{
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// Hi-Z(DDR:0, PORT:0) to unselect
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DDRC &= ~0xF;
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PORTC &= ~0xF;
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}
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static void select_row(uint8_t row)
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{
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// Output low(DDR:1, PORT:0) to select
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switch (row) {
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case 0:
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DDRC |= (1<<0);
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PORTC &= ~(1<<0);
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break;
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case 1:
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DDRC |= (1<<1);
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PORTC &= ~(1<<1);
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break;
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case 2:
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DDRC |= (1<<2);
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PORTC &= ~(1<<2);
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break;
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case 3:
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DDRC |= (1<<3);
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PORTC &= ~(1<<3);
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break;
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}
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}
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