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