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- /* Copyright 2012 Jun Wako <[email protected]>
- *
- * This is heavily based on phantom/board.{c|h}.
- * https://github.com/BathroomEpiphanies/AVR-Keyboard
- *
- * Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
- * http://bathroomepiphanies.com
- *
- * As for liscensing consult with the original files or its author.
- */
- #include <stdint.h>
- #include <stdbool.h>
- #include <avr/io.h>
- #include <util/delay.h>
- #include "print.h"
- #include "debug.h"
- #include "util.h"
- #include "matrix.h"
-
-
- #ifndef DEBOUNCE
- # define DEBOUNCE 0
- #endif
- static uint8_t debouncing = DEBOUNCE;
-
- // bit array of key state(1:on, 0:off)
- static matrix_row_t matrix[MATRIX_ROWS];
- static matrix_row_t matrix_debouncing[MATRIX_ROWS];
-
- static uint8_t read_rows(void);
- static void init_rows(void);
- static void unselect_cols(void);
- static void select_col(uint8_t col);
-
- #ifndef SLEEP_LED_ENABLE
- /* LEDs are on output compare pins OC1B OC1C
- This activates fast PWM mode on them.
- Prescaler 256 and 8-bit counter results in
- 16000000/256/256 = 244 Hz blink frequency.
- LED_A: Caps Lock
- LED_B: Scroll Lock */
- /* Output on PWM pins are turned off when the timer
- reaches the value in the output compare register,
- and are turned on when it reaches TOP (=256). */
- static
- void setup_leds(void)
- {
- TCCR1A |= // Timer control register 1A
- (1<<WGM10) | // Fast PWM 8-bit
- (1<<COM1B1)| // Clear OC1B on match, set at TOP
- (1<<COM1C1); // Clear OC1C on match, set at TOP
- TCCR1B |= // Timer control register 1B
- (1<<WGM12) | // Fast PWM 8-bit
- (1<<CS12); // Prescaler 256
- OCR1B = LED_BRIGHTNESS; // Output compare register 1B
- OCR1C = LED_BRIGHTNESS; // Output compare register 1C
- // LEDs: LED_A -> PORTB6, LED_B -> PORTB7
- DDRB |= (1<<6) | (1<<7);
- PORTB &= ~((1<<6) | (1<<7));
- }
- #endif
-
- inline
- uint8_t matrix_rows(void)
- {
- return MATRIX_ROWS;
- }
-
- inline
- uint8_t matrix_cols(void)
- {
- return MATRIX_COLS;
- }
-
- void matrix_init(void)
- {
- // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
- MCUCR |= (1<<JTD);
- MCUCR |= (1<<JTD);
-
- // initialize row and col
- unselect_cols();
- init_rows();
- #ifndef SLEEP_LED_ENABLE
- setup_leds();
- #endif
-
- // 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 col = 0; col < MATRIX_COLS; col++) { // 0-16
- select_col(col);
- _delay_us(3); // without this wait it won't read stable value.
- uint8_t rows = read_rows();
- for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
- bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
- bool curr_bit = rows & (1<<row);
- if (prev_bit != curr_bit) {
- matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
- if (debouncing) {
- dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
- }
- debouncing = DEBOUNCE;
- }
- }
- unselect_cols();
- }
-
- 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];
- }
-
- void matrix_print(void)
- {
- print("\nr/c 0123456789ABCDEF\n");
- for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
- xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
- }
- }
-
- uint8_t matrix_key_count(void)
- {
- uint8_t count = 0;
- for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- count += bitpop32(matrix[i]);
- }
- return count;
- }
-
- /* Row pin configuration
- * row: 0 1 2 3 4 5
- * pin: B5 B4 B3 B2 B1 B0
- */
- static void init_rows(void)
- {
- // Input with pull-up(DDR:0, PORT:1)
- DDRB &= ~0b00111111;
- PORTB |= 0b00111111;
- }
-
- static uint8_t read_rows(void)
- {
- return (PINB&(1<<5) ? 0 : (1<<0)) |
- (PINB&(1<<4) ? 0 : (1<<1)) |
- (PINB&(1<<3) ? 0 : (1<<2)) |
- (PINB&(1<<2) ? 0 : (1<<3)) |
- (PINB&(1<<1) ? 0 : (1<<4)) |
- (PINB&(1<<0) ? 0 : (1<<5));
- }
-
- /* Column pin configuration
- * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
- * pin: D5 C7 C6 D4 D0 E6 F0 F1 F4 F5 F6 F7 D7 D6 D1 D2 D3
- */
- static void unselect_cols(void)
- {
- // Hi-Z(DDR:0, PORT:0) to unselect
- DDRC |= 0b11000000; // PC: 7 6
- PORTC |= 0b11000000;
- DDRD |= 0b11111111; // PD: 7 6 5 4 3 2 1 0
- PORTD |= 0b11111111;
- DDRE |= 0b01000000; // PE: 6
- PORTE |= 0b01000000;
- DDRF |= 0b11110011; // PF: 7 6 5 4 1 0
- PORTF |= 0b11110011;
- }
-
- static void select_col(uint8_t col)
- {
- // Output low(DDR:1, PORT:0) to select
- switch (col) {
- case 0:
- DDRD |= (1<<5);
- PORTD &= ~(1<<5);
- break;
- case 1:
- DDRC |= (1<<7);
- PORTC &= ~(1<<7);
- break;
- case 2:
- DDRC |= (1<<6);
- PORTC &= ~(1<<6);
- break;
- case 3:
- DDRD |= (1<<4);
- PORTD &= ~(1<<4);
- break;
- case 4:
- DDRD |= (1<<0);
- PORTD &= ~(1<<0);
- break;
- case 5:
- DDRE |= (1<<6);
- PORTE &= ~(1<<6);
- break;
- case 6:
- DDRF |= (1<<0);
- PORTF &= ~(1<<0);
- break;
- case 7:
- DDRF |= (1<<1);
- PORTF &= ~(1<<1);
- break;
- case 8:
- DDRF |= (1<<4);
- PORTF &= ~(1<<4);
- break;
- case 9:
- DDRF |= (1<<5);
- PORTF &= ~(1<<5);
- break;
- case 10:
- DDRF |= (1<<6);
- PORTF &= ~(1<<6);
- break;
- case 11:
- DDRF |= (1<<7);
- PORTF &= ~(1<<7);
- break;
- case 12:
- DDRD |= (1<<7);
- PORTD &= ~(1<<7);
- break;
- case 13:
- DDRD |= (1<<6);
- PORTD &= ~(1<<6);
- break;
- case 14:
- DDRD |= (1<<1);
- PORTD &= ~(1<<1);
- break;
- case 15:
- DDRD |= (1<<2);
- PORTD &= ~(1<<2);
- break;
- case 16:
- DDRD |= (1<<3);
- PORTD &= ~(1<<3);
- break;
- }
- }
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