273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/* Copyright 2012 Jun Wako <wakojun@gmail.com>
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*
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* This is heavily based on phantom/board.{c|h}.
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* https://github.com/BathroomEpiphanies/AVR-Keyboard
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*
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* Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
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* http://bathroomepiphanies.com
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*
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* As for liscensing consult with the original files or its author.
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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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// bit array of key 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 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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/* LEDs are on output compare pins OC1B OC1C
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This activates fast PWM mode on them.
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Prescaler 256 and 8-bit counter results in
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16000000/256/256 = 244 Hz blink frequency.
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LED_A: Caps Lock
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LED_B: Scroll Lock */
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/* Output on PWM pins are turned off when the timer
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reaches the value in the output compare register,
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and are turned on when it reaches TOP (=256). */
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static
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void setup_leds(void)
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{
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TCCR1A |= // Timer control register 1A
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(1<<WGM10) | // Fast PWM 8-bit
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(1<<COM1B1)| // Clear OC1B on match, set at TOP
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(1<<COM1C1); // Clear OC1C on match, set at TOP
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TCCR1B |= // Timer control register 1B
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(1<<WGM12) | // Fast PWM 8-bit
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(1<<CS12); // Prescaler 256
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OCR1B = 250; // Output compare register 1B
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OCR1C = 250; // Output compare register 1C
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// LEDs: LED_A -> PORTB6, LED_B -> PORTB7
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DDRB &= 0x3F;
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PORTB &= 0x3F;
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}
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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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// To use PORTF disable JTAG with writing JTD bit twice within four cycles.
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MCUCR |= (1<<JTD);
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MCUCR |= (1<<JTD);
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// initialize row and col
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unselect_cols();
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init_rows();
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setup_leds();
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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); // without this wait it won't read stable value.
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uint8_t rows = read_rows();
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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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debug("bounce!: "); debug_hex(debouncing); print("\n");
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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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phex(row); print(": ");
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print_bin_reverse32(matrix_get_row(row));
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print("\n");
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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: B0 B1 B2 B3 B4 B5
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*/
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static void init_rows(void)
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{
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// Input with pull-up(DDR:0, PORT:1)
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DDRB &= ~0b00111111;
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PORTB |= 0b00111111;
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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<<0) ? 0 : (1<<0)) |
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(PINB&(1<<1) ? 0 : (1<<1)) |
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(PINB&(1<<2) ? 0 : (1<<2)) |
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(PINB&(1<<3) ? 0 : (1<<3)) |
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(PINB&(1<<4) ? 0 : (1<<4)) |
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(PINB&(1<<5) ? 0 : (1<<5));
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}
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/* Column pin configuration
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* col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
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* pin: D5 C7 C6 D4 D0 E6 F0 F1 F4 F5 F6 F7 D7 D6 D1 D2 D3
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*/
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static void unselect_cols(void)
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{
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// Hi-Z(DDR:0, PORT:0) to unselect
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DDRC |= 0b11000000; // PC: 7 6
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PORTC |= 0b11000000;
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DDRD |= 0b11111111; // PD: 7 6 5 4 3 2 1 0
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PORTD |= 0b11111111;
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DDRE |= 0b01000000; // PE: 6
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PORTE |= 0b01000000;
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DDRF |= 0b11110011; // PF: 7 6 5 4 1 0
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PORTF |= 0b11110011;
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}
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static void select_col(uint8_t col)
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{
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// Output low(DDR:1, PORT:0) to select
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switch (col) {
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case 0:
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DDRD |= (1<<5);
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PORTD &= ~(1<<5);
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break;
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case 1:
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DDRC |= (1<<7);
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PORTC &= ~(1<<7);
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break;
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case 2:
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DDRC |= (1<<6);
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PORTC &= ~(1<<6);
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break;
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case 3:
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DDRD |= (1<<4);
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PORTD &= ~(1<<4);
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break;
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case 4:
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DDRD |= (1<<0);
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PORTD &= ~(1<<0);
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break;
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case 5:
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DDRE |= (1<<6);
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PORTE &= ~(1<<6);
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break;
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case 6:
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DDRF |= (1<<0);
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PORTF &= ~(1<<0);
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break;
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case 7:
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DDRF |= (1<<1);
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PORTF &= ~(1<<1);
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break;
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case 8:
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DDRF |= (1<<4);
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PORTF &= ~(1<<4);
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break;
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case 9:
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DDRF |= (1<<5);
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PORTF &= ~(1<<5);
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break;
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case 10:
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DDRF |= (1<<6);
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PORTF &= ~(1<<6);
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break;
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case 11:
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DDRF |= (1<<7);
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PORTF &= ~(1<<7);
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break;
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case 12:
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DDRD |= (1<<7);
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PORTD &= ~(1<<7);
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break;
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case 13:
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DDRD |= (1<<6);
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PORTD &= ~(1<<6);
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break;
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case 14:
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DDRD |= (1<<1);
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PORTD &= ~(1<<1);
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break;
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case 15:
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DDRD |= (1<<2);
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PORTD &= ~(1<<2);
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break;
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case 16:
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DDRD |= (1<<3);
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PORTD &= ~(1<<3);
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break;
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}
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}
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