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/* Copyright 2012 Jun Wako <wakojun@gmail.com>
*
* 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);
/* 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 = 250; // Output compare register 1B
OCR1C = 250; // Output compare register 1C
// LEDs: LED_A -> PORTB6, LED_B -> PORTB7
DDRB &= 0x3F;
PORTB &= 0x3F;
}
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();
setup_leds();
// 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: B0 B1 B2 B3 B4 B5
*/
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<<0) ? 0 : (1<<0)) |
(PINB&(1<<1) ? 0 : (1<<1)) |
(PINB&(1<<2) ? 0 : (1<<2)) |
(PINB&(1<<3) ? 0 : (1<<3)) |
(PINB&(1<<4) ? 0 : (1<<4)) |
(PINB&(1<<5) ? 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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