/* 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;
static matrix_row_t *matrix_debounced;
static matrix_row_t _matrix0[MATRIX_ROWS];
static matrix_row_t _matrix1[MATRIX_ROWS];
#define _DDRA (uint8_t *const)&DDRA
#define _DDRB (uint8_t *const)&DDRB
#define _DDRC (uint8_t *const)&DDRC
#define _DDRD (uint8_t *const)&DDRD
#define _DDRE (uint8_t *const)&DDRE
#define _DDRF (uint8_t *const)&DDRF
#define _PINA (uint8_t *const)&PINA
#define _PINB (uint8_t *const)&PINB
#define _PINC (uint8_t *const)&PINC
#define _PIND (uint8_t *const)&PIND
#define _PINE (uint8_t *const)&PINE
#define _PINF (uint8_t *const)&PINF
#define _PORTA (uint8_t *const)&PORTA
#define _PORTB (uint8_t *const)&PORTB
#define _PORTC (uint8_t *const)&PORTC
#define _PORTD (uint8_t *const)&PORTD
#define _PORTE (uint8_t *const)&PORTE
#define _PORTF (uint8_t *const)&PORTF
#define _BIT0 0x01
#define _BIT1 0x02
#define _BIT2 0x04
#define _BIT3 0x08
#define _BIT4 0x10
#define _BIT5 0x20
#define _BIT6 0x40
#define _BIT7 0x80
/* Specifies the ports and pin numbers for the rows */
static
uint8_t *const row_ddr[MATRIX_ROWS] = {_DDRB, _DDRB, _DDRB, _DDRB, _DDRB, _DDRB};
static
uint8_t *const row_port[MATRIX_ROWS] = {_PORTB, _PORTB, _PORTB, _PORTB, _PORTB, _PORTB};
static
uint8_t *const row_pin[MATRIX_ROWS] = {_PINB, _PINB, _PINB, _PINB, _PINB, _PINB};
static
const uint8_t row_bit[MATRIX_ROWS] = { _BIT0, _BIT1, _BIT2, _BIT3, _BIT4, _BIT5};
/* Specifies the ports and pin numbers for the columns */
static
uint8_t *const col_ddr[MATRIX_COLS] = { _DDRD, _DDRC, _DDRC, _DDRD, _DDRD, _DDRE,
_DDRF, _DDRF, _DDRF, _DDRF, _DDRF, _DDRF,
_DDRD, _DDRD, _DDRD, _DDRD, _DDRD};
static
uint8_t *const col_port[MATRIX_COLS] = {_PORTD, _PORTC, _PORTC, _PORTD, _PORTD, _PORTE,
_PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF,
_PORTD, _PORTD, _PORTD, _PORTD, _PORTD};
static
const uint8_t col_bit[MATRIX_COLS] = { _BIT5, _BIT7, _BIT6, _BIT4, _BIT0, _BIT6,
_BIT0, _BIT1, _BIT4, _BIT5, _BIT6, _BIT7,
_BIT7, _BIT6, _BIT1, _BIT2, _BIT3};
static
inline void pull_column(int col) {
*col_port[col] &= ~col_bit[col];
}
static
inline void release_column(int col) {
*col_port[col] |= col_bit[col];
}
/* PORTB is set as input with pull-up resistors
PORTC,D,E,F are set to high output */
static
void setup_io_pins(void) {
uint8_t row, col;
for(row = 0; row < MATRIX_ROWS; row++) {
*row_ddr[row] &= ~row_bit[row];
*row_port[row] |= row_bit[row];
}
for(col = 0; col < MATRIX_COLS; col++) {
*col_ddr[col] |= col_bit[col];
*col_port[col] |= col_bit[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
setup_io_pins();
setup_leds();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
matrix = _matrix0;
matrix_debounced = _matrix1;
}
uint8_t matrix_scan(void)
{
if (!debouncing) {
matrix_row_t *tmp = matrix_debounced;
matrix_debounced = matrix;
matrix = tmp;
}
for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16
pull_column(col); // output hi on theline
_delay_us(3); // without this wait it won't read stable value.
for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
bool prev_bit = matrix[row] & ((matrix_row_t)1<<col);
bool curr_bit = !(*row_pin[row] & row_bit[row]);
if (prev_bit != curr_bit) {
matrix[row] ^= ((matrix_row_t)1<<col);
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); print("\n");
}
debouncing = DEBOUNCE;
}
}
release_column(col);
}
if (debouncing) {
debouncing--;
}
return 1;
}
bool matrix_is_modified(void)
{
// NOTE: no longer used
return true;
}
inline
bool matrix_has_ghost(void)
{
return false;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix_debounced[row] & ((matrix_row_t)1<<col));
}
inline
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix_debounced[row];
}
void matrix_print(void)
{
print("\nr/c 01234567\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
phex(row); print(": ");
pbin_reverse(matrix_get_row(row));
print("\n");
}
}
uint8_t matrix_key_count(void)
{
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
for (uint8_t j = 0; j < MATRIX_COLS; j++) {
if (matrix_is_on(i, j))
count++;
}
}
return count;
}