271 lines
6.5 KiB
C
271 lines
6.5 KiB
C
/* 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;
|
|
}
|
|
}
|