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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 ;
static matrix_row_t * matrix_debounced ;
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static matrix_row_t matrix0 [ MATRIX_ROWS ] ;
static matrix_row_t matrix1 [ MATRIX_ROWS ] ;
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# 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
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for ( uint8_t i = 0 ; i < MATRIX_ROWS ; i + + ) {
matrix0 [ i ] = 0 ;
matrix1 [ i ] = 0 ;
}
matrix = matrix0 ;
matrix_debounced = matrix1 ;
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}
uint8_t matrix_scan ( void )
{
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 ) {
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if ( - - debouncing ) {
_delay_ms ( 1 ) ;
} else {
matrix_row_t * tmp = matrix_debounced ;
matrix_debounced = matrix ;
matrix = tmp ;
}
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}
return 1 ;
}
bool matrix_is_modified ( void )
{
// NOTE: no longer used
return true ;
}
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 ( " \n r/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 ;
}