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/*
Copyright 2012 Jun Wako < wakojun @ gmail . com >
This program is free software : you can redistribute it and / or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation , either version 2 of the License , or
( at your option ) any later version .
This program is distributed in the hope that it will be useful ,
but WITHOUT ANY WARRANTY ; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the
GNU General Public License for more details .
You should have received a copy of the GNU General Public License
along with this program . If not , see < http : //www.gnu.org/licenses/>.
*/
/*
* scan matrix
*/
# 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 5
# endif
static uint8_t debouncing = DEBOUNCE ;
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix [ MATRIX_ROWS ] ;
static matrix_row_t matrix_debouncing [ MATRIX_ROWS ] ;
static matrix_row_t read_cols ( void ) ;
static void init_cols ( void ) ;
static void unselect_rows ( void ) ;
static void select_row ( uint8_t row ) ;
inline
uint8_t matrix_rows ( void )
{
return MATRIX_ROWS ;
}
inline
uint8_t matrix_cols ( void )
{
return MATRIX_COLS ;
}
void matrix_init ( void )
{
debug_enable = true ;
debug_matrix = true ;
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debug_mouse = true ;
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// initialize row and col
unselect_rows ( ) ;
init_cols ( ) ;
// 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 i = 0 ; i < MATRIX_ROWS ; i + + ) {
select_row ( i ) ;
_delay_us ( 30 ) ; // without this wait read unstable value.
matrix_row_t cols = read_cols ( ) ;
if ( matrix_debouncing [ i ] ! = cols ) {
matrix_debouncing [ i ] = cols ;
if ( debouncing ) {
debug ( " bounce!: " ) ; debug_hex ( debouncing ) ; debug ( " \n " ) ;
}
debouncing = DEBOUNCE ;
}
unselect_rows ( ) ;
}
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 ( " \n r/c 0123456789ABCDEF \n " ) ;
for ( uint8_t row = 0 ; row < MATRIX_ROWS ; row + + ) {
phex ( row ) ; print ( " : " ) ;
pbin_reverse16 ( 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 + + ) {
count + = bitpop16 ( matrix [ i ] ) ;
}
return count ;
}
/* Column pin configuration
* col : 0
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* pin : B0
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*/
static void init_cols ( void )
{
// Input with pull-up(DDR:0, PORT:1)
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DDRB & = ~ ( 1 < < 0 ) ;
PORTB | = ( 1 < < 0 ) ;
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}
static matrix_row_t read_cols ( void )
{
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return ( PINB & ( 1 < < 0 ) ? 0 : ( 1 < < 0 ) ) ;
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}
/* Row pin configuration
* row : 0
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* pin : B1
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*/
static void unselect_rows ( void )
{
// Hi-Z(DDR:0, PORT:0) to unselect
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DDRB & = ~ 0 b00000010 ;
PORTB & = ~ 0 b00000010 ;
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}
static void select_row ( uint8_t row )
{
// Output low(DDR:1, PORT:0) to select
switch ( row ) {
case 0 :
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DDRB | = ( 1 < < 1 ) ;
PORTB & = ~ ( 1 < < 1 ) ;
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break ;
}
}