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/*
Copyright 2014 Kai Ryu < kai1103 @ 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/>.
*/
# include <avr/io.h>
# include <avr/interrupt.h>
# include <avr/pgmspace.h>
# include "backlight.h"
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# include "breathing_led.h"
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static const uint8_t backlight_table [ ] PROGMEM = {
0 , 16 , 128 , 255
} ;
/* Backlight pin configuration
* PWM : PC6 ( OC3A )
*/
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void backlight_enable ( void )
{
// Turn on PWM
cli ( ) ;
DDRC | = ( 1 < < PC6 ) ;
TCCR3A | = ( ( 1 < < WGM10 ) | ( 1 < < COM3A1 ) ) ;
TCCR3B | = ( ( 1 < < CS31 ) | ( 1 < < CS30 ) ) ;
sei ( ) ;
}
void backlight_disable ( void )
{
// Turn off PWM
cli ( ) ;
DDRC & = ~ ( 1 < < PC6 ) ;
TCCR3A & = ~ ( ( 1 < < WGM10 ) | ( 1 < < COM3A1 ) ) ;
TCCR3B & = ~ ( ( 1 < < CS31 ) | ( 1 < < CS30 ) ) ;
sei ( ) ;
}
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void backlight_set ( uint8_t level )
{
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# ifdef BREATHING_LED_ENABLE
switch ( level ) {
case 1 :
case 2 :
case 3 :
backlight_enable ( ) ;
breathing_led_disable ( ) ;
backlight_set_raw ( pgm_read_byte ( & backlight_table [ level ] ) ) ;
break ;
case 4 :
case 5 :
case 6 :
backlight_enable ( ) ;
breathing_led_enable ( ) ;
breathing_led_set_duration ( 6 - level ) ;
break ;
case 0 :
default :
breathing_led_disable ( ) ;
backlight_disable ( ) ;
break ;
}
# else
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if ( level > 0 ) {
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backlight_enable ( ) ;
backlight_set_raw ( pgm_read_byte ( & backlight_table [ level ] ) ) ;
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}
else {
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backlight_disable ( ) ;
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}
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# endif
}
# ifdef BREATHING_LED_ENABLE
void breathing_led_set_raw ( uint8_t raw )
{
backlight_set_raw ( raw ) ;
}
# endif
inline void backlight_set_raw ( uint8_t raw )
{
OCR3A = raw ;
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}