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/*
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Copyright 2013 , 2014 Kai Ryu < kai1103 @ gmail . com >
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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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# ifdef GH60_REV_CHN
# else
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# define SOFTPWM_TIMER_TOP F_CPU / (256*64)
uint8_t softpwm_ocr = 0 ;
uint8_t softpwm_ocr_buff = 0 ;
# endif
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static const uint8_t backlight_table [ ] PROGMEM = {
0 , 16 , 128 , 255
} ;
/* Backlight pin configuration
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* PWM : PB6 ( Rev . CHN )
* GPIO : PF7 PF6 PF5 PF4 ( Rev . B )
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*/
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void backlight_enable ( void )
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{
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# if defined(GH60_REV_CHN)
// Turn on PWM
DDRB | = ( 1 < < PB6 ) ;
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cli ( ) ;
TCCR1A | = ( ( 1 < < WGM10 ) | ( 1 < < COM1B1 ) ) ;
TCCR1B | = ( ( 1 < < CS11 ) | ( 1 < < CS10 ) ) ;
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sei ( ) ;
# else
DDRF | = ( 1 < < PF7 | 1 < < PF6 | 1 < < PF5 | 1 < < PF4 ) ;
PORTF | = ( 1 < < PF7 | 1 < < PF6 | 1 < < PF5 | 1 < < PF4 ) ;
cli ( ) ;
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TCCR1B | = ( 1 < < WGM12 ) ;
TCCR1B | = ( 1 < < CS10 ) ;
OCR1AH = ( SOFTPWM_TIMER_TOP > > 8 ) & 0xff ;
OCR1AL = SOFTPWM_TIMER_TOP & 0xff ;
TIMSK1 | = ( 1 < < OCIE1A ) ;
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sei ( ) ;
# endif
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}
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void backlight_disable ( void )
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{
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# if defined(GH60_REV_CHN)
// Turn off PWM
cli ( ) ;
DDRB & = ~ ( 1 < < PB6 ) ;
TCCR1A & = ~ ( ( 1 < < WGM10 ) | ( 1 < < COM1B1 ) ) ;
TCCR1B & = ~ ( ( 1 < < CS11 ) | ( 1 < < CS10 ) ) ;
sei ( ) ;
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OCR1B = 0 ;
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# else
DDRF & = ~ ( 1 < < PF7 | 1 < < PF6 | 1 < < PF5 | 1 < < PF4 ) ;
cli ( ) ;
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TCCR1B & = ~ ( 1 < < WGM12 ) ;
TCCR1B & = ~ ( 1 < < CS10 ) ;
TIMSK1 & = ~ ( 1 < < OCIE1A ) ;
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sei ( ) ;
OCR1A = 0 ;
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# endif
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}
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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 ( ) ;
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backlight_set_raw ( pgm_read_byte ( & backlight_table [ level ] ) ) ;
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}
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else {
backlight_disable ( ) ;
}
# endif
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}
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# 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 )
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{
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# if defined(GH60_REV_CHN)
OCR1B = raw ;
# else
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softpwm_ocr_buff = raw ;
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# endif
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}
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# if defined(GH60_REV_CHN)
# else
ISR ( TIMER1_COMPA_vect )
{
static uint8_t pwm = 0 ;
pwm + + ;
// LED on
if ( pwm = = 0 ) {
//PORTB |= (1<<PB6);
PORTF & = ~ ( 1 < < PF7 | 1 < < PF6 | 1 < < PF5 | 1 < < PF4 ) ;
softpwm_ocr = softpwm_ocr_buff ;
}
// LED off
if ( pwm = = softpwm_ocr ) {
//PORTB &= ~(1<<PB6);
PORTF | = ( 1 < < PF7 | 1 < < PF6 | 1 < < PF5 | 1 < < PF4 ) ;
}
}
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# endif