lights.c

   1 #include <avr/io.h>
   2 #include <avr/eeprom.h>
   3 #include <util/delay.h>
   4 #include <avr/sleep.h>
   5 #include <avr/interrupt.h>
   6
   7 uint16_t pwmee EEMEM;
   8 volatile uint16_t adcval;
   9
  10 volatile struct
  11 {
  12   uint8_t tmr_int: 1;
  13   uint8_t adc_int: 1;
  14   uint8_t rx_int: 1;
  15 }
  16 intflags;
  17
  18
  19 unsigned char debug EEMEM = 1;
  20
  21 ISR(ADC_vect)
  22 {
  23         adcval = ADCW;
  24         ADCSRA &= ~_BV(ADIE);         /* disable ADC interrupt */
  25         intflags.adc_int = 1;
  26 }
  27
  28 ISR(TIMER1_OVF_vect)
  29 {
  30         TIMSK &= ~_BV(TOIE1);
  31         intflags.tmr_int = 1;
  32 }
  33
  34 int main(void)
  35 {
  36         char seen = 0;
  37
  38         TCCR1C = _BV(COM1D0) | _BV(COM1D1) | _BV(PWM1D);
  39         TCCR1A = _BV(COM1A0) | _BV(COM1A1) | _BV(COM1B0) | _BV(COM1B1) | _BV(PWM1A) | _BV(PWM1B);
  40         TCCR1B = 0x80| _BV(CS13) | _BV(CS10);
  41         TC1H  = 0x03;
  42         OCR1C = 0xFF;
  43         OCR1D = OCR1B = OCR1A = 0x40;
  44         TCNT1 = 0;
  45         DDRB |= _BV( PB5 ) | _BV( PB1 ) | _BV( PB3 );
  46         PORTB &= ~(_BV( PB5 ) | _BV( PB1 ) | _BV( PB3 ));
  47         TIMSK = _BV(TOIE1);
  48
  49         ADCSRA = _BV(ADEN) | _BV(ADATE) | _BV(ADPS1) | _BV(ADPS0);
  50         ADMUX = _BV(REFS1) | _BV(MUX0);
  51         // ADCSRB = _BV(REFS2);
  52         DIDR0 = _BV(ADC1D) | _BV(AREFD);
  53
  54         sei();
  55         while (1) {
  56                 unsigned char pwmhi, pwmlo;
  57
  58                 if (intflags.adc_int) {
  59                         intflags.adc_int = 0;
  60
  61                         if (adcval > 0x3C0)
  62                                 adcval = 0x3C0;
  63                         if (adcval < 1)
  64                                 adcval = 1;
  65                         pwmhi = adcval >> 8;
  66                         pwmlo = adcval & 0xFF;
  67
  68                         TC1H = pwmhi;
  69                         OCR1D = pwmlo;
  70
  71                         TC1H = pwmhi;
  72                         OCR1B = pwmlo;
  73
  74                         TC1H = pwmhi;
  75                         OCR1A = pwmlo;
  76
  77                         TIMSK |= _BV(TOIE1);
  78                 }
  79
  80                 if (intflags.tmr_int) {
  81                         intflags.tmr_int = 0;
  82                         ADCSRA |= _BV(ADIE) | _BV(ADSC);
  83                 }
  84
  85                 sleep_mode();
  86
  87 #if 0
  88                 if (!seen) {
  89                         seen = 1;
  90                         eeprom_write_byte(&debug, 2);
  91                 }
  92 #endif
  93         }
  94
  95     DDRA |= _BV( PA0 );
  96     while( 1 ) {
  97         PORTA |=  _BV( PA0 );
  98         _delay_ms(2000);
  99         PORTA &=~ _BV( PA0 );
 100         _delay_ms(2000);
 101     }
 102 }