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
   9 int main(void)
  10 {
  11         char seen = 0;
  12
  13         TCCR1C = _BV(COM1D0) | _BV(COM1D1) | _BV(PWM1D);
  14         TCCR1A = _BV(PWM1A) | _BV(PWM1B);
  15         TCCR1B = 0x80| _BV(CS13) | _BV(CS11);
  16         TC1H  = 0x03;
  17         OCR1C = 0xFF;
  18         OCR1D = 0x20;
  19         TCNT1 = 0;
  20         DDRB |= _BV( PB5 );
  21         PORTB &= ~_BV( PB5 );
  22
  23         ADCSRA = _BV(ADEN) | _BV(ADATE) | _BV(ADPS1) | _BV(ADPS0);
  24         ADMUX = _BV(REFS1) | _BV(MUX0);
  25         // ADCSRB = _BV(REFS2);
  26         DIDR0 = _BV(ADC1D) | _BV(AREFD);
  27
  28         while (1) {
  29                 uint16_t pwm;
  30                 unsigned char pwmhi, pwmlo;
  31
  32                 ADCSRA |= _BV(ADSC);
  33
  34                 _delay_ms(100);
  35
  36                 pwm = ADCW;
  37                 if (!seen) {
  38                         seen = 1;
  39                         eeprom_write_word(&pwmee, pwm);
  40                 }
  41                 if (pwm > 0x3C0)
  42                         pwm = 0x3C0;
  43                 if (pwm < 1)
  44                         pwm = 1;
  45                 pwmhi = pwm >> 8;
  46                 pwmlo = pwm & 0xFF;
  47
  48                 TC1H = pwmhi;
  49                 OCR1D = pwmlo;
  50         }
  51
  52         sleep_mode();
  53     DDRA |= _BV( PA0 );
  54     while( 1 ) {
  55         PORTA |=  _BV( PA0 );
  56         _delay_ms(2000);
  57         PORTA &=~ _BV( PA0 );
  58         _delay_ms(2000);
  59     }
  60 }