fork(1) download 
  1. #include <avr/io.h>
  2. #include <avr/interrupt.h>
  3. #include <avr/sleep.h>
  4. #include <util/delay.h>
  5.  
  6. enum {
  7.   setpoint = 13ll * 10230ll * 11ll / 2000ll
  8. };
  9.  
  10. static void setup_adc(void) {
  11.   ADMUX |= (1 << REFS1) | (1 << MUX1);
  12.   ADCSRA |= (1 << ADEN) | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
  13. }
  14.  
  15. static void setup_pwm(void) {
  16.   PLLCSR |= (1 << PCKE);
  17.   _delay_us(100);
  18.   DDRB |= (1 << PB1);
  19.   OCR1C = 0xff;
  20.   TCCR1 |= (1 << PWM1A) | (1 << COM1A1) | (1 << CS10);
  21.   TIMSK |= (1 << TOIE1);
  22. }
  23.  
  24. static int read_adc(void) {
  25.   ADCSRA |= (1 << ADSC);
  26.   while (!(ADCSRA & (1 << ADIF)));
  27.   ADCSRA &= ~(1 << ADIF);
  28.   return ADC;
  29. }
  30.  
  31. static int oversample(void) {
  32.   int reading = 0;
  33.   reading += read_adc();
  34.   reading += read_adc();
  35.   reading += read_adc();
  36.   reading += read_adc();
  37.   return reading / 4;
  38. }
  39.  
  40. ISR(TIM1_OVF_vect) {
  41.   int reading = oversample();
  42.   if (reading < setpoint) {
  43.     OCR1A += (OCR1A == OCR1C ? 0 : 1);
  44.   } else if (reading > setpoint) {
  45.     OCR1A -= (OCR1A == 0 ? 0 : 1);
  46.   }
  47. }
  48.  
  49. int main(void) {
  50.   setup_adc();
  51.   setup_pwm();
  52.   sei();
  53.   for (;;) {
  54.     sleep_mode();
  55.   }
  56.   return 0;
  57. }
  58.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.c:1:20: fatal error: avr/io.h: No such file or directory
 #include <avr/io.h>
                    ^
compilation terminated.
stdout 
Standard output is empty
https://ideone.com/SD7jvy
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!