test/adc_test.c

   1 #include <avr/io.h>
   2 #include <avr/interrupt.h>
   3 #include <stdio.h>
   4 #include "adio.h"
   5
   6 ISR(SIG_ADC) {
   7         static volatile uint16_t last = 0;
   8         if( (ADCSRA & _BV(ADSC)) != 0 ) {
   9                 last = 1;
  10         }
  11
  12         last = ADC;
  13 }
  14
  15 int main(void) {
  16         init_adc();
  17
  18         int8_t i;
  19         uint16_t sum = 0;
  20         for(i = 0; i < 5; ++i)
  21                 sum += analogRead(i);
  22
  23         if( sum == 0 )
  24                 PORTB |= PB1;
  25
  26         ADMUX = (ADMUX & ~0x7) | 2;
  27         ADCSRA |= (_BV(ADFR) | _BV(ADIE));
  28         sei();  // enable interrupts
  29         ADCSRA |= _BV(ADSC);
  30
  31         return 0;
  32 }
  33
  34 void io_init() {
  35         DDRB = 0xB9;              // spi_clk, spi_in, spi_out, NC, TX, RX, clock in, clock
  36         PORTB = 0x02;
  37
  38         DDRC = 0xFF;              // Address
  39         PORTC = 0x00;
  40
  41         DDRD = 0xFA;              // NC, NC, NC, NC, NC, CAN_INT, MIDI TX & RX
  42         PORTD = 0x00;
  43 }
  44