ECTE333-Lecture-11-Code.zip_open

// ECTE333 - Digital Hardware 2 - Spring session // C interrupt-driven program for ATmega16 that perform ADC // To test on STK500 board // connect Port B to LEDs // connect pin A.0 (ADC0) to the analogue signal // connect pin GRD of port A to GRD for the analogue signal // Written by Lam Phung [phung@uow.edu.au] #include<avr/io.h> #include <avr/interrupt.h> volatile unsigned char result; ISR(ADC_vect){ // Read the top 8 bits, and store in result result = ADCH; } int main (void){ DDRB = 0xFF; // set port B for output // Configure the ADC module of the ATmega16 ADMUX = 0b01100000; // REFS1:0 = 01 -> AVCC as reference, // ADLAR = 1 -> Left adjust // MUX4:0 = 00000 -> ADC0 as input ADCSRA = 0b10001111; // ADEN = 1: enable ADC, // ADSC = 0: don't start conversion yet // ADATE = 0: diable auto trigger, // ADIE = 1: enable ADC interrupt // ASPS2:0 = 002: prescaler = 2 sei(); // enable interrupt system globally while(1){ // main loop // Start conversion by setting flag ADSC ADCSRA |= (1 << ADSC); PORTB = ~result; } return 0; }