68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
|
|
* opdracht 4.b1.c
|
|
*
|
|
* Created: 3-3-2021 10:54:49
|
|
* Author : Sem
|
|
*/
|
|
|
|
/************************************************************************/
|
|
/* Verander het programma (voor kanaal 3 en voor 8 bits) zodat het alleen een AD-conversie uitvoert
|
|
als jij dat wilt, dus op aanvraag. Maak daarvoor in main() een eindeloze lus met een wachtfunctie
|
|
en een start voor de ADC (Zie ook code in de repository). */
|
|
/************************************************************************/
|
|
|
|
|
|
#define F_CPU 10e6
|
|
#include <avr/io.h>
|
|
#include <util/delay.h>
|
|
#include <avr/interrupt.h>
|
|
|
|
#define BIT(x) (1 << (x))
|
|
|
|
// wait(): busy waiting for 'ms' millisecond
|
|
// Used library: util/delay.h
|
|
void wait( int ms )
|
|
{
|
|
for (int tms=0; tms<ms; tms++)
|
|
{
|
|
_delay_ms( 1 ); // library function (max 30 ms at 8MHz)
|
|
}
|
|
}
|
|
|
|
|
|
// Initialize ADC: 10-bits (left justified), no free running
|
|
void adcInit( void )
|
|
{
|
|
sei(); // enable interrupts
|
|
ADMUX = 0b01100011; // AREF=VCC, result left adjusted, channel3 at pin PF3
|
|
ADCSRA = 0b10001110; // ADC-enable, start conversion mode, no free running, interrupt enable
|
|
}
|
|
|
|
/************************************************************************/
|
|
/* starts AD converstion by setting bit 6 in ADCSRA to 1 */
|
|
/************************************************************************/
|
|
void startConversion(void) {
|
|
ADCSRA |= BIT(6);
|
|
}
|
|
|
|
|
|
// Main program: ADC at PF1
|
|
int main( void )
|
|
{
|
|
DDRF = 0x00; // set PORTF for input (ADC)
|
|
DDRA = 0xFF; // set PORTA for output
|
|
DDRB = 0xFF; // set PORTB for output
|
|
adcInit(); // initialize ADC
|
|
|
|
while (1)
|
|
{
|
|
PORTB = ADCL; // Show MSB/LSB (bit 10:0) of ADC
|
|
PORTA = ADCH;
|
|
|
|
startConversion();
|
|
wait(100); // every 100 ms (busy waiting)
|
|
}
|
|
}
|
|
|
|
|