[En-Nut-Discussion] analog input

[Sigurd Kleppan]

Hello!
You can use following code, but i don't know how to set the pin you want to read on PORTF. Someone how knows? Is it just to set the variable chan to example "1" for PIN1 on PORTF????

I have not tried this code...
Someone who has???



#include <io.h>

void ADCSetup(void)
{
// for ATMEGA128
/*
	REFS1 = 1; // Use internal 2.56V REF
	REFS0 = 1;
	ADLAR = 0;
	ADEN = 1;	// AD converter on
*/
	ADCSRA = 0x97;
	ADMUX = 0xC0;
}

int ADConvert(short chan)
{
	int tmp;
	int ADresult;
	tmp = ADMUX & ~0x07;
	tmp |= chan & 0x7;
	ADMUX = tmp;						// Set
channel
	// maybe delay a little here to settle the MUX
	sbi(ADCSRA,ADSC);
// Start ADC	
	loop_until_bit_is_set(ADCSRA, ADIF);	// Wait for ADIF, will
happen soon
	ADresult = ADCL;				// Read LSB
first
	ADresult |= ((int)ADCH) << 8;	// then MSB
	sbi(ADCSRA,ADIF);
// Clear AD Interrupt Flag

	return ADresult;
}



tomek w <twojcikpl at yahoo.com> skrev:

>hi
>what is the easiest way to programm analog input
>any ideas???
>
>
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