adc.c

AD9850 DDS chip driver

/*

 PIC16F877 ADC driver Juha Niinikoski 24.4.2002
 

*/


//*****************************************
// Convert one chanel returns integer value
// chnum selects chanell
//*****************************************

int convert_adc(unsigned char chnum)
{
	union
	{
	int i;
	unsigned char adcregs[2];
	} adcresult;
	unsigned char temp;


	temp = ADCON0 & 0b11000101;
	ADCON0 = temp | (chnum << 3);
	udelay(250);
	ADGO = 1;
	asm("nop");
	while (ADGO)
		;

	adcresult.adcregs[0]=ADRESL;
	adcresult.adcregs[1]=ADRESH;

	return adcresult.i;
}