adc.c

来自「车载NI_MH快速充电器」· C语言 代码 · 共 60 行

/********************************************************************************/
//		
// 		builder : 2007-04-10
// 		Target  : ATMEAG 48V
// 		Crystal : 内部 8.00 MHz
//
//		ADC 转换模块
		
/********************************************************************************/

#include <avr/io.h>
#include <avr/delay.h>
#include <avr/signal.h>
#include <avr/interrupt.h>


#define		uchar	unsigned char
#define		uint	unsigned int


void adc_int(void)
{
	 ADMUX	= 0x40;		//set adc power avcc and the ref is Avref
 	 ADCSRA	= 0xC7; 	//enable adc and the div parame is 8	 
}


/*---------------------------------------------------------------
   			ADC 
----------------------------------------------------------------*/

uint adc_colect(uchar chanal)
{
 	uchar i;
	uint  ad_add;
	uint  temp,temp1;
	uint  adh;
	
	ADMUX = ADMUX & 0xf0 | chanal;
	
	ad_add = 0;
	
	for(i=0;i<16;i++)
	{
 		ADCSRA = ADCSRA|(1<<ADSC);			   //start the adc
		while(ADCSRA&(1<<ADSC));			   //wait for the adc finish
 		
 		ADCSRA = ADCSRA|(1<<ADSC);			   //start the adc
		while(ADCSRA&(1<<ADSC));			   //wait for the adc finish
		
		temp1 = ADCL;
		temp  = (ADCH&0x03)<<8;
		temp   += temp1;
		ad_add += temp;                                                                      
	}
	adh = ad_add>>4;
	return(adh);
}