adc.c.130216190908

ATmega16-ad1602

#define ADC_C
#include "includes.h"
/******************************************************************************/
/******************************************************************************/
unsigned int ad_result(void)
{
     unsigned int addata;
	 addata=ADCL;
	 addata=addata+ADCH*256;
	 return addata;
	 
}   

void init_adc(void)
{	
	DDRA&=~BIT(PA0);
	PORTA&=~BIT(PA0);
    ADCSRA = 0x00; 
    ADMUX =0x40;  			             //AVCC,AREF引脚加滤波电容,单端输入ADC0
    ADCSRA=(1<<ADEN)|(1<<ADSC)|(1<<ADIE)|(1<<ADPS2)|(1<<ADPS1) ;//64分频
}

/******************************************************************************/

/******************************************************************************/
 //ADC完成中断
//#pragma vector = interrupt_handler adc_isr:iv_ADC  
// define the interrupt handler

#pragma vector=ADC_vect
__interrupt void adc_isr(void)
{
    ad_result();
	ADMUX =(adc_mux&0x1f)|(1<<REFS0);
    ADCSRA|=(1<<ADSC);//启动AD转换
}