adc.c.130216200218

ATmega16-ad1602

#define ADC_C
#include "includes.h"

/******************************************************************************/
/******************************************************************************/
unsigned char  adc_mux = 0x00;//选择通道:ADC0

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 =(1<<REFS0)|(adc_mux&0x1f);  	 //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 interrupt_handler adc_isr:15  
void adc_isr(void)
{  
    ad_result();
	    j = (float)(((float)((Vref/1023)))*ad_result())/1000.00;
	    count = j*100;					
        value[0] = count /1000+0x30;
        count = count %1000;
        value[2] = count /100+0x30;
        count = count %100;
        value[3] = count  /10 + 0x30;			 
        value[4] = count  %10 + 0x30;			 
      
        LCD_Cursor(0,1);
        LCD_DisplayString(2,1,value);  
               
        delay_nms(1000);          
	ADMUX|=(adc_mux&0x1f)|(1<<REFS0);
    ADCSRA|=(1<<ADSC);//启动AD转换
}