main.c.130217150814

ATmega16-ad1602

#include"includes.h"

unsigned int adc(void)
{	 
	 unsigned int temp;
 	 DDRA&=~BIT(7);       //PA0口输入数据
	 ADMUX=0x40;
	 ADCSRA=0xC6;
	 while(!(ADCSRA&(BIT(4))));//查询方式
	 temp=ADCL;
	 temp=temp+ADCH*256;
	 ADCSRA|=BIT(4);
	 return temp;
}
     
	
	 

//主函数
void main()
{	
	unsigned char *value = "0.000 V";	
	unsigned int addata;
	float j;
	unsigned int count;
	unsigned int Vref=50000;
	
	LCD_INIT();
	LCD_DisplayString(2,1,value);  
	while(1)
	{
	 addata=adc();
	 j = (float)(((float)((Vref/1024)))*addata)/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_DisplayString(2,1,value);  
	  
	}
}