adc.c

AVR典型实例.rar

#define F_CPU 4000000UL
#include <avr/io.h>
#include <avr/delay.h>

#define uchar8 unsigned char

const uchar8 LedNum[] ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delay()
{
	int i;
	for(i=0;i<600;i++)
		;
}

void LEDShow(int num)
{
	uchar8 i,tmp,curnum;
	int tmpnum;

		tmp = 0xef;
		tmpnum = num;
		for(i=0;i<4;i++)
		{	
			curnum = tmpnum % 10;
			tmpnum = tmpnum / 10;
			PORTA = tmp;
			PORTC = LedNum[curnum];
			delay();
			tmp = (tmp << 1) + 0x1;
		}

}
int Adc_Convert(void)  // A/D转换函数，10位精度
{
      int tmp1,tmp2;
	  tmp1 = ADCL;
	  tmp2 = ADCH;
	  tmp1 = tmp1+(tmp2<<8);
	  return tmp1;
}
int main(void)
{
	int num; /*  要显示的数字 */

	DDRC = 0xff;
	DDRA = 0xff;
	ADMUX = 0x00;  // ADC，0通道
    ADCSRA = 0xe6;  // 125K转换速率，自由转换模式，启动AD转换器
	_delay_ms(3000);
	num = 0;
	while(1)
	{
		num = Adc_Convert();
		LEDShow(num);
		delay();

	}
    return 0;
}