ain.c

AVR典型实例.rar

/*
   LEDShow.C
   4位共阴数码管显示模拟比较器例程
*/
#include <avr/io.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 main(void)
{
	int num; /*  要显示的数字 */
	DDRC = 0xff;
	DDRA = 0xff;
	DDRD = 0xf0; // AIN0和AIN1设置为输入
	ACSR = 0x00; // 使能模拟比较器

	num = 0;
	while(1)
	{
        if((ACSR&0x20)==0x20)  // 若AIN0>AIN1,显示1
		   num = 1;
        else
		   num = 0;   // 否则显示0
		LEDShow(num);

		delay();

	}
    return 0;
}