tone.c

单片机进行模数转换成电流后再转换为电压

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit dacs=P1^7;
sbit dawr=P3^6;
void delay(uint x,uint y)
{
	uint i,j;
	for(i=x;i>0;i--)
	for(j=y;j>0;j--);
}
void main()
{
	while(1)
	{
	uchar i;
	for(i=0;i<255;i++)
	{
		dawr=~dawr;
		delay(3,50);
	}
	delay(200,110);
		for(i=0;i<255;i++)
	{
		dawr=~dawr;
		delay(3,50);
	}
	}
}