10_4.c

单片机P1口与4个按键连接

/*  【例10-4】要求在图10-2输出端输出正弦波电压，产生频率随意，峰峰值为5V。*/

//用C语言编程，程序如下：
#include <reg51.h>
//#include <absacc.h>
//#define da0832 XBYTE[0x7fff]
#define uchar unsigned char
uchar xdata da0832 _at_ 0x7fff;
uchar dot[36]={0x80,0x96,0xab,0xbf,0xd2,0xe2,0xee,0xf8,0xfe,	//正弦波数据
               0xff,0xfe,0xf8,0xee,0xe2,0xd2,0xc0,0xab,0x96,
               0x80,0x69,0x54,0x40,0x2d,0x1e,0x11,0x7 ,0x1 ,
               0x0 ,0x1 ,0x7 ,0x10,0x1d,0x2d,0x3f,0x53,0x69};
main()
{	unsigned char i,j;
	while(1)
	{	for(i=0;i<36;i++)
		{	da0832=dot[i];			/*输出数据，启动转换*/
			for(j=0;j<150;j++);		/*延时*/
		}
	}
}