#include <reg51.h>
sbit dac_cs = P2^0; //这是dac0832的控制端
sbit sanj = P3^7; //这是一个按钮
sbit zhengx = P3^6; //这是一个按钮
sbit juc = P3^5; //这是一个按钮
int san = 0; //三角波的控制产生端
int ju = 0; //锯齿波的控制产生端
int zheng = 0; //正弦波的控制产生端
unsigned char value = 0; //这是一个全局变量
unsigned char code SineData[256]={
0x7F,0x82,0x85,0x88,0x8B,0x8F,0x92,0x95,0x98,0x9B,0x9E,0xA1,0xA4,0xA7,0xAA,0xAD //这是正弦函数对应的值
,0xB0,0xB3,0xB6,0xB8,0xBB,0xBE,0xC1,0xC3,0xC6,0xC8,0xCB,0xCD,0xD0,0xD2,0xD5,0xD7
,0xD9,0xDB,0xDD,0xE0,0xE2,0xE4,0xE5,0xE7,0xE9,0xEB,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4
,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFB,0xFC,0xFD,0xFD,0xFE,0xFE,0xFE,0xFE,0xFE
,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFD,0xFD,0xFC,0xFB,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6
,0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEB,0xE9,0xE7,0xE5,0xE4,0xE2,0xE0,0xDD,0xDB
,0xD9,0xD7,0xD5,0xD2,0xD0,0xCD,0xCB,0xC8,0xC6,0xC3,0xC1,0xBE,0xBB,0xB8,0xB6,0xB3
,0xB0,0xAD,0xAA,0xA7,0xA4,0xA1,0x9E,0x9B,0x98,0x95,0x92,0x8F,0x8B,0x88,0x85,0x82
,0x7F,0x7C,0x79,0x76,0x73,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x54,0x51
,0x4E,0x4B,0x48,0x46,0x43,0x40,0x3D,0x3B,0x38,0x36,0x33,0x31,0x2E,0x2C,0x29,0x27
,0x25,0x23,0x21,0x1E,0x1C,0x1A,0x19,0x17,0x15,0x13,0x12,0x10,0x0F,0x0D,0x0C,0x0A
,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x03,0x02,0x01,0x01,0x00,0x00,0x00,0x00,0x00
,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x05,0x06,0x07,0x08
,0x09,0x0A,0x0C,0x0D,0x0F,0x10,0x12,0x13,0x15,0x17,0x19,0x1A,0x1C,0x1E,0x21,0x23
,0x25,0x27,0x29,0x2C,0x2E,0x31,0x33,0x36,0x38,0x3B,0x3D,0x40,0x43,0x46,0x48,0x4B
,0x4E,0x51,0x54,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x73,0x76,0x79,0x7C};
/*************延时函数************/
void delay_1us(unsigned char xx)
{
while(xx--) ;
}
/*************延时函数结束************/
/*************波形产生函数************/
void sanjiao() //这是一个产生三角波的函数
{
int a = 0;
value = 0;
for(a = 0;a < 255; a ++)
{
P1 = value;
value++;
delay_1us(1);
}
value = 255;
for(a = 255;a > 0;a --)
{
P1 = value;
value--;
delay_1us(1);
}
}
void juchi() //这是一个产生锯齿波的函数
{
int a = 0;
for(a = 0;a < 255; a ++)
{
P1 = value;
value++;
delay_1us(1);
}
}
void zhengxian() //这是一个产生正弦波的函数
{
int a = 0;
for(a = 0;a < 255; a ++)
{
P1 = SineData[value];
value++;
delay_1us(1);
}
}
/*************波形产生函数结束************/
/*************波形判断函数************/
void panduan()
{
if(sanj == 0) //如果按钮按下，关闭正弦波和锯齿波输出，使三角波控制端有值
{
delay_1us(1000); //这是一个消抖延时
if(sanj == 0)
{
while(sanj==0) ;
san = ~san;
ju = zheng = 0;
}
}
if(juc == 0) //如果按钮按下，关闭三角波和正弦波的输出，使锯齿波控制端有值
{
delay_1us(1000); //这是一个消抖延时
if(juc == 0)
{
while(juc==0) ;
ju = ~ju;
san = zheng = 0;
}
}
if(zhengx == 0) //如果按钮按下关闭三角波和锯齿波的输出，使正弦波控制端有值
{
delay_1us(1000); //这是一个消抖延时
if(zhengx == 0)
{
while(zhengx==0) ;
zheng = ~zheng;
san = ju = 0;
}
}
if(ju) juchi(); // 判断控制端，使输出
else if(san) sanjiao(); // 判断控制端，使输出
else if(zheng) zhengxian(); // 判断控制端，使输出
}
/*************波形判断函数结束************/
void main()
{
dac_cs = 0;
for(;;)
{
panduan(); //执行判断函数
}
}
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