51单片机产生锯齿波，方波，三角波，正弦波，AD/DA转换实验

利用DAC0808进行DA转换，利用ADC0832进行AD转换

右上角两个按钮INT1和CHANGE

运行之后，程序处于待机状态，点击change按钮进行AD和DA切换，在DA实验中，INT1进行波形切换，有三角波，方波，锯齿波，正弦波。

#include 
#include 

#define DAC XBYTE[0x7FFF]

unsigned int u ;
unsigned int a,b,c,d,t,p,A1,A2;
unsigned char VOL=0;

unsigned char code sin[]={
127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,179,182,184,187,190,193,195,198,200,203,205,208,210,
213,215,217,219,221,224,226,228,229,231,233,235,236,238,239,241,242,244,245,246,247,248,249,250,251,251,252,253,253,254,
254,254,254,254,255,254,254,254,254,254,253,253,252,251,251,250,249,248,247,246,245,244,242,241,239,238,236,235,233,231,
229,228,226,224,221,219,217,215,213,210,208,205,203,200,198,195,193,190,187,184,182,179,176,173,170,167,164,161,158,155,
152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,78,75,72,70,67,64,61,59,56,54,51,
49,46,44,41,39,37,35,33,30,28,26,25,23,21,19,18,16,15,13,12,10,9,8,7,6,5,4,3,3,2,1,1,0,0,0,0,0,0,0,0,0,0,0,1,1,2,3,3,4,
5,6,7,8,9,10,12,13,15,16,18,19,21,23,25,26,28,30,33,35,37,39,41,44,46,49,51,54,56,59,61,64,67,70,72,75,78,81,84,87,90,93,
96,99,102,105,108,111,115,118,121,124
};
unsigned char code juchi[]={
0,4,8,12,16,20,24,28,32,36,40,45,49,53,57,61,65,69,73,77,81,85,89,93,97,101,105,109,113,117,121,125,130,134,138,142,
146,150,154,158,162,166,170,174,178,182,186,190,194,198,202,206,210,215,219,223,227,231,235,239,243,247,251,255
};
unsigned char code sanjiao[]={
0,8,16,24,32,40,48,56,64,72,80,88,96,104,112,120,128,136,144,152,160,168,176,184,192,200,208,216,224,232,240,248,
248,240,232,224,216,208,200,192,184,176,168,160,152,144,136,128,120,112,104,96,88,80,72,64,56,48,40,32,24,16,8,0
};
unsigned char code fangbo[]={
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,
200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200
};

unsigned char Distab[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

void Delay(int xms){while(xms--){unsigned char i, j;i = 2;j = 239;do{while (--j);} while (--i);}}

void smgca(locating,number){
		switch(locating)
		{
			case 1:P2=0x01;break;
			case 2:P2=0x02;break;
			case 3:P2=0x04;break;
			case 4:P2=0x08;break;
		}
	  switch(number)
		{
			case 0:P0 = 0xC0;break;case 1:P0 = 0xF9;break;
			case 2:P0 = 0xA4;break;case 3:P0 = 0xB0;break;
			case 4:P0 = 0x99;break;case 5:P0 = 0x92;break;
			case 6:P0 = 0x82;break;case 7:P0 = 0xF8;break;
			case 8:P0 = 0x80;break;case 9:P0 = 0x90;break;
}
		Delay(3);
		P0 = 0xFF;
}

void ADC(){
	P3_0=0;
	P3_0=1;
	Delay(5);
	P3_0=0;
	while(P3_7==0);
	P3_1 = 1;
	VOL = P1;
	P3_1 = 0;
}
void show(){
	unsigned t1,t2,t3,t4;
	t1 = VOL/51;
	t2 = (VOL%51)*10/51;
	t3 = ((((VOL%51)*10)%51)*10+25)/51;
	t4 = ((((((VOL%51)*10)%51)*10+25)%51)*10)/51-4;
	
	if(t3>9){t3=9;}
	if(t3<0){t3=0;}
	if(t4>9){t4=9;}
	if(t4<0){t4=0;}
	
	P2 = 0x01;
	P0 = Distab[t1];
	Delay(3);
	P2 = 0x00;
	P0 = 0xFF;

	smgca(2,t2);
	smgca(3,t3);
	smgca(4,t4);
}
void fangb(){
	while(a){
		for(u=0;u<100;u++){
			DAC = fangbo[u];
		}
	}
}
void sinb(){
	while(b){
		for(u=0;u<256;u++){
			DAC = sin[u];
		}
	}
}
void juchib(){
	while(c){
		for(u=0;u<64;u++){
			DAC = juchi[u];
		}
	}
}
void sanjiaob(){
		while(d){
		for(u=0;u<64;u++){
			DAC = sanjiao[u];
		}
	}
}
void INT1main() interrupt 2{
	switch(t){
		case 0 : {a=1;b=0;c=0;d=0; t++;break;}
		case 1 : {a=0,b=1,c=0,d=0; t++;break;}
		case 2 : {a=0,b=0,c=1,d=0; t++;break;}
		case 3 : {a=0,b=0,c=0,d=1; t++;break;}
	}	
	if(t>3){t=0;}
}

void INT0main() interrupt 0{
		switch(p){
		case 0 : {a=0;b=0;c=0;d=0;A1=1;A2=0; p++;break;}
		case 1 : {a=0,b=0,c=0,d=0;A1=0;A2=1; p++;break;}
	}	
	if(p>1){p=0;}
}

void main(){
	EA  = 1;
	EX0 = 1;
	IT0 = 1;
	EX1 = 1;
	IT1 = 1;
	
	while(1){
		while(A1){
			fangb();
			sinb();
			juchib();
			sanjiaob();
		}
		while(A2){
			ADC();
			show();
		}
	}
}