DA轉(zhuǎn)換-15~15v電壓源設(shè)計

#include

#include

#include

#define uchar unsigned char

#define uint unsigned int

float num=51;

float temp;

uchar val;

uchar aa[4];

unsigned char code disp_code[]={

0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,

0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf,0xff};//數(shù)碼管顯示

/**********************************************************

延時子函數(shù)

**********************************************************/

void delayms(uint ms)

{

uchar t;

while(ms--)

{

for(t = 0; t < 120; t++);

}

}

/******************************************************************

函數(shù)功能：顯示計數(shù)次數(shù)的子程序

入口參數(shù)：x

********************************************************************/

void Display(void)

{ uchar i;

P2=0xfe ;

for(i=0;i<4;i++)

{ P1=disp_code[aa[i]];

if(P2==0xfb)

P1=disp_code[aa[i]]&0x7f;

delayms(5);

P2=_crol_(P2,1);

}

}

/*******************************************

函數(shù)功能：主函數(shù)

******************************************/

void main(void)

{

EA=1; //開放總中斷

EX0=EX1=1; //允許使用外中斷

IT0=IT1=1; //選擇負跳變來觸發(fā)外中斷

temp=num/8.5;

val=(uchar)temp;

if(val<15)

{aa[0]=16;val=15-val;}

else {aa[0]=17;val=val-15;}

aa[1]=val/10;

if (aa[1]==0)

aa[1]=17;

aa[2]=val%10;

aa[3]=0;

P0=(uchar)num;

while(1)

Display();

}

void int0(void) interrupt 0 //外中斷0的中斷編號為0

{

if(num==0)

num=num+8.5;

num=num-8.5;

temp=num/8.5;

val=(uchar)temp;

if(val<15)

{aa[0]=16;val=15-val;}

else {aa[0]=17;val=val-15;}

aa[1]=val/10;

if (aa[1]==0)

aa[1]=17;

aa[2]=val%10;

aa[3]=0;

}

void int1(void) interrupt 2 //外中斷1的中斷編號為0

{

if(num==255)

num=num-8.5;

num=num+8.5;

temp=num/8.5;

val=(uchar)temp;

if(val<15)

{aa[0]=16;val=15-val;}

else {aa[0]=17;val=val-15;}

aa[1]=val/10;

if (aa[1]==0)

aa[1]=17;

aa[2]=val%10;

aa[3]=0;

P0=(uchar)num;

}