数字电压表

#include sbit ADCLK=P1^5;

sbit ADDAT=P1^6;

sbit ADCS=P1^4; unsigned char ADTEMP;

int t1,t2,t3;

unsigned char TABNU[16]={0xc0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8, 0x80,0x90,0x88,0x83,0xC6,0x0A1,0x86,0x8E

};

void ADCONV(void); void TUNBCD(void);

void ADPLAY(void);

void DELAY2MS(void); void main()

{

ADTEMP=0x00; P0=0XFF;

P2=0XFF;

while(1) { int i;

ADCONV();

for(i=10;i>0;i--)

{

TUNBCD();

ADPLAY();

} }

}

void ADCONV(void) { int i;

ADCS=1;

ADCLK=0; ADCS=0;

ADDAT=1;

ADCLK=1; ADDAT=0;

ADCLK=0;

ADDAT=1; ADCLK=1;

ADDAT=0;

ADCLK=0; ADDAT=0;

ADCLK=1;

ADDAT=1;

ADCLK=0; _nop_();

_nop_();

ADCLK=1; for(i=8;i>0;i--)

{ ADCLK=0;

ADTEMP|=ADDAT; ADTEMP<<=1;

if(i==7)

ADTEMP|=ADDAT; ADCLK=1;

}

ADCS=1; }

void TUNBCD(void)

{int t;

t=ADTEMP*1.0/255*500;

t1=t%10;

t2=(t/10)%10 ; t3=(t/100%10);

}

void ADPLAY(void)

{ P2=0xff;

P0=TABNU[t1];

P2=0xfe; DELAY2MS();

DELAY2MS();

DELAY2MS(); P0=TABNU[t2];

P2=0xfd;

DELAY2MS(); DELAY2MS();

DELAY2MS();

P0=TABNU[t3]&0x7f; P2=0xfb;

DELAY2MS();

DELAY2MS(); DELAY2MS();

}

void DELAY2MS(void) {

int k;

for(k=0;k<500;k++);

}

的AD电压表程序