#include "reg52.h"

#include "iic.h"

#define TSMG 500

#define uchar unsigned char?

#define?uint unsigned int

#define PCF8591 0x90

uchar dat=0;

sbit S4=P3^3;

sbit P2_0=P2^0;

sbit P2_1=P2^1;

uchar D[32];

double dianya;

uchar code smg1[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x80,0xc0,0xc6,0x86,0x8e,0xbf,0x7f};

uchar code smg2[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

uint smg_vlot=0;

uchar adc_value=0;

float adc_vlot=0;

uchar mode=1;

uchar stat_smg=1;

uchar control;

uchar shi,ge,bai;

void Hc573(uchar channel,uchar dat)

{

P0=dat;

switch(channel)

{

case 0:

P2=P2&0x1f|0x00;

break;

case 4:

P2=P2&0x1f|0x80;

break;

case 5:

P2=P2&0x1f|0xa0;

break;

case 6:

P2=P2&0x1f|0xc0;

break;

case 7:

P2=P2&0x1f|0xe0;

break;

}

P2=P2&0x1f|0x00;

}

void delay(uint t)

{

while(t--);

}

void smgsm(uchar pos,uchar date)

{

Hc573(6,0x01<<pos);

Hc573(7,date);

delay(TSMG);

Hc573(6,0x01<<pos);

Hc573(7,0xff);

}

void smgall(uchar date)

{

Hc573(6,0xff);

Hc573(7,date);

}

void smglook()

{

smgsm(7,smg1[ge]);

smgsm(6,smg1[shi]);

smgsm(5,smg2[bai]);

smgsm(4,0xff);

smgsm(3,0xff);

smgsm(2,0xbf);

smgsm(1,smg1[mode]);

smgsm(0,0xbf);

}

bit write(uchar sls,uchar c)

{

IIC_Start();

IIC_SendByte(sls);??

IIC_WaitAck();

IIC_SendByte(c);?

IIC_WaitAck();

IIC_Stop();?

return(1);

}

uchar read(uchar sls)

{

IIC_Start();

IIC_SendByte(sls+1);?

IIC_WaitAck();

dat=IIC_RecByte();?

IIC_SendAck(1);?

IIC_Stop();?

return dat;

}

void key()

{

if(S4==0)

{

delay(TSMG);

if(S4==0)

{

if(mode==1)

{

mode=2;

control=0x00;

Hc573(4,~(0x02));

}

else if(mode==2)

{

mode=3;

control=0x03;

Hc573(4,~(0x04));

}

else if(mode==3)

{

control=0x01;

mode=1;

Hc573(4,~(0x01));

}

while(S4==0)

{

smglook();

}

}

}

}

void Init_sys()

{

Hc573(0,0x00);

Hc573(4,0xfe);

Hc573(5,0x00);

smgall(0xff);

}

void main()

{

Init_sys();

while(1)

{

write(PCF8591,control);

D[0]=read(PCF8591);

dianya=(double)D[0];

dianya=(dianya*500/255);

ge=(int)dianya%10;

shi=(int)dianya/10%10;

bai=(int)dianya/100;

key();

smglook();

}

}