/*本程序使用普中開(kāi)發(fā)板調(diào)試*/
#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define addw 0x90
#define addr 0x91
sbit scl=P2^0;
sbit sda=P2^1;
sbit rs=P2^6;
sbit rw=P2^5;
sbit en=P2^7;
uchar Ch0value,Ch1value;
void delayms(int i)
{ int x,y;
for (x=i;x>0;x--)
for(y=110;y>0;y--);
}
void usdelay()
{
_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();
}
void start() //開(kāi)始信號(hào)
{//時(shí)鐘線在高電平時(shí)，數(shù)據(jù)線由高變低即為開(kāi)始信號(hào) 由高變低即為開(kāi)始信號(hào)
sda=1;
usdelay();
scl=1;
usdelay();
sda=0;//數(shù)據(jù)線由高變低即為開(kāi)始信號(hào)
usdelay();
scl=0;
}
void stop() //結(jié)束信號(hào)
{//時(shí)鐘線在高電平時(shí)，數(shù)據(jù)線由低變高即為結(jié)束信號(hào)
sda=0;
usdelay();
scl=1;
usdelay();
sda=1;
usdelay();
sda=0; //這句可有可無(wú)
scl=0; //這句可有可無(wú)
}
void ack()//應(yīng)答信號(hào)
{ uchar i;
scl=1;
usdelay();
while((sda==1)&&(i<200))i++;
scl=0;
usdelay();
}
void Noack() //不應(yīng)答
{
sda=1; //時(shí)鐘線高電平時(shí)，數(shù)據(jù)線高，即為不應(yīng)答
usdelay();
scl=1;
usdelay();
scl=0;
usdelay();
}
void send_byte(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
scl=0;
usdelay();
sda=(bit)(dat&0x80); //數(shù)據(jù)傳送是由高到低
//(bit)為強(qiáng)制轉(zhuǎn)換命令，把數(shù)據(jù)變?yōu)榉?即1的一位數(shù)據(jù)庫(kù)
usdelay();
scl=1;
usdelay();
dat<<=1;
}
scl=0;
usdelay();
sda=1;//釋放總線
usdelay();
}
uchar read_byte()
{
uchar i,k;
scl=0;
usdelay();
sda=1; //釋放總線
usdelay();
for(i=0;i<8;i++)
{
scl=1;
usdelay();
k=(k<<1)|sda;//判斷8次，移位7次
scl=0;
usdelay();
}
return k;
}
uchar read_adc(uchar channel)
{
uchar temp;
start();
send_byte(addw);
ack();
send_byte(0x40|channel);
ack();
start();
send_byte(addr);
ack();
temp=read_byte();
Noack();
stop();
return temp;
}
void init()
{
scl=1;
sda=1;
}
/*********1602程序********************/
void write_com(uchar com)
{
rs=0;
rw=0;
en=0;
P0=com;
delayms(2);
en=1;
delayms(2);
en=0;
}
void write_dat(uchar dat)
{
rs=1;
rw=0;
en=0;
P0=dat;
delayms(2);
en=1;
delayms(2);
en=0;
}
void zfc(uchar *p)
{
while(*p!=0)
write_dat(*p++);
}
void init_1602()
{
write_com(0x38);
delayms(2);
write_com(0x0c);
delayms(2);
write_com(0x06);
delayms(2);
write_com(0x01);
write_com(0x80);
zfc("Channel 0 :");
write_com(0x80+0x40);
zfc("Channel 1 :");
}
void display()
{
uchar a0,a1,a2, b0,b1,b2;
a0=Ch0value*196/10000;
a1=Ch0value*196%10000/1000;
a2=Ch0value*196%1000/100;
b0=Ch1value*196/10000;
b1=Ch1value*196%10000/1000;
b2=Ch1value*196%1000/100;
write_com(0x80+11);
write_dat(0x30+a0);
write_dat('.');
write_dat(0x30+a1);
write_dat(0x30+a2);
write_dat('V');
write_com(0x80+0x40+11);
write_dat(0x30+b0);
write_dat('.');
write_dat(0x30+b1);
write_dat(0x30+b2);
write_dat('V');
}
void main()
{
init_1602();
init();
while(1)
{
Ch0value=read_adc(0);
delayms(50);
Ch1value=read_adc(1);
delayms(50);
display();
}
}