#include <reg52.h>
#include <intrins.h>
sbit SCL=P1^0; //SCL
sbit SDA=P1^1; //SDA
sbit led0 = P1^2;
sbit led1 = P1^3;
unsigned char Initdata[4]={0};
code unsigned char seg7code[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff}; //不带小数点的共阳数码管段码
code unsigned char seg7codeB[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0xff}; //带小数点的共阳数码管段码
unsigned int date;
unsigned char cnt;
//******************延时子程序 *******************************
void delay(unsigned char i)
{
for(i;i>0;i--);
}
void delay1ms(unsigned char t)
{
unsigned char i;
unsigned char j;
for(i=124;i>0;i--);
for(j=0;j<t;j++);
}
/****************************开始ADC通信*************************/
void StartADcom()
{
SDA =0;
SCL=1;
delay(100);
SDA =1;
delay(20);
SDA =0;
SCL=0;
delay(10);
}
/***********************************停止ADC通信**************************************/
void StopADcom()
{
SDA=0;
delay(10);
SCL=1;
delay(20);
SDA=1;
delay(10);
}
/********************************单字节I2C传输**************************************/
void Send_Byte(unsigned char byte)
{
unsigned char i;
for(i=0;i<8;i++)
{
if((byte<<i)&0x80)
SDA=1;
else
SDA=0;
delay(5);
SCL=1;
delay(10);
SCL=0;
delay(10);
}
delay(5);
SDA=1;
delay(5);
SCL=1;
delay(10);
SCL=0;
delay(10);
}
/*************************读取一个字节*****************************/
unsigned char Read_Byte()
{
unsigned char temp=0;
unsigned char i;
for(i=0;i<8;i++)
{
temp=temp<<1; //shift left to receive next bit
SCL=0; //set clock high
delay(10);
SCL=1;
_nop_();
delay(5);
if(SDA==1) //check if Data=high
temp|=0x01; //yes - set bit high
_nop_();
delay(10);
}
SCL=0;
delay(5);
SDA=0;
delay(5);
SCL=1;
delay(20);
SCL=0;
delay(5);
SDA=1;
return temp;
}
/**************************配置ADC转换芯片*************************************/
void Confige1115(unsigned char channel_x)
{
unsigned char i=0;
unsigned char a_channel;
switch(channel_x)
{
case 1:
a_channel=0x42;
break;
case 2:
a_channel=0x52;
break;
case 3:
a_channel=0x62;
break;
case 4:
a_channel=0x72;
break;
default:
break;
}
Initdata[0] =0x90;
Initdata[1] =0x01;
Initdata[2]=a_channel;
Initdata[3] =0x83;
SCL=1;
StartADcom();
for(i=0;i<4;i++)
{
Send_Byte(Initdata[i]);
delay(20);
}
StopADcom();
}
/********指向转换结果寄存器**************************/
void Pointregister(void)
{
unsigned char i=0;
Initdata[0] =0x90;
Initdata[1] =0x00;
SCL=1;
StartADcom();
for(i=0;i<2;i++)
{
Send_Byte(Initdata[i]);
delay(20);
}
StopADcom();
delay(10);
}
/*****************读取ADC转换结果*******************/
unsigned int Read1115(void)
{
unsigned char ResultL,ResultH;
unsigned int Result;
Initdata[0] =0x91;
SCL=1;
StartADcom();
delay(10);
Send_Byte(Initdata[0]);
delay(20);
ResultH=Read_Byte();
delay(10);
ResultL=Read_Byte();
StopADcom();
Result=ResultH*256+ResultL;
return Result;
}
/*****ADC模拟量采集转化为数字量*********/
unsigned int Ad_1115(unsigned char channel_Ad)
{
unsigned int adc_value;
Confige1115(channel_Ad);
delay1ms(1);
Pointregister();
delay(10);
adc_value=Read1115();
return adc_value;
}
//********************显示函数****************
void display()
{
P2=0xfe; //P1.0=0，选通第一位
P0=seg7codeB[date/10000]; //十位数，查表，输出
delay1ms(1);
P0=0xff; //消隐
P2=0xfd; //P1.1=0,选通第二位，个位数
P0=seg7code[date%10000/1000];
delay1ms(1);
P0=0xff; //消隐
P2=0xfb; //P1.3=0,选通第三位，小数点第一位
P0=seg7code[date%1000/100];
delay1ms(1);
P0=0xff; //消隐
P2=0xf7; //P1.3=0,选通第四位，小数点第二位
P0=seg7code[date%100/10];
delay1ms(1);
P0=0xff; //消隐
}
void Timer1Init(void)
{
TMOD &= 0x0F;
TMOD |= 0x10;
TL1 = 0x00;
TH1 = 0xff;
TF1 = 0;
TR1 = 1;
}
//**************************** //主程序
main()
{
Timer1Init();
EA = 1;
ET1 = 1;
while(1)
{
//date=Ad_1115(1) * 1.2;
display();
if(date>40000)
{
led0 = 1;
led1 = 0;
}
else if(date>35000)
{
led0 = 0;
delay(50);
led0 = 1;
led1 = 0;
}
else if(date>15000)
{
led0 = 0;
led1 = 1;
}
else
{
led0 = 0;
delay(1);
led0 = 1;
led1 = 1;
}
}
}
void Timer1_isr(void) interrupt 3
{
ET1 = 0;
TH0=0x00;
TL0=0xff;
cnt = cnt + 1;
if(cnt == 1)
{
cnt = 0;
date=Ad_1115(1) * 1.2;
//display();
}
ET1 = 1;
}
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