#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
unsigned int time=0;
unsigned int timer=0;
unsigned char posit;
unsigned long S;
bit flag =0;
sbit RX=P1^1;
sbit TX=P1^0;
sbit DOUT=P3^7; //输出
sbit CLK =P3^6; //时钟
sbit DIN =P3^4; //输入
sbit CS =P3^5; //片选
sbit led=P2^6;
uint temp;
void delayms(unsigned char ms)
{
unsigned char i;
while(ms--)
{
for(i = 0; i < 120; i++);
}
}
void delay(uint i)
{
while(i--);
}
void Conut()
{
time=TH0*256+TL0;
TH0=0;
TL0=0;
S= (long)(time*0.17); //算出来是CM
}
void zd0() interrupt 1 //T0中断用来计数器溢出,超过测距范围
{
flag=1; //中断溢出标志
}
void zd3() interrupt 3 //T1中断用来扫描数码管和计800MS启动模块
{
TH1=0xf8;
TL1=0x30;
timer++;
if(timer>=100)
{
timer=0;
TX=1;
//800MS 启动一次模块
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
TX=0;
}
}
void SPI_Start(void)
{
CLK = 0;
CS = 1;
DIN = 1;
CLK = 1;
CS = 0;
}
void SPI_Write(uchar dat)
{
uchar i;
CLK = 0;
for(i=0; i<8; i++)
{
DIN = dat >> 7; //放置最高位
dat <<= 1;
CLK = 0; //上升沿放置数据
CLK = 1;
}
}
uint SPI_Read(void)
{
uint i, dat=0;
CLK = 0;
for(i=0; i<12; i++) //接收12位数据
{
dat <<= 1;
CLK = 1;
CLK = 0;
dat |= DOUT;
}
return dat;
}
uint Read_AD_Data(uchar cmd)
{
uchar i;
uint AD_Value;
CLK = 0;
CS = 0;
SPI_Write(cmd);
for(i=6; i>0; i--); //延时等待转换结果
CLK = 1; //发送一个时钟周期，清除BUSY
_nop_();
_nop_();
CLK = 0;
_nop_();
_nop_();
AD_Value=SPI_Read();
CS = 1;
return AD_Value;
}
void datapros()
{
static uchar i;
SPI_Write(2);
Read_AD_Data(1);
if(i==2)
{
i=0;
temp = Read_AD_Data(0xA4);
}
i++;
}
void main()
{
SPI_Start();
TMOD=0x11;
TH0=0;
TL0=0;
TH1=0xf8; //2MS定时
TL1=0x30;
ET0=1; //允许T0中断
ET1=1; //允许T1中断
TR1=1; //开启定时器
EA=1; //开启总中断
while(1)
{
datapros();
if(temp>3600)
{
delayms(10);
while(!RX); //当RX为零时等待
TR0=1; //开启计数
while(RX); //当RX为1计数并等待
TR0=0;
Conut();
if((S>=4000)||flag==1)
{
flag=0;
led=1;
}
else
{
led=0;
delay(60000);
}
}
else
{
led=1;
}
}
}
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