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#include <reg52.h>
#include <intrins.h>
bit flag =1; //采樣刷新標(biāo)志位
sbit SCL = P2^1; //I2C時(shí)鐘
sbit SDA = P2^0; //I2C數(shù)據(jù)
sbit du=P2^6; //數(shù)碼管段選
sbit we=P2^7; //數(shù)碼管位選
sbit RST=P2^4; //DS1302時(shí)鐘使能端
sbit in1=P3^4; //鍵盤(pán)行掃描檢測(cè)
sbit in2=P3^5;
sbit in3=P3^6;
sbit in4=P3^7;
sbit bibi=P2^3;
unsigned int code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //數(shù)碼管顯示譯碼
unsigned int buffer[3]={0x00,0x00,0x00}; //電壓顯示緩存
unsigned char Ratebuffer[6]; //采樣周期送串口緩存
unsigned int ConfigBuffer[4]; //采樣周期數(shù)碼管顯示緩存
unsigned char sending; //串口發(fā)送一字節(jié)數(shù)據(jù)發(fā)送完成標(biāo)志位
unsigned int Timerflag=1000; //采樣周期全局變量
unsigned int TimerflagBuffer; //采樣周期緩存，用于判斷采樣周期是否發(fā)生變化，若是則送24C02儲(chǔ)存
unsigned char TimerT0[4]; //存儲(chǔ)按鍵設(shè)置的采樣周期各位數(shù)
unsigned char num1; //將采樣周期分解為兩個(gè)8位數(shù)據(jù)，送24C02存儲(chǔ)
unsigned char num2;
unsigned int te;
unsigned int tr;
unsigned int valu;
void Delay(); //用于I2C總線延遲
void delay1(unsigned char a); //用于數(shù)碼管顯示延遲以及24C02存儲(chǔ)延遲
void Start(); //I2C總線開(kāi)始信號(hào)
void Stop(); //I2C總線結(jié)束信號(hào)
bit Write(unsigned char dat); //向I2C總線寫(xiě)一字節(jié)數(shù)據(jù)，并返回應(yīng)答信號(hào)
unsigned char ReadNAK(); //從I2C總線讀一字節(jié)數(shù)據(jù)
unsigned char ReadACK(); //從I2C總線讀多字節(jié)數(shù)據(jù)
void Timer(); //1ms定時(shí)，用于采樣周期
unsigned char ADC(unsigned char ch); //從ADC讀一字節(jié)數(shù)據(jù)
void display(unsigned int t0,unsigned int t1,unsigned int t2); //數(shù)碼管顯示電壓值
void display2(unsigned int t0,unsigned int t1,unsigned int t2,unsigned int t3); //數(shù)碼管顯示采樣周期
void transfer(unsigned char *str,unsigned int val); //將電壓值轉(zhuǎn)換為ASCII碼，用于串口發(fā)送
void UART(); //設(shè)置串行通信
void Config(); //設(shè)置外部中斷1
unsigned char E2Read(unsigned char addr); //從24C02讀取最后一次設(shè)置的采樣周期，用于程序初始化
void E2Write(unsigned char addr,unsigned char dat); //向24C02寫(xiě)入變化后的采樣周期
void main()
{
unsigned int val;
unsigned char str[10];
unsigned char i;
RST=0; //DS1302芯片占用I2C總線，應(yīng)先關(guān)閉使能
num1=E2Read(0);
num2=E2Read(1);
Timerflag=num2*256+num1;
TimerflagBuffer=Timerflag;
Config();
Timer();
UART();
while(1)
{
if(in1==0) //若按鍵1按下，則進(jìn)入外部中斷1
P3=0xf7;
if(flag==1)
{
flag=0;
val=ADC(2);
val=196*val/100; //轉(zhuǎn)換ADC讀出的原始數(shù)據(jù)，避免小數(shù)運(yùn)算
valu=val;
buffer[0]=table[val%10];
buffer[1]=table[val/10%10];
buffer[2]=table[val/100%10]+0x80;
Ratebuffer[0]=','; //將采樣周期轉(zhuǎn)ASCII碼，用于串口發(fā)送
Ratebuffer[1]=Timerflag/1000%10+'0';
Ratebuffer[2]=Timerflag/100%10+'0';
Ratebuffer[3]=Timerflag/10%10+'0';
Ratebuffer[4]=Timerflag%10+'0';
Ratebuffer[5]=',';
transfer(str,val);
for(i=0;i<5;i++)
{
SBUF=str[i];
sending=1;
while(sending);
}
for(i=0;i<6;i++)
{
SBUF=Ratebuffer[i];
sending=1;
while(sending);
}
}
display(buffer[0],buffer[1],buffer[2]);
if(valu>400)
{
if(te<200)bibi=0;
else bibi=1;
}
if(valu<150)
{
if(tr<800)bibi=0;
else bibi=1;
}
if(valu>150&&valu<400)
{
te=0;
tr=0;
bibi=1;
}
if(TimerflagBuffer!=Timerflag) //檢測(cè)采樣周期變化，并存儲(chǔ)到掉電不丟失模塊
{
num2=Timerflag/256;
num1=Timerflag%256;
E2Write(0,num1);
E2Write(1,num2);
TimerflagBuffer=Timerflag;
}
}
}
void Delay()
{
_nop_();_nop_();_nop_();_nop_();
}
void delay1(unsigned char a)
{
unsigned char j,k;
for(j=a;j>0;j--)
for(k=125;k>0;k--);
}
void Start()
{
SDA=1;
SCL=1;
Delay();
SDA=0;
Delay();
SCL=0;
}
void Stop()
{
SCL=0;
SDA=0;
Delay();
SCL=1;
Delay();
SDA=1;
Delay();
}
bit Write(unsigned char dat)
{
bit ack;
unsigned char mask;
for(mask=0x80;mask!=0;mask>>=1)
{
if((mask&dat)==0)
{
SDA=0;
}
else
{
SDA=1;
}
Delay();
SCL=1;
Delay();
SCL=0;
}
SDA=1;
Delay();
SCL=1;
ack=SDA;
Delay();
SCL=0;
return(ack);
}
unsigned char ReadNAK()
{
unsigned char mask;
unsigned char dat;
SDA=1;
for(mask=0x80;mask!=0;mask>>=1)
{
Delay();
SCL=1;
if(SDA==0)
{
dat&= ~mask;
}
else
{
dat|=mask;
}
Delay();
SCL=0;
}
SDA=1;
Delay();
SCL=1;
Delay();
SCL=0;
return dat;
}
unsigned char ReadACK()
{
unsigned char mask;
unsigned char dat;
SDA=1;
for(mask=0x80;mask!=0;mask>>=1)
{
Delay();
SCL=1;
if(SDA==0)
{
dat&=~mask;
}
else
{
dat|=mask;
}
Delay();
SCL=0;
}
SDA=0;
Delay();
SCL=1;
Delay();
SCL=0;
return(dat);
}
void Timer()
{
TMOD=0x01;
TH0=0xfc;
TL0=0x66;
ET0=1;
EA=1;
TR0=1;
}
unsigned char ADC(unsigned char ch)
{
unsigned char val;
EA=0;
Start();
if(Write(0x48<<1))
{
Stop();
return 0;
}
Write(0x40|ch);
Start();
Write((0x48<<1)|0x01);
val=ReadACK();
val=ReadNAK();
Stop();
EA=1;
return val;
}
void display(unsigned int t0,unsigned int t1,unsigned int t2)
{
P0=t0;du=1;du=0;P0=0xdf;we=1;we=0;delay1(5);
P0=t1;du=1;du=0;P0=0xef;we=1;we=0;delay1(5);
P0=t2;du=1;du=0;P0=0xf7;we=1;we=0;delay1(5);
}
void display2(unsigned int t0,unsigned int t1,unsigned int t2,unsigned int t3)
{
P0=t0;du=1;du=0;P0=0xdf;we=1;we=0;delay1(5);
P0=t1;du=1;du=0;P0=0xef;we=1;we=0;delay1(5);
P0=t2;du=1;du=0;P0=0xf7;we=1;we=0;delay1(5);
P0=t3;du=1;du=0;P0=0xfb;we=1;we=0;delay1(5);
}
void transfer(unsigned char *str,unsigned int val)
{
str[0]=(val/100%10)+'0';
str[1]='.';
str[2]=(val/10%10)+'0';
str[3]=(val%10)+'0';
str[4]='V';
}
void UART()
{
EA=0;
SCON=0x50;
PCON=0x00;
TMOD|=0x20;
TH1=0xfd;
TL1=0xfd;
REN=1;
ES=1;
TR1=1;
EA=1;
}
void Config()
{
EA=0;
TCON|=0x04;
P3=0xff;
EX1=1;
EA=1;
}
unsigned char E2Read(unsigned char addr)
{
unsigned char dat;
Start();
Write(0xa0);
Write(addr);
Start();
Write(0xa1);
dat=ReadNAK();
Stop();
delay1(100);
return dat;
}
void E2Write(unsigned char addr,unsigned char dat)
{
Start();
Write(0xa0);
Write(addr);
Write(dat);
Stop();
delay1(5000);
}
void interruptT0() interrupt 1 //定時(shí)器T0中斷，通過(guò)標(biāo)志位完成設(shè)置的采樣周期計(jì)時(shí)
{
static unsigned long t = 0;
TH0=0xfc;
TL0=0x66;
t++;
if(valu>400)
{
te++;
if(te>400)
te=1;
}
if(valu<400&&valu>150)
{
te=0;tr=0;bibi=1;
}
if(valu<150)
{
tr++;
if(tr>1600)
tr=1;
}
if(t>=Timerflag)
{
t=0;
flag=1;
}
}
void interruptS() interrupt 4
{
unsigned long temp;
static signed char n=3;
static unsigned char t[4]; //串口接收到的采樣周期緩存
if(RI==1)
{
EA=0;
RI=0;
temp=SBUF;
if(n>=0)
{
t[n]=temp-'0'; //將接收到的ASCII碼轉(zhuǎn)換為10進(jìn)制存儲(chǔ)
n--;
}
if(n<0) //接收到四位數(shù)后更新采樣周期
{
n=3;
Timerflag=t[3]*1000+t[2]*100+t[1]*10+t[0];
}
EA=1;
}
else
{
TI=0;
sending=0;
}
}
void interruptEX0() interrupt 2 //外部中斷1，完成按鍵操作，進(jìn)入中斷后立即顯示當(dāng)前的采樣周期
{
signed char i;
bit backup; //按鍵備份，用于去抖
REN=0;
EA=0;
ConfigBuffer[0]=table[Timerflag%10];
ConfigBuffer[1]=table[Timerflag/10%10];
ConfigBuffer[2]=table[Timerflag/100%10];
ConfigBuffer[3]=table[Timerflag/1000%10];
while(1)
{
display2(ConfigBuffer[0],ConfigBuffer[1],ConfigBuffer[2],ConfigBuffer[3]);
if(in2==0) //按鍵2按下則退出中斷服務(wù)程序
{
P3=0xff;
EA=1;
break;
}
if(in3==0) //按鍵3按下則開(kāi)始設(shè)置采樣周期，并在數(shù)碼管顯示
{
while(in3!=1); //檢測(cè)按鍵跳變
ConfigBuffer[0]=0x00;ConfigBuffer[1]=0x00;ConfigBuffer[2]=0x00;ConfigBuffer[3]=0x00;
while(1)
{
for(i=3;i>=0;i--) //鍵盤(pán)矩陣掃描，讀取4位采樣周期
{
while(1)
{
display2(ConfigBuffer[0],ConfigBuffer[1],ConfigBuffer[2],ConfigBuffer[3]);
P3=0xfe;
if(in1==0)
{
backup=in1; //按鍵去抖
delay1(20);
if(backup!=in1)continue;
while(in1!=1); //檢測(cè)跳變?yōu)橐淮斡行О存I
ConfigBuffer[i]=table[0];TimerT0[i]=0;break;
}
if(in2==0)
{
backup=in2;
delay1(20);
if(backup!=in2)continue;
while(in2!=1);
ConfigBuffer[i]=table[1];TimerT0[i]=1;break;
}
if(in3==0)
{
backup=in3;
delay1(20);
if(backup!=in3)continue;
while(in3!=1);
ConfigBuffer[i]=table[2];TimerT0[i]=2;break;
}
if(in4==0)
{
backup=in4;
delay1(20);
if(backup!=in4)continue;
while(in4!=1);
ConfigBuffer[i]=table[3];TimerT0[i]=3;break;
}
P3=0xfd;
if(in1==0)
{
backup=in1;
delay1(20);
if(backup!=in1)continue;
while(in1!=1);
ConfigBuffer[i]=table[4];TimerT0[i]=4;break;
}
if(in2==0)
{
backup=in2;
delay1(20);
if(backup!=in2)continue;
while(in2!=1);
ConfigBuffer[i]=table[5];TimerT0[i]=5;break;
}
if(in3==0)
{
backup=in3;
delay1(20);
if(backup!=in3)continue;
while(in3!=1);
ConfigBuffer[i]=table[6];TimerT0[i]=6;break;
}
if(in4==0)
{
backup=in4;
delay1(20);
if(backup!=in4)continue;
while(in4!=1);
ConfigBuffer[i]=table[7];TimerT0[i]=7;break;
}
P3=0xfb;
if(in1==0)
{
backup=in1;
delay1(20);
if(backup!=in1)continue;
while(in1!=1);
ConfigBuffer[i]=table[8];TimerT0[i]=8;break;
}
if(in2==0)
{
backup=in2;
delay1(20);
if(backup!=in2)continue;
while(in2!=1);
ConfigBuffer[i]=table[9];TimerT0[i]=9;break;
}
}
}
Timerflag=TimerT0[3]*1000+TimerT0[2]*100+TimerT0[1]*10+TimerT0[0];
P3=0xff;
EA=1;
break;
}
}
}
REN=1;
}

復(fù)制代碼

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