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本程序為main.c和串口通信.c組成 密碼字符為THE password Is Corret !(注意空格也算字符)
主機箱向從機發送一個X從機收到X后就一直回應主機X，主機收到從機發送的X后證明從機已準備好接受數據（如果從機向主機發送的不是X則主機一直向從機發送X直到從機收到正確的數據即X），主機向從機發送非X的任意字符叫從機停止發送，主機向從機發送密碼“THE password Is Corret !”從機收到密碼后向主機發送M（一直發）表示密碼正確，如果在傳輸數據的過程中出現干擾導致的密碼輸入錯誤，那么就必須在發送完最后一個字符后從新發送（注意：這里最后一個字符是用來校驗的如果發送錯誤則必須重新發送直到最后一個字符正確后才可以重新發密碼）
/***************main.c******************/
#include<reg51.h>
void Init_Serialport1();
void Uart();
void main()
{
Init_Serialport1();
Uart();
}
/*******************串口通信.c*************************/
#include<reg51.h>
unsigned char Serial_data; //串口數據（Serial_data）用這個來保存。
static unsigned char Into=0;
static bit Password_Num1=0;
void Init_Serialport1() //初始化串口1（Serial port）
{
TMOD=TMOD&0x0F;
TMOD=TMOD|0x20;
TH1=0xFD;
TL1=0xFD;
TR1=1;
SCON=SCON&0x0F;
SCON=0x50;
EA=1;
ES=1;
}
void Uart()
{
Init_Serialport1();
while(1)
{
static bit Password1=0;
static bit Password2=0;
static bit Password3=0;
static bit Password4=0;
static bit Password5=0;
static bit Password6=0;
static bit Password7=0;
static bit Password8=0;
static bit Password9=0;
static bit Password10=0;
static bit Password11=0;
static bit Password12=0;
static bit Password13=0;
static bit Password14=0;
static bit Password15=0;
static bit Password16=0;
static bit Password17=0;
static bit Password18=0;
static bit Password19=0;
static bit Password20=0;
static bit Password21=0;
static bit Password22=0;
static bit Password23=0;
static bit Password24=0;
static bit Password25=0;
static unsigned char Into_Password=0;
while(Into==1)
{
static unsigned char I=0;
ES=0;
SBUF=Serial_data;
while(TI==0);
TI=0;
if(Serial_data=='X')
{
I=1;
}
if(Serial_data!='X'&I==1)
{
Into_Password=1;
Into=0;
}
ES=1;
}
ES=0;
SBUF='9';
while(TI==0);
TI=0;
ES=1;
while(Into_Password==1)
{
static bit Num_Password=1;
static bit o=0;
static bit y=0;
static bit r=0;
static bit c=0;
static bit u=0;
static bit v=0;
static bit l=0;
static bit q=0;
static bit m=0;
static bit h=0;
if(Password_Num1==1)
{
ES=0;
SBUF='0';
while(TI==0);
TI=0;
if(Serial_data=='T')
{Password1=1;}
else if(Serial_data=='H')
{Password2=1;}
else if(Serial_data=='E')
{Password3=1;}
else if(Serial_data==' '&r==0)
{Password4=1;r=1;}
else if(Serial_data=='p')
{Password5=1;}
else if(Serial_data=='a')
{Password6=1;}
else if(Serial_data=='s'&y==0)
{Password7=1;y=1;}
else if(Serial_data=='s'&q==0)
{Password8=1;q=1;}
else if(Serial_data=='w')
{Password9=1;}
else if(Serial_data=='o'&m==0)
{Password10=1;m=1;}
else if(Serial_data=='r'&h==0)
{Password11=1;h=1;}
else if(Serial_data=='d')
{Password12=1;}
else if(Serial_data==' '&c==0)
{Password13=1;c=1;}
else if(Serial_data=='I')
{Password14=1;}
else if(Serial_data=='s'&l==0)
{Password15=1;l=1;}
else if(Serial_data==' '&u==0)
{Password16=1;u=1;}
else if(Serial_data=='C')
{Password17=1;}
else if(Serial_data=='o')
{Password18=1;}
else if(Serial_data=='r'&o==0)
{Password19=1;o=1;}
else if(Serial_data=='r')
{Password20=1;}
else if(Serial_data=='e')
{Password21=1;}
else if(Serial_data=='c')
{Password22=1;}
else if(Serial_data=='t')
{Password23=1;}
else if(Serial_data==' '&v==0)
{Password24=1;v=1;}
else if(Serial_data=='!')
{Password25=1;Num_Password=0;} //&Password16==1&Password17==1&Password18==1&Password19==1&Password20==1&Password21==1&Password22==1&Password23==1&Password24==1&Password25==1
if(Password1==1&Password2==1&Password3==1&Password4==1&Password5==1&Password6==1&Password7==1&Password8==1&Password9==1&Password10==1&Password11==1&Password12==1&Password13==1&Password14==1&Password15==1&Password16==1&Password17==1&Password18==1&Password19==1&Password20==1&Password21==1&Password22==1&Password23==1&Password24==1&Password25==1)
{
Into_Password=2;
Password_Num1=0;
}
if(Num_Password==0)
{
Num_Password=1;
o=0;y=0;r=0;c=0;u=0;v=0;l=0;q=0;m=0;h=0;
Password1=0;Password2=0;Password3=0;Password4=0;Password5=0;Password6=0;Password7=0;Password8=0;Password9=0;Password10=0;Password11=0;Password12=0;Password13=0;Password14=0;Password15=0;Password16=0;Password17=0;Password18=0;Password19=0;Password20=0;Password21=0;Password22=0;Password23=0;Password24=0;Password25=0;}
Password_Num1=0;
ES=1;
}
}
while(Into_Password==2)
{
ES=0;
SBUF='M';
while(TI==0);
TI=0;
ES=1;
}
}
}
void Serial_port1() interrupt 4
{
static bit a1=0;
RI=0;
Serial_data=SBUF;
Password_Num1=1;
if(a1==0)
{
Into=1;
a1=1;
}
}
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