PIC16F877A and PC serial communication C language source program-EEWORLD

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//*******Serial communication program************
//*******Define variables*************
#include
#define unchar unsigned char
#define uint unsigned int
unchar RC_label;//The start bit of the flag is 1 and the end bit is 0
unchar caiji_label;//The acquisition frame format flag is 1 if it is correct and 0 if it is wrong
unchar data RC[100];//Store received data
unchar data TX1[100];//Store own parameters
unchar data TX2[100];//Store error indication ERROR
int RC_buff;//
int i=0,j=0,k=0;//
//*****Variable definition completed************
//*****Subroutine area****************
//*****Serial port initialization program starts**********
void initRS232()
{
//Set TXSTA
CSRC=0;//
TX9=0;//8-bit data transmission
TXEN=1;//transmission enable
SYNC=0;//select asynchronous mode
BRGH=1;//high speed
TRMT=1;//transmission register empty
TX9D=0;//
//Set RCSTA
SPEN=1;//allow serial port to work
RX9=0;//receive 8-bit data
SREN=1;//
CREN=1;//enable continuous reception
ADDEN=0;//
FERR=0;//
OERR=0;//no overspeed error
RX9D=0;//
TRISC=0X80;//set C port
SPBRG=0X19;//set baud rate to 9600
}
//*******initialization 232 completed********
//*******delay subroutine starts********
void delay(int i)
{for(i;--i;) continue;}
//******delay subroutine completed*******
//******interrupt initialization subroutine starts******
void int_interrupt(void)
{
GTE=1;//
PEIE=1;//
RCIE=1;//
}
//*******Interrupt initialization subroutine completed********
//********Interrupt service subroutine started*********
void interrupt receive(void)
{
if(OERR==1)//Judge whether there is an overspeed error
   {
    CREN=0;
    CREN=1;
    }
if(RCIF==1)
   {
    RC_buff=RCREG;
      if(RC_buff==0x2a)//Judge whether it is the start mark*
        {
         RC_label=1;
        }
      if(RC_buff==0x23)//Judge whether it is the end mark＃
        {
         RC_label=0;
        }
    }

if(RC_label==1)
     RC[k++]=RC_buff;//Store the received data in the arrayelse
if(RC_label==0)
        k=0;
if(RC[1]==0XFE&&RC[2]==0XC0&&RC[3]==0X34&&RC[5]==0X12)//Judge whether the data acquisition frame format is correct
     caiji_label=1;
else caiji_label=0;
//********Interrupt service subroutine completed **********
//********Parameter sending subroutine started **********
void TX_serve(void)
{
   TX1[]={0X2A,0XFD,0X26,0X30,0X31,0X32};//Own parameters are stored in TX1
   TX2[]={0X56,0X52,0X52,0X4F,0X52};//Error indication is stored in TX2
   if(caiji_label==1)//If the data acquisition frame format is correct, send its own parameter frame
      {
       for(j=0;j<6;j++)
           {
            TXREG=TX1[j];
             delay(20);
            }
      }
    if(caiji_label==0) //If the data acquisition frame format is wrong, send an error indication
      {
       for(j=0;j<5;j++)
           {
            TXREG=TX2[j];
             delay(20);
            } } }
       // ********Parameter sending subroutine completed********** //********Main program starts************** void main()    {     int_interrupt();     initRS232();     TX_serve();    end }

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