rtu02.c

本程序为51单片机上的Mobus协议的传输程序,用于数据的传输.

/*RTU
   测试参数：0100000001D8*/
#include "aduc812.h"
#define COUNT 6
unsigned char Sbuffer[COUNT]={0x01,0x00,0x00,0x00,0x00,0x00};
unsigned char Rbuffer[COUNT];
unsigned char T0date[2]={0xf8,0x00};
unsigned char uchS[2];
int Spointer,Rpointer;
sbit Flag_cs=0xff;
sbit Flag_adc=0xfe;

/* 查表法得CRC校验值*/ 
extern const char code auchCRCHi[];
extern const char code auchCRCLo[];
void crc16(unsigned char *puchMsg,unsigned int crc_count)
{   
	unsigned char uindex;
	uchS[0]=0xff;
	uchS[1]=0xff;
	if(crc_count>0&&crc_count<50)
	while(crc_count)
	{
		uindex=uchS[0] ^ *puchMsg;
		puchMsg++;
		uchS[0]=uchS[1] ^ auchCRCHi[uindex];
		uchS[1]=auchCRCLo[uindex];
		crc_count--;
	}
}
/*A/D转换中断服务程序*/
//用于保存A/D转换结果
void  int_adc(void) interrupt 6 using 2
{
  Sbuffer[2]=ADCDATAH;Sbuffer[3]=ADCDATAL;
  Flag_adc=1;
}
/*定时器T0中断服务程序*/
//用于接收结束处理
void  int_T0(void) interrupt 1 using 1
{
   TR0=0;Rpointer=0;Rbuffer[0]=0x00;
 }
/*串行中断服务程序*/
void send_receive(void) interrupt 4 using 3
{  
  if(RI&&Flag_cs==0)//接收数据处理
   {
      RI=0;
      Rbuffer[Rpointer]=SBUF;Rpointer++;
      if(Rpointer>=6)
        { if(Rbuffer[0]==Sbuffer[0]&&Rpointer>2)
            {ADCCON2=0x00;SCONV=1;REN=0;}
		  else
            {Rpointer=0;}}
      else
	  {TH0=T0date[0];TL0=T0date[1];TR0=1;}
	}
   else     //发送数据处理
	{
	  TI=0;
	  if(Spointer<COUNT)  //发送结束判断
	  {
		SBUF=Sbuffer[Spointer];Spointer++;
	  }
	  else
	   {Spointer=0;Flag_cs=0;REN=1;}
	 }
}
void main()
{
  /*初始化*/
  SCON=0x50;
  PCON=0x00;
  TMOD=0x21;
  TH1=0xfd;
  TL1=0xfd;
  Spointer=0;
  Rpointer=0;
  TR1=1;
  ET1=0;
  ET0=1;
  PT0=1;
  ES=1;
  EA=1;
  Flag_cs=0;
  Flag_adc=0;
  ADCCON1=0x7c;
  EADC=1;
  while(1)
  {
   if(Flag_adc==1)
    { 
	  EA=0;
	  Flag_adc=0;
	  Sbuffer[1]=Rbuffer[1];
	  crc16(Rbuffer,Rpointer-2);
	  if(uchS[0]!=Rbuffer[Rpointer-2]||uchS[1]!=Rbuffer[Rpointer-1])
      Sbuffer[1]=Sbuffer[1]|0x80;
	  Rpointer=0;
      crc16(Sbuffer,4);
	  Sbuffer[4]=uchS[0];
	  Sbuffer[5]=uchS[1];
	  EA=1;Flag_cs=1;
      SBUF=Sbuffer[Spointer];Spointer++;
	}
  }
}

/* Table of CRC values for high-order byte */

const char code auchCRCHi[] = {
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 
0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
} ; 

/* Table of CRC values for low-order byte */

const char code auchCRCLo[] = {
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 
0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 
0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 
0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 
0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 
0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 
0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 
0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 
0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 
0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 
0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 
0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 
0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 
0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 
0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 
0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 
0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 
0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 
0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 
0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 
0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 
0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 
0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 
0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C, 
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 
0x43, 0x83, 0x41, 0x81, 0x80, 0x40
} ;