基于RS-485的多機通信

ID:117656 · 發(fā)表于 2016-4-30 13:37

//-----------------------oˉêyéùÃ÷￡¬±äá¿¶¨òå--------------------------------------------------------
#include <reg51.h>
sbit RE_DE=P1^0;

#define COUNT 10             // ¶¨òå½óêÕ»o3åÇø′óD¡
#define ADD 5 //¶¨òåéè±¸μØÖ·
unsigned char buffer[COUNT]; //¶¨òå½óêÕ»o3åÇø
unsigned char point;          //¶¨òå½óêÕêy¾Y¸öêyÖ¸ê¾±äá¿

void UART_init();             //′®¿ú3õê¼»ˉoˉêy
void COM_send(void);          //′®¿ú½óêÕoˉêy
unsigned char CLU_checkdata(void);//¼ÆËãD￡ÑéÎ»oˉêy
//--------------------------------------------------------------------------------------------------
// oˉêyÃû3Æ￡o UART_init()′®¿ú3õê¼»ˉoˉêy
// oˉêy1|Äü￡o ÔúÏμí3ê±ÖóÎa11.059MHZê±￡¬éè¶¨′®¿ú2¨ìØÂêÎa9600bit/s
//          ′®¿ú½óêÕÖD¶ÏÔêDí￡¬·￠ËíÖD¶Ï½ûÖ1
//--------------------------------------------------------------------------------------------------
void UART_init()
{
                  //3õê¼»ˉ′®DD¿úoí2¨ìØÂê·￠éúÆ÷
SCON =0x0F0;       //Ñ¡Ôñ′®¿ú1¤×÷·½ê½Îa3￡¬′ò¿a½óêÕÔêDí
TMOD =0x21;       //¶¨ê±Æ÷11¤×÷Ôú·½ê½2￡¬¶¨ê±Æ÷01¤×÷Ôú·½ê½1
TH1 =0xfd;          //êμÏÖ2¨ìØÂê9600￡¨Ïμí3ê±Öó11.0592MHZ￡©
TL1 =0xfd;          //êμÏÖ2¨ìØÂê9600￡¨Ïμí3ê±Öó11.0592MHZ￡©
TR1 =1;             //Æô¶ˉ¶¨ê±Æ÷T1
ET1 =0;
ES=1;             //ÔêDí′®DD¿úÖD¶Ï
PS=1;             //éè¼Æ′®DD¿úÖD¶ÏóÅÏè¼¶
EA =1;             //μ￥Æ¬»úÖD¶ÏÔêDí
SM2=1;             //éè±¸′|óúμØÖ·¼àìy×′ì¬
}
//--------------------------------------------------------------------------------------------------
// oˉêyÃû3Æ￡o com_interrup()′®¿ú½óêÕÖD¶Ï′|àíoˉêy
// oˉêy1|Äü￡o ½óêÕ°üà¨Æeê¼Î»0xFE￡¬μØÖ·Î»oíÖÕÖ1Î»0xEFÔúÄúμÄê®Î»êy¾Yμ½êy¾Y»o3åÇø￡¬
//          μØÖ·2»Æ￥Åä￡¬Ôò½óêÕμ½μÄêÇÎTD§êy×Ö￡¬2»D′μ½½óêÕ»o3åÇø
//--------------------------------------------------------------------------------------------------
com_interrupt(void) interrupt 4 using 3
{
  unsigned char RECEIVR_buffer;
  if(RI)
  {                            //′|àí½óêÕÖD¶Ï
RI=0;                               //Çå3yÖD¶Ï±êÖ¾Î»
RECEIVR_buffer=SBUF;             //½óêÕ′®¿úêy¾Y
if(point==0)       //èç1û»1Ã»óD½óêÕμ½Æeê¼Î»
      {
      if(RECEIVR_buffer==0xFE)       //ÅD¶ÏêÇ·ñÆeê¼±êÖ¾Î»
         buffer[point++]=RECEIVR_buffer;//Æeê¼Õyè·￡¬½óêÕÆeê¼Î»
else
      point=0;       //2»êÇ￡¬¼ìDøμè′yÆeê¼Î»
}
   else if(point==1) //êÇ·ñμØÖ·Î»
      {
      if(RECEIVR_buffer==ADD)       //ÅD¶ÏμØÖ·êÇ·ñÆ￥Åä
      buffer[point++]=RECEIVR_buffer;//μØÖ·Æ￥Åä￡¬½óêÕ¿aê¼½óêÕ
else
      point=0;       //2»Æ￥Åä￡¬¼ìDøÏÂò»¸öÆeê¼Î»
}
else if(point>0&&point<10)    //ÅD¶ÏêÇ·ñ½óêÕ1»ê®Î»êy¾Y
   buffer[point++]=RECEIVR_buffer;    //2»1»￡¬°Ñ½óêÕμ½μÄêy¾Y·Åèë½óêÕ»o′æÇø
else point=0;                   //»o3åÇøòÑÂú￡¬Çå3y»o′æÇøÄúêy¾YÖØDÂ½óêÕ
}
if(TI)                                  //′®¿ú·￠ËíÖD¶Ï
{
TI=0;                                  //Çå3y·￠ËíÖD¶Ï
}
}
//--------------------------------------------------------------------------------------------------
// oˉêyÃû3Æ￡o COM_send()′®¿ú·￠Ëíoˉêy
// oˉêy1|Äü￡o °Ñêy¾Y»o3åÇøμÄê®Î»êy¾Y·￠Ëí3öè￥
//--------------------------------------------------------------------------------------------------
void COM_send(void)
{
RE_DE=1;                               //éèÖÃMAX483½øèë·￠Ëí×′ì¬
for(point=0;point<=10,TI=1;point++)    //á¬Dø·￠Ëíê®Î»êy¾Y
                                       //°Ñ»o′æÇøμÄêy¾Y¶¼·￠Ëíμ½′®¿ú
  {
SBUF=buffer[point];
TI=0;
}
RE_DE=0;                               //éèÖÃMAX483½øèë½óêÕ×′ì¬
}

//--------------------------------------------------------------------------------------------------
// oˉêyÃû3Æ￡o Ö÷oˉêy
// oˉêy1|Äü￡o μ÷¶è¸ö×óoˉêy￡¬íê3éí¨DÅ1y3ì
//--------------------------------------------------------------------------------------------------
void main(void)
{
UART_init();    //3õê¼»ˉ′®¿ú

  do
  {
}
while(point!=10); //ÅD¶Ïêy¾YêÇ·ñ½óêÕíê3é
COM_send(); //μØÖ·Æ￥Åä￡¬êy¾YíêÕû½óêÕ￡¬μ÷óÃ·￠Ëí3ìDòí¨ÖaÖ÷»ú
  SM2=0;                //éèÖÃÎaμã¶Ôμãí¨DÅ×′ì¬
}

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基于RS-485的多機通信

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