commonmain.c

本程序是基于c8051f系列的can总线到485总线的转换程序

#include "c8051f040.h"
#include"canreg.h"
sbit P1_0 = P1^0;                
sbit P1_1 = P1^1;                  
sbit P1_2 = P1^2;                   
sbit P1_3 = P1^3;  
#define LEN 8
#define addr 10
#define  uint   unsigned int  
#define uchar  unsigned char 
 xdata uchar recetimeout=0;
 xdata uchar checkerror=0;
 xdata uchar rr[16],sr[16],t[16],r[16];
 xdata uchar count=0;
 xdata uchar rececount=0;
 bit receive_flag=0;
 bit receive_ok=0;
 bit CMDflag=0;
 bit CMD0flag=0;

 //字地址 0 - 255 (只取低8位)
//位地址 0 - 255 (只取低8位)

/* CRC 高位字节值表 */ 
const uint 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 
} ; 
/* CRC低位字节值表*/ 
const uint 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 
} ;


uint CRC(uchar *p, uchar L) 
{   
	uchar uchCRCHi = 0xFF ; /* 高CRC字节初始化 */ 
	uchar uchCRCLo = 0xFF ; /* 低CRC 字节初始化 */ 
	uchar uIndex ; /* CRC循环中的索引 */ 
	while (L>=0) /* 传输消息缓冲区 */ 
	{ 
		uIndex = uchCRCHi ^ *p++ ; /* 计算CRC */ 
		uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex] ; 
		uchCRCLo = auchCRCLo[uIndex] ; 
		L--;
	} 
	return (uchCRCHi << 8 | uchCRCLo) ; 
}


void beginsend(uchar r[])
{uchar i=0;
 for(i=0;i<count;i++)
   {ACC=r[i];
    TB80=P;
    SBUF0=r[i];
   }
}

void start485send(uchar* p)
{
 uint modbus16;
 P1_1=1;
 modbus16=CRC(p,count);
 sr[count++]=modbus16>>8;
 sr[count++]=modbus16&0xff;
 beginsend(p);
 CMDflag=0;
 CMD0flag=0;
  P1_1=0;
}
 
void Timer0() interrupt 1
{TL0=0X01;
 TH0=0X01;
 if(recetimeout>0)
  {recetimeout--;
   if(recetimeout==0&&rececount>0)
    {rececount=0;
     checkerror=0;
    }
  }
}
 
void ASK_repeat(uchar *p)
{uchar i=2;
 uint crc_temp16;
 sr[1]=0x80|sr[1];
 crc_temp16=CRC(&sr,1);
 sr[2]=crc_temp16>>8;
 sr[3]=crc_temp16&0xff;
  count=4;
  beginsend(p);
}


void init_Msgobjeck_rx(uchar Msgnum,uchar Id)
{uint temp;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF2CMDMSK;
 CAN0DAT=0X00bb;
 /*   IF2 Command Mask Registers  =0x00bb 
	WR/RD=1,Mask=0,Arb=1,Control=1,ClrIntPnd=1,TxRqst=0,DataA=1,DataB=1,一次发送8字节数据*/
 CAN0ADR=IF2ARB1;
 CAN0DAT=0X0000;
 temp=Id<<2;
 temp&=0x1fff;
 temp|=0x8000;
 CAN0DAT=temp;
 /*MsgVal=1,Xtd=0,为标准模式，扩展ID无效，Dir=0，为接收*/
 CAN0DAT=0X0488;
 /*IF2 Message Control Registers=0x0488
	NewDat=0,MsgLst=0,IntPnd=0,UMask=0,TxIE=0,RxIE=1,接收中断使能;RmtEn=0,TxRqst=0
	EoB=1,DLC3-0=1000,即数据长度为8*/
 CAN0ADR=IF2CMDRQST;
 CAN0DATL=Msgnum;
}

void init_Msgobject_tx(uchar Msgnum,uchar Id)
{uint temp;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF1CMDMSK;
 CAN0DAT=0X00b3;
 /*   IF1 Command Mask Registers  =0x00b3 
	WR/RD=1,Mask=0,Arb=1,Control=1,ClrIntPnd=0,TxRqst=0,DataA=1,DataB=1,一次发送8字节数据*/
 CAN0ADR=IF1ARB1;
 CAN0DAT=0X0000;
 temp=Id<<2;
 temp&=0x1fff;
 temp|=0xa000;
 CAN0DAT=temp;
 /*MsgVal=1,Xtd=0,为标准模式，扩展ID无效，Dir=1，为发送*/
 CAN0DAT=0X0088;
 /*IF1 Message Control Registers=0x0088
	NewDat=0,MsgLst=0,IntPnd=0,UMask=0,TxIE=0,RxIE=0,RmtEn=0,TxRqst=0
	EoB=1,DLC3-0=1000,即数据长度为8*/
 CAN0ADR=IF2CMDRQST;
 CAN0DAT=Msgnum;
}
  
void clear_Msgobjects()
{uchar i;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF1CMDMSK;
 CAN0DAT=0X00FF;
 for(i=1;i<33;i++)
   {CAN0ADR=IF1CMDRQST;
    CAN0DATL=i;
   }
}

void command_receive(uchar Msgnum)
{uchar i;
 P1_0=1;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF2CMDMSK;
 CAN0DAT=0X000E;
 CAN0ADR=IF2CMDRQST;
 CAN0DAT=Msgnum;
 CAN0ADR=IF2DATA1;
 for(i=0;i<4;i+=2)
  {sr[count++]=CAN0DATH;
   sr[count++]=CAN0DATL;
   if(count==2) count++;
  }
 P1_0=0;
}  
void CMDinit_Msgobject_rx(uchar Msgnum,uchar Id)
{uint temp;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF2CMDMSK;
 CAN0DAT=0X00ba;
/*   IF2 Command Mask Registers  =0x00bb 
WR/RD=1,Mask=0,Arb=1,Control=1,ClrIntPnd=1,TxRqst=0,DataA=1,DataB=0,一次发送8字节数据*/
 CAN0ADR=IF2ARB1;
 CAN0DAT=0X0000;
 temp=Id<<2;
 temp&=0x1fff;
 temp|=0x8000;
 CAN0DAT=temp;
 /*MsgVal=1,Xtd=0,为标准模式，扩展ID无效，Dir=0，为接收*/
 CAN0DAT=0X0484;
 /*IF2 Message Control Registers=0x0484
	NewDat=0,MsgLst=0,IntPnd=0,UMask=0,TxIE=0,RxIE=1,接收中断使能;RmtEn=0,TxRqst=0
	EoB=1,DLC3-0=0100,即数据长度为8*/
 CAN0ADR=IF2CMDRQST;
 CAN0DAT=Msgnum;
}	

void data_receive(uchar Msgnum)
{uchar i;
 P1_0=1;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF2CMDMSK;
 CAN0DAT=0X000F;
 CAN0ADR=IF2CMDRQST;
 CAN0DATL=Msgnum;
 CAN0ADR=IF2DATA1;
 for(i=0;i<LEN;i+=2)
  {sr[count++]=CAN0DATH;
   sr[count++]=CAN0DATL;
   if(count==2) count++;
  }
 sr[2]=count+2;
 P1_0=0;
}	 

void CANO_transist(uchar Msgnum)
{uchar i=0;
 P1_3=1;
 SFRPAGE=CAN0_PAGE;
 CAN0ADR=IF1CMDMSK;
 CAN0DAT=0X0087;
 CAN0ADR=IF1DATA1;
 for(i=3;i<rececount-2;i+=2)
   {CAN0DATH=t[i++];
    CAN0DATL=t[i++];
   }
 CAN0ADR=IF1CMDRQST;
 CAN0DATL=Msgnum;
 P1_3=0; 
}	

void ISR_UART0() interrupt 4
{
 if (RI0)
  {P1_2=1;
   RI0=0;
   recetimeout=3;
   t[rececount]=SBUF0;
   ACC=t[rececount];
   if(P!=RB80)
     checkerror=1;
   if (rececount==0)
     {if(addr!=t[rececount])
         rececount=0;
      else
         rececount++;   
     }
      
   else
       {rececount++;
        if(t[2]==rececount)
          receive_flag=1;
        else
	      receive_flag=0;
       }
   P1_2=0;  
  }
}

void  ISRname () interrupt 19
{ uint xdata  can0temp16;
  uint xdata  page_save;
  uint xdata  status;
 page_save=SFRPAGE;
 SFRPAGE=CAN0_PAGE;
 status=CAN0STA;
 if((status&0x10)!=0)
    {CAN0STA&=0xef;
     CAN0ADR=INTPEND1;
     can0temp16=CAN0DAT;
     if((can0temp16&0x0001)!=0)
       {count=0;
        command_receive(0x01);
	    if(sr[1]==0x01||sr[1]==0x02||sr[1]==0x03||sr[1]==0x04)
           { sr[2]=count+2;
             CMD0flag=1;
 	        }    
       }
     if((can0temp16&0x0002)!=0)
           {data_receive(0x02);
            CMDflag=1;
	       }
    }
  SFRPAGE=page_save;  
} 

 void SYSCLK_INIT()
{uint i;
 OSCXCN=0X67;
 for(i=0;i<256;i++)
  {while(!(OSCXCN&0X80))
     OSCICN=0X88;
  }
} 

void PORT_INIT()
{SFRPAGE=CONFIG_PAGE;
 XBR0=0X04;
 XBR1=0X00;    
 XBR2=0X40;
 XBR3=0X80;
 P0MDOUT=0X01;
}

 void UART0_INIT()
{SFRPAGE=UART0_PAGE;
 SCON0=0XD0;
 PCON=0X00;
 ES0=1;
 SFRPAGE = TMR2_PAGE;
 TMR2CN = 0x00;    
 TMR2CF = 0x08; 
}

void TIMER_INIT()
{SFRPAGE = TIMER01_PAGE;
 TMOD=0X01;
 TH0=0X01;
 TL0=0X01;
 TR0=1;
 ET0=1;
}  

void INIT_GROUPS()
{
 SYSCLK_INIT();
 PORT_INIT();
 UART0_INIT();
 TIMER_INIT();
 clear_Msgobjects();
 CMDinit_Msgobject_rx(0x01,0x02);
 init_Msgobjeck_rx(0x02,0x02);
 init_Msgobject_tx(0x10,0x01);
 EIE1=0X20;
 SFRPAGE=CAN0_PAGE;
 CAN0CN=0X41;
 CAN0ADR=BITREG;
 CAN0DAT=0X01;
 CAN0CN=0X02;
}  

void main()
{xdata uint temp16;
 EA=0;
 INIT_GROUPS();
 EA=1;
 while(1)
 {if(CMDflag||CMD0flag)
    { start485send(&sr);}
  if(receive_flag)
    {  temp16=CRC(&t,rececount);
       if(temp16==0)
           receive_ok=1;
       else 
           receive_ok=0;
       if(receive_ok)
         { if(t[1]==(0x80|sr[1]))
             ASK_repeat(&sr);
          if(t[1]==sr[1])
             CANO_transist(10);
          else
             checkerror=1;
         }
    }        
 }
}