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Problem to transmit and receive message via CAN

 
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sadism04



Joined: 08 Apr 2010
Posts: 4

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Problem to transmit and receive message via CAN
PostPosted: Thu Apr 08, 2010 11:39 pm     Reply with quote
I have 2 PIC18f458 and want one is transmitter and another is receiver.

Transmitter
Code:

void main(void)
{
   out_data[0] = 0x11 ;
   out_data[1] = 0xCC ;
   out_data[2] = 0x33 ;
   out_data[3] = 0xEE ;
   out_data[4] = 0x55 ;
   out_data[5] = 0xAA ;
   out_data[6] = 0x77 ;
   out_data[7] = 0xFF ;
   can_init() ;

   printf("\n\n\r *** CAN Master *** ") ;

   while(1)
   {
      printf("\n\n\rPress Enter to Sent Message") ;
      c = getch() ;

      if(can_putd(tx_id ,out_data ,tx_len ,tx_pri ,tx_ext ,tx_rtr))
      {
         printf("\n\rMessage is Transmitting\n") ;
         for(i=0;i<8;i++)
            printf("%x ",out_data[i] ) ;
         printf("\n\r") ;
      }
      else
         printf("\n\rSent Message Error") ;

   }
}


Receiver
Code:

void main(void)
{
   struct rx_stat rxstat ;
   int32 rx_id ;
   int rx_len ;
   int in_data[8] ;
   int i ;

   can_init() ;
   enable_interrupts(GLOBAL) ;

   for(i=0;i<8;i++)
      in_data[i] = 0 ;

   printf("\n\n\r *** CAN Slave *** " ) ;

   while(1)
   {
     if(can_kbhit() )
     {
      printf("\n\rGet Message in Buffer") ;

      if(can_getd(rx_id ,in_data ,rx_len ,rxstat ))
      {
         printf("\n\rShow ID : %LU",rx_id ) ;
         for(i=0;i<8;i++)
            printf("%x ",in_data[i] ) ;
         printf("\n\r") ;
      }
     
     }

   }
}

When I test them, transmitter send message. It shows "Message is Transmitting" but receiver haven't respond.
Can anyone solve my problem?

I'm a newbie and not good in english.

Thank for all reply.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 09, 2010 12:54 am     Reply with quote
Use the code in this post. It shows how to test the CAN bus connection
between two 18F458 boards:
http://www.ccsinfo.com/forum/viewtopic.php?t=29627&start=7

Use this schematic:
http://www.microchip.com/forums/upfiles.aspx/52252/1E05A177D4B746B0B4C23DB18CC4F360.JPG
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