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Question about RS485 driver file

 
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stoyanoff



Joined: 20 Jul 2011
Posts: 375

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Question about RS485 driver file
PostPosted: Mon May 18, 2015 12:40 pm     Reply with quote
Greetings! I'm looking at RS485.c driver file. This is part of the send message procedure:
Code:

 for(try=0; try<5; ++try) {
      rs485_collision = 0;
      fputc((int16)0x100|rs485_id, RS485_CD);
      fputc((int16)0x100|to, RS485_CD);
      fputc(len, RS485_CD);

      for(i=0, cs=rs485_id^to^len; i<len; ++i) {
         cs ^= *data;
         fputc(*data, RS485_CD);
         ++data;
      }

      fputc(cs, RS485_CD);
      if(!rs485_collision) {
         ret = TRUE;
         break;
      }
      delay_ms(RS485_ID);
   }

Can anyone explain to me how it finds if there is a collision?
Thanks!
Ttelmah



Joined: 11 Mar 2010
Posts: 19548

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PostPosted: Mon May 18, 2015 1:07 pm     Reply with quote
rs485_collision, is defined at the start of the file as bit 6 of the RS235_ERRORS byte. This byte is automatically updated by the CCS RS232 driver when a putc is performed.
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