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  1. /*********************************************************************
  2.  *
  3.  *                  CAN specification
  4.  *
  5.  *********************************************************************
  6.  * FileName:        CANdefs.h
  7.  *
  8.  * Author               Date    Comment
  9.  *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10.  * Johan Böhlin     21-10-06    Original        (Rev 1.0)
  11.  ********************************************************************/
  12. // $IDI$
  13.  
  14. #ifndef CANDEFS_H
  15. #define CANDEFS_H
  16.  
  17. #include <compiler.h>
  18.  
  19. #define CAN_BAUD 0.500000 //in Mbits/s
  20. //#define CAN_LOOPBACK_MODE
  21.  
  22.  
  23. // TQ(us) = (2 * (BRP + 1))/FOSC(MHz)
  24. // Nominal Bit Rate(kbit/s) = 1 / TBIT = 1 / (TQ(us) * 8)
  25. // Where 8 is nominal bit time.
  26. // From this, BRP can be calculated.
  27. //
  28. // Nominal Bit Rate(kbit/s) = 1 / TBIT = 1 / ((2 * (BRP + 1))/FOSC(MHz) * 8)
  29.                    
  30. #define CAN_BRP (int)(CLOCK_FOSC/(CAN_BAUD * 16) - 1)
  31.  
  32.  
  33. #endif //CANdefs.h
  34.