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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 53 | johboh | 1 | /********************************************************************* |
| 2 | * |
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| 3 | * CAN specification |
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| 4 | * |
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| 5 | ********************************************************************* |
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| 6 | * FileName: CANdefs.h |
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| 7 | * |
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| 8 | * Author Date Comment |
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| 9 | *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 10 | * Johan Böhlin 21-10-06 Original (Rev 1.0) |
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| 11 | ********************************************************************/ |
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| 80 | johboh | 12 | // $Id: CANdefs.h 80 2006-11-11 20:22:39Z johboh $ |
| 53 | johboh | 13 | |
| 14 | #ifndef CANDEFS_H |
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| 15 | #define CANDEFS_H |
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| 16 | |||
| 17 | #include <compiler.h> |
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| 18 | |||
| 64 | johboh | 19 | #define CAN_BAUD 0.500000 //in Mbits/s |
| 53 | johboh | 20 | //#define CAN_LOOPBACK_MODE |
| 21 | |||
| 22 | |||
| 23 | // TQ(us) = (2 * (BRP + 1))/FOSC(MHz) |
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| 24 | // Nominal Bit Rate(kbit/s) = 1 / TBIT = 1 / (TQ(us) * 8) |
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| 25 | // Where 8 is nominal bit time. |
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| 26 | // From this, BRP can be calculated. |
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| 27 | // |
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| 28 | // Nominal Bit Rate(kbit/s) = 1 / TBIT = 1 / ((2 * (BRP + 1))/FOSC(MHz) * 8) |
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| 29 | |||
| 30 | #define CAN_BRP (int)(CLOCK_FOSC/(CAN_BAUD * 16) - 1) |
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| 31 | |||
| 32 | |||
| 33 | #endif //CANdefs.h |