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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 85 | johboh | 1 | /********************************************************************* |
| 2 | * |
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| 86 | johboh | 3 | * CAN definitions like behavior and bus speed |
| 85 | johboh | 4 | * |
| 5 | ********************************************************************* |
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| 86 | johboh | 6 | * FileName: $HeadURL: https://svn.auml.se/svn/HomeAutomation/trunk/EmbeddedSoftware/PIC/canBase/Include/CANdefs.h $ |
| 7 | * Last changed: $LastChangedDate: 2007-01-28 14:58:11 +0100 (Sun, 28 Jan 2007) $ |
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| 8 | * By: $LastChangedBy: johboh $ |
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| 9 | * Revision: $Revision: 260 $ |
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| 85 | johboh | 10 | ********************************************************************/ |
| 11 | |||
| 86 | johboh | 12 | |
| 85 | johboh | 13 | #ifndef CANDEFS_H |
| 14 | #define CANDEFS_H |
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| 15 | |||
| 16 | #include <compiler.h> |
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| 17 | |||
| 260 | johboh | 18 | //#define CAN_BAUD 0.500000 //in Mbits/s |
| 85 | johboh | 19 | //#define CAN_LOOPBACK_MODE |
| 20 | |||
| 21 | |||
| 22 | // TQ(us) = (2 * (BRP + 1))/FOSC(MHz) |
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| 23 | // Nominal Bit Rate(kbit/s) = 1 / TBIT = 1 / (TQ(us) * 8) |
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| 24 | // Where 8 is nominal bit time. |
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| 25 | // From this, BRP can be calculated. |
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| 26 | // |
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| 27 | // Nominal Bit Rate(kbit/s) = 1 / TBIT = 1 / ((2 * (BRP + 1))/FOSC(MHz) * 8) |
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| 28 | |||
| 29 | #define CAN_BRP (int)(CLOCK_FOSC/(CAN_BAUD * 16) - 1) |
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| 30 | |||
| 31 | |||
| 32 | #endif //CANdefs.h |