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Can_init() with the MCP2515 of the CAN Development Kit

 
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Nilgiro
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Can_init() with the MCP2515 of the CAN Development Kit
PostPosted: Tue May 30, 2006 9:45 am     Reply with quote
Hi everybody,

I'm working with the CAN Development Kit and when I enter in the can_init() function, the PIC 16F877 can't go out of this function. In fact, it can't change from normal mode to config mode...so it blocks when entering in CAN_set_baud() !
This is disturbing Smile

I need some help because I can't work...Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue May 30, 2006 11:57 am     Reply with quote
What driver files are you using ? I have vs. 3.249 of the compiler,
and it doesn't have files specifically for the MCP2515. It has
"can-mcp2510.c" and "can-mcp2510.h" files. These should be
compatible with the MCP2515. Does your CCS kit come with MCP2515
files ?

My guess is that the driver may not be configured to use the correct
PIC pins for your development board. The can-mcp2510.c has the
following pin definitions at the top of the file.
Code:

//IO pins connected to MCP2510
#ifndef EXT_CAN_CS
   #define EXT_CAN_CS   PIN_B1
   #define EXT_CAN_SI   PIN_C1
   #define EXT_CAN_SO   PIN_C0
   #define EXT_CAN_SCK  PIN_C3
//   #define EXT_CAN_RESET   PIN_B5
//   #define EXT_CAN_TX0RTS  PIN_C4
//   #define EXT_CAN_TX1RTS  PIN_B4
//   #define EXT_CAN_TX2RTS  PIN_C2
#endif

So if program which #includes the can-mcp2510.c file doesn't have
the EXT_CAN_CS defined, the driver will use the default pins as
shown above. These are pin B1 for CS, pin C1 for SI, etc.

Do these pins match your board ? Look in the documentation, at the
schematic. See what PIC pins are used for these four signals, which
are used to talk to the MCP2515 chip.
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