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CAN BUS & PIC18F248

 
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Animok



Joined: 03 May 2018
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CAN BUS & PIC18F248
PostPosted: Thu Nov 08, 2018 1:23 pm     Reply with quote

Hello everyone.

A simple question:

Can I use EX_J1939.c with PIC18F248?

This example refer to PIC18F4580.h why?

Regards
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Fri Nov 09, 2018 1:31 am     Reply with quote

Potentially with a bit of tweaking. Obviously you have to setup the clock and fuses etc., to match.

Key is in the PIC18 can driver (can-18F4580.c), where it carefully says:
Quote:

CAN Library routines for Microchip's PIC18Cxx8 and 18Fxx8 line


The 248, has the 'standard' CAN peripheral, not the ECAN peripheral, but the driver supports a 'legacy' mode to support this.

Problem comes in j1939.c, where there is the section:
Code:

    #else //PIC18
      can_set_mode(CAN_OP_CONFIG);  //put CAN in Config mode
     
      can_set_functional_mode(CAN_FUN_OP_ENHANCED_FIFO);


You'll have to change this to CAN_FUN_OP_LEGACY.
The driver can work with this, since it is used if running with an external chip. So it ought then to run....
Animok



Joined: 03 May 2018
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PostPosted: Fri Nov 09, 2018 3:06 am     Reply with quote

Thanks Ttelmah.

I wil try it.
However, what about PIC18F25K80 ?
It have ECAN, is it better option?

Regards
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Fri Nov 09, 2018 5:00 am     Reply with quote

Yes. With the fuses set right that is directly compatible.
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