CANbus

[zx81sp]

Your program looks OK at first glance altough I didn't verify the BRG values.

I've got the BRG values using Microchip Can Bit Timing Calculator (from www.intrepidcs.com), it claims to be compatible with MCP2510, I think that the values are same for my MCP2551, also tried with the default values that the calculator shows (03/BF/07) but anyway nothing changes.

What puzzles me is: do you really use an PIC18F258 in combination with an MCP2510?
Or do you use the PIC18F258 with the MCP2551 CAN transceiver as mentioned earlier?

Sorry, the right combo is 18F258+MCP2551.

The MCP2551 has a standby pin - how is it controlled?
It must be tied low for operation!

RS Pin is connected to GND

Check this and we can do further examination on the code.
Are you sure you have set up and connected your CAN-USB adaptor correctly?

When I connect the CANUSB to the CAN network I can see the traffic, so I think that the problem it's not there. When I connect the adapter directly to the board I can't see activity, if the PBP code is right I must receive a command every second.

Thanks for your help!