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Enabling DCAN0 (Disabling I2C2)

robert1

I'm trying to get DCAN0 to work on the Beaglebone Black (the element14 industrial version). Not surprisingly configure-pin doesn't work out of the box since I2C2 is used for Capes.

 

root@beaglebone:~# config-pin p9.19 can Pin is not modifyable: P9_19 i2c2_scl

 

I've no use for the capes (only our custom board). Web searches indicate that it should be possible to disable i2c2 and allow DCAN0 to be enabled. I've not figure out what needs to be done though.

 

On board version:

root@beaglebone:~# uname -a

Linux beaglebone 4.1.15-ti-rt-r43 #1 SMP PREEMPT RT Thu Jan 21 20:13:58 UTC 2016 armv7l GNU/Linux

 

My latest attempt was to follow these instructions to little avail https://www.bacpeters.com/2020/01/25/configuring-the-beaglebone-black-gpio-pins-permanently/

I've also tried disabling the I2C2 following the instructions here http://www.embedded-things.com/bbb/enable-canbus-on-the-beaglebone-black/

And by simply commenting out the I2C2 section in am335x-boneblack or marking it as disabled rather than okay.

 

All attempts appear to be ignored though as config-pin always returns the same error message.

 

Any ideas or pointer to places with working information?

Parents Reply
  • in reply to aswinvenu

    Thanks, I'm working through it to see if I can follow it to enable DCAN0. Two immediate notes:

    1. It's about enabling DCAN1 (I've had no problem with enabling DCAN1, config-pin worked well for that). DCAN0 is the problem since it shares pins with I2C2 (which I don't need but which is automatically enabled)
    2. It's for the green, not the black. Hopefully they've no difference in this area.

     

    Robert

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