Sorry, I meant to add that I have tried adding the following to local.conf:
RPI_EXTRA_CONFIG = ' \n \
dtparam=spi=on \n \
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25 \n \
dtoverlay=mcp2515-can1,oscillator=16000000,interrupt=23 \n \
'
However, this did not make any difference to the interrupts.
Since then, I have manually changed mcp2515-can1-overlay.dts in the kernel
build tree (after running bitbake - c do_configure virtual/kernel) and rebuilt
the kernel / image. This does result in the interrupt mapping changing, and
both CAN channels then operate correctly.
Does anyone know why RPI_EXTRA_CONFIG doesn’t appear to be taking effect?
--
Chris Tapp
[email protected]
www.keylevel.com
----
You can tell you're getting older when your car insurance gets real cheap!
> On 1 Oct 2021, at 22:38, Chris Tapp <[email protected]> wrote:
>
> I am having trouble getting the Waveshare 2-CH CAN HAT working with an RPI4.
> Channel 0 does not come up, channel 1 does, but it will only send one message
> (eventually reporting "write: No buffer space available”) and not receive
> anything.
>
> Looking at the mcp2515-can0-overlay.dts and mcp2515-can1-overlay.dts device
> tree files in
> /tmp/work-shared/raspberrypi4/kernel-source/arch/arm/boot/dts/overlays/, it
> looks as if the interrupts are not mapped as required for the board.
>
> DTS HAT
> CAN0 brcm,pins = <25> PIN23
> CAN1 brcm,pins = <25> PIN25
>
> This doesn’t look right, and seems consistent with the behaviour I am seeing.
>
> I would also like to check the device chip select signals, but I can't see
> how (if) they are mapped in the dts files.
>
> How can I override these settings when I build the image?
>
> --
>
> Chris Tapp
> [email protected] <mailto:[email protected]>
> www.keylevel.com
>
>
>
>
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