XIAO RA4M1 CAN BUS RX/TX pinout clarification needed as well as example code

[wavejumper00]

Is your feature request related to a problem? Please describe.
The "getting started" page for the RA4M1 shows the CAN TX/RX pins twice in the pinouts. Please clarify which pins are the correct to use.

In this file:
docs/Sensor/SeeedStudio_XIAO/SeeedStudio_XIAO_RA4M1/XIAO-RA4M1.md

On the “front” side pinout of the “getting started” page, it shows D9 as CRX0 and D10 as CTX0. And on the “back” side pinout, it shows D17 as CRX0 and D18 as CTX0. I don’t think they are in two places so I think there may be an issue in the pinout doc.

Describe the solution you'd like
I would like the documentation updated to show the correct set of pins to use. As well an example of how to use them.

Describe alternatives you've considered
I would have to experiment by soldering to different points on the board. I don't want to have to do that.

Additional context
It is also unclear how to use these native CAN TX/RX pins to connect directly to an external transceiver chip. An example would be very helpful. The only example (in the "pin multiplexing" document) seems to show connecting the SPI pins to an external controller which then connects to an external transceiver. I would like to use the native CAN TX/TX pins on the RA4M1 to connect directly to external transceiver.

Thank you.

[github-actions]

👋 @wavejumper00

Thank you for raising an issue. We will investigate into the matter and get back to you as soon as possible.
Please make sure you have given us as much context as possible.

[wavejumper00]

I got help on the forum to see that the pinout indeed looks correct per the datasheet and schematic.

https://forum.seeedstudio.com/t/xiao-ra4m1-can-network/283137

But it is still unclear how to select which of the two locations I want to use. And which CAN library I should use and how to set it up. I would still like help with code examples.

Thank you.