I got a CAN UNIT that connects with the GROVE interface.
When I tried the code linked below in the test, it worked on M5Stack Fire, but not on M5Stack Basic.
I assigned the TX and RX settings to GROVE PORTA.
It worked with this content on Fire.
I also confirmed it with M5Stic-C, but it still did not work.
Are there any settings that I have forgotten?

https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/CAN