hello Karis,
here’re my updates…
- Which pin is tx and rx of canbus?
see comment #7,
- ttyTCU0 fail
may I know what’s your actual use-case?
please check $ dmesg | grep "command line" for the details of the console settings,
- I connect a i2c device,but I can’t see the device in any i2c bus.
it usually a regulator issue to make i2c registrations failed. you may dig into kernel logs to see if any i2c no ack failures.
- GPIO fail
GPIO can’t drive much load, the resistor of LED is too little, that will grab too much current and so the voltage on little resistor will be much less than 3.3V. please check Topic 54279 as see-also.