sandeepmistry
ESP32 with internally used SJA1000 hangs completely up when CAN wires are shorted
Dear all,
In my application, the ESP32 completely gets stuck after about 1sec. if I short the CAN wires (CAN-J and CAN-L connected). Unfortunately I couldn't manage to reset the ESP32 as the internal watchdog timer only resets CORE0 and not CORE1. Does anyone have any idea/solution?
Thank you!
Alex
im not shure if it is a good idea to short the wires anyways... if your project is made for this kind of Errors why not use some isolation IC with build in CAN tranciver?
does this error occure when you want to send a message or while reading the bus?
Dear Petros144,
Shorting the wires is just a fault simulation. Normally the microcontroller should return to normal operation and not completely hang up (the watchdog timer cannot reset it directly from the Arduino programming environment). However, I have connected an ESP32 output pin to the external ESP32 reset pin, now I can reset it reliably.
I think the main issue is that I cannot catch any generated CAN error code (once the CAN error counter counts up) as the error codes of the internal SJA1000 CAN controller are not supported at all yet. I have mentioned this in the previous issue.
I haven't tried yet, but I believe that an isolated CAN node will make no difference. Once the bus is shorted the error counter will be at its limit at no time and the ESP32 will hang.
Thank you for your input,
Alex
also this is maybe interresting:
http://www.barth-dev.de/can-driver-esp32/