CAN bus protocol counter REC/TEC

martial123

Hi everyone,

I would like to know where are this counters and how I can recover there value in Qt CAN class .

Thank you
Martial

martial123

I have found my answer in the CAN protocol here : https://en.wikipedia.org/wiki/CAN_bus

in fact, when problem occur, node send active frame, after 127 active frame , if error is still here, node send passive error frame, and after 255 , node place in mode buss off.

So we just need to check this type of frame and the type of enum return from Qt lib when we are in mode bus off :

QCanBusDevice::CanBusStatus QCanBusDevice::busStatus() const

Bye

edit:
In fact this is not 127 frame send, because counter increase by 8 bit when error occur but is when counter are 127, node emit passive frame...