What could make nRF52840 radio hang in TXDISABLE state?

[Paddy]

I have a very simple test program to run the radio through the transmit sequence, each task is called from the radio interrupt handler according to each event. The process works correctly through the sequence (disabled>txru>txidle>tx>txidle>txdisable), but then stops in TXDISABLE, never returning to the DISABLED state.

Edit-> I've tried with and without shortcuts (ie END_DISABLE), both methods produce the same behaviour.

[Hung Bui]

Hi Paddy,

Have you tried the radio example in the SDK ?

Have you made sure you clear the NRF_RADIO->EVENTS_DISABLED before you call TASK_DISABLE ?

[Paddy]

I have tried it, maybe I'll go back to it- the issue is I'm trying to get IEEE802.15.14 working (not using the openthread code as I need it to work in a different way). I am clearing the previous event (END) before calling disable, I'm not clearing the disabled event but I'm pretty sure it wasn't set. I shall check.

[Hung Bui]

The sequence we have in the example and what you are doing are very similar , maybe you can compare and check what could be the difference can cause the issue.

[Paddy]

Clearing the disabled event immediately before calling the disable task (even though it always appeared to be clear while debugging) seems to have done the job. Thanks

[Ed]

Paddy, I am trying to do the exact same thing you are to verify radio states using ESB. Can you provide your example code to run through these states?