Radio state machine

RE: Radio state machine

Kenneth — Thu, 25 Oct 2018 12:34:48 GMT

[quote user="ErcSic"]When it finishes the lower priority radio ISR gets to run and, hence , a packet is "received" in the RXRU state. What do you think ?[/quote]

That make sense!

I don't have any really good suggestion here how to best handle this. Though I think it is best to have the same interrupt priority in this case, since both interact with the radio peripheral.

Best regards,
Kenneth

RE: Radio state machine

Eric — Wed, 24 Oct 2018 19:32:02 GMT

Kenneth, thank you for the attention.

- I have only one shortcut enabled and that is between READY and START.

- Yes, you are right; value 3 is RX which, off course, makes sense due to the shortcut.

- Since RXEN is "protected" by an assert that the radio is disabled, multiple calls should not be possible. Besides, every radio ISR is finished with a call to TASKS_DISABLE.

Thinking further about this I can come up with one plausable expanation:

Since it is not certain that a packet is transmitted in every slot (or on every frequency if you like) I cannot rely on the RX ISR to switch to the next frequency. Instead this is done by a timer interrupt. However, as it stands, this interrupt has a higher priority than the radio interrupt. Consequently; if a packet is received "too late" the timer ISR has already disabled the radio, switched to the next frequency and initiated "a ramp up". When it finishes the lower priority radio ISR gets to run and, hence , a packet is "received" in the RXRU state. What do you think ?

In any case; what makes most sense as a design choise (and why ?):

1. Timer IRQ has higher priority than the radio IRQ

2. Radio IRQ has higher priority than the timer IRQ

3. Both IRQs have the same priority

4. Radio ISR is disabled. Everything is handled in the timer ISR.

Any suggestion is most welcome

\Eric

RE: Radio state machine

Kenneth — Wed, 24 Oct 2018 14:04:51 GMT

I think you will need to debug a bit further to understand when this is occurring. For instance what radio shorts do you have enabled, a STATE value of 3 is RX (not RXIDLE), is it possible you are triggering RXEN several times without stop or disable? Are you waiting for appropriate events before triggering new task/astate?

Best regards,
Kenneth