When is the CRCStatus register valid in the RADIO peripheral? Is it set when the radio leaves RX mode or only after the END event?
When is the CRCStatus register valid in the RADIO peripheral? Is it set when the radio leaves RX mode or only after the END event?
Hi
The CRC status register is valid after the END event occurs, which means that a packet was received.
If you don't get an address match then no packet is received, and the CRC will not be calculated.
Best regards
Torbjørn
You give me 2 answers, ADDRESS or END? If I start the radio in rx mode and the ADDRESS event is triggered(which means a reception is started), and I switch the Radio to RXIDLE right after the ADDRESS event. An incomplete message is received and no END event is triggered. Will The CRCStatus register be valid?
If you ignore the second comment then hopefully my response is more clear:
"The CRC status register is valid after the END event occurs" ;)
If you disable the radio before the END event is triggered the CRC status will not be valid.
As such it is quite common to avoid disabling the receiver in the period between receiving the address match and end events, because then you are most likely discarding a valid packet ("fake" packets do occur, but it happens very rarely if you use a 4 or 5 byte address).
Thank you! I suspected it worked like that, but I could not find a clear answer in the documentation. In my code I wait for the radio to leave rx mode after the ADDRESS event and after that check the CRCStatus to be OK and I check the END event has been triggered.
Sounds good. Keep in mind that you can enable interrupts on any of the events also (which you might be doing already).
