[riot-notifications] [RIOT-OS/RIOT] nrf802154: take FCS into account for lifs/sifs calculation (#11138)

Semjon Kerner notifications at github.com
Tue Mar 12 16:19:50 CET 2019


This PR again is reasonable, the code looks good and compiles, and ping still works.

However I could not test this PR to my satisfaction and might have found another bug.
**testing:**
I tried with examples/default and sent smaller and larger packets to the short address. With a sniffer I received packets smaller than 18 Bytes (SIFS_MAXPKTSIZE), as desired.

**problem:**
I tried to read the backoff time of the timer with gpios - set gpio directly after `timer_start` and cleared it in the timer callback - but strangely the backoff time scaled with the packetsize. For each additional Byte, let it be 1 or 50 Bytes of payload, the timer took additional 32 us.

Can you reproduce this - might this even be correct behavior?

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