[riot-notifications] [RIOT-OS/RIOT] nrf802154/hal: fix unwanted emissions at the end of ACK frame (#15766)

José Alamos notifications at github.com
Thu Jan 14 11:25:11 CET 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
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### Contribution description
This commit turns off the transceiver immediately after sending an ACK frame in order to avoid unwanted emissions (see ERRATA ID 204).
When the radio stays in TX_ON without an explicit transition, the radio keeps sending a spurious signal for some milliseconds.

Check the following picture to see how this looks like (using the SDR, Y axis is RF power, X axis is time, first frame is the CC2538 and the second one is the ACK of the nrf802154)

And this is how it looks with this PR:

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- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure
Hard to test without an SDR, but at least make sure that some ping stress tests still work ok.
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### Issues/PRs references
None so far
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * cc2538_rf/radio_hal: fix transmit function
  * nrf802154/hal: fix unwanted emissions at the end of ACK frame

-- File Changes --

    M cpu/cc2538/radio/cc2538_rf_radio_ops.c (7)
    M cpu/nrf52/radio/nrf802154/nrf802154_radio.c (5)

-- Patch Links --


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