RADIO Power Control for Register reset

[jake.yoon]

Hello, I'm working on timeslot and RADIO on nRF52840.

I found a sample code which sets 1 to "NRF_RADIO->POWER" to initialize RADIO peripheral.

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/* Reset all states in the radio peripheral */
NRF_RADIO->POWER = 1;
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However, the description in "6.20.14.39 POWER" is somewhat different.

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Peripheral power control. The peripheral and its registers will be reset to its initial state by switching the peripheral off and then back on again.
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It is clearly saying that the POWER should be set to "0' and then "1" like following, isn't it?

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/* Reset all states in the radio peripheral */
NRF_RADIO->POWER = 0;
NRF_RADIO->POWER = 1;
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[Håkon Alseth]

Hi,

 

jake.yoon said:

Do I have to reset the RADIO registers by myself whenever timeslot starts?

No, that should not be necessary. You only need to power it on.

jake.yoon said:

Or SD(Soft Device) resets them or powers down RADIO before calling my timeslot start routine(NRF_RADIO_CALLBACK_SIGNAL_TYPE_START)?

 The Softdevice will power off the RADIO peripheral after every connection interval is finished, to ensure it starts from a known position on the next connection interval it should handle. A timeslot is scheduled after a BLE operation is finished, so the timeslot will be opened up with .POWER=0.

For an example implementation, you can have a look at this blog post:

https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/running-micro-esb-concurrently-with-ble

 

Kind regards,

Håkon

[jake.yoon]

Oh, I got it.

Thank you very much for the link.

Best regards,

Jake