power for radio state DISABLED

RE: power for radio state DISABLED

Marco — Fri, 28 Apr 2017 06:04:49 GMT

In my case, if I perform

NRF_RADIO->POWER = 0;

my nRF52 halts and stop the execution instantaneously.

Can anyone explain why?

Thank you

RE: power for radio state DISABLED

Susheel Nuguru — Tue, 08 Sep 2015 06:49:50 GMT

enabling and disabling(TASKS_XXEN and TASKS_DISABLE) is different from powering radio on and off. The registers values are only reset on NRF_RADIO->POWER = 1. After that enabling and disabling will retain their values.

When you do NRF_RADIO->POWER = 0, then the register values are undefined. This is why the values are reset when the RADIO is powered on to bring them to a defined state.

RE: power for radio state DISABLED

Jeff — Mon, 07 Sep 2015 20:06:18 GMT

Say the radio registers are written while the radio is enabled. Then the radio is disabled and then re-enabled? What is the state of the registers when radio is re-enabled after the disable?

RE: power for radio state DISABLED

Susheel Nuguru — Mon, 07 Sep 2015 09:32:12 GMT

For your first question I do not have a direct answer, but you can calculate it yourself by measuring the current before and after powering on radio.

NRF_RADIO->POWER control the state of the regulator that drives the radio. Setting NRF_RADIO->POWER = 0, means that regulator is switched off and hence any reads from this registers will have undefined values.