IQ sampling in BLE payload

[Jasperbrg]

Hello,

For my project I am interested in performing IQ sampling in the payload of a BLE packet, using nRF52833 at both receiver and transmitter.

I am manually configuring the RADIO peripheral at the receiver. As far as I understand, the bit DFECTRL1.DFEINEXTENSION should do the trick for me, by setting it to 0. However, modifying that bit by writing 0 to that bitfield does not change anything. It stays set to 1.

When I start the debugger and manually flip the bit at a breakpoint using the register editor, it seems to do the trick and the device behaves as expected. How can I achieve this without using the debugger?

This is the function I use to configure the sampling procedure.

void aoa_radio_rx_init(){
    NRF_RADIO->DFEMODE |= (RADIO_DFEMODE_DFEOPMODE_AoA << RADIO_DFEMODE_DFEOPMODE_Pos);
    NRF_RADIO->CTEINLINECONF |= (RADIO_CTEINLINECONF_CTEINLINECTRLEN_Disabled << RADIO_CTEINLINECONF_CTEINLINECTRLEN_Pos);
    NRF_RADIO->DFECTRL1 |= (RADIO_DFECTRL1_DFEINEXTENSION_Payload << RADIO_DFECTRL1_DFEINEXTENSION_Pos);
    NRF_RADIO->DFECTRL1 |= (RADIO_DFECTRL1_SAMPLETYPE_IQ << RADIO_DFECTRL1_SAMPLETYPE_Pos);
    NRF_RADIO->DFECTRL1 |= (RADIO_DFECTRL1_TSWITCHSPACING_2us<<RADIO_DFECTRL1_TSWITCHSPACING_Pos);
}

 

[rishab jay]

Thanks for the detailed explanation — this really helps clarify how IQ sampling works in BLE payloads!
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