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How to add Skyworks fem to nrf5340 audio

LandyWang

Hello,

I am using nrf5340 audio sample with the custom board. The nRF Connect SDK version I used is v2.7.0.

I referred to this post and tried to add skyworks fem to my nrf5340 audio application.

The following is the part I modified:

nrf5340_audio_dk_nrf5340_cpunet.overlay

/ {
    nrf_radio_fem: pa_lna {
        compatible = "skyworks,sky66112-11", "generic-fem-two-ctrl-pins";
        ctx-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
        ctx-settle-time-us = < 23 >;
        crx-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;
        crx-settle-time-us = < 5 >;
        cps-gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
        tx-gain-db = < 13 >;
        rx-gain-db = < 14 >;
    };
};
&radio {
	fem = <&nrf_radio_fem>;
};

nrf5340_audio_dk_nrf5340_cpuapp.overlay

/ {
    nrf_radio_fem: pa_lna {
        compatible = "skyworks,sky66112-11", "generic-fem-two-ctrl-pins";
        ctx-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
        ctx-settle-time-us = < 23 >;
        crx-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;
        crx-settle-time-us = < 5 >;
        cps-gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
        tx-gain-db = < 13 >;
        rx-gain-db = < 14 >;
    };
};

prj.conf

CONFIG_MPSL=y
CONFIG_MPSL_FEM_ONLY=y
CONFIG_MPSL_FEM_SIMPLE_GPIO=y

But it doesn't seem to work.

Is there any way to add skyworks fem to nrf5340 audio application?

Parents
  • 0

    Hello again, and once again sorry about the wait. Please contact your local RSM if the help you are getting here isn't prompt enough. And let me know if you need his contact info.

    LandyWang said:

    But I don’t quite understand with the step 4 of the document. Does it mean creating a child image/hci_ipc.overlay file to the nrf5340 audio application? But in NCS v2.7.0, the child image has been replaced by sys build. What should I do to apply the devicetree node to the network core?

    Hmm yeah that part is a bit confusing, though it is explaining how one would do it with the legacy/non-sysbuild way. In the old system you would just add a dts overlay file to a childimage folder, like you mentioned. You can build it without sysbuild if you prefer, using "--no-sysbuild" or the 'No sysbuild' checkbox when making a build configuration in VSC:

     

    In order to build it with sysbuild, you essentially do the same thing but call the folder sysbuild. 

    LandyWang said:

    I tried adding hci_ipc.overlay in sysbuild/ipc_radio, but it seems that fem has no effect.

    Could you make sure that the hci_ipc.overlay have any effect there, by for instance adding some jibberish to the overlay and check if it still builds.

    I think you should either place a file called nrf5340dk_nrf5340_cpunet.overlay in sysbuild/hci_ipc/, or in child_image/hci_ipc/, but there are different ways of doing this in sysbuild and it is a bit confusing to me too.

    Regards,

    Elfving

  • 0 in reply to Elfving

    Thank you for your reply.

    I tried adding jibberish to the overlay and check if it still builds to ensure that the hci_ipc.overlay have effect.

    Whether hci_ipc.overlay is placed in sysbuild/hci_ipc/ or child_image/hci_ipc/, it seems to have no effect. The same goes for changing the file name to nrf5340dk_nrf5340_cpunet.overlay.

    Selecting the 'No sysbuild' checkbox when making a build configuration in VSC has the same result.

    It looks like I can't apply the devicetree node to the network core.

  • 0 in reply to LandyWang

    Hi,

    Using a skyworks FEM for this should still be possible.

    So if I understand you correctly, you can confirm that the FEM is increasing the antenna power, but you've tried this earlier in NCS 2.2, and you got an even better result there. Was this previous result with the same nRF, hw, antenna power config, and value set in the tx power register?

  • 0 in reply to Elfving

    Yes, I use the same nRF, hw, antenna power config, and confirmed that the value set in the tx power register is also 0dbm in NCS 2.2.0.

    I got better results in NCS 2.2.0.

  • 0 in reply to LandyWang
    LandyWang said:

    I found during testing that removing the settings in the overlay, which is where the specified part is added, does not affect the TX power read by nrfjprog.

    If the range did not increase then I would suspect that the overlay is not being taken into account, but if it is increasing but not as much as in a previous NCS version I am not that sure..

    Could you confirm that the output increases even more when increasing the total output power further?

    Regards,

    Elfving

  • 0 in reply to Elfving

    After I adjusted CONFIG_BT_CTLR_TX_PWR_ANTENNA to close to the maximum value: 120, the TX power read by nrfjprog was still 0 and the distance did not increase.

    I think the maximum value of Tx power should be 0, so increasing CONFIG_BT_CTLR_TX_PWR_ANTENNA will have no effect.

    Elfving said:
    Could you confirm that the output increases even more when increasing the total output power further?

    How to do this ?

  • 0 in reply to LandyWang
    LandyWang said:
    How to do this ?

    The way you checked the connection distance is what I had in mind. Though it looks like it isn't effecting anything. 

    Btw, could you make sure that CONFIG_BT_CTLR_TX_PWR_ANTENNA is set on the netcore? 

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