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?

[LandyWang]

Hello,

Thank you for your assistance.

I checked the .config file in build\zephyr folder and determined that there is no MPSL related configuration in my nrf5340 audio application.

That means I have to join MPSL myself, but this brings me back to the problem I encountered earlier:

LandyWang said:

My compile error is as follows:

Once added, it will cause a compile error.

Hung Bui said:

CONFIG_BT_CTLR_TX_PWR_ANTENNA should be set in the firmware for the network core (BT_CTRL = Bluetooth controller ) , in your case it can be the ipc_radio remote image.

Thank you for your suggestion, I will try to add CONFIG_BT_CTLR_TX_PWR_ANTENNA in my ipc_radio remote image after solving the other problems.

Hung Bui said:

Seems like the chip  has readback protection. Please check if you have enabled APPROTECT. 

I tried adding the following configuration to prj.conf to disable APPROTECT, but still encountered failed due to memory protection error.

CONFIG_NRF_APPROTECT_USE_UICR=n
CONFIG_NRF_APPROTECT_LOCK=n

[Hung Bui]

Hi Landy, 
I don't think you should use CONFIG_MPSL_FEM_ONLY=y , you only use this if you want to use the radio directly and no BLE. https://docs.nordicsemi.com/bundle/ncs-2.8.0-rc2/page/nrf/app_dev/device_guides/fem/fem_mpsl_fem_only.html

Also please set CONFIG_NRF_APPROTECT_USE_UICR=y , so that the firmware APPROCTECT will follow the UICR. 

[LandyWang]

Thank you.

After I modified sysbuild/ipc_radio.conf to the following, the compile error did not occur again.

CONFIG_MPSL=y
#CONFIG_MPSL_FEM_ONLY=y
#CONFIG_MPSL_FEM_API_AVAILABLE=y
CONFIG_MPSL_FEM_SIMPLE_GPIO=y

But I still don’t see MPSL related configuration in the .config file in build\zephyr folder.

Hung Bui said:

Also please set CONFIG_NRF_APPROTECT_USE_UICR=y , so that the firmware APPROCTECT will follow the UICR. 

After I set CONFIG_NRF_APPROTECT_USE_UICR=y, I still got the error.

C:\WINDOWS\system32>nrfjprog --memrd 0x4000150C --log
[error] [SeggerBackend] - JLinkARM.dll ReadMem returned error 1.
[error] [SeggerBackend] - JLinkARM.dll ReadMem returned error 1.
[error] [SeggerBackend] - JLinkARM.dll ReadMem returned error 1.
[error] [SeggerBackend] - JLinkARM.dll ReadMem returned error 1.
[error] [SeggerBackend] - JLinkARM.dll ReadMem returned error 1.
[error] [  nRF53] - The read access failed due to memory protection.
ERROR: Access to the selected address is blocked by the SPU.

[Elfving]

Hi,

LandyWang said:

But I still don’t see MPSL related configuration in the .config file in build\zephyr folder.

I don't think you need this enabled for it to work.

LandyWang said:

After I set CONFIG_NRF_APPROTECT_USE_UICR=y, I still got the error.

Might be that you need to set this for both images. Since you are using NCS 2.8 and sysbuild, the sysbuild related config mentioned here might help out, as that applies to all images. Keep in mind that SB_* type sysbuild configs need to be added to sysbuild.conf. 

Regards,

Elfving

[LandyWang]

Elfving said:

Might be that you need to set this for both images.

How to set this for both images?

I added "CONFIG_NRF_APPROTECT_USE_UICR=y" to nrf5340_audio\prj.conf and nrf5340_audio\sysbuild\ipc_radio.conf, but still getting the same error.