nrf21540 Dk radio test example testing

[Muhammad Usman]

Hi All!

I am using nrf21540 DK, NCS V2.3.0, and Vscode Studio. 

An example I am using is the radio test. Build and loaded the code into the nrf21540 Dk. And Run the following commands on uart terminal 

On RSSI Viewer (connected the nrf52833 DK)

VScde 

I also monitored the SPI Signals on P1.13 ,1.14, and 1.15  but no signal during I was sending the commands as mentioned on the top.

my proj.conf file is 

CONFIG_CONSOLE_HANDLER=y
CONFIG_SHELL=y

CONFIG_DYNAMIC_INTERRUPTS=y

CONFIG_NRFX_TIMER0=y

CONFIG_ENTROPY_GENERATOR=y


CONFIG_MPSL=y
CONFIG_MPSL_FEM=y
CONFIG_MPSL_FEM_ONLY=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SPI=y
CONFIG_MPSL_FEM_NRF21540_RX_GAIN_DB=0
CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=20

Can you please help me in this regard where is the issue that I am getting a lower dbm value.

Thanks & Regards,

Muhammad Usman

[Priyanka]

Hi Muhammad,

Just to make sure, you have referred this documentation and build similar to what is mentioned here?

Best Regards,

Priyanka

[Muhammad Usman]

Hi Priyanka Gopal 

I followed the following link as well 

 NRF21540 Shield + NRF52833 DK - lower RSSI with shield than without 

 but still the same results. can you please help me in this regard?

Best Regards,

Muhammad Usman

[Muhammad Usman]

Hi, 

Thank you, I will wait for your response!

Thanks & Regards,

Muhammad Usman

[Muhammad Usman]

Hi Priyanka!

Any response from your team? Is there any other way to confirm that nrf21540 is operational or not? Or is any example available to read the internal registers of nrf21540 via SPI? 

Thanks & Regards

[Priyanka]

Hi Muhammad,

We just resumed work today after the holidays. Since there are a lot of cases, and few staff, there might be a bit delay. I will get back to you tomorrow with a response.

-Priyanka

[Priyanka]

Hi Muhammad,

Have you tried this command?

You can also check this:

The KConfig will only set the gain of the FEM, and the TX output power of the nRF will be reduced to compensate this and will match the total system power set.

Please find the user interface commands here.

Also, is these also don't help, have you tried a previous SDK version, say v2.0.0?

[Muhammad Usman]

Hi Priyanka!

Thank you for the help! 

yes, I tried all these as you mentioned. i got -23dm if i set out put power between -4 to 4 dbm

1)Is it working properly ?

2)How i can confirm?

3)As the Radio Test sample is not officially supported for nrf21540Dk. Then what changes can we make it work for nrf21540DK?

4)Is there any way to read the Internal Configuration registers of nrf21540 to confirm it's working?

Thanks & regards,

Muhammad Usman

[Priyanka]

Hi,

Muhammad Usman said:

i got -23dm if i set out put power between -4 to 4 dbm

If you  got this as the received RSSI, then it depends on the receiver side if it's proper or not.

As for the radio test sample, you don't need any changes to be done. You just have to select the proper build target, i.e. build it for the nRF21540DK and this should be fine.

-Priyanka

[Muhammad Usman]

thank you so much for the help!

Thanks & Regards,

Muhammad Usman