about nRF52-ble-long-range-demo

RE: about nRF52-ble-long-range-demo

ovrebekk — Tue, 04 Oct 2022 12:12:47 GMT

Yes, this should be the same on the S140, as long as you use the same version number or newer. Older versions of the SoftDevices did not have support for controlling PA/LNA devices.

Best regards
Torbjørn

RE: about nRF52-ble-long-range-demo

Dai.Ima — Tue, 04 Oct 2022 00:57:46 GMT

Thank you for your reply.

I read the blog you introduced. In the blog, the case of S132 was described. I understand that it is the same when applied to others (for example, S140), is that correct?

Best Regards

Dai.Ima

RE: about nRF52-ble-long-range-demo

ovrebekk — Mon, 03 Oct 2022 07:50:07 GMT

Essentially you should call this function after you have enabled the SoftDevice, before you start any BLE activity (like advertising). It would make sense to include it as a part of the GAP initialization phase.

If you have a look at this old blog, it includes an example function showing how you can use this function to enable external PA/LNA.

Best regards
Torbjørn

RE: about nRF52-ble-long-range-demo

Dai.Ima — Thu, 29 Sep 2022 11:16:40 GMT

Thank you for your reply.

I have a question.

To enable the sd_ble_opt_set(..) function, What part of the firmware should I change? Also, in order to enable the sd_ble_opt_set(..) function, are there any other preparations other than the app and firmware you provide?

Best Regards

Dai.Ima

RE: about nRF52-ble-long-range-demo

ovrebekk — Wed, 28 Sep 2022 16:14:49 GMT

Many of the Bluetooth SoftDevices support automatic control of TX enable and RX enable pins for use with PA/LNA solutions, yes.

You can enable these signals on any pins you like, by using the sd_ble_opt_set(..) function, and all the GPIO pins are available on pin headers on the nRF52840DK.

Just make sure to select pins that aren't already used for something else, such as buttons or LED's.

Best regards
Torbjørn

RE: about nRF52-ble-long-range-demo

Dai.Ima — Tue, 27 Sep 2022 00:19:30 GMT

Thank you for your support.

I understand the RSSI displayed on the central side and it needs to have an LNA to boost the RSSI seen on the central side.

When I use LNA or FEM, I know that I need a signal to control the LNA. Does the nRF52840-DK have ports for extracting control signals like TXEN(Tx enable) and RXEN(Rx enable)? If it doesn't exist, do we have to modify it ourselves?

Best Regards,

RE: about nRF52-ble-long-range-demo

ovrebekk — Mon, 26 Sep 2022 14:28:08 GMT

The RSSI displayed on the central side should be the signal strength of the incoming signal from the peripheral.

In other words if you add a FEM on the central side it needs to have an LNA (rather than a PA) to boost the RSSI seen on the central side.

Best regards
Torbjørn

RE: about nRF52-ble-long-range-demo

Dai.Ima — Thu, 22 Sep 2022 10:40:25 GMT

Hi,

I got everything working.

But I have a question. RSSI display in Central. Is this Central's RSSI or Peripheral's RSSI?

As next step, I added FEM between A and nRF82540 on Central side, but RSSI didn't change with or without FEM. I want to determine whether it is due to the operation of FEM.

Best Regards,

RE: about nRF52-ble-long-range-demo

ovrebekk — Thu, 22 Sep 2022 07:04:05 GMT

Does that mean you now got everything working, or do you still have some issues getting the demo to run?

Best regards
Torbjørn

RE: about nRF52-ble-long-range-demo

Dai.Ima — Wed, 21 Sep 2022 09:26:51 GMT

Hi,

Thank you for your reply.

I checked the board, the firmware was stored in flash memory.

I think I misunderstood that the firmware update method was wrong and the LED didn't light up,

so the firmware wasn't saved.

Best regards

RE: about nRF52-ble-long-range-demo

ovrebekk — Wed, 21 Sep 2022 09:04:44 GMT

[quote user=""]c. When the writing of the software is completed, the power of the board is turned off, and it is restarted, the software disappears. Is this due to lack of memory?[/quote]

This shouldn't happen, no. The firmware is stored in flash memory, which will be retained during power down.

If you press the reset button on the board after it wakes up will the code start running then?

Did you remember to reconnect the RTT viewer application after powering up the board?

Best regards
Torbjørn

RE: about nRF52-ble-long-range-demo

Dai.Ima — Wed, 21 Sep 2022 07:54:08 GMT

Hi,

I have solved question a and b. The cause is that there was a flaw in writing the demo software to nRF52840-DK.

I was able to confirm that the RSSI value was displayed on Teraterm according to the procedure you showed.

Please answer question C.

Best Regards,