Intefacing Adafruit Feather nRF52 Bluefruit LE with Raspberry pi?

[KKaushik]

I'm working on Electronic Shelf Label project using Feather nRF52 with Raspberry pi for server connection. I need to Adafruit Feather nRF52 to receive data from raspberry pi and send the data to specific slave via Bluetooth. How do I connect Adafruit Feather nRF52 with Raspberry Pi.

[Einarh]

Hello!

What Raspberry Pi model are you using? As far as I know there has been built-in Bluetooth since Raspberry Pi 3?

Have you programmed BLE before?

I would recommend going through this tutorial to learn the basics if you are not familiar with it:

https://github.com/edvinand/custom_ncs_ble_service_sample

Best regards,

Einar

[KKaushik]

Hello,

I have worked on HC-05 and ESP32 BLE before, but now as the project requirement is high power efficiency, the nRF52 series seems the best option.

Using Raspberry Pi for a temporary basis later I'll use a different controller so I can't remove nRF52 from the gateway node.

I'll go through the link for the basics of nRF52 BLE programming but there is mentioned it requires nRF52840 DK but I have Adafruit Feather nRF52 Bluefruit LE - nRF52382.

Thanks

[Einarh]

An nRF52840 DK is used in the tutorial, but BLE programming is done the same way on your device.

You won't have the DK's buttons and leds available, but the tutorial should still be helpful in understanding how BLE programming works.

[KKaushik]

Regarding my original question, Communication between Raspberry Pi and nRF52 module: I meant using a wired connection between Raspberry Pi and nRF52 module, as raspberry will read data from the online server and transfer it to the nRF52 module (wired connection).

BLE will be used between two nRF52 modules (slave and master configuration).

So I wanted to know some example code or interfacing connection between the nRF52 module and Raspberry pi.

Note: By nRF52 module: Bluefruit nRF52 feather, I am using this for the development phase, for final I'll use just chip.

[Einarh]

I see, sounds like you'd want to use UART maybe?

Note that using UART and BLE simultaneously can be problematic because of the BLE stack's strict timing constraints. One solution to this problem would be to consider using the nRF53 chip, where you can run the BLE code on its own core. If you are determined to use the nRF52 I would recommend using the UARTE API in order to send and receive data directly to/from RAM:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fuarte.html

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfx/drivers/uarte/driver.html

-Einar