nrf52840 dongle connection

[sharon123321]

Subject: Request for Assistance: Coding BLE and SPI for Gesture Control using nRF52840

Dear nRF Support Team,

I hope this email finds you well. My name is sharon and I am currently working on a project that involves sending gesture data from a mobile app to an LED matrix. I am using the nRF52840 dongle as a BLE interface between my Android application and the LED matrix.

Below is an overview of my setup:

• Mobile App: Custom-built (using Jetpack Compose)
• BLE Interface: nRF52840 dongle
• MCU: S32K118 (communicates with LED driver via SPI)
• Communication Flow:
  1. Phone sends gestures via Bluetooth to nRF52840
  2. nRF52840 communicates with the S32K118 MCU via SPI
  3. S32K118 controls the LED matrix driver (SPI)

I am reaching out to request your assistance with the following:

1. BLE Communication:

   • I need guidance on coding the nRF52840 to receive BLE data from the mobile app.
   • How can I efficiently send gesture data (e.g., touchpad coordinates or patterns) over BLE?

2. SPI Communication:

   • What would be the recommended approach for transferring BLE data from the nRF52840 to the S32K118 via SPI?
   • Are there any reference examples for SPI communication on the nRF52840 that I can follow?

Any code snippets, libraries, or documentation you can provide would be greatly appreciated. Additionally, if there are specific SDK examples or configurations you recommend, I’d be glad to explore those.

Thank you for your time and support. Please let me know if you need any further information from my end.

Best regards,
 iam using vs studio for coding with nrf extension

[Einar Thorsrud]

Hi Sharon,

BLE Communication:

• I need guidance on coding the nRF52840 to receive BLE data from the mobile app.

The nRF Connect SDK suppors most BLE use cases. To get started I suggest you first go through nRF Connect SDK Fundamentals, and then Bluetooth Low Energy Fundamentals.

How can I efficiently send gesture data (e.g., touchpad coordinates or patterns) over BLE?

There are several ways to do this. You can use existing service(s) or a custom service. A simple way to get started is to use the Nordic UART Service (NUS) which gives you a simple data channel. But this is up to you.

What would be the recommended approach for transferring BLE data from the nRF52840 to the S32K118 via SPI?

It is difficult to be specifc here as I don't have experience with S32K118. I am wondering why you need the additional MCU though, why not use the nRF52840 and connect the LED matrix driver directly from that? Do you need an additional MCU?

Are there any reference examples for SPI communication on the nRF52840 that I can follow?

The SDK has some SPI examples, and this is covered in nRF Connect SDK Intermediate.

Br,

Einar

[sharon123321]

can u guide me how send data recieved in dongle via ble to other peripherals via spi i only want to send data from dongle please help how to do and with stepss please

[Einar Thorsrud]

This is a big question that does not have a short answer, and the design of your product is up to you. Please start by going through the material I linked to in my previous post. That will show you all the basics you need to do what you have described.

[sharon123321]

i only want to send data from ble so for this use  i can use nus right?? no back and froth communication

[Einar Thorsrud]

Yes, you can use NUS for this