Use Segger JLink USB drive as means to configure my device through a configuration file

[dragilla]

Hi,

When I plug in my NRF51 Dongle it shows up in Windows explorer as additional drive (JLINK). Can I use this medium to configure my application? Can I read a file pun on this drive in my application running on my NRF51 Dongle? I would just put a simple config file and then read the parameters inside the app.

Thanks

[dragilla]

So what would be the easiest way to pass configuration to my app? By easiest I mean most straightforward for a user of my device but also not too complicated to implement.

A mobile app communicating via Bluetooth would be great, but that would be too much of an investment for me :)

[awneil]

dragilla said:

most straightforward for a user of my device

Knowing nothing about your device or your users, that's pretty much impossible to say

dragilla said:

A mobile app communicating via Bluetooth would be great, but that would be too much of an investment for me

So how do users normally communicate with your device? Can't you use that path? What interfaces do you have available?

UART ?

NFC?

If you were happy to use the J-Link, have that write the config info into Flash?

[awneil]

If you've got UART over USB, I'd have thought that'd be the simplest thing to use?

[awneil]

In fact, it looks like you might actually be able to get to the USB MSC storage of the J-Link:

https://os.mbed.com/handbook/How-mbed-works#how-the-localfilesystem-works

(assuming Segger have implemented this?)

[awneil]

There's also RTT - that can do Host-to-Target as well as Target-to-Host  

[dragilla]

Can anyone from Nordic / Segger confirm this is possible and tell me how to do it? :)

[dragilla]

In my previous post I was referring to the link that you provided (about the JLINK storage). 

About RTT and UART - both would require writing a native app, because regular users don't what a terminal is. This might be the was it ends, but I'm still hoping to access the storage :)

[awneil]

dragilla said:

I was referring to the link that you provided (about the JLINK storage)

This one: https://os.mbed.com/handbook/How-mbed-works#how-the-localfilesystem-works ?

As that's defined by mbed (ie, ARM) it should be independent of the microcontroller used.

Segger should be able to confirm if they have (fully) implemented it:

https://forum.segger.com/index.php/Board/3-J-Link-Flasher-related/

dragilla said:

About RTT and UART - both would require writing a native app

Indeed.