Getting files onto NRF52

[No1089]

Hi,

I finally received my J-link and programmed three different NRF52 boards, but on the one I want to use it most (Ruuvi tag), I am not sure how to load the code. It does not have a serial connection that is enabled(and I have no idea how to get it running), nor a USB port. The WebREPL via webBluetooth is working, but none of the REPL file transfer programs (or Ampy) supports that. I do have a Bluefruit LE Friend (UART) but for that I first need the NRF52 to connect etc.

Is it possible to use SWD to upload the code, instead of transferring the files?

[deshipu]

I think the WebREPL had a file upload functionality?

[No1089]

@deshipu I'm an idiot. I was using the Espruino webREPL - just googled micropython WebREPL - and yes it has that functionality. The documentation on the NRF52 could use some editing - a few steps were missing/unexplained. Thanks.

[No1089]

https://micropython.org/webrepl/? does not allow me to use WebBluetooth :(
This is what I was using: https://glennrub.github.io/webbluetooth/micropython/repl/

[jerryneedell]

There are instructions for adding support for the WebBluetooth here.
https://github.com/adafruit/circuitpython/tree/master/ports/nrf
It is not enabled by default so you will have to create a custom build.

[No1089]

I have done so, and I can access the REPL with this: (https://glennrub.github.io/webbluetooth/micropython/repl/), but unlike (https://micropython.org/webrepl/), there is no option to upload a file so I can get my code running.

[jerryneedell]

Ah - sorry -- I just reread your earlier posts and see that.
Its's not pretty, but I suppose you could compile your code in as a "frozen" module.

[No1089]

@jerryneedell Apologies for my ignorance - but how do I create a frozen module?

[jerryneedell]

It's been awhile since I played with this, but there is an example here:
https://github.com/adafruit/circuitpython/tree/master/ports/nrf/freeze
This is compiled into your build. I think any .py file in the "freeze" folder will also get compiled in. You can then invoke it from the REPL. I don't recall if it gets stored as "freeze/test" or as test.
If you look at help('modules')
should should see it. I'll try to provide an example tonight or tomorrow if you have not gotten it working first.

[jerryneedell]

see: https://github.com/adafruit/circuitpython/blob/master/ports/nrf/Makefile#L360
for how the Makefile handles it.
in line 36 FROZEN_MPY_DIR = freeze

[jerryneedell]

Here is an example executing the freeze/test.py build into the current master

Adafruit CircuitPython 3.0.0-beta.0-43-gde61bd0 on 2018-06-02; Bluefruit nRF52 Feather with NRF52832
>>> 
>>> 
>>> import test
>>> test.hello()
Hello nrf52!
>>>