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Setup

The Electronut Labs Blip board is a development board based on the nRF52840 SoC from Nordic Semiconductors. It has a Black Magic Probe compatible programmer and debugger built in, along with temperature/humidity sensor, ambient light intensity sensor, and a 3-axis accelerometer. It can be used to prototype very low power devices. It also has provision for an SD card slot, which makes it a complete and versatile development board.

Schematic, datasheet, pin mapping etc. can be found over here.

Features:

Raytac MDBT50Q-1M module based on Nordic Semiconductor's nRF52840
LIS2DDH12 High-performance 3-axis "femto" accelerometer
Optical Sensor LTR-329ALS-01
Si7006-A20 I2C humidity and temperature sensor
On board STM32F103CBT6 as Black magic probe debugger
NFC Antenna
MicroSD slot
Power Supply: USB, JST connector for Li-ion/Li-po
BQ24079 battery charging and power management IC

Installing CircuitPython submodules

Before you can build, you will need to run the following commands once, which will install the submodules that are part of the CircuitPython ecosystem, and build the mpy-cross tool:

$ cd circuitpython
$ git submodule update --init
$ make -C mpy-cross

Building and Flashing CircuitPython

No special notes for this, follow ports/nrf generic README.md.

Flashing CircuitPython with GDB using on board Black magic probe debugger

$ cd ports/nrf
$ make V=1 SD=s140 SERIAL=/dev/ttyACM0 BOARD=electronut_labs_blip all
...
...
LINK build-electronut_labs_blip-s140/firmware.elf

778588 bytes free in flash out of 1048576 bytes ( 1024.0 kb ).
228320 bytes free in ram for stack out of 245760 bytes ( 240.0 kb ).

Create build-electronut_labs_blip-s140/firmware.bin
Create build-electronut_labs_blip-s140/firmware.hex
Create build-electronut_labs_blip-s140/firmware.uf2
python3 ../../tools/uf2/utils/uf2conv.py -f 0xADA52840 -c -o "build-electronut_labs_blip-s140/firmware.uf2" build-electronut_labs_blip-s140/firmware.hex
Converting to uf2, output size: 540160, start address: 0x26000
Wrote 540160 bytes to build-electronut_labs_blip-s140/firmware.uf2.

Now you can use either .hex or .elf from the generated files inside build-electronut_labs_blip-s140 directory. Now you can use arm-none-eabi-gdb to flash circuitpython on Blip.

Other tips

Once circuitpython is running on your board, it will come up as a mass storage device named CIRCUITPY, where you can drop in your python code. The file names it looks for are main.py, main.txt, code.py or code.txt.

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