SCuM Programmer

Use an nRF52840-DK and a Python script to program SCuM!

Prerequisites

Setup the nRF52840-DK

• Download scum-programmer.hex
• Plug in your nRF52840-DK into your computer, drive "JLINK" appears
• Drag-and-drop scum-programmer.hex onto this drive

Interact with SCuM's serial port

• Connect SCuM's UART to an USB-to-UART converter
• Open the serial port corresponding to your USB-to-UART converter using a serial terminal, using 19200 baud. For example using Socat on Linux:

  socat - open:/dev/ttyUSB0,b19200,echo=0,raw,cs8,parenb=0,cstopb=0
  

Python script installation

The scum-programmer command line tool is published on PyPI:

pip install scum-programmer

Usage

Load code onto SCuM

The scum-programmer command requires a firmware input file in .bin format. Use it as following:

scum-programmer path/to/scum-firmware.bin

On Windows, the nRF J-Link TTY port cannot be detected automatically and needs to be set manually using the --port option. For example:

scum-programmer --port COM42 path/to/scum-firmware.bin

Calibrate SCuM

If the application requires calibration, use the --calibrate option to trigger the calibration after booting SCuM:

scum-programmer --calibrate path/to/scum-firmware.bin

Build the nRF firmware

• Install SEGGER Embedded Studio for ARM
• Open scum_programmer/scum-programmer.emProject
• Select the scum-programmer project and build it (F7)
• Download it on the nRF using the Target > Download scum-programmer menu