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micropython/ports/nrf/boards/seeed_xiao_nrf52/deploy.md
robert-hh 564945a2a0 nrf/boards/seeed_xiao_nrf52: Add defn for Seeed XIAO NRF52840 Sense. 
It keeps compatibility with the XIAO bootloader by:
- using Soft Device 7.3.0
- reserving 48k memory for the bootloader.

So on double reset a drive pops for uploading an uf2 image or a nrfutil zip
pkg file.  Instructions to create it from a hex file are included.  The
bootloader can as well be activated with the touch 1200 option of nrfutil.

The script download_ble_stack.sh has been adapted to get the version 7.3.0
soft device files.  It may have to be executed once before building.

The file system is set to 256k and the pin definitions are adapted.
Besides that, it has the common functionality and omissions.  The on-board
sensors and additional flash can be supported by Python scripts.
2022-12-15 14:27:08 +11:00

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The steps below let you create and install the firmware file. For a .uf2 type file taken from the MicroPython downloads source only step 4 is needed. For the .hex version of the firmware file, steps 1, 3 and 4 are required.

  1. Download and install u2fconv.py. It is available e.g. in the tools directory of MicroPython.

  2. Create a firmware for the SEEED nrf52840 if needed, with the command

    make BOARD=SEEED_XIAO_NRF52 -j5

    in the directory build-SEEED_XIAO_NRF52-s140. The firmware file will have the name firmware.uf2.

  3. Create the .uf2 file if needed in the build directory with the command:

    uf2conv.py -c -f 0xADA52840 -o firmware.uf2 firmware.hex

    It must report the start address as 0x27000. If you omit the -o option, the output file will have the name flash.uf2.

  4. Enable the upload mode by pushing reset twice or calling machine.bootloader() and copy the file firmware.uf2 to the board drive, which will pop up on your PC.

In case the XIAO bootloader is lost or overwritten, it can be found at https://github.com/Seeed-Studio/Adafruit_nRF52_Arduino.git in different formats. Using a JLINK adapter or interface, it can be uploaded as hex version. The bootloader is as well available through the Arduino IDE.