32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
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The steps below let you create and install the firmware file. For
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a .uf2 type file taken from the MicroPython downloads source only
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step 4 is needed. For the .hex version of the firmware file, steps
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1, 3 and 4 are required.
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1. Download and install u2fconv.py. It is available e.g. in the tools
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directory of MicroPython.
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2. Create a firmware for the SEEED nrf52840 if needed, with the command
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`make BOARD=SEEED_XIAO_NRF52 -j5`
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in the directory build-SEEED_XIAO_NRF52-s140. The firmware file will have the
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name firmware.uf2.
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3. Create the .uf2 file if needed in the build directory with the command:
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`uf2conv.py -c -f 0xADA52840 -o firmware.uf2 firmware.hex`
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It must report the start address as 0x27000. If you omit the -o option,
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the output file will have the name flash.uf2.
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4. Enable the upload mode by pushing reset twice or calling
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machine.bootloader() and copy the file firmware.uf2 to the board drive,
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which will pop up on your PC.
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In case the XIAO bootloader is lost or overwritten, it can be found
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at https://github.com/Seeed-Studio/Adafruit_nRF52_Arduino.git in different
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formats. Using a JLINK adapter or interface, it can be uploaded as hex version.
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The bootloader is as well available through the Arduino IDE.
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