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+# hci-dongle
+
+This is the source code used for the nRF52840 used in my [bachelor
+thesis](https://sr.ht/~witcher/bachelor-thesis).
+
+It is taken *verbatim* from
+https://github.com/zephyrproject-rtos/zephyr/tree/f393e2205c2c71d05dcefeffddc4bc429911e12e/samples/bluetooth/hci_usb.  
+The only changes made here are to the `prj.conf` to allow:
+
+* a DLE of 251 bytes
+* 2M PHY mode
+
+## Compiling
+
+Install the [Zephyr
+toolchain](https://docs.zephyrproject.org/latest/develop/getting_started/index.html).
+
+After compiling, the output files will be in `build/zephyr/` in various formats.
+
+### Using CMake/Ninja
+
+Simply invoke the following commands:
+
+```sh
+cmake -Bbuild -GNinja -DBOARD=nrf52840dongle_nrf52840 .
+ninja -Cbuild
+```
+
+### Using [west](https://docs.zephyrproject.org/latest/develop/west/index.html)
+
+```sh
+west build \
+  -p always \
+  -b nrf52840dongle_nrf52840 \
+  .
+```
+
+## Flashing
+
+To flash the image to the nRF52840 Dongle (the dongle used in my bachelor
+thesis), make sure you have
+[`nrfutil`](https://github.com/NordicSemiconductor/pc-nrfutil) installed.
+
+First, generate the required `zip` file from the compiled `hex` one:
+
+```sh
+nrfutil pkg generate \
+  --hw-version 52 \
+  --sd-req=0x00 \
+  --application build/zephyr/zephyr.hex \
+  --application-version 1 \
+  hci_usb.zip
+```
+
+Then, flash that to the board (assumed to be connected to `/dev/ttyACM0`, please
+check before flashing):
+
+```sh
+nrfutil dfu usb-serial \
+  --package hci_usb.zip \
+  -p /dev/ttyACM0
+```
+
+## Resources
+
+Send patches and questions to
+[~witcher/bachelor-thesis@lists.sr.ht](https://lists.sr.ht/~witcher/bachelor-thesis).
+
+Instructions for preparing a patch are available at
+[git-send-email.io](https://git-send-email.io/).
+
+Bugs and todo can be found at
+[~witcher/bachelor-thesis](https://todo.sr.ht/~witcher/bachelor-thesis).