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FLASHING.md

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Flashing

Flashing via bootloader

This is the recommended way to flash the firmware since it allows for updates over the air (over BLE).

Flashing the bootloader

If you don't already have abootloader installed, you can download it here and flash the hex via nrfjprog, or any other program capable of swd. Here's how to do it using nrfjprog

nrfjprog --chiperase
nrfjprog --program path_to_bootloader.hex
nrfjprog --reset

After that, your device should discoverable under the name "DfuTarg". The device will always boot into bootloader first for a few seconds.

Rebooting into bootloader

If you just installed the bootloader after a wipe, the device is already in bootloader mode. You can proceed with the installation.

If you can cut power to the device, power-cycle it. For a few seconds, you'll be able to connect to the device named "DfuTarg". If you fail to connect in time, power-cycle and try again.

If you can't power-cycle the device, you can restart it by performing the following:

  1. Enable notifications on the characteristic 8e400001-f315-4f60-9fb8-838830daea51
  2. Write the bootloader secret to characteristic 8e400001-f315-4f60-9fb8-838830daea51. You can find and change the secret here
  3. The device should disconnect and reboot into bootloader more. With this way of manually triggering bootloader mode, it will not boot back into the application after a few seconds.

Flashing through bootloader

First, you need to download the application .zip file from the latest release.

You should use an app like "nRF Connect" to connect to the device in bootloader mode named "DfuTarg". There, you can tap on "DFU" and select the zip file. When flashing is done the device will boot back into the application and you are done.

Flashing without bootloader

To flash the hex directly, you can either compile the code yourself or download the nrf51822__xxac.hex from the latest release.

Then, you need to flash the softdevice. This step needs to be done only once, not with every update.

nrfjprog --chiperase
nrfjprog --program path_to_softdevice.hex

Then, flash the application.

nrfjprog --chiperase
nrfjprog --program path_to_application.hex
nrfjprog --reset

And you should be up and running.