This repository contains the Arduino BSP for Hackable nRF52 Smart Watch series using by @ATC1441's DaflasherFiles to enable flashing a custom Arduino firmware to them.

There are two methods that you can use to install this BSP. We highly recommend the first option unless you wish to participate in active development of this codebase via Github.

1. Download and install the Arduino IDE (At least v1.6.12)
2. Start the Arduino IDE
3. Go into Preferences
4. Add https://mhv75.github.io/arduino-board-index/package_atcwatch_index.json as an 'Additional Board Manager URL'
5. Restart the Arduino IDE
6. Open the Boards Manager from the Tools -> Board menu and install 'ATCWatch nRF52 by mhv75'
7. Once the BSP is installed, select a board from the Tools -> Board menu, which will update your system config to use the right compiler and settings for the nRF52.

adafruit-nrfutil (derived from Nordic pc-nrfutil) is needed to upload sketch via serial port.

• For Windows and macOS, pre-built executable binaries are included in the BSP at tools/adafruit-nrfutil/. It should work out of the box.
• Linux user need to run follow command to install it from PyPi

$ pip3 install adafruit-nrfutil --user

To burn the bootloader you will need the following tools installed on your system and available in the system path:

• Segger JLink Software and Documentation Pack
• Nordic nRF5x Command Line Tools

Check to make sure you can run nrfjprog from your terminal/command prompt

macOS Note At present, you will need to create a symlink in /usr/local/bin to the nrfjprog tool wherever you have added it. You can run the following command, for example:

$ ln -s $HOME/prog/nordic/nrfjprog/nrfjprog /usr/local/bin/nrfjprog

Once the tools above have been installed and added to your system path:

This would not have been possible to do without the excellent work of @atc1441 and many more of the hackers who joined him in hacking nrf watches.. This core is based on Arduino-nRF5 by Sandeep Mistry, which in turn is based on the Arduino SAMD Core.

The following libraries are used:

• FreeRTOS as operating system
• LittleFS for internal file system
• nrfx for peripherals driver
• TinyUSB as usb stack