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# Adafruit Bluefruit nRF52 Bootloader
This repository contains the bootloader for Adafruit nRF52 series board
This repository contains the bootloader for Adafruit nRF52 series and other popular boards
- [Bluefruit Feather nRF52832](https://www.adafruit.com/product/3406)
- Bluefruit Feather nRF52840
- Nordic nRF52840DK PCA10056
## Features
This bootloader is meant to use with [adafruit-nrfutil](https://github.com/adafruit/Adafruit_nRF52_nrfutil), a folk of [Nordic nrfutil](https://github.com/NordicSemiconductor/pc-nrfutil). To install
### nRF52832
$ pip3 install --user adafruit-nrfutil
- DFU over Serial and OTA ( Application, Bootloader+SD )
- DFU auto start to work with Arduino DTR auto-reset
### nRF52840
- DFU over USB CDC and OTA ( Application, Bootloader+SD )
- DFU using USB Flashing Format a.k.a [UF2](https://github.com/Microsoft/uf2) (Applicatoin only)
## Compile
This repository depend on following submodule
This repository depends on following submodule
- [tinyusb](https://github.com/hathach/tinyusb/tree/develop)
- [nrfx](https://github.com/NordicSemiconductor/nrfx)
@ -31,6 +21,31 @@ Get the code with following command:
cd Adafruit_nRF52_Bootloader
git submodule update --init
## Features
- DFU over Serial and OTA ( Application, Bootloader+SD )
- Self-upgradble via Serial and OTA
- DFU using USB Flashing Format a.k.a [UF2](https://github.com/Microsoft/uf2) (Applicatoin only)
- Auto enter DFU briefly on startup for DTR auto-reset trick (832 only)
## Burn & Upgrade
You can burn and/or upgrade bootloader with either jlink or dfu (serial) to a specific pre-built binary version without the hassle to install toolchain and compile the code. This is preferred if you are not developing/customizing the bootloader
To flash version `6.1.0r0` using jlink
$ make BOARD=feather52840 VERSION=6.1.0r0 flash
To upgrade with dfu serial
$ make BOARD=feather52840 VERSION=6.1.0r0 dfu-flash
Note: bootloader is downgradable, since the binary release is merged of bootloader and Softdevice, you could freely "upgrade" to any version you like.
## Compile
Please only continue if you are looking to develop bootloader for your own. Having a jlink to **de-brick** your device is a must.
### Option 1: Build with makefile
Prerequisite
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$ make BOARD=feather52840 flash
To flash SoftDevice (with full chip erase)
To flash SoftDevice (chip erase)
$ make BOARD=feather52840 sd
To full erase chip
To erase chip
$ make BOARD=feather52840 erase
@ -91,7 +106,7 @@ variation on the following command:
$ export PATH=$PATH:/Users/Kevin/Downloads/nRF5x-Command-Line-Tools_9_7_2_OSX/nrfjprog
```
## Option 2: Build using Segger Embeded Studio
### Option 2: Build using Segger Embeded Studio
For better debugging you can also use [SES](https://www.segger.com/products/development-tools/embedded-studio/).
The project file is located at `src/segger/Adafruit_nRF52_Bootloader.emProject`.