203 lines
7.5 KiB
Markdown
203 lines
7.5 KiB
Markdown
# Adafruit nRF52 Bootloader
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[](https://github.com/adafruit/Adafruit_nRF52_Bootloader/actions)
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This is a CDC/DFU/UF2 bootloader for nRF52 boards.
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- [Adafruit Feather nRF52832](https://www.adafruit.com/product/3406)
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- [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062)
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- [Adafruit Circuit Playground Bluefruit](https://www.adafruit.com/product/4333)
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- Adafruit Metro nRF52840 Express
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- [Electronut Labs Papyr](https://docs.electronut.in/papyr/)
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- MakerDiary MDK nRF52840 USB Dongle
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- [Nordic nRF52840DK PCA10056](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK)
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- [Nordic nRF52840DK PCA10059 ("Dongle")](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-Dongle)
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- Particle Argon
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- Particle Boron
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- Particle Xenon
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UF2 is an easy-to-use bootloader that appears as a flash drive. You can just copy `.uf2`-format
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application images to the flash drive to load new firmware.
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See https://github.com/Microsoft/uf2 and https://github.com/adafruit/uf2-samdx1
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for more information.
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[adafruit-nrfutil](https://github.com/adafruit/Adafruit_nRF52_nrfutil),
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a modified version of [Nordic nrfutil](https://github.com/NordicSemiconductor/pc-nrfutil),
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is required to perform DFU.
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Install `python3` if it is not installed already and run this command to install adafruit-nrfutil from PyPi:
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```
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$ pip3 install --user adafruit-nrfutil
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```
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This repository depends on the following submodules:
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- [tinyusb](https://github.com/hathach/tinyusb)
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- [nrfx](https://github.com/NordicSemiconductor/nrfx)
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Note that `tinyusb` also includes `nrfx` as a submodule, so you need
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to initialize and update submodules with the `--recursive`` flag.
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Clone this repo with following commands, or fork it for your own development
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```
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git clone https://github.com/adafruit/Adafruit_nRF52_Bootloader
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cd Adafruit_nRF52_Bootloader
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git submodule update --init --recursive
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```
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## Features
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- DFU over Serial and OTA ( application, Bootloader+SD )
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- Self-upgradable via Serial and OTA
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- DFU using UF2 (https://github.com/Microsoft/uf2) (application only)
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- Auto-enter DFU briefly on startup for DTR auto-reset trick (832 only)
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## How to use
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There are two pins, `DFU` and `FRST` that bootloader will check upon reset/power:
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- `Double Reset` Reset twice within 500 ms will enter DFU with UF2 and CDC support (only works with nRF52840)
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- `DFU = LOW` and `FRST = HIGH`: Enter bootloader with UF2 and CDC support
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- `DFU = LOW` and `FRST = LOW`: Enter bootloader with OTA, to upgrade with a mobile application such as Nordic nrfConnect/Toolbox
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- `DFU = HIGH` and `FRST = LOW`: Factory Reset mode: erase firmware application and its data
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- `DFU = HIGH` and `FRST = HIGH`: Go to application code if it is present, otherwise enter DFU with UF2
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- The `GPREGRET` register can also be set to force the bootloader can enter any of above modes (plus a CDC-only mode for Arduino).
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`GPREGRET` is set by the application before performing a soft reset.
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On the Nordic PCA10056 DK board, `DFU` is connected to **Button1**, and `FRST` is connected to **Button2**.
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So holding down **Button1** while clicking **RESET** will put the board into USB bootloader mode, with UF2 and CDC support.
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Holding down **Button2** while clicking **RESET** will put the board into OTA (over-the-air) bootloader mode.
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On the Nordic PCA10059 Dongle board, `DFU` is connected to the white button.
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`FRST` is connected to pin 1.10. Ground it to pull `FRST` low, as if you had pushed an `FRST` button.
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There is an adjacent ground pad.
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For other boards, please check the board definition for details.
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### Making your own UF2
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To create your own UF2 DFU update image, simply use the [Python conversion script](https://github.com/Microsoft/uf2/blob/master/utils/uf2conv.py) on a .bin file or .hex file, specifying the family as **0xADA52840**. If using a .bin file with the conversion script you must specify application address with the -b switch, this address depend on the SoftDevice size/version e.g S140 v6 is 0x26000
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To create a UF2 image from a .bin file:
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```
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uf2conv.py firmware.bin -c -b 0x26000 -f 0xADA52840
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```
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To create a UF2 image from a .hex file:
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```
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uf2conv.py firmware.hex -c -f 0xADA52840
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```
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## Burn & Upgrade with pre-built binaries
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You can burn and/or upgrade the bootloader with either a J-link or DFU (serial) to a specific pre-built binary version
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without the hassle of installing a toolchain and compiling the code.
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This is preferred if you are not developing/customizing the bootloader.
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Pre-builtin binaries are available on GitHub [releases](https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases)
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Note: The bootloader can be downgraded. Since the binary release is a merged version of
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both bootloader and the Nordic SoftDevice, you can freely upgrade/downgrade to any version you like.
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## How to compile and build
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You should only continue if you are looking to develop bootloader for your own.
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You must have have a J-Link available to "unbrick" your device.
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### Option 1: Build with Makefile
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Prerequisites
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- ARM GCC
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- Nordic's [nRF5x Command Line Tools](https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Command-Line-Tools)
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To build:
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```
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make BOARD=feather_nrf52840_express all combinehex
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```
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To flash the bootloader with JLink:
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```
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make BOARD=feather_nrf52840_express flash
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```
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To upgrade the bootloader using DFU Serial via port /dev/ttyACM0
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```
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make BOARD=feather_nrf52840_express SERIAL=/dev/ttyACM0 dfu-flash
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```
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To flash SoftDevice (and chip erase):
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```
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make BOARD=feather_nrf52840_express sd
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```
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To erase all of flash:
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```
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make BOARD=feather_nrf52840_express erase
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```
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For the list of supported boards, run `make` without `BOARD=` :
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```
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$ make
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You must provide a BOARD parameter with 'BOARD='
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Supported boards are: feather_nrf52840_express feather_nrf52840_express pca10056
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Makefile:90: *** BOARD not defined. Stop
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```
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### Common makefile problems
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#### 1. `arm-none-eabi-gcc`: No such file or directory
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If you get the following error ...
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```
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$ make BOARD=feather_nrf52840_express all
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Compiling file: main.c
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/bin/sh: /usr/bin/arm-none-eabi-gcc: No such file or directory
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make: *** [_build/main.o] Error 127
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```
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... you may need to pass the location of the GCC ARM toolchain binaries to `make` using
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the variable `GNU_INSTALL_ROOT` as below:
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```
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$ make GNU_INSTALL_ROOT=/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/ BOARD=feather_nrf52832 all
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```
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_Please note that the path needs a trailing path separator (a `/`)_
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#### 2. `mergehex: No such file or directory`
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Make sure that `mergehex` is available from the command-line. This binary is
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part of Nordic's nRF5x Command Line Tools.
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#### 3. `make: nrfjprog: No such file or directory`
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Make sure that `nrfjprog` is available from the command-line. This binary is
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part of Nordic's nRF5x Command Line Tools.
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On POSIX-type systems you can temporarily add the path to `nrfjprog` via a
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variation on the following command:
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```
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$ export PATH=$PATH:/location/of/nRF5x-Command-Line-Tools_9_7_2_OSX/nrfjprog
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```
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### Option 2: Build using Segger Embedded Studio
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For easier debugging you can also use [SES](https://www.segger.com/products/development-tools/embedded-studio/).
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The project file is located at `src/segger/Adafruit_nRF52_Bootloader.emProject`.
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> **Note**: SES only flashes the bootloader when you click download, not the SoftDevice.
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You need to flash the SoftDevice beforehand if you haven't already done so.
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As mentioned above do something like:
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```
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make BOARD=feather_nrf52840_express sd
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```
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