142 lines
5.0 KiB
Markdown
142 lines
5.0 KiB
Markdown
# Adafruit Bluefruit nRF52 Bootloader
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This repository contains the bootloader for Adafruit nRF52 series and other popular boards
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- [Bluefruit Feather nRF52832](https://www.adafruit.com/product/3406)
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- Bluefruit Feather nRF52840 Express
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- Nordic nRF52840DK PCA10056
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[adafruit-nrfutil](https://github.com/adafruit/Adafruit_nRF52_nrfutil), modified version of [Nordic nrfutil](https://github.com/NordicSemiconductor/pc-nrfutil), is required to perform DFU. Install python3 to your system if it is not installed already and run this command to install adafruit-nrfutil from PyPi:
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$ pip3 install --user adafruit-nrfutil
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This repository depends on following submodule
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- [tinyusb](https://github.com/hathach/tinyusb/tree/develop)
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- [nrfx](https://github.com/NordicSemiconductor/nrfx)
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Get the code with following command:
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git clone <URL>.git Adafruit_nRF52_Bootloader
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cd Adafruit_nRF52_Bootloader
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git submodule update --init
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## Features
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- DFU over Serial and OTA ( Application, Bootloader+SD )
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- Self-upgradble via Serial and OTA
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- DFU using USB Flashing Format a.k.a [UF2](https://github.com/Microsoft/uf2) (Applicatoin 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 2 pins **DFU & FRST** that bootloader will check upon reset/power
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- `DFU = Low and FRST = High` Enter DFU with UF2 and CDC support
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- `DFU = Low and FRST = Low` Enter DFU with OTA, can be upgraded with 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` Goto application code if it is present, otherwise enter DFU with UF2
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- Depending on value of the `GPREGRET` register, Bootloader can enter any of above mode (plus a CDC only mode for Arduino). `GPREGRET` is set by application before performing a softreset.
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For the exact pin location, please check your board definition for details
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## Burn & Upgrade with pre-built binaries
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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
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To flash version `6.1.0r0` using jlink
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$ make BOARD=feather_nrf52840_express VERSION=6.1.0r0 flash
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To upgrade with dfu serial
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$ make BOARD=feather_nrf52840_express VERSION=6.1.0r0 dfu-flash
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You can run following command for the list of pre-builtin binaries
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$ ls bin/*
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bin/feather_nrf52832:
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2.0.1 5.0.0 6.1.0r0
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bin/feather_nrf52840_express:
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6.1.0r0
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bin/pca10056:
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6.1.0r0
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Note: bootloader is downgradable, since the binary release is merged of bootloader and Softdevice, you could freely "upgrade" to any version you like.
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## Compile with latest codes
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You should only continue if you are looking to develop bootloader for your own. Having a jlink to **de-brick** your device is a must.
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### Option 1: Build with makefile
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Prerequisite
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- ARM GCC
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- Nordic's [nRF5x Command Line Tools](http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.tools%2Fdita%2Ftools%2Fnrf5x_command_line_tools%2Fnrf5x_installation.html)
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To build
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$ make BOARD=feather_nrf52840_express all
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To flash bootloader
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$ make BOARD=feather_nrf52840_express flash
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To flash SoftDevice (chip erase)
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$ make BOARD=feather_nrf52840_express sd
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To erase chip
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$ make BOARD=feather_nrf52840_express erase
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For the list of supported boards, try to type make without `BOARD=`
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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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### 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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$ 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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... you may need to edit the `Makefile` and update the `GNU_INSTALL_ROOT` to point to the root path of your GCC ARM toolchain.
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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 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 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:/Users/Kevin/Downloads/nRF5x-Command-Line-Tools_9_7_2_OSX/nrfjprog
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```
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### Option 2: Build using Segger Embeded Studio
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For better 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, you need to
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flash Softdevice beforehand if you haven't done so ( use `make BOARD=feather_nrf52840_express sd`
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mentioned above )
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