2.2 KiB
Adafruit nRF52840 Bootloader
This repository contains the USB bootloader for Adafruit nRF52840 boards (1MB flash, 256KB SRAM). This repository depend on the tinyusb as submodule, after cloing this repo you need to run this command
git submodule update --init
Option 1: Build with makefile
Navigate to src/singlebank (recommended) or src/dualbank (work in progress), and use feather52840 target for building bootloader.
make feather52840
To flash bootloader + S140
make flash_feather52840
To only flash S140
make flash_sd
Common makefile problems
1. arm-none-eabi-gcc: No such file or directory
If you get the following error:
$ make feather52840
Compiling file: dfu_single_bank.c
/bin/sh: /usr/bin/arm-none-eabi-gcc: No such file or directory
make: *** [_build/dfu_single_bank.o] Error 127
You make need to edit the Makefile (for example src/singlebank/Makefile),
and update the GNU_INSTALL_ROOT to point to the root path of your GCC ARM
toolchain.
2. mergehex: No such file or directory
Make sure that mergehex is available from the command-line. This binary is
part of of Nordic's nRF5x Command Line Tools.
3. make: nrfjprog: No such file or directory
Make sure that nrfjprog is available from the command-line. This binary is
part of of Nordic's nRF5x Command Line Tools.
On POSIX-type systems you can temporarily add the path to nrfjprog via a
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
For better debugging you can also use SES, The project file is located at src/segger/nrf52840_bootloader.emProject. Note: the SES only flash the bootloader when you click download, you need to flash Softdevice beforehand if you haven't done so ( use make flash_sd mentioned above )