nRF52 Adafruit Feather¶
The nRF52 Adafruit Bluefruit Feather hardware provides support for the Nordic Semiconductor nRF52832 ARM Cortex-M4F CPU and the following devices:
- RADIO (Bluetooth Low Energy)
- Segger RTT (RTT Console)
More information about the board and its features can be found at the Adafruit Feather nRF52 Bluefruit Learning Guide . The Nordic Semiconductor Documentation library  contains the processor’s information and the datasheet.
- nRF52832 ARM Cortex-M4F processor at 64 MHz
- 32.768 kHz crystal oscillator
- 512 KiB flash memory and 64 KiB of SRAM
- Battery connector and charger for 3.7 V lithium polymer batteries
- Charging indicator LED
- 2 User LEDs
- Reset button
- SWD connector
- USB serial converter
The nRF52 Adafruit Feather board configuration supports the following hardware features:
|NVIC||on-chip||nested vectored interrupt controller|
Other hardware features are not supported by the Zephyr kernel.
Programming and Debugging¶
nrf52_adafruit_feather board is available in two different versions:
Applications for the
nrf52_adafruit_feather board configuration can be
built and flashed in the usual way (see Build an Application
and Run an Application for more details); however, the standard
debugging targets are not currently available.
Flashing Zephyr onto the
nrf52_adafruit_feather board requires an external
J-Link programmer. The programmer is attached to the X1 SWD header.
Follow the instructions in the Nordic nRF5x Segger J-Link page to install and configure all the necessary software. Further information can be found in Flashing. Then build and flash applications as usual (see Build an Application and Run an Application for more details).
Here is an example for the Hello World application.
Build the Zephyr kernel and the Hello World sample application:
west build -b nrf52_adafruit_feather samples/hello_world
Using CMake and ninja:
cmake -B build -GNinja -DBOARD=nrf52_adafruit_feather samples/hello_world ninja -C build
Connect the Adafruit nRF52 Feather to your host computer using USB
Run your favorite terminal program to listen for output.
$ minicom -D <tty_device> -b 115200
<tty_device>with the port where the nRF52 Adafruit Feather board can be found. For example, under Linux,
Flash the image:
Using CMake and ninja:
cmake -B build -GNinja -DBOARD=nrf52_adafruit_feather samples/hello_world ninja -C build flash
You should see “Hello World! arm” in your terminal.
|||(1, 2) https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/introduction|