Redbear Labs Nano

Overview

The Nano is a development board equipped with Nordic’s nRF51822 Bluetooth Low Energy SOC. This board is available on RedBear Store [1].

Hardware

nRF51 BLE Nano has two external oscillators. The frequency of the slow clock is 32.768 kHz. The frequency of the main clock is 16 MHz.

Supported Features

The nrf51_blenano board configuration supports the following nRF51 hardware features:

Interface Controller Driver/Component
NVIC on-chip nested vectored interrupt controller
RTC on-chip system clock
UART on-chip serial port
GPIO on-chip gpio
FLASH on-chip flash
RADIO on-chip Bluetooth

Connections and IOs

BLE nano pinout

BLE Nano

DAPLink board

DAPLink

The DAPLink USB board acts as a dongle. DAPLink debug probes appear on the host computer as a USB disk. It also regulates 5V from USB to 3.3V via the onboard LDO to power Nano.

More information about Nano and DAPLink can be found at the RedBear Github [2].

Programming and Debugging

Applications for the nrf51_blenano board configuration can be built and flashed in the usual way (see Build an Application and Run an Application for more details).

Flashing

To flash an application, you’ll need to connect your BLE Nano with the DAPLink board, then attach that to your computer via USB.

Warning

Be careful to mount the BLE Nano correctly! The side of the board with the VIN and GND pins should face towards the USB connector. The RedBear Store [1] page links to a tutorial video that shows how to properly solder headers and assemble the DAPLink and BLE Nano boards.

Now build and flash applications as usual. Here is an example for the Hello World application.

Using west:

# From the root of the zephyr repository
west build -b nrf51_blenano samples/hello_world
west flash

Using CMake and ninja:

# From the root of the zephyr repository
# Use cmake to configure a Ninja-based buildsystem:
cmake -B build -GNinja -DBOARD=nrf51_blenano samples/hello_world

# Now run ninja on the generated build system:
ninja -C build
ninja -C build flash

Debugging

After mounting the BLE Nano on its DAPLink board as described above, you can debug an application in the usual way. Here is an example for the Hello World application.

Using west:

# From the root of the zephyr repository
west debug

Using CMake and ninja:

# From the root of the zephyr repository
# If you already ran cmake with -Bbuild, you can skip this step and run ninja directly.
cmake -B build -GNinja -DBOARD=nrf51_blenano samples/hello_world

# Now run ninja on the generated build system:
ninja -C build debug