Redbear Labs Nano¶
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.
The nrf51_blenano board configuration supports the following nRF51 hardware features:
|NVIC||on-chip||nested vectored interrupt controller|
Connections and IOs¶
BLE nano pinout
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.
Programming and Debugging¶
To flash an application, you’ll need to connect your BLE Nano with the DAPLink board, then attach that to your computer via USB.
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  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.
# From the root of the zephyr repository west build -b nrf51_blenano samples/hello_world west flash