Datasheet

For both Hardware and Software SPI, you'll want to set the CS (chip select) line, IRQ (interrupt

request) line and if you have a pin to spare, RST (Reset)

Software SPI Pins

If you don't have a hardware SPI port available, you can use any three pins...its a tad slower

but very flexible

Select the Serial Bus

Once you've configured your pin setup in the BluefruitConfig.h file, you can now check and

adapt the example sketch.

The Adafruit_BluefruitLE_nRF51 library supports four different serial bus options, depending

on the HW you are using: SPI both hardware and software type, and UART both hardware

and software type.

UART Based Boards (Bluefruit LE UART Friend & Flora BLE)

This is for Bluefruit LE UART Friend & Flora BLE boards. You can use

either

software serial or

hardware serial. Hardware serial is higher quality, and less risky with respect to losing data.

However, you may not have hardware serial available! Software serial does work just fine

with flow-control and we do have that available at the cost of a single GPIO pin.

// SHARED SPI SETTINGS

#define BLUEFRUIT_SPI_CS 8

#define BLUEFRUIT_SPI_IRQ 7

#define BLUEFRUIT_SPI_RST 4 // Optional but recommended, set to -1 if unused

// SOFTWARE SPI SETTINGS

#define BLUEFRUIT_SPI_SCK 13

#define BLUEFRUIT_SPI_MISO 12

#define BLUEFRUIT_SPI_MOSI 11

Refer to the table above to determine whether you have SPI or UART controlled

Bluefruits!