I2C to SPi Click Mikroe I2C to SPi Click is an interface between a standard I2C bus of a microcontroller and an SPi bus. This allows the microcontroller to communicate directly with SPi devices through its I2C bus. The Mikroe click is equipped with stacking headers for easy connection. The board controls all SPi bus-specific sequences, protocol, and timing by offering an I2C-bus slave transmitter or receiver and an SPi master. It also has its internal oscillator and supports the SPi chip select output that may be configured as GPIO when not used.