The SPI (Serial Peripheral Interface) peripheral in STM32 microcontrollers is a high-speed, full-duplex communication interface designed for efficient data exchange between the MCU and external devices such as sensors, displays, memory chips, and other microcontrollers. The interface was developed by Motorola in the mid-1980s and has become a de facto standard. SPI devices can communicate in full. In this tutorial, we will learn how to use SPI with an STM32 microcontroller step by step. Then, we will move on to configuring the SPI peripheral using STM32CubeMX, making sure all the key parameters such as clock. SPI is an acronym for (Serial Peripheral Interface) pronounced as “S-P-I” or “Spy”. In this guide, we shall discuss what is SPI and how transmit data over SPI.