The Hardware Implementation of a Register-configurable SPI Interface

Abstract

The Serial Peripheral Interface (SPI) is a synchronous serial communication protocol commonly used in embedded systems, facilitating the connection between microcontrollers and peripheral devices such as sensors, displays, and memory. Traditional SPI hardware implementations often lack flexibility in clock frequency, clock polarity (CPOL), and clock phase (CPHA), limiting their adaptability in various applications and increasing development time and cost. To address these issues, this study designs and implements a configurable SPI module that can dynamically adjust parameters such as clock frequency, data bit width, CPOL, and CPHA through register control. The core of this design adopts a modular architecture that allows flexible configuration via register control, ensuring compatibility with different SPI modes and peripheral devices. Simulation tests have verified that the SPI module achieves the expected dynamic flexibility across multiple operation modes while ensuring communication accuracy and system stability.The configurable SPI module enhances the adaptability of embedded system communication protocols, reducing the need for hardware redesigns for specific applications. This register-based dynamic SPI design holds significant practical value in engineering applications and helps improve hardware development efficiency.