Summary

In this chapter, we learned about the I2C communication protocol. We began by discussing the fundamental principles of the I2C protocol, including its modes of operation, addressing schemes, and the step-by-step communication process.

We then delved into the specifics of the STM32 I2C peripheral, highlighting key registers such as Control Register 1 (I2C_CR1), Control Register 2 (I2C_CR2), the Clock Control Register (I2C_CCR), and the Data Register (I2C_DR).

Finally, we applied this theoretical knowledge to develop a bare-metal I2C driver. This driver allows us to initialize the I2C peripheral, perform both single-byte and burst data transfers, and handle communication with an external device such as the ADXL345 accelerometer.

In the next chapter, we will learn about interrupts, a critical feature in modern microcontrollers that enables responsive and efficient handling of real-time events.