In this chapter, we learned about the I²C bus, and how we can use the Linux device drivers to access the I²C device. We also explored how we can write our own I²C driver as a user-space application.

However, even if the I²C bus is widely used in every embedded computer, and a large variety of I²C peripherals exist, another on-board bus can be found on most systems, that is, the SPI bus and its devices. So, now, it's time to go to the next chapter.