The I2C bus is a convenient hardware system mainly because it requires only two wires for communication. The bus is also known by other names, such as the IIC (inter-integrated circuit) or TWI (two-wire interface). Phillips Semiconductor developed the I2C bus, which Intel later extended with the SMBus protocol. These are largely interchangeable, but I will focus on I2C in this chapter.
With the utility of the I2C bus, it is no surprise that the STM32 platform includes a hardware peripheral for it. This chapter will explore how to utilize the peripheral in concert with the PCF8574 GPIO extender device attached ...
