In this article, we will introduce the USB protocol layer. Please see our previous article for information regarding the physical layer and network topology: An Introduction to USB Communication (Part 1). USB is a polled bus where the host initiates all transactions. For the host to receive information from USB devices, it must request it

USB (Universal Serial Bus) is an industry-standard used to specify cables, connectors, and protocols that are used for communication between electronic devices. Advantages: Self-configuring interface, no need for user configuration of speed, data protocol, etc.Capable of supplying power to small auxiliary devicesVarious communication speeds are supportedStandard connectorsError checking increases the communication reliability Limitations: Limited cable

Writing programs that just work would make the development of embedded systems a lot easier. In practice, however, a considerable amount of time is devoted to finding and removing bugs from the code. This process is commonly known as debugging and there is no way of avoiding it. In this article, we will give an