The main purpose of designing the <span>poll</span> method in Linux device drivers is to support non-blocking I/O and multiplexing, allowing applications to efficiently monitor the readiness state of multiple devices. Here is a detailed analysis: Design Objectives Support Non-Blocking I/O Allows user programs to monitor the status of multiple file descriptors (such as readable, writable, … Read more
Source: https://blog.csdn.net/twx11213030422 Embedded Miscellaneous Layout What is a Framework? A programming framework is similar to a file outline or template. Writing a program is akin to writing an article; without an outline or template, it can be quite cumbersome. Why Have a Framework? To save time and reduce errors. For a specific type of program, … Read more
Four Ways for APP to Access Hardware References: Four Ways for APP to Access Hardware (64~67) Four Ways for APP to Access Hardware For example, how does a mother know if her baby has woken up while sleeping? How does a mother know if the child in the bedroom has woken up? 1. Occasionally going … Read more
Follow+Star PublicAccount, don’t miss out on exciting content Author | strongerHuang WeChat Public Account | strongerHuang The UART serial port is a common communication method in embedded development, but many people still do not know how to use the serial port. Today, I will share a few points about serial ports: Serial Port Receiving Methods … Read more
Follow+Star Public Account, don’t miss the wonderful content Source | Technology Makes Dreams Greater After a week of testing the waters, I’m ready to sit at home and code, and catch up on my writing. Just as I was focused on outputting, my wife interrupted me. The baby is crying, come quickly! There was a … Read more
1. From Polling to Interrupt Many students prefer polling over interrupt-driven operations. Is this related to our nature? Everyone likes to have everything under control and dislikes being interrupted. We often have experiences where we are talking to someone and suddenly receive a phone call, and after the call, we can’t remember what we were … Read more