With the continuous development of electronic components, components with bottom solder terminals are becoming more and more popular. DRQFN and MQFN are two typical components with bottom solder termi
In the previous two articles, whether using GPIO or interrupts, the application obtains the key value by loop reading, which will cause a high CPU usage. This article first introduces several I/O mode
In electronics theory, when electric current flows through a conductor, a magnetic field is formed around the conductor; when alternating current passes through a conductor, an alternating electromagn