GPIO operations can be performed through the sys file system interface. When the file system operates GPIO, you must first check whether the GPIO you want to operate is occupied by other drivers. If i
There have been posts before that reflect that when performing UART testing, since the UART interface on the board does not provide power to the development board, two USB cables are required, one for
Although it is just a target reporting device, it is not only used for display, but also has wireless communication and human-computer interaction interface. I have never done interface development in
PMOS tube knowledge. When the gate-source voltage VGS difference is -0.4V, the transistor will conduct.
And if S=2.8V, then G can be turned on when it is less than or equal to 2.4V, and can be turned