GPIO全称General Purpose Input Output ，即通用输入/输出。其实GPIO的本质就是芯片的一个引脚，通常在ARM中所有的I/O都是通用的。不 ...

The GPIO expansion is useful in any application for the number of GPIOs on a microprocessor is not sufficient. The relatively small numbers of GPIOs on microprocessors are becoming a limiting factor ...

Driving multiple LEDs with one microprocessor GPIO pin is a well-known technique. Typically, designs perform this task by issuing pulse widths and clocks of differing durations and employing multiple ...