STM32的USART操作，从零开如讲解，细仔深入，希望能帮到初学者-STM32 USART operation from scratch, such as explaining, careful in-depth, and I hope to help beginners

stm32驱动4X4键盘扫描，用于键盘扫描-/******************************************************************************* * File Name : KeyScan * Descr iption : Serial print out the corresponding key value *************************************************