STM32 usart 问题笔记
1、USART 手册上给的基础配置源码有误,应该为: USART_InitTypeDef USART_InitStructure; USART_ClockInitTypeDef USART_ClockInitStructure; USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLen