STM32F407串口

#include "stm32f4xx.h"
#include "usart.h"

void My_USART1_Init(void)
{

//GPIO结构体定义
GPIO_InitTypeDef GPIO_InitStructure;

//串口结构体定义
USART_InitTypeDef USART_InitStructure;

//中断结构体定义
NVIC_InitTypeDef NVIC_InitStructure;
//使能时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//使能USART1时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);//使能GPIOA时钟

//引脚映射

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

//端口初始化

//GPIOA9端口初始化结构体参数设置

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

//GPIOA9端口初始化
GPIO_Init(GPIOA, &GPIO_InitStructure);

//GPIOA10端口初始化结构体参数设置

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

//GPIOA10端口初始化
GPIO_Init(GPIOA, &GPIO_InitStructure);

//串口初始化结构体参数设置

USART_InitStructure.USART_BaudRate=115200;
   USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
   USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
   USART_InitStructure.USART_Parity=USART_Parity_No;
   USART_InitStructure.USART_StopBits=USART_StopBits_1;
   USART_InitStructure.USART_WordLength=USART_WordLength_8b;

//串口初始化
USART_Init(USART1,&USART_InitStructure);

//串口使能
   USART_Cmd(USART1 ,ENABLE);
  //中断使能
   USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);//接收非空使能

  //中断初始化结构体参数设置
   NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;

//中断初始化
NVIC_Init(&NVIC_InitStructure);
}

void USART1_IRQHandler(void)
{
u8 res;

//判断串口1
if(USART_GetITStatus(USART1,USART_IT_RXNE)){

//从串口1是否发生接收中断
res=USART_ReceiveData(USART1);

//通过串口1发送数据
USART_SendData(USART1,res);
}

}
int main(void)
{

//中断分组使能
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

//串口初始化
My_USART1_Init();
while(1);
}