stm32f4简单串口实现

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




void My_USART1_Init(void)
{
	GPIO_InitTypeDef  GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
  	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//使能USART1时钟
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
	
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);
  // 这里可以写在一起的
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|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;
	
    GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	USART_InitStructure.USART_BaudRate=115200;
	USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
	//接收和发送都具备
	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;
	
	USART_Init(USART1,&USART_InitStructure);
	USART_Cmd(USART1 ,ENABLE);
  
	// 这里只打开了接收中断
	USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
	// 中断配置完，再初始化；这串口一样，GPIO也是这样
	NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
	NVIC_Init(&NVIC_InitStructure);

}
// 串口接收完成后，若接收中断开启，会自动触发中断
// main 中 跳到中断响应程序中的
void USART1_IRQHandler(void)
{
	u8 res;
	// 判断接收中断的标志位
	if(USART_GetITStatus(USART1,USART_IT_RXNE))
	{
		// 接收，存到Res
		res=USART_ReceiveData(USART1);
		// 这个有立刻发送给外设了...
		USART_SendData(USART1,res);
	}

}
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	My_USART1_Init();
	while(1);
}

标签：ENABLE,USART,串口,NVIC,InitStructure,简单,stm32f4,GPIO,USART1
来源： https://blog.csdn.net/weixin_47289438/article/details/110411041