嵌入式STM32学习——串口USART 2.2（串口中断接收）

实现串口接收

库函数实现串口接收

软件流程设计

初始化系统

• 初始化GPIO、串口外设、LED时钟
• 初始化串口和LED引脚

串口发送控制LED灯

usart.c

#include"stm32f10x.h"
#include"usart.h"
#include "stdio.h"

void my_usart_init(void)
{
	GPIO_InitTypeDef GPIOInitstruct;
	USART_InitTypeDef Usart_initstruct;
	NVIC_InitTypeDef NVIC_Usart_Initstruct;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);
	
	//A9  TX
	GPIOInitstruct.GPIO_Pin = GPIO_Pin_9;
	GPIOInitstruct.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIOInitstruct.GPIO_Speed = GPIO_Speed_10MHz;
	GPIO_Init(GPIOA,&GPIOInitstruct);
	//A10  RX
	GPIOInitstruct.GPIO_Pin =GPIO_Pin_10;
	GPIOInitstruct.GPIO_Mode =GPIO_Mode_IPU;
	GPIO_Init(GPIOA,&GPIOInitstruct);
	
	//´®¿Ú1
	Usart_initstruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;		//ģʽ								
	Usart_initstruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;		//Ó²¼þ¿ØÖÆÁ÷¹¦ÄÜ£¬Í¨¹ý¶îÍâµÄÐźÅÏߣ¨RTS/CTS£©À´Ð­µ÷Êý¾Ý´<<Ê䣬·ÀÖ¹Êý¾ÝÒç³ö
	Usart_initstruct.USART_BaudRate = 115200;						//²¨ÌØÂÊ
	Usart_initstruct.USART_Parity = USART_Parity_No;		//УÑéÎ>>
	Usart_initstruct.USART_StopBits = USART_StopBits_1;  		//Í£Ö¹Î>>
	Usart_initstruct.USART_WordLength = USART_WordLength_8b;  		//Êý¾ÝÎ>>
	USART_Init(USART1,&Usart_initstruct);
	USART_Cmd(USART1,ENABLE);																											//ʹÄÜ´®¿ÚÍâÉè
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  //NVIC分组
	USART_ITConfig( USART1,  USART_IT_RXNE,  ENABLE); //中断线，检查串口接收缓冲区是否有数据
	NVIC_Usart_Initstruct.NVIC_IRQChannel = USART1_IRQn;
	NVIC_Usart_Initstruct.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_Usart_Initstruct.NVIC_IRQChannelSubPriority = 0;
	NVIC_Usart_Initstruct.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_Usart_Initstruct);
}

void My_Usart_Send_Byte(USART_TypeDef* USARTx, uint16_t Data)
{
			USART_SendData(USARTx,  Data);
			while( USART_GetFlagStatus( USARTx,  USART_FLAG_TXE) == RESET);
		
}
	
void My_Usart_Send_Sting( USART_TypeDef* USARTx, char * string)
{
		uint16_t i=0;
		do
		{
				My_Usart_Send_Byte(USARTx,*(string+i));
				i++;
		}while(*(string+i) != '\0');
		
		while( USART_GetFlagStatus( USARTx,  USART_FLAG_TC) == RESET);
}


int fputc(int ch, FILE * p)									//printfÖض¨Òå
{
		USART_SendData(USART1,  (u8)ch);
		while( USART_GetFlagStatus( USART1,  USART_FLAG_TXE) == RESET);
		return ch;
}

main.c

#include "stm32f10x.h"
#include "main.h"
#include "led.h"
#include "bear.h"
#include "key.h"
#include "shake.h"
#include "usart.h"
#include "stdio.h"
void delay(uint16_t time) 
{
	uint16_t i=0;
	while(time--)
	{
		i =12000;
		while(i--);
	}

}
 
int  main() 
{

		my_usart_init();
//	My_Usart_Send_Byte( USART1,  'A');
//	My_Usart_Send_Byte( USART1,  'B');
//	My_Usart_Send_Byte( USART1,  'C');
//	My_Usart_Send_Sting( USART1,  "\r\n");
//	My_Usart_Send_Sting(USART1 , "fei \r\n");
	printf("Hello,shi \r\n");
	
	while(1)
	{
			
	}		
}

void EXTI0_IRQHandler()  //中断函数
{
	if(EXTI_GetITStatus(EXTI_Line0) != RESET)
	{
			GPIO_ResetBits(GPIOA,GPIO_Pin_1);
			
		
			EXTI_ClearITPendingBit(EXTI_Line0);			//Çå³ýÍⲿÖжϱêÖ¾Î>>£¬ÒªÓëEXTI_GetITStatus´îÅäʹÓÃ
	
	}
}

void USART1_IRQHandler()
{
		char receive_data;
		if(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET)//获取中断标志位，检查接收接收数据寄存器非空
		{
				receive_data =  USART_ReceiveData(USART1);			//获取接收数据
				printf("receive data:  %c \r\n", receive_data);  //输出接收数据并输出
				USART_ClearITPendingBit(USART1,  USART_IT_RXNE);	//清除串口接收数据寄存器非空中断标志位

		}

}

实验结果