stm32 quick learning 5-serial port interrupt reception

Set the serial port clock

Set pin function

Interrupt Priority

Set up the serial port

Main file

#include "stm32f10x.h"

void RCC_Configuration(void);

void GPIO_Configuration(void);

void USART_Configuration(void);

void NVIC_Configuration(void);

int main(void)

{

  RCC_Configuration();

  GPIO_Configuration();

  NVIC_Configuration();

  USART_Configuration();

  while(1);

}

void RCC_Configuration(void)

{    

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);

}

void GPIO_Configuration(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void USART_Configuration(void)

{

  USART_InitTypeDef USART_InitStructure;

  USART_InitStructure.USART_BaudRate = 115200;

  USART_InitStructure.USART_WordLength = USART_WordLength_8b;

  USART_InitStructure.USART_StopBits = USART_StopBits_1;

  USART_InitStructure.USART_Parity = USART_Parity_No;

  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

  USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

  USART_Init(USART1 , &USART_InitStructure);

  USART_Cmd(USART1, ENABLE);

  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); /*Receive interrupt enable*/

}

void NVIC_Configuration(void) 

{ 

  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); 

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; /*3.4 library does not use USART1_IRQChannel, see stm32f10x.h*/

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 

  NVIC_Init(&NVIC_InitStructure); 

}

Stm32f10x_it.c added

void USART1_IRQHandler(void) 

{ 

    unsigned int i; 

    if(USART_GetFlagStatus(USART1,USART_IT_RXNE)==SET) 

    {               

        i = USART_ReceiveData(USART1); 

        USART_SendData(USART1,i); 

        while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) ;              

    }

    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) 

    { 

        /* Clear receive interrupt flag */ 

        USART_ClearITPendingBit(USART1, USART_IT_RXNE);

    }

}