[STM32F1] stm32f1串口发送与接收

/* 串口初始化 */

 

void STM_EVAL_COMInit(USART_InitTypeDef* USART_InitStruct)

{

  GPIO_InitTypeDef GPIO_InitStructure;

 

  /* Enable GPIO clock */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//GPIOA使能

 

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);USART2时钟使能

 

  /* Configure USART Tx as alternate function push-pull */

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//输出PA2

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

 

  /* Configure USART Rx as input floating */

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//输入PA3

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

 

  /* USART configuration */

  USART_Init(USART2, USART_InitStruct);//USART2初始化

    

  /* Enable USART */

  USART_Cmd(USART2, ENABLE);//使能USART2

}

void USART2_Init (void)

{

        USART_InitTypeDef USART_InitStructure;

        NVIC_InitTypeDef NVIC_InitStructure; 

        

        USART_InitStructure.USART_BaudRate = 115200;                  //波特率

  USART_InitStructure.USART_WordLength = USART_WordLength_8b;   //数据位个数=8

  USART_InitStructure.USART_StopBits = USART_StopBits_1;        //1个停止位

  USART_InitStructure.USART_Parity = USART_Parity_No;           //没有校验位

  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

 

  STM_EVAL_COMInit(&USART_InitStructure);

        

        

//数据接收的使能中断

  /* Enable the USARTz Interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;//为USART2

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

        

  /* Enable the USARTz Receive Interrupt */

  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//

}

void SendString (char *s)

{

        while(*s)

        {

                USART_SendData(USART2, *s++);//依次发送

 

  /* Loop until the end of transmission */

  while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET)//TC标志位为reset发送结束

  {}

        }

}

void SendString (char *s)

{

        while(*s)

        {

                USART_SendData(USART2, *s++);

 

  /* Loop until the end of transmission */

  while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)

  {}

        }

}

USART2_Init();//打开串口

SendString("字符串");

int fputc(int ch, FILE *f)

{

  /* Place your implementation of fputc here */

  /* e.g. write a character to the USART */

  USART_SendData(USART2, (uint8_t) ch);

 

  /* Loop until the end of transmission */

  while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)

  {}

 

  return ch;

}

u8 RxCounter = 0;//定义计数值

u8        RxBuffer2[10];//定义缓冲区为10

 

void USART2_IRQHandler(void)

{

  if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)//串口接收中断

  {

    USART_ClearITPendingBit(USART2, USART_IT_RXNE);//清除标志位

                /* Read one byte from the receive data register */

                

    RxBuffer2[RxCounter++] = USART_ReceiveData(USART2);

                

                

                if(RxCounter>6)//定义接收的字节个数

                {

                        RxCounter=0;

                }

}        

}

u8 RxCounter = 0;//定义计数值

u8        RxBuffer2[10];//定义缓冲区为10

 

void USART2_IRQHandler(void)

{

  if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)//串口接收中断

  {

    USART_ClearITPendingBit(USART2, USART_IT_RXNE);//清除标志位

                /* Read one byte from the receive data register */

                

    RxBuffer2[RxCounter++] = USART_ReceiveData(USART2);

                

                

                if(RxCounter>6)//定义接收的字节个数

                {

                        RxCounter=0;

                }

}        

}