2019年01月29日 | STM32 UART串口驱动程序

示例1.通过UART1进行数据发送

UART 1 的初始化

/**

* @brief  UART1  Initialise.

* @param  None.

* @retval None.

*/

void UART1_Init(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  USART_InitTypeDef USART_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //UART1 选择对应UART的RCC时钟

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //选择串口对应引脚的RCC时钟

  //UART1_TX   GPIOA_Pin_9

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //GPIOC_Pin_9

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //

  GPIO_Init(GPIOA, &GPIO_InitStructure);        //

  //UART1_RX    GPIOA_Pin_10

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //GPIOA_Pin_10

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //UART1通讯参数配置

  USART_InitStructure.USART_BaudRate = 115200;            //通讯波特率

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

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

  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);

}

将数据0xBA通过UART1发送出

USART_SendData(USART1,0xBA); //Send Data 0xBA

----------

示例2.通过对UART1进行接收中断配置,收到外部数据后进入中断读取数据 

UART 1 的初始化 开启接收中断

/**

@brief UART1 Initialise.

@param None.

@retval None.

@brief Data transfer PC

*/

void UART1_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //UART1

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //

//UART1_TX GPIOA_Pin_9

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //GPIOC_Pin_9

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //

GPIO_Init(GPIOA, &GPIO_InitStructure); //

//UART1_RX GPIOA_Pin_10

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //GPIOA_Pin_10

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);

//UART1通讯参数配置

USART_InitStructure.USART_BaudRate = 115200; //通讯波特率

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

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

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);

//Uart1 NVIC 中断配置

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //数据接收中断使能

NVIC_Init(&NVIC_InitStructure);

USART_Cmd(USART1, ENABLE);

}

中断入口函数,变量rxdat用于存放接收到的1个字节数据

void USART1_IRQHandler(void)

{

  unsigned char  rxdat ;

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

  {

    USART_ClearITPendingBit(USART1, USART_IT_RXNE); //Clear flag

    rxdat = USART_ReceiveData(USART1);

  }

}