文章原始地址: http://feotech.com/?p=56




示例1.通過UART1進行數據發送
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 選擇對應UART的RCC時鐘RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //選擇串口對應引腳的RCC時鐘//UART1_TX GPIOA_Pin_9GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //GPIOC_Pin_9GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //GPIO_Init(GPIOA, &GPIO_InitStructure); ////UART1_RX GPIOA_Pin_10GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //GPIOA_Pin_10GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_InitStructure);//UART1通訊參數配置USART_InitStructure.USART_BaudRate = 115200; //通訊波特率USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8個數據位USART_InitStructure.USART_StopBits = USART_StopBits_1; //1個停止位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); }

將數據0xBA通過UART1發送出

USART_SendData(USART1,0xBA); //Send Data 0xBA---------- 示例2.通過對UART1進行接收中斷配置,收到外部數據后進入中斷讀取數據 UART 1 的初始化 開啟接收中斷

/**

• @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通訊參數配置
  USART_InitStructure.USART_BaudRate = 115200; //通訊波特率
  USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8個數據位
  USART_InitStructure.USART_StopBits = USART_StopBits_1; //1個停止位
  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 中斷配置
  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); //數據接收中斷使能
  NVIC_Init(&NVIC_InitStructure);

  USART_Cmd(USART1, ENABLE);
  }

中斷入口函數,變量rxdat用于存放接收到的1個字節數據

void USART1_IRQHandler(void) {unsigned char rxdat ;if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){USART_ClearITPendingBit(USART1, USART_IT_RXNE); //Clear flagrxdat = USART_ReceiveData(USART1);} }

總結

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