STM32L152 USART

STM32 USART 总结

第一步：usart初始化

UART_HandleTypeDef huart3;
uint8_t rxbuf;


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void MX_USART3_UART_Init(void)
{
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
HAL_UART_Init(&huart3);
}

//串口gpio初始化

void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
   GPIO_InitTypeDef GPIO_InitStruct;
  if(huart->Instance==USART3)
  {


    /* Peripheral clock enable */
    __HAL_RCC_USART3_CLK_ENABLE();
    /**USART3 GPIO Configuration
    PB10     ------> USART3_TX
    PB11     ------> USART3_RX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF7_USART3;;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
    /* Peripheral interrupt init */
    HAL_NVIC_SetPriority(USART3_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USART3_IRQn);


  }
}

//串口反初始化

void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
{
  if(huart->Instance==USART3)
  {
    /* Peripheral clock disable */
    __HAL_RCC_USART3_CLK_DISABLE();


    HAL_GPIO_DeInit(GPIOB, GPIO_PIN_10|GPIO_PIN_11);
    /* Peripheral interrupt DeInit*/
    HAL_NVIC_DisableIRQ(USART3_IRQn);
  }
}

//串口中断回调函数（响应事件）

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if(huart->Instance==USART3)
{
//加入处理事件
HAL_UART_Receive_IT(&huart3,&rxbuf,1);//ʹÄÜ´®¿Ú½ÓÊÕ£¬½øÈëÖжϻص÷º¯Êý
}
}

在STM32L1XX_it.c中加入中断函数

void USART3_IRQHandler(void)
{
HAL_UART_IRQHandler(&huart3);
}

主函数相关代码

int main(void)
{
HAL_Init( );
SystemClock_Config();
MX_GPIO_Init( );
MX_USART3_UART_Init();
HAL_UART_Receive_IT(&huart3,&rxbuf,1);      //使能串口中断，有串口中断便进入中断回调函数
while(1)
{
}
}