STM32L476G-discover的串口HAL库移植

源码：https://github.com/jimingkang/STM32L476_BSP

IDE里代码结构

1）stm32l4xx_it.c 设置NVIC的串口中断处理程序

extern UART_HandleTypeDef huart2;

void USART2_IRQHandler(void)
{
  /* USER CODE BEGIN USART2_IRQn 0 */

  /* USER CODE END USART2_IRQn 0 */
  HAL_UART_IRQHandler(&huart2);
  /* USER CODE BEGIN USART2_IRQn 1 */

  /* USER CODE END USART2_IRQn 1 */
}

 

2）uart.c设置硬件，以及中断模式收发

void UART2_Init(void) {
    // Enable the clock of USART 1 & 2
    RCC->APB1ENR1 |= RCC_APB1ENR1_USART2EN;  // Enable USART 2 clock        
    
    // Select the USART1 clock source
    // 00: PCLK selected as USART2 clock
    // 01: System clock (SYSCLK) selected as USART2 clock
    // 10: HSI16 clock selected as USART2 clock
    // 11: LSE clock selected as USART2 clock
    RCC->CCIPR &= ~RCC_CCIPR_USART2SEL;
    RCC->CCIPR |=  RCC_CCIPR_USART2SEL_0;
    
    UART2_GPIO_Init();
    USART_Init(USART2);
    //这里打开中断，上一篇文章没开中断（直接是阻塞模式），
    NVIC_SetPriority(USART2_IRQn, 0);            // Set Priority to 1
    NVIC_EnableIRQ(USART2_IRQn);                    // Enable interrupt of USART1 peripheral
}

3）在main.c直接调用硬件初始化：

UART_HandleTypeDef huart2;
/**
  * @brief  Main program
  *         The program follows the following steps
  *         -1- LEDs initialization.
  *         -2- User-based LEDs management: all the LEDs are turned on and the user
  *         can next turn on/off/toggle the LEDs in resorting to the Wakeup/Tamper
  *         button or to the Joystick.
  *         Pressing the SEL joystick button turns on all the LEDs
  * @retval None
  */
static void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 9600;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_Init 2 */

}

int main(void)
{ uint8_t n=0;
  uint8_t i = 0;
  uint8_t menudisplay[DEMO_NAME_CHAR_NB + 5] = {0};

  HAL_Init();
  /*##-1- Configure the system clock #########################################*/
  /*  */
  SystemClock_Config();
    EXTI0_IRQHandler_Config();
  /*##-2-Configure minimum hardware resources at boot ########################*/
  SystemHardwareInit();

//这里借用上一篇文章的硬件初始化（https://blog.csdn.net/conjimmy/article/details/102657881）  

 UART2_Init();

//这里借用STM32Cubemx（见图2）生成，我拷贝过来放到main()上面，主要就是设置huart2结构体
MX_USART2_UART_Init();
    

//直接调用中断方式发送
  uint8_t aTxStartMessages[] = "\r\ntest jimmy";

  HAL_UART_Transmit_IT(&huart2 ,(uint8_t*)aTxStartMessages,sizeof(aTxStartMessages));

图2