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STM32G070CBT6采用定时器实现1秒内发送N次数据

article 2025/3/25 20:03:44

注：此处的N取值为1-10。

1.定时器配置

STM32CubeMX配置定时器可以参看文章：

使用STM32CubeMX配置定时器中断实现LED每秒闪烁一次（STM32G070CBT6）_stm32cubemx 怎么配置tim3 定时器-CSDN博客

将定时器的定时间时间配置为10ms，此处我的主频设置的是48M。

/* TIM3 init function */
void MX_TIM3_Init(void)
{

  /* USER CODE BEGIN TIM3_Init 0 */

  /* USER CODE END TIM3_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  /* USER CODE BEGIN TIM3_Init 1 */

  /* USER CODE END TIM3_Init 1 */
  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 48-1;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 10000-1;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM3_Init 2 */

  /* USER CODE END TIM3_Init 2 */

}

2.功能实现函数

发送率功能函数

volatile int LaserSendCount = 0;    //激光数据发送计数值
volatile int LaserSendInterval = 100;   //初始为1次/秒（100*10ms=1000ms）
volatile unsigned char LaserTxFlag = 0;    //激光发送标志位


//激光发射率函数（发/秒），每秒发送多少个激光包，1-10
static void Laser_Rate(unsigned char rate)
{
    if(rate < 1)
    {
        rate = 1;
    }
    if(rate > 10)
    {
        rate = 10;
    }
    LaserSendInterval = 100 / rate;     //计算中断阈值
    
    if(LaserTxFlag) //激光发送标志位
    {
        LaserTxFlag = 0;
        //测试使用
        HAL_UART_Transmit_DMA(&huart4,"HELLO",5);
    }
}

定时器中断函数

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    
    if(htim->Instance == TIM3)    //10ms           
    {
        if(++LaserSendCount > LaserSendInterval)    //发送
        {
            LaserSendCount = 0;
            LaserTxFlag = 1;    
        }
        
    }
}

主函数

int main(void)
{

  /* USER CODE BEGIN 1 */
    
  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_TIM3_Init();
  MX_USART4_UART_Init();
  
  
  
  /* USER CODE BEGIN 2 */
  
  
  
  HAL_TIM_Base_Start_IT(&htim3);    
  

  
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    Laser_Rate(5);    //在主函数中调用，1s发送五次

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}