写一个基于stm32HAL库检测1MHZ频率的方波

以下是使用STM32 HAL库检测1MHz方波频率的示例代码：

#include "main.h"
#include "stm32f1xx_hal.h"

/* 配置TIM2 */
void MX_TIM2_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = (SystemCoreClock / 1000000) - 1;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 0xFFFFFFFF;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

int main(void)
{
  HAL_Init();
  MX_TIM2_Init();
  HAL_TIM_Base_Start(&htim2);

  /* 计算捕获寄存器的最大值 */
  uint32_t maxCapture = 0xFFFFFFFF / HAL_RCC_GetHCLKFreq(); 

  while (1)
  {
    /* 捕获捕获计数器的值 */
    uint32_t capture = __HAL_TIM_GET_COUNTER(&htim2);
    /* 如果计数器溢出，则重置计数器 */
    if (capture > maxCapture)
      __HAL_TIM_SET_COUNTER(&htim2, 0);

    /* 延迟1秒 */
    HAL_Delay(1000);

    /* 计算方波频率 */
    uint32_t frequency = capture * HAL_RCC_GetHCLKFreq();
    printf("Frequency: %lu Hz\n", frequency);
  }
}

请注意，这只是演示如何使用STM32 HAL库检测1MHz方波频率的示例代码。您需要根据自己的具体硬件和使用情况进行适当的修改。