帮我写一份hcsr04超声波模块的stm32代码

好的，这里是一个简单的HCSR04超声波模块的STM32代码，使用HAL库和TIM2定时器：

#include "stm32f4xx.h"
#include "stm32f4xx_hal.h"

#define TRIGGER_PIN GPIO_PIN_0
#define ECHO_PIN GPIO_PIN_1
#define TRIGGER_PORT GPIOA
#define ECHO_PORT GPIOA

TIM_HandleTypeDef htim2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_TIM2_Init();

  while (1)
  {
    // 发送10us的脉冲
    HAL_GPIO_WritePin(TRIGGER_PORT, TRIGGER_PIN, GPIO_PIN_SET);
    HAL_Delay(10);
    HAL_GPIO_WritePin(TRIGGER_PORT, TRIGGER_PIN, GPIO_PIN_RESET);

    // 等待回声信号
    while (!HAL_GPIO_ReadPin(ECHO_PORT, ECHO_PIN));

    // 开始计时
    HAL_TIM_Base_Start(&htim2);

    // 等待回声信号结束
    while (HAL_GPIO_ReadPin(ECHO_PORT, ECHO_PIN));

    // 停止计时
    uint32_t time = HAL_TIM_Base_Stop(&htim2);

    // 计算距离
    float distance = time * 0.0343 / 2;

    // TODO: 处理距离数据
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_TIM2_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 83;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 0xFFFFFFFF;
  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();
  }
}

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(TRIGGER_PORT, TRIGGER_PIN, GPIO_PIN_RESET);

  /*Configure GPIO pin : ECHO_PIN */
  GPIO_InitStruct.Pin = ECHO_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(ECHO_PORT, &GPIO_InitStruct);

  /*Configure GPIO pin : TRIGGER_PIN */
  GPIO_InitStruct.Pin = TRIGGER_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(TRIGGER_PORT, &GPIO_InitStruct);
}

这个代码通过TIM2定时器来计算回声信号的时间，然后根据声速计算距离。你可以在计算距离的部分添加你想要的处理逻辑。记得在CubeMX中配置你的GPIO和TIM2定时器。