STM32H7 SDMMC1初始化阶段无响应问题排查求助

问题现象 #

• KEIL调试模式下，SDMMC1寄存器无任何位切换，完全无响应
• 示波器未检测到MMC初始化相关信号，时钟、CMD及数据线均无波动
• 此前通过软SDIO实现过功能，但切换到硬件SDMMC1后，无论是HAL驱动还是直接寄存器操作都没有反应

代码片段 #

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SDMMC1_MMC_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_USB_DEVICE_Init();
  
  while (1)
  {
    if (UserRxBufferFS[0] == 0x97)   // 收到eMMC触发命令
     {  
      UserRxBufferFS[0] = 0;
      SDMMC1->POWER = 1; // 调试时发现该寄存器无变化，原因未知？
      MX_SDMMC1_MMC_Init();
      SDMMC_PowerState_ON(&hmmc2); // 用HAL操作电源寄存器也无变化
      SDMMC_SendCommand(&hmmc2, 0); // 示波器观测CMD线无任何动作
      }
  }
}

static void MX_SDMMC1_MMC_Init(void)
{
  hmmc1.Instance = SDMMC1;
  hmmc1.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
  hmmc1.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
  hmmc1.Init.BusWide = SDMMC_BUS_WIDE_1B;
  hmmc1.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_DISABLE;
  hmmc1.Init.ClockDiv = 0;
}

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

  /** 电源配置更新使能
  */
  HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

  /** 配置主内部稳压器输出电压
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}

  /** 根据指定参数初始化RCC振荡器
  */
  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 = 1;
  RCC_OscInitStruct.PLL.PLLN = 80;
  RCC_OscInitStruct.PLL.PLLP = 2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  RCC_OscInitStruct.PLL.PLLR = 2;
  RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_3;
  RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
  RCC_OscInitStruct.PLL.PLLFRACN = 0;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** 初始化CPU、AHB和APB总线时钟
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
                              |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;
  RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

更新信息 #

• RCC配置如图所示（注：原图未提供）
• stm32h7xx_hal_rcc.h中的__HAL_RCC_C1_SDMMC1_CLK_ENABLE()未激活

内容的提问来源于stack exchange，提问作者KlimDuda