NUCLEO-H743ZI USB HOST MSC not firing the HOST_USER_CLASS_ACTIVE event

[NRobb]

Hi

I have been trying to get USB HOST MSC working on the NUCLEO-H743ZI and cannot get past one point. I have reduced my test to a new test project with auto-generated code via STm32CubeIDE with the following settings.

• FATFS enabled for USB only with USBH instance = "USBH Host MSC FS" and VOLUMES increased to 2
• USB_HOST set to FS Mass Storage Host Class only and VBUS driven by GPIO
• USB_OTG_FS in Host_Only mode with VBUS sensing on and SOF activated (although I tried these off as well.
• USB Clock confirmed as 48Mhz

The auto-generated code gives me the basics, and I have added a VBUS enable after initialising everything, and I can see the LED light as well as measure 5V on the USB power lines.

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ETH_Init();
  MX_USART3_UART_Init();
  MX_FATFS_Init();
  MX_USB_HOST_Init();
  /* USER CODE BEGIN 2 */
 
  MX_DriverVbusFS(0); // Turn on USB power
 
  /* USER CODE END 2 */

With that as the basics, I can see that the USBH_UserProcess is called with HOST_USER_CONNECTION and HOST_USER_DISCONNECTION whenever I plug the USB stick on or remove it. So, I know the USB is up and running.

The initialisation does not throw any errors... (again auto-generated so I am trusting it is correct)

void MX_USB_HOST_Init(void)
{
  /* USER CODE BEGIN USB_HOST_Init_PreTreatment */
  
  /* USER CODE END USB_HOST_Init_PreTreatment */
  
  /* Init host Library, add supported class and start the library. */
  if (USBH_Init(&hUsbHostFS, USBH_UserProcess, HOST_FS) != USBH_OK)
  {
    Error_Handler();
  }
  if (USBH_RegisterClass(&hUsbHostFS, USBH_MSC_CLASS) != USBH_OK)
  {
    Error_Handler();
  }
  if (USBH_Start(&hUsbHostFS) != USBH_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USB_HOST_Init_PostTreatment */
  
  HAL_PWREx_EnableUSBVoltageDetector();
 
  /* USER CODE END USB_HOST_Init_PostTreatment */
}

I added the HAL_PWREx_EnableUSBVoltageDetector as a result of other internet threads, but it did not fix anything, and I suspect it is for Slave mode and not Host mode,

As MSC class is registered, I was expecting that the standard auto-generated USBH_UserProcess  would trigger the HOST_USER_CLASS_ACTIVE event as well, but that never gets fired.

So, I added FATS_LinkDriver (which worked) and an f_mount (which fails) and still cannot get the MSC driver to start up and fire the HOST_USER_CLASS_ACTIVE.

static void USBH_UserProcess  (USBH_HandleTypeDef *phost, uint8_t id)
{
  /* USER CODE BEGIN CALL_BACK_1 */
  switch(id)
  {
  case HOST_USER_SELECT_CONFIGURATION:
  break;
 
  case HOST_USER_DISCONNECTION:
  Appli_state = APPLICATION_DISCONNECT;
  if (f_mount(NULL, "", 0) != FR_OK)
  {
	  Error_Handler();
  }
  if (FATFS_UnLinkDriver(USBDISKPath) != 0)
  {
	  Error_Handler();
  }
  break;
 
  case HOST_USER_CLASS_ACTIVE:
  Appli_state = APPLICATION_READY;
  break;
 
  case HOST_USER_CONNECTION:
  Appli_state = APPLICATION_START;
  if (FATFS_LinkDriver(&USBH_Driver, USBDISKPath) == 0)
  {
    if (f_mount(&USBH_fatfs, USBDISKPath, 1) != FR_OK)
    {
    	HAL_Delay(1);
    }
    else
    {
    	HAL_Delay(1);
    }
 
  break;
 
  default:
  break;
  }

As the VBUS is working, and the USB connect/disconnect events are firing, I assume I am missing some step out, but I can't find any hints in the application notes or forums. I have tried adapting the H743 EVAL board example to the NUCLEO board, but that seems to get me to the same point.

Is there a native USB MSC example for the NUCLEO-743ZI, or is there an obvious step or set-up that I may be missing?

Thanks in advance for any pointers,

Nick

[Pedro3 · Accepted solution]

Are you using STM32CubeMX 5.2.1 and HAL 1.4.0? Please, try to add the following callbacks in "usbh_conf.c":

/**
  * @brief  Port Port Enabled callback.
  * @param  hhcd: HCD handle
  * @retval None
  */
void HAL_HCD_PortEnabled_Callback(HCD_HandleTypeDef *hhcd)
{
  USBH_LL_PortEnabled(hhcd->pData);
}
/**
  * @brief  Port Port Disabled callback.
  * @param  hhcd: HCD handle
  * @retval None
  */
void HAL_HCD_PortDisabled_Callback(HCD_HandleTypeDef *hhcd)
{
  USBH_LL_PortDisabled(hhcd->pData);
}

The "HAL_PWREx_EnableUSBVoltageDetector()" function is now added by Cube in "main.c". I'm having some issues porting from HAL 1.3.2 to HAL 1.4.0...

[NRobb]

Hi Peaga,

Thanks for the reply. I am running STM32CubeIDE with CubeMX 5.2.1 and HAL driver 1.5.0.

I added in those callbacks, and it is now working 🙂 I can now mount and read the USB label, and I see it go through the intermediate states as well.

Many thanks for the pointer 🙂

May I ask if this is something that would be expected to be included in the auto-generated code (as they seem to be adding code to catch the output of it), or have I missed a key section in the application notes somewhere?

Thanks again

Nick

[ns.moskalev]

Hello. I have the same question. Why port connection function "USBH_LL_PortEnabled (hhcd-> pData);" should be called via callback?

Please tell me an alternative way in which a different outcome is possible?