[BUG] USB_FLASH_DRIVE_SUPPORT causes compilation error for STM32F401CC/STM32F411CE MCUs

Did you test the latest `bugfix-2.1.x` code?

Yes, and the problem still exists.

Bug Description

Unlike their more expensive STM32F407 cousins, the STM32F4x1Cx MCUs do not have a luxury of secondary USB controller.

USB_FLASH_DRIVE_SUPPORT on STM32 requires custom framework-arduinoststm32 https://github.com/rhapsodyv/Arduino_Core_STM32/archive/usb-host-msc-cdc-msc-3.zip USB Host initialization function expects both USB_OTG_FS (Full Speed) and USB_OTG_HS (High Speed) to be defined at compilation time. STM32F401CC MCU only has USB_OTG_FS which leads to compilation errors due to undefined USB_OTG_HS macro.

USBH_LL_Init() function should be updated to exclude HOST_HS code when USB_OTG_HS is not defined. https://github.com/rhapsodyv/Arduino_Core_STM32/blob/usb-host-msc-cdc-msc-3/cores/arduino/stm32/usb_host/usbh_conf.c#L237

Here is the corrected code where the #ifdef USB_OTG_HS check is used to block unused section of the code. @rhapsodyv, please apply this fix to usb-host-msc-cdc-msc-3 branch.

USBH_StatusTypeDef USBH_LL_Init(USBH_HandleTypeDef *phost)
{
  /* Init USB_IP */
  if (phost->id == HOST_FS) {
    /* Link the driver to the stack. */
    g_hhcd.pData = phost;
    phost->pData = &g_hhcd;

    g_hhcd.Instance = USB_OTG_FS;
    g_hhcd.Init.Host_channels = 8;
    g_hhcd.Init.speed = HCD_SPEED_FULL;
    g_hhcd.Init.dma_enable = DISABLE;
    g_hhcd.Init.phy_itface = HCD_PHY_EMBEDDED;
    g_hhcd.Init.Sof_enable = DISABLE;
    if (HAL_HCD_Init(&g_hhcd) != HAL_OK) {
      // Error_Handler( );
      return USBH_FAIL;
    }

    USBH_LL_SetTimer(phost, HAL_HCD_GetCurrentFrame(&g_hhcd));
  }
#ifdef USB_OTG_HS
  else if (phost->id == HOST_HS) {
    /* Link the driver to the stack. */
    g_hhcd.pData = phost;
    phost->pData = &g_hhcd;

    g_hhcd.Instance = USB_OTG_HS;
    g_hhcd.Init.Host_channels = 12;
    g_hhcd.Init.speed = HCD_SPEED_FULL;
    g_hhcd.Init.dma_enable = DISABLE;
#ifdef USE_USB_HS_IN_FS
    g_hhcd.Init.phy_itface = USB_OTG_EMBEDDED_PHY;
#else
    g_hhcd.Init.phy_itface = USB_OTG_ULPI_PHY;
#endif
    g_hhcd.Init.Sof_enable = DISABLE;
    g_hhcd.Init.low_power_enable = DISABLE;
    g_hhcd.Init.vbus_sensing_enable = DISABLE;
    g_hhcd.Init.use_external_vbus = DISABLE;

    if (HAL_HCD_Init(&g_hhcd) != HAL_OK) {
      Error_Handler();
    }

    USBH_LL_SetTimer(phost, HAL_HCD_GetCurrentFrame(&g_hhcd));
  }
#endif // USB_OTG_HS
  return USBH_OK;
}

Expected behavior

Marlin can be compiled for STM32F401CC with USB_FLASH_DRIVE_SUPPORT and USE_OTG_USB_HOST options enabled.

Actual behavior

Enabling USB_FLASH_DRIVE_SUPPORT and USE_OTG_USB_HOST causes compilation errors.

Version of Marlin Firmware

bugfix-2.1.x

Electronics

STM32F401CCU6 and STM32F411CEU6 boards a.k.a black pill

MarlinFirmware / Marlin