[USB] Fix H7 issue of missing VDD33USB

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

cores/arduino/stm32/usb/usbd_conf.c

@@ -19,6 +19,7 @@
 #ifdef USBCON
 /* Includes ------------------------------------------------------------------*/
 #include "usbd_core.h"
+#include "stm32yyxx_ll_pwr.h"
 
 #ifndef HAL_PCD_MODULE_ENABLED
 #error "HAL_PCD_MODULE_ENABLED is required"
@@ -52,6 +53,11 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd)
     HAL_PWREx_EnableVddUSB();
   }
 #endif
+#ifdef STM32H7xx
+  if(!LL_PWR_IsActiveFlag_USB()) {
+    HAL_PWREx_EnableUSBVoltageDetector();
+  }
+#endif
 #if defined (USB)
   if(hpcd->Instance == USB) {