diff --git a/targets/TARGET_STM/USBPhy_STM32.cpp b/targets/TARGET_STM/USBPhy_STM32.cpp
index 333cf7883e..7a1dc23c54 100644
--- a/targets/TARGET_STM/USBPhy_STM32.cpp
+++ b/targets/TARGET_STM/USBPhy_STM32.cpp
@@ -173,6 +173,15 @@ USBPhyHw::~USBPhyHw()
 
 }
 
+#if defined(TARGET_STM32F1)
+void USB_reenumerate()
+{
+    // Force USB_DP pin (with external pull up) to 0
+    DigitalOut usb_dp_pin(USB_DP, 0) ;
+    wait_us(10000); // 10ms
+}
+#endif
+
 void USBPhyHw::init(USBPhyEvents *events)
 {
     const PinMap *map = NULL;
@@ -190,10 +199,12 @@ void USBPhyHw::init(USBPhyEvents *events)
     hpcd.Init.dev_endpoints = NB_ENDPOINT;
     hpcd.Init.ep0_mps = MAX_PACKET_SIZE_EP0;
     hpcd.Init.low_power_enable = DISABLE;
+
 #if !defined(TARGET_STM32F2)
     hpcd.Init.lpm_enable = DISABLE;
     hpcd.Init.battery_charging_enable = DISABLE;
 #endif
+
 #if (MBED_CONF_TARGET_USB_SPEED == USE_USB_OTG_HS)
     hpcd.Instance = USB_OTG_HS;
     hpcd.Init.phy_itface = PCD_PHY_ULPI;
@@ -202,22 +213,32 @@ void USBPhyHw::init(USBPhyEvents *events)
     hpcd.Init.vbus_sensing_enable = ENABLE;
     hpcd.Init.use_external_vbus = DISABLE;
     hpcd.Init.speed = PCD_SPEED_HIGH;
+
     __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
     __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
     map = PinMap_USB_HS;
-#elif (MBED_CONF_TARGET_USB_SPEED == USE_USB_OTG_HS)
-    hpcd.Instance = USB_OTG_HS;
-    hpcd.Init.phy_itface = PCD_PHY_EMBEDDED;
-    hpcd.Init.Sof_enable = 1;
-    hpcd.Init.speed = PCD_SPEED_HIGH;
-#elif (MBED_CONF_TARGET_USB_SPEED == USE_USB_OTG_FS)
 
+#elif (MBED_CONF_TARGET_USB_SPEED == USE_USB_HS_IN_FS)
+    hpcd.Instance = USB_OTG_HS;
+    hpcd.Init.phy_itface = USB_OTG_EMBEDDED_PHY;
+    hpcd.Init.Sof_enable = ENABLE;
+    hpcd.Init.speed = PCD_SPEED_FULL;
+    hpcd.Init.dma_enable = DISABLE;
+    hpcd.Init.vbus_sensing_enable = DISABLE;
+    hpcd.Init.use_external_vbus = DISABLE;
+
+    __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
+    map = PinMap_USB_HS;
+
+#elif (MBED_CONF_TARGET_USB_SPEED == USE_USB_OTG_FS)
     hpcd.Instance = USB_OTG_FS;
     hpcd.Init.phy_itface = PCD_PHY_EMBEDDED;
     hpcd.Init.Sof_enable = 1;
     hpcd.Init.speed = PCD_SPEED_FULL;
+
     __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
     map = PinMap_USB_FS;
+
 #elif (MBED_CONF_TARGET_USB_SPEED == USE_USB_NO_OTG)
     hpcd.Instance = USB;
     hpcd.Init.phy_itface = PCD_PHY_EMBEDDED;
@@ -225,13 +246,18 @@ void USBPhyHw::init(USBPhyEvents *events)
 
     __HAL_RCC_USB_CLK_ENABLE();
     map = PinMap_USB_FS;
+
+#if defined(TARGET_STM32F1)
+    // USB_DevConnect is empty
+    USB_reenumerate();
+#endif
+
 #endif
 
     // Pass instance for usage inside call back
     instance = this;
 
-    // Configure USB pins and other clocks
-
+    // Configure USB pins
     while (map->pin != NC) {
         pin_function(map->pin, map->function);
         map++;
@@ -334,25 +360,29 @@ bool USBPhyHw::powered()
 void USBPhyHw::connect()
 {
 #if (MBED_CONF_TARGET_USB_SPEED == USE_USB_NO_OTG)
-    DigitalOut usb_disc_pin(USB_DP, 1) ;
-    wait_ns(1000);
-    usb_disc_pin = 0;
+    // Initializes the USB controller registers
+    USB_DevInit(hpcd.Instance, hpcd.Init); // hpcd.Init not used
+
+#if defined(TARGET_STM32F1)
+    // USB_DevConnect is empty
+    USB_reenumerate();
+#endif
+
+#endif
 
-    uint32_t wInterrupt_Mask = USB_CNTR_CTRM | USB_CNTR_WKUPM | USB_CNTR_SUSPM | USB_CNTR_ERRM |
-                               USB_CNTR_SOFM | USB_CNTR_ESOFM | USB_CNTR_RESETM;
-    /*Set interrupt mask*/
-    hpcd.Instance->CNTR = wInterrupt_Mask;
-    HAL_PCD_DevConnect(&hpcd); // HAL_PCD_DevConnect always return HAL_OK
-    wait_us(10000);
-#else
     HAL_StatusTypeDef ret = HAL_PCD_Start(&hpcd);
     MBED_ASSERT(ret == HAL_OK);
-#endif
+
+    wait_us(10000);
 }
 
 void USBPhyHw::disconnect()
 {
-    HAL_StatusTypeDef ret = HAL_PCD_Stop(&hpcd);
+    /* Disable DP Pull-Up bit to disconnect the Internal PU resistor on USB DP line */
+    USB_DevDisconnect(hpcd.Instance);
+    wait_us(10000);
+
+    HAL_StatusTypeDef ret = HAL_PCD_Stop(&hpcd); // USB_DisableGlobalInt + USB_StopDevice
     MBED_ASSERT(ret == HAL_OK);
 }