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diff --git a/nuttx/configs/px4fmu-v1/src/up_usb.c b/nuttx/configs/px4fmu-v1/src/up_usb.c
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+/************************************************************************************
+ * configs/stm32f4discovery/src/up_usbdev.c
+ * arch/arm/src/board/up_boot.c
+ *
+ * Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <sched.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/usb/usbdev.h>
+#include <nuttx/usb/usbhost.h>
+#include <nuttx/usb/usbdev_trace.h>
+
+#include "up_arch.h"
+#include "stm32.h"
+#include "px4fmu-v1-internal.h"
+
+#ifdef CONFIG_STM32_OTGFS
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+#if defined(CONFIG_USBDEV)
+# define HAVE_USB 1
+#else
+# warning "CONFIG_STM32_OTGFS is enabled but not CONFIG_USBDEV"
+# undef HAVE_USB
+#endif
+
+/************************************************************************************
+ * Private Data
+ ************************************************************************************/
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_usbinitialize
+ *
+ * Description:
+ * Called from stm32_usbinitialize very early in inialization to setup USB-related
+ * GPIO pins for the STM32F4Discovery board.
+ *
+ ************************************************************************************/
+
+void stm32_usbinitialize(void)
+{
+ /* The OTG FS has an internal soft pull-up. No GPIO configuration is required */
+
+ /* Configure the OTG FS VBUS sensing GPIO, Power On, and Overcurrent GPIOs */
+
+#ifdef CONFIG_STM32_OTGFS
+ stm32_configgpio(GPIO_OTGFS_VBUS);
+#endif
+}
+
+/************************************************************************************
+ * Name: stm32_usbsuspend
+ *
+ * Description:
+ * Board logic must provide the stm32_usbsuspend logic if the USBDEV driver is
+ * used. This function is called whenever the USB enters or leaves suspend mode.
+ * This is an opportunity for the board logic to shutdown clocks, power, etc.
+ * while the USB is suspended.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_USBDEV
+void stm32_usbsuspend(FAR struct usbdev_s *dev, bool resume)
+{
+ ulldbg("resume: %d\n", resume);
+}
+#endif
+
+#endif /* CONFIG_STM32_OTGFS */
+
+
+