text: /****************************************************************************
   * boards/arm/sam34/sam4s-xplained-pro/src/sam_udp.c
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.  The
   * ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the
   * License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <sys/types.h>
  #include <stdint.h>
  #include <stdbool.h>
  #include <debug.h>
  
  #include <nuttx/usb/usbdev.h>
  #include <nuttx/usb/usbdev_trace.h>
  
  #include "arm_arch.h"
  #include "sam4s-xplained-pro.h"
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name:  sam_udp_suspend
   *
   * Description:
   *   Board logic must provide the sam_udp_suspend logic if the UDP driver is
   *   used.
   *   This function is called whenever the USB enters or leaves suspend mode.
   *
   *   When 'resume' is false, this function call provides an opportunity to
   *   perform board-specific power-saving actions so that less power is
   *   consumed while the USB is suspended.
   *
   *   Certain power-saving operations are performed by the UDP driver when
   *   it enters suspend mode:
   *   The USB device peripheral clocks are be switched off.  MCK and
   *   UDPCK are switched off and the USB transceiver is disabled.
   *
   *   When 'resume' is true, normal clocking and operations must all be
   *   restored.
   *
   ****************************************************************************/
  
  void sam_udp_suspend(FAR struct usbdev_s *dev, bool resume)
  {
    uinfo("resume: %d\n", resume);
  }
  