incubator-nuttx/net/utils/net_dsec2tick.c

/****************************************************************************
 * net/utils/net_dsec2tick.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 <nuttx/clock.h>

#include "utils/utils.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: net_dsec2tick
 *
 * Description:
 *   Convert a decisecond value to a system clock ticks.  Used by IGMP logic.
 *
 * Input Parameters:
 *   dsec The decisecond value to convert
 *
 * Returned Value:
 *   The decisecond value expressed as system clock ticks
 *
 ****************************************************************************/

unsigned int net_dsec2tick(int dsec)
{
  /* Convert the deci-second comparison value to clock ticks.  The CLK_TCK
   * value is the number of clock ticks per second; decisecs argument is the
   * maximum delay in 100's of milliseconds.  CLK_TCK/10 is then the number
   * of clock ticks in 100 milliseconds.
   */

  return CLK_TCK * dsec / 10;
}