nuttx-apps/graphics/lvgl/lv_tick_interface.c

/****************************************************************************
 * apps/graphics/lvgl/lv_tick_interface.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 <stdio.h>
#include "lv_tick_interface.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Type Declarations
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

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

uint32_t lv_tick_interface(void)
{
  static bool first_time = true;
  static struct timeval t0;

  if (first_time)
    {
      gettimeofday(&t0, NULL);
      first_time = false;
      return 0;
    }
  else
    {
      struct timeval t;
      struct timeval delta;

      gettimeofday(&t, NULL);
      timersub(&t, &t0, &delta);
      return delta.tv_sec * 1000 + delta.tv_usec / 1000;
    }
}