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/*
* File : clock.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
*/
#include <rtthread.h>
#include "gk7101.h"
#include "board.h"
/**
* @brief System Clock Configuration
*/
void rt_hw_clock_init(void)
{
}
void rt_hw_us_delay(rt_uint32_t us)
{
rt_uint32_t start_time = 0;
rt_uint32_t end_time = 0;
int time_difference = 0;
start_time = gkosGetTicks();
do
{
end_time = gkosGetTicks();
time_difference = (rt_uint32_t)(end_time - start_time);
/* check overflow */
if(start_time > end_time)
{
time_difference = ((time_difference < 0L) ? -time_difference : time_difference); /* C-LIB code for labs() */
}
}while(time_difference < (us/1000));
}
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