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