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119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/* ----------------------------------------------------------------------------
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* SAM Software Package License
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* ----------------------------------------------------------------------------
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* Copyright (c) 2011, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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/**
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* \file
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* Implement simple system tick usage.
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*/
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "chip.h"
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/*----------------------------------------------------------------------------
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* Local variables
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*----------------------------------------------------------------------------*/
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/** Tick Counter united by ms */
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static volatile uint32_t _dwTickCount=0 ;
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/*----------------------------------------------------------------------------
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* Exported Functions
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*----------------------------------------------------------------------------*/
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/**
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* \brief Handler for Sytem Tick interrupt.
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*/
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extern void TimeTick_Increment( void )
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{
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_dwTickCount++ ;
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}
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/**
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* \brief Configures the SAM3 SysTick & reset tickCount.
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* Systick interrupt handler will generates 1ms interrupt and increase a
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* tickCount.
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* \param dwNew_MCK Current master clock.
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*/
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extern uint32_t TimeTick_Configure( uint32_t dwNew_MCK )
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{
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_dwTickCount = 0 ;
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return SysTick_Config( dwNew_MCK/1000 ) ;
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}
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/**
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* \brief Get current Tick Count, in ms.
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*/
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extern uint32_t GetTickCount( void )
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{
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return _dwTickCount ;
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}
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/**
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* \brief Sync Wait for several ms
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*/
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extern void Wait( volatile uint32_t dwMs )
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{
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uint32_t dwStart ;
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uint32_t dwCurrent ;
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dwStart = _dwTickCount ;
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do
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{
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dwCurrent = _dwTickCount ;
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} while ( dwCurrent - dwStart < dwMs ) ;
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}
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/**
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* \brief Sync Sleep for several ms
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*/
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extern void Sleep( volatile uint32_t dwMs )
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{
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uint32_t dwStart ;
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uint32_t dwCurrent ;
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dwStart = _dwTickCount ;
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do
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{
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dwCurrent = _dwTickCount ;
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if ( dwCurrent - dwStart > dwMs )
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{
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break ;
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}
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__WFI() ;
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} while( 1 ) ;
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}
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