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