mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-11 22:24:13 +01:00
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
/*
|
|
%atmel_license%
|
|
*/
|
|
|
|
/**
|
|
* \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 ) ;
|
|
}
|
|
|