SYS_delayMicrosecond.c

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/*****************************************************************************
                           C   M O D U L E   F I L E

    Copyright (c) 2003 Neuros Audio LLC, All rights reserved.

******************************************************************************/


/*-- HEADER FILE INCLUDES ---------------------------------------------------*/
#include "sys_delay.h"
#include "sys_clock.h"

/*-- LOCAL DEFINITIONS -------------------------------------------------------*/

/*-- STATIC DATA -------------------------------------------------------------*/

/*-- GLOBAL DATA -------------------------------------------------------------*/

/*-- FUNCTIONS ---------------------------------------------------------------*/
#pragma CODE_SECTION(SYS_delayMicrosecond, ".sram0_resident")
void SYS_delayMicrosecond(long lDuration)
{
    long Delay; 
    
    UINT32 CPU_clock = SYS_getCPUClock();

    UINT16 CurrentPeriod, OldPeriod, TDDR;
    
    OldPeriod = TIM;        
        
    TDDR = TCR & 0x0f;      

    Delay = ((CPU_clock / 16384) / (TDDR + 1) * lDuration) / (1000000/16384);
    
    while (Delay > 0)
    {
        CurrentPeriod = TIM;
        
        if (OldPeriod < CurrentPeriod){
        
            Delay -= (OldPeriod + ( PRD - CurrentPeriod));
        }
        else {
        
            Delay -= (OldPeriod - CurrentPeriod);
        }
        
        OldPeriod = CurrentPeriod;
    }
}

/*****************************************************************************
                Neuros Audio LLC. Confidential Proprietary
 *****************************************************************************/

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