timestamp.c

ge公司的dv4av4信号处理板的bsp源代码

/***************************************************************************
*
*  $RCSfile: timeStamp.c $
*
*  Copyright 2002 by Dy 4 Systems, Inc.  All Rights Reserved.
*
*  $Revision: 1.5 $
*
*  $Name: AV4-ISP-R1.2-1 AV4-ISP-R1.2-0 HMTST2 HMTST1 DVT_AV4_4.101 AV4-VSP-R1.0-2 AV4-VSP-R1.0 CT-ISP-1.1 AV4 ISP 1.1 CT_R0.1_AV4/CAV4 champtools2.22 CAV4_CP1 CHAMPtools FW 3.0 champtools2.21_1215 champtools2.21 champ221_build1 champtools2.2 CHAMPtools_2.1.1_AV3 CHAMPtools_2.1_106 CHAMPtools_2.0_AV3 $  $State: Developmental $  $Locker: $
*
*  $Source: L:/SWRND/champAV2/src/vx/src/drv/timer/rcs/timeStamp.c $
*
*  RCS Project Name:
*
*  CSC:
*
*  Target:
*
*  Description:
*
*  Usage:
*
*  $Log: timeStamp.c $
*  Revision 1.5  2003/08/05 20:04:36Z  esaunder
*  Modified to utilize AV3 timer resource allocation functions (bslTimerAlloc,
*  bslTimerDealloc); timer allocated only while enabled.
*  Revision 1.4  2002/07/27 11:32:07  coopertr
*  The get frequency function now returns the timer's input frequency,
*  per WRS specifications for a timestamp driver.
*  Revision 1.3  2002/05/28 14:40:14  coopertr
*  Revision 1.2  2002/05/24 22:00:34  coopertr
*  Revision 1.1  2002/05/08 16:04:52  coopertr
*  Initial revision
*
****************************************************************************/

/* Copyright 1994 Wind River Systems, Inc. */ 
#include "copyright_wrs.h" 
 
/* 
modification history 
-------------------- 
01a,23mar94,dzb  written. 
*/ 
 
/* 
DESCRIPTION 
This library contains timestamp driver management routines using
one of the Galileo timers for the timestamp driver.
 
To include the timestamp timer facility, the macro INCLUDE_TIMESTAMP must be 
defined.

*/ 
 
#ifdef  INCLUDE_TIMESTAMP 
 
#include "drv/timer/timestampDev.h" 
#include "bsl.h"
#include "bslInt.h"


/* Locals */  
 
LOCAL BOOL      sysTimestampRunning = FALSE;      /* running flag   */
LOCAL long      timestampTicks=0;                 /* ticks/interval */
LOCAL long      timestampFreq=0;                  /* input freq     */
LOCAL long      timestampIntRate = 1;             /* interrupts/sec */

char	        sysTimestampTimerName[] = "Timestamp Timer";
int	        sysTimestampTimerID     = -1;
unsigned short  initialized=0;

void   timeStampNull (void)
{
}

 
/*************************************************************************** 
* 
* sysTimestampConnect - connect a user routine to timestamp timer interrupt 
* 
* This routine connects the timestamp timer interrupt, enables the
* interrupt, and initializes the counter registers (rate).
* This routine specifies the user interrupt routine to be called at each 
* timestamp timer interrupt.  It does not enable the timestamp timer itself. 
* Called from .../vx/proj/..../prjConfig.c
*
* If the timer already exists, the existing one is used.
* 
* RETURNS: OK, or ERROR if sysTimestampInt() interrupt handler is not used. 
*/ 
  
STATUS sysTimestampConnect 
    ( 
    FUNCPTR routine,    /* routine called at each timestamp timer interrupt */ 
    int arg             /* argument with which to call routine */ 
    ) 
{
    STATUS status = OK;

    if( bslTimerAlloc( sysTimestampTimerName, NON_EXCL, &sysTimestampTimerID ) != BSL_ERROR_NONE )
    {
        sysTimestampTimerID  =  -1;
	status  =  ERROR;
    }
    else
    {
       bslTimerStop (sysTimestampTimerID);
	   
       intConnect ((void *)bslTimerToId (sysTimestampTimerID),
                   (void *)routine, arg);
      
       timestampFreq  = bslBoardGetBusSpeed ();
       timestampTicks = timestampFreq/timestampIntRate;
       bslTimerSetTicks (sysTimestampTimerID, timestampTicks);
       bslTimerIntEnable (sysTimestampTimerID);
       initialized  =  1;
   }
   return( status );
} 
 
/*************************************************************************** 
* 
* sysTimestampEnable - enable the timestamp timer 
* 
* If the timestamp timer is already running, this routine 
* merely resets the timer counter. 
* 
* This routine does not initialize the timer clock rate. 
* 
* RETURNS: OK, or ERROR if the timestamp timer cannot be enabled. 
*/


 
STATUS sysTimestampEnable (void) 
{ 
    STATUS status = OK;

    if( !initialized ) status  =  ERROR;
    else
    {
        /**  Note: NON_EXCL option tolerates multiple calls to sysTimestampEnable() w/o an
             intervening sysTimestampDisable()  **/

        if( bslTimerAlloc( sysTimestampTimerName, NON_EXCL, &sysTimestampTimerID ) != BSL_ERROR_NONE )
        {
	    status  =  ERROR;
        }
        else
        {
            sysTimestampRunning  =  TRUE; 
            bslTimerStart( sysTimestampTimerID );
        }
    }
    return( status );
}
 
/*************************************************************************** 
* sysTimestampDisable - disable the timestamp timer 
* 
* This routine disables the timestamp timer & deallocates the timer
* resource.  Interrupts are not disabled; however, the tick counter does 
* not increment after the timestamp timer is disabled, ensuring that 
* interrupts are no longer generated. 
* 
* RETURNS: OK, or ERROR if the timestamp timer cannot be disabled. 
*/ 
  
STATUS sysTimestampDisable (void) 
{ 
    STATUS status = OK;

    if( sysTimestampTimerID == -1 ) status  =  ERROR;
    else
    {
       sysTimestampRunning = FALSE; 
       bslTimerStop (sysTimestampTimerID);
       bslTimerDealloc( sysTimestampTimerName );
       sysTimestampTimerID  =  -1;
    }
    return( status ); 
} 
 
/*************************************************************************** 
* 
* sysTimestampPeriod - get the timestamp timer period 
* 
* This routine returns the period of the timer in timestamp ticks. 
* The period, or terminal count, is the number of ticks to which the 
* timestamp timer counts before rolling over and restarting the counting 
* process. 
* 
* RETURNS: The period of the timer in timestamp ticks. 
*/ 
  
UINT32 sysTimestampPeriod (void) 
    { 
    /* return the system clock period in timestamp ticks */ 
 
    return (timestampTicks);
    } 
 
/*************************************************************************** 
* 
* sysTimestampFreq - get the timestamp timer clock frequency 
* 
* This routine returns the frequency into the timer clock, in Hz. 
* 
* RETURNS: The timestamp timer clock input frequency, in Hz. 
*/ 
  
UINT32 sysTimestampFreq (void) 
	{ 
	return (timestampFreq); 
	} 
 
/*************************************************************************** 
* 
* sysTimestamp - get the timestamp timer tick count 
* 
* This routine returns the current value of the timestamp timer tick counter.
* Because the counter counts from timestampTicks down to zero, we
* return timestampTicks minus the register value to get the number
* of ticks elapsed since the last timestamp driver interrupt.
* 
* RETURNS: The current timestamp timer tick count. 
* SEE ALSO: sysTimestampLock() 
*/ 
  
UINT32 sysTimestamp (void) 
    { 
    if( sysTimestampTimerID == -1 ) return 0;
    else
        return (timestampTicks - bslTimerRead (sysTimestampTimerID));
    } 
 
/*************************************************************************** 
* 
* sysTimestampLock - get the timestamp timer tick count 
* 
* This routine returns the current value of the timestamp timer tick counter. 
* The tick count can be converted to seconds by dividing by the return of 
* sysTimestampFreq(). 
* 
* RETURNS: The current timestamp timer tick count. 
* 
* SEE ALSO: sysTimestamp() 
*/ 
  
UINT32 sysTimestampLock (void) 
    { 
    return (sysTimestamp ());
    } 
#endif  /* INCLUDE_TIMESTAMP */