sleep.c

自学ZedBoard：使用IP通过ARM PS访问FPGA（源代码）

/* $Id: sleep.c,v 1.1.4.1 2011/10/24 09:35:15 sadanan Exp $ */
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/**
*
* @file usleep.c
*
* This function provides a second delay using the Global Timer register in
* the ARM Cortex A9 MP core.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who      Date     Changes
* ----- -------- -------- -----------------------------------------------
* 1.00a ecm/sdm  11/11/09 First release
* 3.06a sgd      05/15/12 Upadted sleep function to make use Global Timer
* 3.06a asa		 06/17/12 Reverting back the previous change to use Global
*						  Timer.
* </pre>
*
******************************************************************************/
/***************************** Include Files *********************************/

#include "sleep.h"
#include "xtime_l.h"
#include "xparameters.h"

#define COUNTS_PER_SECOND          (XPAR_CPU_CORTEXA9_CORE_CLOCK_FREQ_HZ / 64)

int sleep(unsigned int seconds)
{
  XTime tEnd, tCur;

  XTime_GetTime(&tCur);
  tEnd  = tCur + ((XTime) seconds) * COUNTS_PER_SECOND;
  do
  {
    XTime_GetTime(&tCur);
  } while (tCur < tEnd);

  return 0;
}