leon3/start/bspdelay.c

0001 /**
0002  *  @file
0003  *
0004  *  LEON3 BSP Delay Method
0005  */
0006
0007 /*
0008  *  COPYRIGHT (c) 1989-2011.
0009  *  On-Line Applications Research Corporation (OAR).
0010  *
0011  *  The license and distribution terms for this file may be
0012  *  found in the file LICENSE in this distribution or at
0013  *  http://www.rtems.org/license/LICENSE.
0014  */
0015
0016 #include <bsp.h>
0017 #include <bsp/leon3.h>
0018
0019 void rtems_bsp_delay(int usecs)
0020 {
0021   uint32_t then;
0022   gptimer_timer *regs;
0023
0024   regs = &LEON3_Timer_Regs->timer[0];
0025   then  =grlib_load_32(&regs->tcntval);
0026   then += usecs;
0027
0028   while (grlib_load_32(&regs->tcntval) >= then)
0029     ;
0030 }