source: rtems/c/src/lib/libbsp/no_cpu/no_bsp/timer/timerisr.c @ 7f6a24ab

4.104.114.84.95
Last change on this file since 7f6a24ab was ac7d5ef0, checked in by Joel Sherrill <joel.sherrill@…>, on May 11, 1995 at 5:39:37 PM

Initial revision

  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*  timerisr.s
2 *
3 *  If required this ISR is used to bump a count of interval "overflow"
4 *  interrupts which have occurred since the timer was started.  The
5 *  number of overflows is taken into account in the Read_timer()
6 *  routine if necessary.
7 *
8 *  To reduce overhead this is best to be the "rawest" hardware interupt
9 *  handler you can write.  This should be the only interrupt which can
10 *  occur during the measured time period.
11 *
12 *  NOTE:  This file is USUALLY in assembly and is LEAN AND MEAN.
13 *         Any code in this isr is pure overhead which can perturb
14 *         the accuracy of the Timing Test Suite.
15 *
16 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
17 *  On-Line Applications Research Corporation (OAR).
18 *  All rights assigned to U.S. Government, 1994.
19 *
20 *  This material may be reproduced by or for the U.S. Government pursuant
21 *  to the copyright license under the clause at DFARS 252.227-7013.  This
22 *  notice must appear in all copies of this file and its derivatives.
23 *
24 *  $Id$
25 */
26
27#include <rtems.h>
28
29extern rtems_unsigned32 _Timer_interrupts;
30
31void timerisr( void )
32{
33  /*
34   *  _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS  (usually in microseconds)
35   *  return from interrupt
36   */
37}
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