source:
rtems/c/src/lib/libbsp/or32/orp/timer/timerisr.c
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a24d946
Last change on this file since a24d946 was a24d946, checked in by Joel Sherrill <joel.sherrill@…>, on 08/06/02 at 13:57:03 | |
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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) 1989-1999. |
17 | * On-Line Applications Research Corporation (OAR). |
18 | * |
19 | * The license and distribution terms for this file may be |
20 | * found in the file LICENSE in this distribution or at |
21 | * http://www.OARcorp.com/rtems/license.html. |
22 | * |
23 | * $Id$ |
24 | */ |
25 | |
26 | #include <rtems.h> |
27 | |
28 | extern rtems_unsigned32 _Timer_interrupts; |
29 | |
30 | void timerisr( void ) |
31 | { |
32 | /* |
33 | * _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS (usually in microseconds) |
34 | * return from interrupt |
35 | */ |
36 | } |
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