4.115
Last change
on this file since 24bf11e was
24bf11e,
checked in by Sebastian Huber <sebastian.huber@…>, on 02/12/14 at 09:31:38
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score: Add CPU counter support
Add a CPU counter interface to allow access to a free-running counter.
It is useful to measure short time intervals. This can be used for
example to enable profiling of critical low-level functions.
Add two busy wait functions rtems_counter_delay_ticks() and
rtems_counter_delay_nanoseconds() implemented via the CPU counter.
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Property mode set to
100644
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File size:
738 bytes
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1 | /* |
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2 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.com/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #ifdef HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/counter.h> |
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20 | |
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21 | void rtems_counter_delay_ticks( rtems_counter_ticks ticks ) |
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22 | { |
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23 | rtems_counter_ticks a = rtems_counter_read(); |
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24 | rtems_counter_ticks delta = 0; |
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25 | |
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26 | do { |
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27 | rtems_counter_ticks b; |
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28 | |
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29 | ticks -= delta; |
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30 | |
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31 | b = rtems_counter_read(); |
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32 | delta = rtems_counter_difference( b, a ); |
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33 | a = b; |
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34 | } while ( ticks > delta ); |
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35 | } |
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