5
Last change
on this file since 599d71f was
c499856,
checked in by Chris Johns <chrisj@…>, on 03/20/14 at 21:10:47
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Change all references of rtems.com to rtems.org.
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-
Property mode set to
100644
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File size:
1.1 KB
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Rev | Line | |
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[24bf11e] | 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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[c499856] | 12 | * http://www.rtems.org/license/LICENSE. |
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[24bf11e] | 13 | */ |
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| 14 | |
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| 15 | #include <rtems/counter.h> |
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| 16 | |
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| 17 | RTEMS_STATIC_ASSERT(sizeof(rtems_counter_ticks) <= sizeof(uint32_t), type); |
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| 18 | |
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| 19 | static uint64_t to_ns_scaler = UINT64_C(1) << 32; |
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| 20 | |
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| 21 | static uint64_t from_ns_scaler = UINT64_C(1) << 32; |
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| 22 | |
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| 23 | uint64_t rtems_counter_ticks_to_nanoseconds( rtems_counter_ticks counter ) |
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| 24 | { |
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| 25 | return (uint32_t) ((counter * to_ns_scaler) >> 32); |
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| 26 | } |
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| 27 | |
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| 28 | rtems_counter_ticks rtems_counter_nanoseconds_to_ticks( uint32_t nanoseconds ) |
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| 29 | { |
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| 30 | return (rtems_counter_ticks) ((nanoseconds * from_ns_scaler) >> 32); |
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| 31 | } |
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| 32 | |
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| 33 | void rtems_counter_initialize_converter( uint32_t frequency ) |
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| 34 | { |
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| 35 | uint64_t ns_per_s = UINT64_C(1000000000); |
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| 36 | |
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| 37 | to_ns_scaler = ((ns_per_s << 32) + frequency - 1) / frequency; |
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| 38 | from_ns_scaler = ((UINT64_C(1) << 32) * frequency + ns_per_s - 1) / ns_per_s; |
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| 39 | } |
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