5
Last change
on this file since ddb6a49b was
31be416,
checked in by Alexander Krutwig <alexander.krutwig@…>, on 04/20/15 at 09:08:22
|
timecounter: Port to RTEMS
New test sptests/timecounter01.
Update #2271.
|
-
Property mode set to
100644
|
File size:
1.3 KB
|
Line | |
---|
1 | /* |
---|
2 | * Copyright (c) 2015 embedded brains GmbH. All rights reserved. |
---|
3 | * |
---|
4 | * embedded brains GmbH |
---|
5 | * Dornierstr. 4 |
---|
6 | * 82178 Puchheim |
---|
7 | * Germany |
---|
8 | * <rtems@embedded-brains.de> |
---|
9 | * |
---|
10 | * The license and distribution terms for this file may be |
---|
11 | * found in the file LICENSE in this distribution or at |
---|
12 | * http://www.rtems.org/license/LICENSE. |
---|
13 | */ |
---|
14 | |
---|
15 | #if HAVE_CONFIG_H |
---|
16 | #include "config.h" |
---|
17 | #endif |
---|
18 | |
---|
19 | #include <rtems/timecounter.h> |
---|
20 | |
---|
21 | void rtems_timecounter_simple_install( |
---|
22 | rtems_timecounter_simple *tc, |
---|
23 | uint32_t frequency_in_hz, |
---|
24 | uint32_t counter_ticks_per_clock_tick, |
---|
25 | timecounter_get_t *get_timecount |
---|
26 | ) |
---|
27 | { |
---|
28 | uint32_t power_of_two = 1; |
---|
29 | uint32_t mask; |
---|
30 | uint64_t scaler; |
---|
31 | int i; |
---|
32 | |
---|
33 | for ( i = 0; i < 32; ++i ) { |
---|
34 | if ( power_of_two >= counter_ticks_per_clock_tick ) { |
---|
35 | break; |
---|
36 | } |
---|
37 | |
---|
38 | power_of_two *= 2; |
---|
39 | } |
---|
40 | |
---|
41 | mask = ( 2 * power_of_two ) - 1; |
---|
42 | scaler = ( (uint64_t) power_of_two << 32 ) / counter_ticks_per_clock_tick; |
---|
43 | |
---|
44 | tc->scaler = scaler; |
---|
45 | tc->real_interval = counter_ticks_per_clock_tick; |
---|
46 | tc->binary_interval = ( mask + 1 ) / 2; |
---|
47 | tc->tc.tc_get_timecount = get_timecount; |
---|
48 | tc->tc.tc_counter_mask = mask; |
---|
49 | tc->tc.tc_frequency = (uint32_t) ( ( frequency_in_hz * scaler ) >> 32 ); |
---|
50 | tc->tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER; |
---|
51 | _Timecounter_Install( &tc->tc ); |
---|
52 | } |
---|
Note: See
TracBrowser
for help on using the repository browser.