1 /*
2 * FreeRTOS V202212.00
3 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
6 * this software and associated documentation files (the "Software"), to deal in
7 * the Software without restriction, including without limitation the rights to
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
9 * the Software, and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * https://www.FreeRTOS.org
23 * https://github.com/FreeRTOS
24 *
25 */
26
27
28 /*
29 * Utility functions required to gather run time statistics. See:
30 * https://www.FreeRTOS.org/rtos-run-time-stats.html
31 *
32 * Note that this is a simulated port, where simulated time is a lot slower than
33 * real time, therefore the run time counter values have no real meaningful
34 * units.
35 *
36 * Also note that it is assumed this demo is going to be used for short periods
37 * of time only, and therefore timer overflows are not handled.
38 */
39
40 /* FreeRTOS includes. */
41 #include <FreeRTOS.h>
42
43 /* Variables used in the creation of the run time stats time base. Run time
44 * stats record how much time each task spends in the Running state. */
45 static long long llInitialRunTimeCounterValue = 0LL, llTicksPerHundredthMillisecond = 0LL;
46
47 /*-----------------------------------------------------------*/
48
vConfigureTimerForRunTimeStats(void)49 void vConfigureTimerForRunTimeStats( void )
50 {
51 LARGE_INTEGER liPerformanceCounterFrequency, liInitialRunTimeValue;
52
53 /* Initialise the variables used to create the run time stats time base.
54 * Run time stats record how much time each task spends in the Running
55 * state. */
56
57 if( QueryPerformanceFrequency( &liPerformanceCounterFrequency ) == 0 )
58 {
59 llTicksPerHundredthMillisecond = 1;
60 }
61 else
62 {
63 /* How many times does the performance counter increment in 1/100th
64 * millisecond. */
65 llTicksPerHundredthMillisecond = liPerformanceCounterFrequency.QuadPart / 100000LL;
66
67 /* What is the performance counter value now, this will be subtracted
68 * from readings taken at run time. */
69 QueryPerformanceCounter( &liInitialRunTimeValue );
70 llInitialRunTimeCounterValue = liInitialRunTimeValue.QuadPart;
71 }
72 }
73 /*-----------------------------------------------------------*/
74
ulGetRunTimeCounterValue(void)75 unsigned long ulGetRunTimeCounterValue( void )
76 {
77 LARGE_INTEGER liCurrentCount;
78 unsigned long ulReturn;
79
80 /* What is the performance counter value now? */
81 QueryPerformanceCounter( &liCurrentCount );
82
83 /* Subtract the performance counter value reading taken when the
84 * application started to get a count from that reference point, then
85 * scale to (simulated) 1/100ths of a millisecond. */
86 if( llTicksPerHundredthMillisecond == 0 )
87 {
88 /* The trace macros can call this function before the kernel has been
89 * started, in which case llTicksPerHundredthMillisecond will not have been
90 * initialised. */
91 ulReturn = 0;
92 }
93 else
94 {
95 ulReturn = ( unsigned long )
96 ( ( liCurrentCount.QuadPart - llInitialRunTimeCounterValue ) /
97 llTicksPerHundredthMillisecond );
98 }
99
100 return ulReturn;
101 }
102 /*-----------------------------------------------------------*/
103