begriffs open source - cmsis-freertos/blob - Demo/WIN32-MingW/Run-time-stats-utils.c

1 /*

4

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18 ***************************************************************************

19

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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following

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67 1 tab == 4 spaces!

68 */

69

70 /*

71 * Utility functions required to gather run time statistics. See:

72 * http://www.freertos.org/rtos-run-time-stats.html

73 *

74 * Note that this is a simulated port, where simulated time is a lot slower than

75 * real time, therefore the run time counter values have no real meaningful

76 * units.

77 *

78 * Also note that it is assumed this demo is going to be used for short periods

79 * of time only, and therefore timer overflows are not handled.

80 */

81

82 /* FreeRTOS includes. */

83 #include <FreeRTOS.h>

84

85 /* FreeRTOS+Trace includes. */

86 #include "trcUser.h"

87

88 /* Variables used in the creation of the run time stats time base. Run time

89 stats record how much time each task spends in the Running state. */

90 static long long llInitialRunTimeCounterValue = 0LL, llTicksPerHundedthMillisecond = 0LL;

91

92 /*-----------------------------------------------------------*/

93

94 void vConfigureTimerForRunTimeStats( void )

95 {

96 LARGE_INTEGER liPerformanceCounterFrequency, liInitialRunTimeValue;

97

98 /* Initialise the variables used to create the run time stats time base.

99 Run time stats record how much time each task spends in the Running

100 state. */

101

102 if( QueryPerformanceFrequency( &liPerformanceCounterFrequency ) == 0 )

103 {

104 llTicksPerHundedthMillisecond = 1;

105 }

106 else

107 {

108 /* How many times does the performance counter increment in 1/100th

109 millisecond. */

110 llTicksPerHundedthMillisecond = liPerformanceCounterFrequency.QuadPart / 100000LL;

111

112 /* What is the performance counter value now, this will be subtracted

113 from readings taken at run time. */

114 QueryPerformanceCounter( &liInitialRunTimeValue );

115 llInitialRunTimeCounterValue = liInitialRunTimeValue.QuadPart;

116 }

117 }

118 /*-----------------------------------------------------------*/

119

120 unsigned long ulGetRunTimeCounterValue( void )

121 {

122 LARGE_INTEGER liCurrentCount;

123 unsigned long ulReturn;

124

125 /* What is the performance counter value now? */

126 QueryPerformanceCounter( &liCurrentCount );

127

128 /* Subtract the performance counter value reading taken when the

129 application started to get a count from that reference point, then

130 scale to (simulated) 1/100ths of a millisecond. */

131 if( llTicksPerHundedthMillisecond == 0 )

132 {

133 /* The trace macros are probably calling this function before the

134 scheduler has been started. */

135 ulReturn = 0;

136 }

137 else

138 {

139 ulReturn = ( unsigned long ) ( ( liCurrentCount.QuadPart - llInitialRunTimeCounterValue ) / llTicksPerHundedthMillisecond );

140 }

141

142 return ulReturn;

143 }

144 /*-----------------------------------------------------------*/