IAR PowerPac RTOS User Guide

Performance and resource usage*/static void LPTask(void) {OS_U32 MeasureOverhead;OS_U32 v;// Time for Measure Overhead//// Measure overhead for time measurement so we can take this into// account by subtracting it OS_Timing_Start(&MeasureOverhead);// OS_Timing_End(&MeasureOverhead);//// Perform measurements in endless loop//while (1) {OS_Delay(100);// Syncronize to tick to avoid jitterOS_Timing_Start(&_Time); // Start measurementOS_Resume(&TCBHP);// Resume high priority task to force task switchv = OS_Timing_GetCycles(&_Time) - OS_Timing_GetCycles(&MeasureOverhead);v = OS_ConvertCycles2us(1000 * v);printf("Context switch time: %u.%.3u usec\r\n", v / 1000, v % 1000);}}The example program calculates and subtracts the measurement overhead itself, so there is no need to do this. Use theC-SPY terminal I/O window to check the results.PPRTOS-2131