>You don't want to modify that code, just look at how it computes time
>at a nanosecond scale.
>Look at the function show_time_in_us() which uses time values
>based on the function HAL_CLOCK_READ() that reads the system timer
>(whatever that may be) and calculates time to the most accurate
>value available in the system. This is based on the raw clock
>(often the hardware system clock) that's used to run the system
>'tick' timer. On most systems, this value is accurate to micro-seconds,
>sometimes even nano-seconds.
Hi Gary,
I found the function gettimeofday() which returns the time in us.
I create a simple application with eCos containing 1 thread,i like to
measure the
execution time(us) of the thread.
void taska(cyg_addrword_t data)
{
struct timeval tv1,tv2;
long long diff;
while(1)
{
gettimeofday (&tv1, NULL);
cyg_mutex_lock(&cliblock);
printf("TASKA \n");
cyg_mutex_unlock(&cliblock);
cyg_thread_delay(2);
gettimeofday (&tv2, NULL);
diff=(tv2.tv_sec-tv1.tv_sec) * 1000000 + (tv2.tv_usec-tv1.tv_usec);
printf("Time tv1 is %d\n",tv1.tv_usec);
printf("Time tv2 is %d\n",tv2.tv_usec);
printf("The diff is =%d usec\n",diff);
};
}
when i run this application in Tsim(simulator of Leon3):
Time tv1 is 286326803
Time tv2 is 286326801
The diff is -1 usec
Can you tell me what the fault in my program?
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