Ok, but why do I get a very big number, even if I execute the
cyg_current_time() when the eCos starts?
What is the version of eCos your are using and on what type of HW ?
I'm using eCos 2.0 for a property MIPS target platform.
I have worked with Synthetic Target ant it works fine (as you suggest),
but when I use my Board I get a wrong value (I'll investigate).
I just ran the following code on the synthetic target:
while (1)
{
diag_printf("%d\n", cyg_current_time());
cyg_thread_delay(100);
}
and the output is:
0
100
200
300
400
500
600
700
800
900
1000
after 10 seconds.
The timing device is usually a hardware timer which can generate an
interrupt after a
specified amount of internal ticks. This timer gets initialized with
HAL_CLOCK_PERIOD
which "is" 10ms (by default) in hw timer ticks. The HAL_CLOCK_READ macro
returns
the number of hw timer internal ticks elapsed since the last interrupt.
Is HAL_CLOCK_PERIOD the time between two interrupts or two internal
ticks?
HAL_CLOCK_PERIOD is the number of hw timer internal ticks between two RTC
interrupts. And it is a platform dependent value, because it depends on
the frequency of
hw timer.
Therefore, after an amount of internal ticks a Interrupt is generated;
when the interrupt occurs, I think that will be named the
Cyg_RealTimeClock::ISR and the Cyg_RealTimeClock::DSR methods.
What do they do?