Hello world Ada-example on RaspberryPi

[Jan Sommer]

Am Montag, 6. Juli 2015, 13:27:34 schrieb Joel Sherrill:
> 
> Just to make sure the math in the Pi clock driver is OK, it would be
> a good idea to change the microseconds per tick value in the ticker
> sample. If it stays true to running ~30 seconds, then the math is right
> in the driver. If it doesn't remain true to "real world" time, then
> the math in the Pi clock driver may be wrong.
> 

The ticker example all use the classic rtems API where you delay a certain number of ticks (if I am not mistaken).
Anyways I checked out the implementation of gnat for delay until and they use nanosleep.
Based on the posix_examples from examples-v2 I made a short test for nanosleep which tries sleeps for 10s (attached):

The results are: 
If CONFIGURE_MICROSECONDS_PER_TICK is not defined:  sleeps for 10 s.
If  CONFIGURE_MICROSECONDS_PER_TICK = RTEMS_MILLISECONDS_TO_MICROSECONDS(1): sleeps for 100 s
If  CONFIGURE_MICROSECONDS_PER_TICK = RTEMS_MILLISECONDS_TO_MICROSECONDS(10): sleeps for 10 s
If  CONFIGURE_MICROSECONDS_PER_TICK = RTEMS_MILLISECONDS_TO_MICROSECONDS(100): sleeps for 1 s

Where do I find the clock driver for the Pi? I am not sure if it is not too low level for me, but I can take a look.

Cheers,

   Jan
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