On 04/26/2013 02:59 AM, kidd wrote:
> Hi Gilles
> You are right about the reason to generate the problem above. When
> "main" function of latency started "latency_task", the "latency" funciton
> would call "rt_task_set_periodic" function, and then
> "xntimer_start_aperiodic" finally. The "xntimer_start_aperiodic" funciton
> returns -ETIMEDOUT, Error.
> I found that the reason to this error is the data returned from
> "__ipipe_tsc_get".("__ipipe_tsc_get" is defined in
> "arch/arm/kernel/armv-entry.S" under Linux source code directory, and the
> function returns 0 directly, I think the reason of problem is the function
> returns 0 directly)
If you enable IPIPE_ARM_KUSER_TSC, you need to register a tsc with
__ipipe_tsc_register, as described here:
http://xenomai.org/index.php/I-pipe-core:ArmPorting#High_resolution_counter
Otherwise, you need to implement the function __ipipe_mach_get_tsc() as
described here:
http://xenomai.org/index.php/I-pipe:ArmPorting#Implementing_a_high-resolution_counter.
For the third time, please take the time to read the I-pipe porting
guide(s), in order to understand what you are doing.
The next private mail you send me will remain unanswered.
--
Gilles.
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