Gilles Chanteperdrix wrote: > Sebastian Smolorz wrote: > > Sebastian Smolorz wrote: > > > Gilles Chanteperdrix wrote: > > > > Schlägl "Manfred jun." wrote: > > > > > Hi again! > > > > > > > > > > I've the presumption, there is something wrong with my > > > > > timer-handling. Could you please take a look at my handling. > > > > > > > > > > Thanks in advance! > > > > > > > > The problem I see with your code is that you are updating > > > > ns_timer_lxlost in __ipipe_mach_acktimer, the integrator > > > > architecture code, which also uses a decrementer does not do that. > > > > Apart from that, I see nothing wrong. > > > > > > I see another one which has to do with the fact that __ipipe_mach_tsc > > > is updated both in __ipipe_mach_get_tsc and __ipipe_mach_set_dec. This > > > leads to double-added ticks because the latter funcion is called only > > > once a period and the former even more than once. So Xenomai counts > > > jiffies in /proc/xenomai/timer to fast. Manfred, can you confirm this? > > > > Forget this, my eyes weren't open this morning ... In > > __ipipe_mach_get_tsc there is no update of __ipipe_mach_tsc, of course. > > Right, but __ipipe_mach_tsc and ns_timer_lxlost get also updated in > __ipipe_mach_acktimer, this looks wrong, in the integrator > implementation, they are updated in the timer interrupt, only if the > timer is not stolen.
OK, let's speculate a little bit. (Maybe all of the following turns out to be completely wrong, but it wouldn't be the first time for me today. ;-) Hopefully Manfred can give some comments which pieces of my speculation are right.) The timer counts down to zero, causes an interrupt and then reloads automatically with ns_timer_reload. So, when __ipipe_mach_acktimer is called ns_timer_reload ticks have passed and can be added to __ipipe_mach_tsc and ns_timer_lxlost. Some ticks later, __ipipe_mach_set_dec is executed, the passed ticks are added to __ipipe_mach_tsc and ns_timer_lxlost and the timer is reprogrammed to the new value. Could be right ... Sebastian _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
