From: Julian Elischer <[EMAIL PROTECTED]>
Subject: Re: Rewriting pca(4) using finetimer(9) (was: Re: MPU401 now works
under New Midi Driver Framework with a Fine Timer)
Date: Thu, 8 Jul 1999 11:23:42 -0700 (PDT)
Message-ID: <[EMAIL PROTECTED]>
julian> this is problematic.
julian> you cannot add a new element before the pending firing because you can't
julian> tell how far into the present trigger you are.
The workaround below would help it. The time elapsed since the last
aquire_timer0() can be determined by latching the timer counter.
From: Seigo Tanimura <[EMAIL PROTECTED]>
Subject: Re: Rewriting pca(4) using finetimer(9) (was: Re: MPU401 now worksunder New
Midi Driver Framework with a Fine Timer)
Date: Thu, 08 Jul 1999 18:40:23 +0900
Message-ID: <[EMAIL PROTECTED]>
tanimura> > t' > \sum_(k=0)^(j) dt_rem(c_k)
tanimura> >
tanimura> > where the right hand side of the inequality is the time span after which
tanimura> > the callout c_k is made. Then c' is inserted after c_j and new
dt_rem(c_(j+1))
tanimura> > and dt_rem(c_(j+2)) are determined. Now we can acquire_timer0() with
dt_rem(c_0).
tanimura>
tanimura> If t' is less than dt_rem(c_0) then we have no feasible j. This is the case
tanimura> in which we must reaquire_timer0() using t'. Then, after interting c',
dt_rem(c_1)
tanimura> is updated to be (dt_rem(c_1) - (time elapsed since the last
aquire_timer0())),
tanimura> so that c_1 can be armed later.
Seigo Tanimura <[EMAIL PROTECTED]>
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