Re: A few questions about modifications in carl9170

[Ignacy Gawedzki <i@lri.fr>]

On Tue, Sep 28, 2010 at 02:04:59PM +0200, thus spake Christian Lamparter:
> On Tuesday 28 September 2010 08:27:21 Ignacy Gawedzki wrote:
> > AFAICT there's a constant in timer.h :
> > 
> >   #define AR9170_TICKS_PER_MICROSECOND    80
> it is supposed to be 25 ns clock counter

I don't get what you mean by that.  Is anything wrong with this constant?

> clock_set sets the CPUs clock, which has an effect on timer0-3 but not
> on the clock source.

Ah okay, very well.

> > I then need to consider the case where comp_tsf ends up not being larger
> > than tsfl.  Since > we're dealing with unsigned ints, in this case the
> > simple difference would end up being something rather large. :/
> Too much bad literature.

In my case that must be too little literature overall.

> Give it a try, set comp_tsfl = 0x10 and super->s.tsfl = 0xfffff000.
> then comp_tsfl - super->s.tsfl equals to 0x10 - 0xfffff000, which on
> a 32-bit arch gives you 0x00001010 (+ carry/borrow)

Ha ha... shame on me. =)

Thanks for the lesson, master.

Regards,

Ignacy

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