On Mon, Dec 06, 2010 at 05:20:38PM +0530, Felix Fietkau wrote:
> On 2010-12-06 12:44 PM, Vasanthakumar Thiagarajan wrote:
> >> > I don't have any doc for this register yet.
> >> I'm pretty sure that the format of the register is still exactly the
> >> same. I guess they added a small frequency offset to reduce spur.
> >>
> >> >> But how exactly is *one* magic number (and it's even a very small one)
> >> >> worse than 14 of them, especially since anybody can verify that the
> >> >> generated raw values are exactly the same?
> >> >
> >> > Anyway, still this formula gets it wrong for channel 14.
> >> > Lets have this table for now, I'll clean this up once I
> >> > get the proper doc for this register?.
> >> How did you test this? When I put this part into a test program, it
> >> generates exactly the same values as the table all channels,
> >> including 14.
> >
> > I just did the following
> >
> > #define CHANSEL_2G_9485(_freq) ((((freq) * 0x10000) - 215) / CHANSEL_DIV)
> > for (i = 0; i < 14; i++) {
> > freq = 2412 + (i * 5);
> > printk("chan %d : %x \n",i + 1,CHANSEL_2G_9485(freq));
> > }
> >
> > output:
> >
> > chan 1 : a0ccbe
> > chan 2 : a12213
> > chan 3 : a17769
> > chan 4 : a1ccbe
> > chan 5 : a22213
> > chan 6 : a27769
> > chan 7 : a2ccbe
> > chan 8 : a32213
> > chan 9 : a37769
> > chan 10 : a3ccbe
> > chan 11 : a42213
> > chan 12 : a47769
> > chan 13 : a4ccbe
> > chan 14 : a52213
> 2412 + 13 * 5 == 2477, not 2484.
oops, sorry.
Vasanth
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