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Re: at91Arm7sek running without the pll
- From: Andrew Lunn <andrew at lunn dot ch>
- To: Tobias Nielsen <tobibobi at gmail dot com>
- Cc: ecos-discuss at ecos dot sourceware dot org
- Date: Mon, 25 Feb 2008 17:00:36 +0100
- Subject: Re: [ECOS] at91Arm7sek running without the pll
- References: <df538ac70802250647s5a285e92wf90ccb90c33783c4@mail.gmail.com>
On Mon, Feb 25, 2008 at 03:47:26PM +0100, Tobias Nielsen wrote:
> I have been sitting for some time to try to figure out a way to
> completely skip the PLL AND at the same time use the main oscillator
> bypass feature. I can see that the usage of the PLL is more or less
> directly coded in to a macro in the header:
>
> hal/arm/at91/at91sam7s/current/include/hal_platform_setup.h
>
> But if i want to completely bypass that feature and follow the
> instructions in the datasheet that states OSCBYPASS should be set to 1
> and MOSCEN must be set 0 - i have absolutely no idea on how to put
> that functionality in to the system without hacking a lot of code that
> i in principle have no knowledge about...
>
> Do anyone know how to make that bypass?
It will be a little bit messy.
Why do you need to turn the PLL off? Can you live with the PLL simply
multiplying by 1 and dividing by 1?
Andrew
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