Thanks for the Raspberry Pi!

[Aleksandr Rybalko]

On Mon, 28 Jan 2013 06:15:05 -0500
George Mitchell <george at m5p.com> wrote:

> Today is my birthday, and the best present I have is that my Raspberry
> Pi is running FreeBSD plus CUPS and acting as a print server for the
> FreeBSD machines (and one Windoze machine) on my home network.  My
> sincere thanks go to everybody who helped bring FreeBSD to the ARM and
> specifically to the Pi.  It would be awesome if we could get ARM
> promoted to Tier 1 support this year.
> 
> I'm interested in working on a driver for the pulse-width modulation
> audio output on the Pi, and I have the Broadcom document describing how
> it works.  What are the chances I could base such a driver on some
> existing FreeBSD audio driver?                       -- George Mitchell
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Hi George,

Think you can base it on any simplest one.
Main difference in the clock, so if you want 8bit resolution at
44100Hz, you will need to set pwm clock to 2^8 * 44100 = 11289600, and
then just at freq 44100Hz program duty cycle for current sample.

Problem only in clocks, because for 16bits you must set 
2^16 * 44100 = 2890137600, so it is almost 3GHz :-D

Good luck!

WBW
-- 
Aleksandr Rybalko <ray at ddteam.net>