Hey everyone.  I am also working on a PIC A/D (well A/D/D is probably =

more apt) + USB project (this is my first electronics project ever, but =

learning how to blink leds is for sane people, I'm working on a dual-use =

board that will convert NES and SNES controllers to USB... the only =

other requirement is the PIC chips must be able to be flashed =

in-circuit).  I have very little experience (being first electronic =

project and all) but I have about 200 PDFs mostly memorized as well as a =

dozen ASM/PIC/C softcover books and will try to answer any specific =

question I can.

Tony R.

Mat Clayton wrote:
> Hey, thanks for the comments, Personally I need no where near that sample
> rate, (somewhere in a few 10's-100's of kHz should be fine), but there ar=
e a
> few people who are after that sort of rate, using external ADC's. At the
> moment we are all trying to pool our efforts, just using the internal ADC
> until the ADC is the limiting factor. =

>
> Where exactly did microchip say make your own driver? I would be interest=
ed
> on any comments about the speeds achievable, as I don't believe I have se=
en
> anything quoted for the microchip firmware...
> Mat
>
> www.piccoder.co.uk
>
>
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf =
Of
> Mauricio Giovagnini
> Sent: 23 April 2006 15:13
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] USB resistors
>
>
> Mat Clayton wrote:
>   =

>> Is anyone else working on ADC sampling through the USB currently? We are =

>> currently trying to figure out the best way to go about this,(aiming for=
 a
>>     =

>
>   =

>> few 100kHz-1Mhz if possible), any suggests or comments would be most =

>> welcome.
>>
>> Mat
>>   =

>>     =

>
> I will work with a 18F4520 in a near future, I've read some datasheets =

> regarding the USB connection.
>
> Just as an advice, If i understand weel,  you are trying to do a 1M =

> sample A/D conversion? If you are thinking in using the internal A/D =

> module, as far as I know this is impossible with the pic you have, the =

> A/D is simply not that fast.
>
> Also a 1M samples at 10bits, will mean at the best 10Mbps usb =

> transmission.  For that, as Microchip says, you should design your own =

> USB driver.
>
>
> Best Regards
> __________________________________________________
> Correo Yahoo!
> Espacio para todos tus mensajes, antivirus y antispam =A1gratis! =

> =A1Abr=ED tu cuenta ya! - http://correo.yahoo.com.ar
>   =

-- =

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