[Gmecm] Any USB developers out there?

[Craig Moates]

Yep, it fits in the V6, 98LS1, etc now. Muahaha!

Best regards,
Craig Moates


----- Original Message ----- 
From: "Programmer" <lwester at lincsat.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, November 22, 2006 5:26 PM
Subject: Re: [Gmecm] Any USB developers out there?


> Hey Craig,
> 
> I see the new board is quite a bit smaller...nice work !
> 
> Lyndon.
> 
> ----- Original Message ----- 
> From: "Craig Moates" <craig.moates at cox.net>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, November 22, 2006 8:37 AM
> Subject: Re: [Gmecm] Any USB developers out there?
> 
> 
>> Steve,
>>
>> Ok, cool. That all sounds consistent then. Glad it's going! Maybe the xtal 
>> frequency needs to be accounted for appropriately in the PIC's fuse bit 
>> settings? Like a clock divisor for the USB bus? That'd be sweet if that's 
>> all it is.
>>
>> I've been using Eagle 4.16 for pretty much everything. Some folks groan 
>> about it, but in my experience, everything has a downside. But it gets the 
>> job done and helps greatly when it comes to exchanging ideas and 
>> information.
>>
>> If you'd like me to take a stab at revising the layout, I'd be happy to. 
>> I've done some work around trying to optimize the 68HC58 incorporation. 
>> Here's one that I did:
>> http://www.moates.net/images/rr2/rr2_compare.jpg
>> Top right of leftmost picture. Been going to smaller 0402 components, 
>> they're sweet ;^).
>>
>> Best regards,
>> Craig Moates
>>
>>
>> ----- Original Message ----- 
>> From: "Steve Ravet" <Steve.Ravet at arm.com>
>> To: <gmecm at diy-efi.org>
>> Sent: Sunday, November 19, 2006 11:41 PM
>> Subject: RE: [Gmecm] Any USB developers out there?
>>
>>
>>
>>
>>> -----Original Message-----
>>> From: gmecm-bounces at diy-efi.org
>>> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Craig Moates
>>> Sent: Thursday, November 09, 2006 11:51 AM
>>> To: gmecm at diy-efi.org
>>> Subject: Re: [Gmecm] Any USB developers out there?
>>>
>>> Steve,
>>>
>>> Definitely check the crystal and capacitor areas. Those are
>>> ceramics you are using for the 18pF set? Check that it's set
>>> up for 18pf on the xtal desired capacitance?
>>
>> The crystal is 20 MHz 18pf according to the digikey datasheet.  They're
>> ceramic caps.
>>
>> I don't know what the problem with the crystal circuit is, but I removed
>> it and used a 4 MHz OSC instead, changing the firmware accordingly, and
>> now it works.  I tried with and without the load resistor (on the
>> crystal) but no change.  The demo board has an external load resistor
>> but the data sheet shows a resistor internal to the part.
>>
>> I decided that I want USB power after all so I can reflash the PIC
>> without external power.  You mentioned the circuit you use but I can't
>> find the note now.  What is it?
>>
>> Craig, what do you use for schematic capture and PCB layout?
>>
>> Maybe there'll be a USB <-> VPW project working by Christmas now...
>>
>> thanks for the suggestions everyone,
>>
>> --steve
>>
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> 
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