[GreenKeys] RS232 to TTY Loop Boards

[epvgk at limpoc.com]

On Mon, Feb 16, 2015 at 09:06:58PM +0000, Hugh Pyle wrote:
> FWIW, I've done a half of something similar, for the 33, using the USB UART
> on Teensy 3.0.   The USB piece is trivially easy.   It will handle 110
> baud, but not 45 or fractional stop-bits; you'd need Eric's bit-banging
> work to do that.   Anyway, here's the current (untested cos hardware)
> version of mine.
> 
> https://github.com/hughpyle/ASR33
> 
> -Hugh

Oh, good, that seems like the same general idea. I haven't tried with the ARM chip
on the teensy (MK20DX?) but I've been able to get the hardware UART on another ARM
mcu (philips/nxp LPC2148) to speak 45 baud by selecting the time constants right. 
So maybe with some fiddling this one could too. 
I'm not the original author of the bitbanging code, I just hacked it up to do the
right timing and framing for 45 baud, but regardless it's not pretty... 

eric

> 
> 
> On Mon, Feb 16, 2015 at 7:44 PM, <epvgk at limpoc.com> wrote:
> 
> > On Mon, Feb 16, 2015 at 02:20:09PM -0500, Lester Veenstra wrote:
> > > So where do we find code that will get  a Silicon Laboratories CP2102 to
> > 45 baud?
> > >
> > oh i neglected to mention i *have* written the code that will do usb-tty
> > conversion
> > for Atmega32u4 so that's up for grabs if you'd like to use it.
> >
> > eric
> >
> > >
> > >
> > >
> > >
> > > Lester B Veenstra  M??YCM K1YCM W8YCM
> > >
> > >  <mailto:lester at veenstras.com> lester at veenstras.com
> > >
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> > > From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
> > Mark Hall
> > > Sent: Sunday, February 15, 2015 10:32 PM
> > > To: greenkeys at mailman.qth.net
> > > Subject: Re: [GreenKeys] RS232 to TTY Loop Boards
> > >
> > >
> > >
> > > Hello all!
> > >
> > > I have been looking at the encased loop supply /RS 232 to TTY Loop
> > Boards that John Nagle and Steve Garrison
> > >
> > > have built. Their boxes feature a USB to RS 232 interface- a "Silicon
> > Laboratories CP2102-EB evaluation board" that
> > > allows the user to reconfigure the interface to 45 baud by using an
> > archived program. If there was some way to fabricate
> > >
> > > a board based on the Nagle board, with a direct interface to USB rather
> > than via an adapter for RS 232, this would be
> > >
> > > pretty nifty. I have one old Dell desktop running XP Pro that has both
> > serial and USB ports, but USB seems to be the
> > >
> > > direction things are going now. Unless it's a custom-built laptop-
> > something so "bespoke" that it could be literally "made
> > > to order"...
> > >
> > > If anyone decides to order boards, I'd like to get in on a buy. Many
> > thanks!
> > >
> > >
> > >
> > > 73 de KE5LIB!
> > >
> > > Mark
> > >
> >
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