Re: Timing in Synch Comm.
- From: JosephKK <joseph_barrett@xxxxxxxxxxxxx>
- Date: Tue, 25 Sep 2007 03:59:45 GMT
Joerg notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx posted to
sci.electronics.design:
Jon Slaughter wrote:
"Vladimir Vassilevsky" <antispam_bogus@xxxxxxxxxxx> wrote in
message news:TMCIi.28025$eY.691@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Jon Slaughter wrote:
I'm writing a windows app which sends data to the parallel port
but because its pre-emptive there can be extreme latency in the
timing.
Actually I'm trying to do it any synch communications. SPI, I2C,
and ICSP will be some of the protocols I'll try and implement.
There is no point in developing anything for the parallel port now.
This is what you need:
http://www.ftdichip.com/Products/FT2232C.htm
Well, I wanted to hook directly up to some devices with minimum
external circuitry. Eventually I might add support for usb and some
other devices but at this point all I have is the parallel port.
I'm essentially just making something that is similar to WinPic. So
if I wanted to program so some pics or play with some controllers
that use some some communications method I could do it quite easily
by just typing in the commands and have the program do the rest(its
more work than that but it would only need to be done once).
But keep in mind that when your PC croaks the new one might no
longer have a parallel port. Adapters might be available for a while
but aren't 100% the same. Then all your work could be flushed down
the drain. Personally I'd go RS232 since USB-RS232 should be
available for a long time.
I would not bet on that either, while USB ip is cheap ethernet ip is
free like RS232 and RS485.
USB will survive in applications where "provable" hardware connections
are still valuable (DRM). Eventually even that will collapse.
.
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