embedlets-developer

[Embedlets-dev] Light Blinker update and uVM serial multidrop network

[Ted K. <tk...@ya...>]

I submitted the Global Light Blinker proposal to the JXTA community and the
feedback that I received on the idea was all +1s so I have been moving ahead
with developing the software.

The next step in the process is to submit the project idea for formal approval
and I will do this as soon as I have a working demonstration.

The demonstration application is currently 90% functional and the main thing
that is preventing 100% functionality is a method in the JXTA core libraries
that has not been implemented yet.  I have been using the JXTA lists in order
to resolve this issue as soon as possible.

In the meantime, I am now ready to start working on the reference
implementation hardware design.



James,

Do you happen to have a diagram of your RS232 serial line multidrop design?  My
initial plan was to go with 1-Wire for the reference hardware but I am very
reluctant to deal with Dallas Semiconductor directly to obtain serial-to-1Wire
converters (DS9097Us) and it looks like we are about 3 months away from having
a second source for an equivalent serial-to-1Wire board.

uVMs using your RS232 multidrop idea seem to be an excellent non-1Wire based
solution to the problem and so I would like to proceed with this strategy


Ted

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RE: [Embedlets-dev] Light Blinker update and uVM serial multidrop network

[James C. <ca...@vi...>]

Hi!

Well.. Here I am at PICMASTERS and might I say it has been a very very
VERY interesting conference for me.

I won't say much more just yet but for those who have been following the
development of the thinking behind my business model.. Well it's looking
good with microchip at this (early) stage ;-)

RS232 Multi-drop for uVM.. 

Great news on this front also.. I demo'd WebServices here at PICMASTERS
for microchip where I showed Remote Mothod Invocation (RMI) from a .NET
Visual Studio C# application to uVM devices over SLIP and discussed the
advantages of the serial multi-drop concept over slip and the advantages
of serial slip from a ethernet/ppp hub. Well this and other technology I
introduced them to has left some people from microchip 'breathless'..
Lots' more to come on this.

So yes.. I am on it on a priority basis anyhow because it looks like I
am doing a full presentation and workshop with microchip in the coming
weeks and demonstrating this 'daisy chaining' webservice connected uVM
devices is high on the list. The one piece of work to get it running on
the JSTamp though is I need to reproduce the '.NET remoting
infrastructure' ie that diagram I produced on the SLIP/JAPL
infrastructure is actually the same sort of thing as the .NET
infrastructure.. I am very keen though to demonstrated platform
independence of the HOST though and have already started on this... So
the answer is yes. Will happen sooner than later.

So much to say..! Stay tuned..

James Caska
www.muvium.com
uVM - 'Java Bred for Embedded'

P.S  Thanks for the comments on the Technology Evaluation Guide.. It was
quite an effort to put all those concepts into a digestable form.


-----Original Message-----
From: emb...@li...
[mailto:emb...@li...] On Behalf Of
Ted Kosan
Sent: Thursday, 17 July 2003 7:27 AM
To: emb...@li...
Subject: [Embedlets-dev] Light Blinker update and uVM serial multidrop
network


Topic tags:[ARCH][JAPL][WIRING][DOCS][MGMT][STRATEGY][NEWBIE]
_______________________________________________

I submitted the Global Light Blinker proposal to the JXTA community and
the feedback that I received on the idea was all +1s so I have been
moving ahead with developing the software.

The next step in the process is to submit the project idea for formal
approval and I will do this as soon as I have a working demonstration.

The demonstration application is currently 90% functional and the main
thing that is preventing 100% functionality is a method in the JXTA core
libraries that has not been implemented yet.  I have been using the JXTA
lists in order to resolve this issue as soon as possible.

In the meantime, I am now ready to start working on the reference
implementation hardware design.



James,

Do you happen to have a diagram of your RS232 serial line multidrop
design?  My initial plan was to go with 1-Wire for the reference
hardware but I am very reluctant to deal with Dallas Semiconductor
directly to obtain serial-to-1Wire converters (DS9097Us) and it looks
like we are about 3 months away from having a second source for an
equivalent serial-to-1Wire board.

uVMs using your RS232 multidrop idea seem to be an excellent non-1Wire
based solution to the problem and so I would like to proceed with this
strategy


Ted

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RE: [Embedlets-dev] SLIP & uVM serial multidrop network

[Ted K. <tk...@ya...>]

James wrote:

> Well.. Here I am at PICMASTERS and might I say it has been a very very
> VERY interesting conference for me.
> 
> I won't say much more just yet but for those who have been following the
> development of the thinking behind my business model.. Well it's looking
> good with microchip at this (early) stage ;-) [...] Well this and other
> technology I introduced them to has left some people from microchip
> 'breathless'...Lots' more to come on this.[snip]

This is absolutely spectacular news James!  I was wondering what MicroChip's
reaction was going to be to what you are doing with uVM but it looks like they
are finally interested in moving forward with these new technologies.  I am
looking forward to hearing more!



> I produced on the SLIP/JAPL
> infrastructure is actually the same sort of thing as the .NET
> infrastructure.. I am very keen though to demonstrated platform
> independence of the HOST though and have already started on this... So
> the answer is yes. Will happen sooner than later.

This is funny because I stumbled across some interesting information while
researching the most efficient way to implement your SLIP based RS232 multidrop
idea in a cross-platform way.  During the past few days I have been looking
very closely at RXTX (which is an open-source version of the javax.comm
communications API, http://www.rxtx.org/) and guess what?  They have already
started putting in support for things like I2C and RS485.  It seems to me that
this would be a good code base to start with in order to build cross-platform
SLIP capabilities on top of.


Anyway, we can talk more about this when you get back.

Ted

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RE: [Embedlets-dev] Light Blinker update and uVM serial multidrop network

[James C. <ca...@vi...>]

Hi Ted, All

The RS232-MultiDrop design is very straight forward. All you need is a
single Maxim device to handle the communications between the PC and the
first element of the chain for the voltage conversion and from there on
it looks quite similar to an I2C or 1-wire pullup configuration.

I have created a partial diagram from virtual breadboard in the Scalar
Vector Graphics output (SVG)

If you haven't already got a viewer for SVG you need to install one

http://www.adobe.com/svg/viewer/install/main.html


To note: 
1) The PIC is just a placeholder to show the connection to TX/RX you
have to change the actual pins according to the actual PIC used
obviously
2) The RX/TX top right connect to the MAXIM device or other RS232 level
shifting device.

The idea is very simple,
We are using a pulldown diode to prevent the discrete PIC's from driving
each others outputs to the wrong levels. This works because the master
will transmit and all will listen but only one device will respond to
any one request (it has a matching IP address) so there is no collision
in the return TX all we need to do is to prevent each device from
effecting the output driver of the other devices which we do with the
diode.

I haven't build one yet.. But when I do I will publish more complete
schematics but if you want to get started early this is what I am
thinking.

James Caska
www.muvium.com
uVM - 'Java Bred for Embedded'




-----Original Message-----
From: emb...@li...
[mailto:emb...@li...] On Behalf Of
Ted Kosan
Sent: Thursday, 17 July 2003 7:27 AM
To: emb...@li...
Subject: [Embedlets-dev] Light Blinker update and uVM serial multidrop
network


Topic tags:[ARCH][JAPL][WIRING][DOCS][MGMT][STRATEGY][NEWBIE]
_______________________________________________

I submitted the Global Light Blinker proposal to the JXTA community and
the feedback that I received on the idea was all +1s so I have been
moving ahead with developing the software.

The next step in the process is to submit the project idea for formal
approval and I will do this as soon as I have a working demonstration.

The demonstration application is currently 90% functional and the main
thing that is preventing 100% functionality is a method in the JXTA core
libraries that has not been implemented yet.  I have been using the JXTA
lists in order to resolve this issue as soon as possible.

In the meantime, I am now ready to start working on the reference
implementation hardware design.



James,

Do you happen to have a diagram of your RS232 serial line multidrop
design?  My initial plan was to go with 1-Wire for the reference
hardware but I am very reluctant to deal with Dallas Semiconductor
directly to obtain serial-to-1Wire converters (DS9097Us) and it looks
like we are about 3 months away from having a second source for an
equivalent serial-to-1Wire board.

uVMs using your RS232 multidrop idea seem to be an excellent non-1Wire
based solution to the problem and so I would like to proceed with this
strategy


Ted

__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com


-------------------------------------------------------
This SF.net email is sponsored by: VM Ware
With VMware you can run multiple operating systems on a single machine.
WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines at the
same time. Free trial click here: http://www.vmware.com/wl/offer/345/0
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