UART Code example, and 8 x 8 switch example

Started by Alan Marconett September 30, 2005
Hi to the list,

I'm forwarding a message that I received. I had some ideas, but I wonder if
we could get a reply from one of the many knowledgeable members of this
list. It's an interesting application.

As many might have surmised, we are both Amateur Radio Operators. Kinda
like a big brotherhood!

Thanks,

Alan KM6VV > Hello ALan,
> I've been trying to post a message and contact the moderator for this
> group without success. I'm hoping the moderator is watching emails
> (although I don't know why he's not seeing mine), so if you would post
> a message that I need some help ("w3nj"), I'd appreacite it.
>
> By the way, the message I've been trying to post has to do with
> www.qsl.net/ka2pyj/serialschematic.htm. I'd like to know if there are
> any code examples for a UART and 8 x8 switch that could be used for
> this circuit. If you wouldn't mind posting this message in the short
> term, I'd also appreaciate it (I can read the group responses, just
> can't send)
>
> tnx es 73
>
> Bruce -W3NJ




Sorry. From your schematic and your request, I do not have a clue what
you are doing, or asking for. :-( Am I missing something obvious?

Chad

--- Alan Marconett <KM6VV@KM6V...> wrote:

> Hi to the list,
>
> I'm forwarding a message that I received. I had some ideas, but I
> wonder if
> we could get a reply from one of the many knowledgeable members of
> this
> list. It's an interesting application.
>
> As many might have surmised, we are both Amateur Radio Operators.
> Kinda
> like a big brotherhood!
>
> Thanks,
>
> Alan KM6VV > > Hello ALan,
> > I've been trying to post a message and contact the moderator for
> this
> > group without success. I'm hoping the moderator is watching emails
> > (although I don't know why he's not seeing mine), so if you would
> post
> > a message that I need some help ("w3nj"), I'd appreacite it.
> >
> > By the way, the message I've been trying to post has to do with
> > www.qsl.net/ka2pyj/serialschematic.htm. I'd like to know if there
> are
> > any code examples for a UART and 8 x8 switch that could be used for
> > this circuit. If you wouldn't mind posting this message in the
> short
> > term, I'd also appreaciate it (I can read the group responses, just
> > can't send)
> >
> > tnx es 73
> >
> > Bruce -W3NJ


My software has no bugs, only undocumented features.



Hi Chad,

I'm thinking he wants to substitute a PIC (16C7X?), write a software UART if
the PIC doesn't have one, and drive a CMOS cross-point switch of some sort.

Perhaps after he's no longer moderated, he can supply a little more info.

Alan KM6VV > -----Original Message-----
> From: piclist@picl... [mailto:piclist@picl...] On Behalf
> Of Chad Russel
> Sent: Friday, September 30, 2005 9:39 AM
> To: piclist@picl...
> Subject: Re: [piclist] UART Code example, and 8 x 8 switch example
>
> Sorry. From your schematic and your request, I do not have a clue what
> you are doing, or asking for. :-( Am I missing something obvious?
>
> Chad
>
> --- Alan Marconett <KM6VV@KM6V...> wrote:
>
> > Hi to the list,
> >
> > I'm forwarding a message that I received. I had some ideas, but I
> > wonder if
> > we could get a reply from one of the many knowledgeable members of
> > this
> > list. It's an interesting application.
> >
> > As many might have surmised, we are both Amateur Radio Operators.
> > Kinda
> > like a big brotherhood!
> >
> > Thanks,
> >
> > Alan KM6VV
> >
> >
> > > Hello ALan,
> > > I've been trying to post a message and contact the moderator for
> > this
> > > group without success. I'm hoping the moderator is watching emails
> > > (although I don't know why he's not seeing mine), so if you would
> > post
> > > a message that I need some help ("w3nj"), I'd appreacite it.
> > >
> > > By the way, the message I've been trying to post has to do with
> > > www.qsl.net/ka2pyj/serialschematic.htm. I'd like to know if there
> > are
> > > any code examples for a UART and 8 x8 switch that could be used for
> > > this circuit. If you wouldn't mind posting this message in the
> > short
> > > term, I'd also appreaciate it (I can read the group responses, just
> > > can't send)
> > >
> > > tnx es 73
> > >
> > > Bruce -W3NJ
> >


Chad Russel wrote:

> Sorry. From your schematic and your request, I do not have a clue what
> you are doing, or asking for. :-( Am I missing something obvious?
>
> Chad

Yeah.
We're supposed to be mind readers.

Looking at the schematic, it would appear that he
wants to extend the existing schematic to handle an 8x8
matrix instead of the 5 x 8 shown.

I'd use a pair of 4051's and not bother with data/strobe
or the diodes.
3 bits off the UART for X side 4051, 3 for Y side 4051
and an enable to both 4051s for the 'close button' command.
And just to be idiot proof, you tie the "common" on the 4051's
together. Gives you a 100 ohm switch if the 4051s have 12V
power. Couldn't be simpler.

Looking at the schematic, what sane person reverses
bit order when connecting data busses? (UART to demux).
What a PITA to program.

Robert.

>
> --- Alan Marconett <KM6VV@KM6V...> wrote: >>Hi to the list,
>>
>>I'm forwarding a message that I received. I had some ideas, but I
>>wonder if
>>we could get a reply from one of the many knowledgeable members of
>>this
>>list. It's an interesting application.
>>
>>As many might have surmised, we are both Amateur Radio Operators.
>>Kinda
>>like a big brotherhood!
>>
>>Thanks,
>>
>>Alan KM6VV
>>
>>
>>
>>>Hello ALan,
>>>I've been trying to post a message and contact the moderator for
>>
>>this
>>
>>>group without success. I'm hoping the moderator is watching emails
>>>(although I don't know why he's not seeing mine), so if you would
>>
>>post
>>
>>>a message that I need some help ("w3nj"), I'd appreacite it.
>>>
>>>By the way, the message I've been trying to post has to do with
>>>www.qsl.net/ka2pyj/serialschematic.htm. I'd like to know if there
>>
>>are
>>
>>>any code examples for a UART and 8 x8 switch that could be used for
>>>this circuit. If you wouldn't mind posting this message in the
>>
>>short
>>
>>>term, I'd also appreaciate it (I can read the group responses, just
>>>can't send)
>>>
>>>tnx es 73
>>>
>>>Bruce -W3NJ
>>
> > My software has no bugs, only undocumented features.




Ok. I think I have a handle, you need an 8 X 8 matrix decoder. From
what I saw about this, I think obsolete part, it is an 8 X 8 matrix
decoder. Quite a bit different than an 8 X 8 serial crosspoint switch
I was thinking was needed. There is a company big in this, but I am
not sure of which.

Chad

--- Robert Rolf <robert.rolf@robe...> wrote:

> Chad Russel wrote:
>
> > Sorry. From your schematic and your request, I do not have a clue
> what
> > you are doing, or asking for. :-( Am I missing something obvious?
> >
> > Chad
>
> Yeah.
> We're supposed to be mind readers.
>
> Looking at the schematic, it would appear that he
> wants to extend the existing schematic to handle an 8x8
> matrix instead of the 5 x 8 shown.
>
> I'd use a pair of 4051's and not bother with data/strobe
> or the diodes.
> 3 bits off the UART for X side 4051, 3 for Y side 4051
> and an enable to both 4051s for the 'close button' command.
> And just to be idiot proof, you tie the "common" on the 4051's
> together. Gives you a 100 ohm switch if the 4051s have 12V
> power. Couldn't be simpler.
>
> Looking at the schematic, what sane person reverses
> bit order when connecting data busses? (UART to demux).
> What a PITA to program.
>
> Robert.
>
> >
> > --- Alan Marconett <KM6VV@KM6V...> wrote:
> >
> >
> >>Hi to the list,
> >>
> >>I'm forwarding a message that I received. I had some ideas, but I
> >>wonder if
> >>we could get a reply from one of the many knowledgeable members of
> >>this
> >>list. It's an interesting application.
> >>
> >>As many might have surmised, we are both Amateur Radio Operators.
> >>Kinda
> >>like a big brotherhood!
> >>
> >>Thanks,
> >>
> >>Alan KM6VV
> >>
> >>
> >>
> >>>Hello ALan,
> >>>I've been trying to post a message and contact the moderator for
> >>
> >>this
> >>
> >>>group without success. I'm hoping the moderator is watching emails
> >>>(although I don't know why he's not seeing mine), so if you would
> >>
> >>post
> >>
> >>>a message that I need some help ("w3nj"), I'd appreacite it.
> >>>
> >>>By the way, the message I've been trying to post has to do with
> >>>www.qsl.net/ka2pyj/serialschematic.htm. I'd like to know if there
> >>
> >>are
> >>
> >>>any code examples for a UART and 8 x8 switch that could be used
> for
> >>>this circuit. If you wouldn't mind posting this message in the
> >>
> >>short
> >>
> >>>term, I'd also appreaciate it (I can read the group responses,
> just
> >>>can't send)
> >>>
> >>>tnx es 73
> >>>
> >>>Bruce -W3NJ
> >>
> >>
> >
> >
> > My software has no bugs, only undocumented features.


My software has no bugs, only undocumented features.