Problem with serial comms with the PC

Archiver

Jimmy-

There's a hardware-based loopback circuit on all BS2* Stamps that
results in all data received by SIN being echoed back on SOUT. This
is not a configurable option--your PC software must expect it and
deal with it. That's why you are seeing your first 123 from the PC
going back to the PC.

You're not seeing your second "received" because the first time you
go to doStuff your program stops after the debug statement, because
no instruction follows that statement. The hardware loopback is
still working but the program is complete. Hence you see the next
123 echoed back to the PC but your program didn't see it or respond
to it.

Regards,

Steve

Archiver

G'day,

I'm running a BS2-Sx on a basic stamp super carrier board.
I've got some Basic Stamp code like so:

{$STAMP BS2sx}
i var byte
serin 16, 16624, [noparse][[/noparse]dec i]
if i = 123 then goto doStuff
serin 16, 16624, [noparse][[/noparse]dec i]
if i = 123 then goto doStuff
END

doStuff:
debug "received", CR


I've got a VB program that sends the string 123! to the stamp, reads
a value from the stamp, sends 123! again and reads the final value.

I get the following strange output (in VB):
123!
received
123!

ie It echoes what I send to the stamp and doesn't print the second
received. Does anyone know how to get the second received printed?
What am I doing wrong ?


Thanks heaps,

Jimmy

Archiver

I don't think your program ever got back to the second serin. You need to
add a goto statement after the debug statement.

Also, I think that because you are using pin 16, which I understand is the
same pin used for programming, that is the reason for the echo. At least
others have experienced similar problems. You might want to search the
archives for "echo" and see if that solves your problem. The solution might
be as simple as changing your serin pin to another pin.

---

Original Message

---

From: jamesryfler [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=U2zVCDYES1yz1P07bSV4MG7MovHTu_ClXBrq3wCGDuNr5mVJJ1ZSBvLyC7KtIKP1R-suk34Mh4HyJnrjJeKwoa0]jamesryfler@y...[/url
Sent: Tuesday, October 01, 2002 8:41 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Problem with serial comms with the PC


G'day,

I'm running a BS2-Sx on a basic stamp super carrier board.
I've got some Basic Stamp code like so:

{$STAMP BS2sx}
i var byte
serin 16, 16624, [noparse][[/noparse]dec i]
if i = 123 then goto doStuff
serin 16, 16624, [noparse][[/noparse]dec i]
if i = 123 then goto doStuff
END

doStuff:
debug "received", CR


I've got a VB program that sends the string 123! to the stamp, reads
a value from the stamp, sends 123! again and reads the final value.

I get the following strange output (in VB):
123!
received
123!

ie It echoes what I send to the stamp and doesn't print the second
received. Does anyone know how to get the second received printed?
What am I doing wrong ?


Thanks heaps,

Jimmy






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