serial COM Matlab

Archiver

I've got the Matlab code working.
For future reference to anyone that might find it useful, Matlab R12
has a bug in it. All serial objects must be created and opened from
the matlab installation work directory. Matlab R13 fixes this bug.

Now the problem I have is that I have to send my command on two
separate lines.

fprintf(s1, 'cmd:')
fprintf(s1, '0')
or
fprintf(s1, 'cmd:')
fprintf(s1, '1')

why can't I just do -

fprintf(s1, 'cmd:1')
or
fprintf(s1, 'cmd:0')

Is there someway I can force it to process the data sent at the same
time as the wait string?

thanks for the help Stamp folk!




' {$STAMP BS2 }


PIN_CMD VAR BIT


Again:
TOGGLE 10
SERIN 16, 16468, [noparse][[/noparse]WAIT("cmd:"), DEC PIN_CMD]

IF PIN_CMD = 1 THEN TurnOn
IF PIN_CMD = 0 THEN TurnOff
GOTO Again


TurnOn:
HIGH 0
DEBUG CLS, BIN1 IN0
GOTO Again


TurnOff:
LOW 0
DEBUG CLS, BIN1 IN0
GOTO Again

Archiver

Hi Nigel

I believe the reason for you problem ist that the serin modifiers such as
WAIT and DEC
consume to much time to sync up with the data stream - you subsequently
divided your stream in a part
for the WAIT modifier and a second part for the DEC modifier - the fact that
this works is a strong
hint to me that it is a serin modifier timing problem. One way to follow is
to stick with that solution
an to devide your data stream that satifies the time demands of the serin
modifiers. An other way
is to change the stamp code and avoid serin modifiers. BTW. the stamp manual
and other resources
on stamp serial communication disencurrage the deliberate use of serin
modifiers and recommend
to reduce it to a single WAIT and subsequent STR. The fastest is a STR only.
My experience
is that a (single byte) WAIT, followed by a multibyte STR works well and
reliable up to 9600bps.
Of course the situation improves also at lower bitrates.

Hope this helps.

Regards
Adrian

---

Original Message

---

From: "Nigel" <kailar88@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, November 28, 2002 10:08 PM
Subject: [noparse][[/noparse]basicstamps] serial COM Matlab


> Now the problem I have is that I have to send my command on two
> separate lines.
>
> fprintf(s1, 'cmd:')
> fprintf(s1, '0')
> or
> fprintf(s1, 'cmd:')
> fprintf(s1, '1')
>
> why can't I just do -
>
> fprintf(s1, 'cmd:1')
> or
> fprintf(s1, 'cmd:0')
>
> Is there someway I can force it to process the data sent at the same
> time as the wait string?
>
> thanks for the help Stamp folk!
>
>
>
>
> ' {$STAMP BS2 }
>
>
> PIN_CMD VAR BIT
>
>
> Again:
> TOGGLE 10
> SERIN 16, 16468, [noparse][[/noparse]WAIT("cmd:"), DEC PIN_CMD]
>
> IF PIN_CMD = 1 THEN TurnOn
> IF PIN_CMD = 0 THEN TurnOff
> GOTO Again
>
>
> TurnOn:
> HIGH 0
> DEBUG CLS, BIN1 IN0
> GOTO Again
>
>
> TurnOff:
> LOW 0
> DEBUG CLS, BIN1 IN0
> GOTO Again
>