Urgently requires help on serial communications
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Posts: 46,084
I'm new with Stamps. My task is to get 7 bits of serial data from SIN
pin(2) from the DB9 of my BS2. After that this serial data will be
output into parallel form, with each bit at its desginated output
pin. This is my code. I'm not sure of the code for getting data from
the SIN. Could anyone help me on it? Thanks.
'{$STAMP BS2}
'{$PORT COM1}
'DirA,B,C,D each declares a group of 4 bits. DirA
encompasses bits 0-3, DirB encompasses bits 4-7.
'DirC encompasses bits 8-11, DirD encompasses bits 12-
15.
setup:
dirA=%1111 'Makes pin0-3 as output
dirB=%0001 'Makes pin4 as output
main:
Do
serin 15, 9600, aByte 'Serial input into 15 at baud 9600
outL=aByte 'Output each bit.
loop
pin(2) from the DB9 of my BS2. After that this serial data will be
output into parallel form, with each bit at its desginated output
pin. This is my code. I'm not sure of the code for getting data from
the SIN. Could anyone help me on it? Thanks.
'{$STAMP BS2}
'{$PORT COM1}
'DirA,B,C,D each declares a group of 4 bits. DirA
encompasses bits 0-3, DirB encompasses bits 4-7.
'DirC encompasses bits 8-11, DirD encompasses bits 12-
15.
setup:
dirA=%1111 'Makes pin0-3 as output
dirB=%0001 'Makes pin4 as output
main:
Do
serin 15, 9600, aByte 'Serial input into 15 at baud 9600
outL=aByte 'Output each bit.
loop
Comments
abyte var byte
and the syntax for the SERIN command requires square brackets around
the data list, and a special code for 9600 baud, and reference to p16
to use the pin 2 serial input::
SERIN 16, $54, [noparse][[/noparse]aByte] 'Serial input into 15 at baud 9600
There is online HELP with the IDE, and the Stamp manual (.pdf) is
available from the Parallax web site.
-- Tracy
>I'm new with Stamps. My task is to get 7 bits of serial data from SIN
>pin(2) from the DB9 of my BS2. After that this serial data will be
>output into parallel form, with each bit at its desginated output
>pin. This is my code. I'm not sure of the code for getting data from
>the SIN. Could anyone help me on it? Thanks.
>
>
>'{$STAMP BS2}
>'{$PORT COM1}
> 'DirA,B,C,D each declares a group of 4 bits. DirA
>encompasses bits 0-3, DirB encompasses bits 4-7.
> 'DirC encompasses bits 8-11, DirD encompasses bits 12-
>15.
>
>setup:
>dirA=%1111 'Makes pin0-3 as output
>dirB=%0001 'Makes pin4 as output
>
>
>main:
>Do
> serin 15, 9600, aByte 'Serial input into 15 at baud 9600
> outL=aByte 'Output each bit.
>loop
on it, so needs 'invert' mode. Thus:
N9600 CON $54 ' 9600 baud selector
I9600 CON N9600 + $4000 ' 'Invert' mode -- WITH driver
AByte VAR BYTE
SERIN 16, I9600, [noparse][[/noparse]AByte]
' Note, program will 'pend' at this entry, until
' a byte is received.
' Note the Stamp does NOT have predefined
' 'baud rate constants' -- you must look up the value
' you want in the table in the manual, and create your
' own 'baud rate constants' out of the entries there.
' Note the Stamp does 8-bit, No parity well, and
' 7-bit, even parity -- but that's it. The default
' is 8-bit, no parity.
--- In basicstamps@yahoogroups.com, Tracy Allen <tracy@e...> wrote:
> That's almost right, but... You need to define the variable
>
> abyte var byte
>
> and the syntax for the SERIN command requires square brackets
around
> the data list, and a special code for 9600 baud, and reference to
p16
> to use the pin 2 serial input::
>
> SERIN 16, $54, [noparse][[/noparse]aByte] 'Serial input into 15 at baud 9600
>
> There is online HELP with the IDE, and the Stamp manual (.pdf) is
> available from the Parallax web site.
>
> -- Tracy
>
>
>
>
> >I'm new with Stamps. My task is to get 7 bits of serial data from
SIN
> >pin(2) from the DB9 of my BS2. After that this serial data will be
> >output into parallel form, with each bit at its desginated output
> >pin. This is my code. I'm not sure of the code for getting data
from
> >the SIN. Could anyone help me on it? Thanks.
> >
> >
> >'{$STAMP BS2}
> >'{$PORT COM1}
> > 'DirA,B,C,D each declares a group of 4 bits. DirA
> >encompasses bits 0-3, DirB encompasses bits 4-7.
> > 'DirC encompasses bits 8-11, DirD encompasses bits 12-
> >15.
> >
> >setup:
> >dirA=%1111 'Makes pin0-3 as output
> >dirB=%0001 'Makes pin4 as output
> >
> >
> >main:
> >Do
> > serin 15, 9600, aByte 'Serial input into 15 at baud 9600
> > outL=aByte 'Output each bit.
> >loop
Port p16 inverts no matter whether you use $54 or $4054! It only
matters if you are using flow control (SEROUT 16\15,...).
Also...
---inverted mode rests low, goes high to send, and needs a pulldown
resistor in open baudmode.
--noninverted mode rests at a high level and goes low to send, and
needs a pullup resistor in open baudmode.
It is the second one, noninverted, $54, you would use if there is
going to be an hardware inverter like the MAX232 in the interface to
a standard RS232 line.
-- Tracy
>Tracy! Almost right -- port 16 has a 232 driver
>on it, so needs 'invert' mode. Thus:
>
>N9600 CON $54 ' 9600 baud selector
>I9600 CON N9600 + $4000 ' 'Invert' mode -- WITH driver
>AByte VAR BYTE
>
>SERIN 16, I9600, [noparse][[/noparse]AByte]
>' Note, program will 'pend' at this entry, until
>' a byte is received.
>
>' Note the Stamp does NOT have predefined
>' 'baud rate constants' -- you must look up the value
>' you want in the table in the manual, and create your
>' own 'baud rate constants' out of the entries there.
>' Note the Stamp does 8-bit, No parity well, and
>' 7-bit, even parity -- but that's it. The default
>' is 8-bit, no parity.
>
>--- In basicstamps@yahoogroups.com, Tracy Allen <tracy@e...> wrote:
>> That's almost right, but... You need to define the variable
>>
>> abyte var byte
>>
>> and the syntax for the SERIN command requires square brackets
>around
>> the data list, and a special code for 9600 baud, and reference to
>p16
>> to use the pin 2 serial input::
>>
>> SERIN 16, $54, [noparse][[/noparse]aByte] 'Serial input into 15 at baud 9600
>>
>> There is online HELP with the IDE, and the Stamp manual (.pdf) is
>> available from the Parallax web site.
>>
>> -- Tracy
>>
>>
>>
>>
>> >I'm new with Stamps. My task is to get 7 bits of serial data from
>SIN
>> >pin(2) from the DB9 of my BS2. After that this serial data will be
>> >output into parallel form, with each bit at its desginated output
>> >pin. This is my code. I'm not sure of the code for getting data
>from
>> >the SIN. Could anyone help me on it? Thanks.
>> >
>> >
>> >'{$STAMP BS2}
>> >'{$PORT COM1}
>> > 'DirA,B,C,D each declares a group of 4 bits. DirA
>> >encompasses bits 0-3, DirB encompasses bits 4-7.
>> > 'DirC encompasses bits 8-11, DirD encompasses bits 12-
>> >15.
>> >
>> >setup:
>> >dirA=%1111 'Makes pin0-3 as output
>> >dirB=%0001 'Makes pin4 as output
>> >
>> >
>> >main:
>> >Do
>> > serin 15, 9600, aByte 'Serial input into 15 at baud 9600
>> > outL=aByte 'Output each bit.
>> >loop
>
>
>To UNSUBSCRIBE, just send mail to:
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>
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Therefore, if you use $54 by itself, you'll be
sending stuff which looks inverted to other
232 receivers -- like your PC. And
vice-versa for receiving FROM your PC.
That's why you have to use '+ $4000', so the
BS2 will properly format the data, so when
it goes through the inverting driver, it
will look proper to your PC's receiver.
These settings are what I use
when using the P16 port. 232 is very
forgiving, but I don't think your PC is
THAT forgiving. I could be mistaken.
If you're talking BS2 to BS2, then as long
as they agree with each other you can use
$54 on both sides.
--- In basicstamps@yahoogroups.com, Tracy Allen <tracy@e...> wrote:
> Hi Allan,
>
> Port p16 inverts no matter whether you use $54 or $4054! It only
> matters if you are using flow control (SEROUT 16\15,...).
>
> Also...
>
> ---inverted mode rests low, goes high to send, and needs a pulldown
> resistor in open baudmode.
>
>
> --noninverted mode rests at a high level and goes low to send, and
> needs a pullup resistor in open baudmode.
>
> It is the second one, noninverted, $54, you would use if there is
> going to be an hardware inverter like the MAX232 in the interface
to
> a standard RS232 line.
>
> -- Tracy
>
>
>
> >Tracy! Almost right -- port 16 has a 232 driver
> >on it, so needs 'invert' mode. Thus:
> >
> >N9600 CON $54 ' 9600 baud selector
> >I9600 CON N9600 + $4000 ' 'Invert' mode -- WITH driver
> >AByte VAR BYTE
> >
> >SERIN 16, I9600, [noparse][[/noparse]AByte]
> >' Note, program will 'pend' at this entry, until
> >' a byte is received.
> >
> >' Note the Stamp does NOT have predefined
> >' 'baud rate constants' -- you must look up the value
> >' you want in the table in the manual, and create your
> >' own 'baud rate constants' out of the entries there.
> >' Note the Stamp does 8-bit, No parity well, and
> >' 7-bit, even parity -- but that's it. The default
> >' is 8-bit, no parity.
> >
> >--- In basicstamps@yahoogroups.com, Tracy Allen <tracy@e...> wrote:
> >> That's almost right, but... You need to define the variable
> >>
> >> abyte var byte
> >>
> >> and the syntax for the SERIN command requires square brackets
> >around
> >> the data list, and a special code for 9600 baud, and reference to
> >p16
> >> to use the pin 2 serial input::
> >>
> >> SERIN 16, $54, [noparse][[/noparse]aByte] 'Serial input into 15 at baud 9600
> >>
> >> There is online HELP with the IDE, and the Stamp manual (.pdf) is
> >> available from the Parallax web site.
> >>
> >> -- Tracy
> >>
> >>
> >>
> >>
> >> >I'm new with Stamps. My task is to get 7 bits of serial data
from
> >SIN
> >> >pin(2) from the DB9 of my BS2. After that this serial data will
be
> >> >output into parallel form, with each bit at its desginated
output
> >> >pin. This is my code. I'm not sure of the code for getting data
> >from
> >> >the SIN. Could anyone help me on it? Thanks.
> >> >
> >> >
> >> >'{$STAMP BS2}
> >> >'{$PORT COM1}
> >> > 'DirA,B,C,D each declares a group of 4 bits. DirA
> >> >encompasses bits 0-3, DirB encompasses bits 4-7.
> >> > 'DirC encompasses bits 8-11, DirD encompasses bits 12-
> >> >15.
> >> >
> >> >setup:
> >> >dirA=%1111 'Makes pin0-3 as output
> >> >dirB=%0001 'Makes pin4 as output
> >> >
> >> >
> >> >main:
> >> >Do
> >> > serin 15, 9600, aByte 'Serial input into 15 at baud 9600
> >> > outL=aByte 'Output each bit.
> >> >loop
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the
> >Subject and Body of the message will be ignored.
> >
> >
> >Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
user right?
N9600 CON $54, N9600 =no parity bit, CON=assign with,
$54= ???? Anyone can enlighten me?
What about I9600 CON N9600? I can't find what it
means.
AByte VAR BYTE, this statement ALONE will
automatically receive data from an input X right? I
know it can only hold 8 bits of data. Am I right?
Sorry for the trouble. Thanks
--- Allan Lane <allan.lane@h...> wrote:
> Tracy! Almost right -- port 16 has a 232 driver
> on it, so needs 'invert' mode. Thus:
>
> N9600 CON $54 ' 9600 baud selector
> I9600 CON N9600 + $4000 ' 'Invert' mode -- WITH
> driver
> AByte VAR BYTE
>
> SERIN 16, I9600, [noparse][[/noparse]AByte]
> ' Note, program will 'pend' at this entry, until
> ' a byte is received.
>
> ' Note the Stamp does NOT have predefined
> ' 'baud rate constants' -- you must look up the
> value
> ' you want in the table in the manual, and create
> your
> ' own 'baud rate constants' out of the entries
> there.
> ' Note the Stamp does 8-bit, No parity well, and
> ' 7-bit, even parity -- but that's it. The default
> ' is 8-bit, no parity.
>
> --- In basicstamps@yahoogroups.com, Tracy Allen
> <tracy@e...> wrote:
> > That's almost right, but... You need to define
> the variable
> >
> > abyte var byte
> >
> > and the syntax for the SERIN command requires
> square brackets
> around
> > the data list, and a special code for 9600 baud,
> and reference to
> p16
> > to use the pin 2 serial input::
> >
> > SERIN 16, $54, [noparse][[/noparse]aByte] 'Serial input into 15 at
> baud 9600
> >
> > There is online HELP with the IDE, and the Stamp
> manual (.pdf) is
> > available from the Parallax web site.
> >
> > -- Tracy
> >
> >
> >
> >
> > >I'm new with Stamps. My task is to get 7 bits of
> serial data from
> SIN
> > >pin(2) from the DB9 of my BS2. After that this
> serial data will be
> > >output into parallel form, with each bit at its
> desginated output
> > >pin. This is my code. I'm not sure of the code
> for getting data
> from
> > >the SIN. Could anyone help me on it? Thanks.
> > >
> > >
> > >'{$STAMP BS2}
> > >'{$PORT COM1}
> > > 'DirA,B,C,D each declares a group of 4 bits.
> DirA
> > >encompasses bits 0-3, DirB encompasses bits 4-7.
> > > 'DirC encompasses bits 8-11, DirD encompasses
> bits 12-
> > >15.
> > >
> > >setup:
> > >dirA=%1111 'Makes pin0-3 as output
> > >dirB=%0001 'Makes pin4 as output
> > >
> > >
> > >main:
> > >Do
> > > serin 15, 9600, aByte 'Serial input into 15 at
> baud 9600
> > > outL=aByte 'Output each bit.
> > >loop
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject and Body of the message will be
> ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
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at the same time.
The SERIN command is "SERIN 16, MyBaud, [noparse][[/noparse]MyByteVar]"
1. The 'MyBaud' parameter is a baud rate divisor.
See the Stamp manual 2.0c page 297 for a table of
baud rate divisors.
2. N9600 CON $54 (OR, N9600 CON 84)
This creates a 'CONstant' which is replaced at
compile time with the value. In this case,
replaced with the 'baud rate divisor' of
84 decimal, or $54 hexadecimal. This is the
baud rate devisor of 9600 Baud for the BS2 and BS2e.
3. I9600 CON N9600 + $4000
This creates another 'constant' "I9600", which
is replaced at runtime with the value $4054 hex, or
16468 decimal. This value is the 'inverted' baud
rate selector. 'Inverted' here is the BS2 term
meaning "I have a 232 driver in circuit".
Port 16 leads to the DB-9 connector to your PC,
and HAS a 232 driver in circuit. If you used
any other pin, you would need to add a 232 driver
circuit (like a MAXIM-IC MAX232 chip) to get the
232 levels. See other posts.
4. SERIN receives data a BYTE at a time. There
are MANY ways to put this byte into variables.
See Manual 2.0c, pages 278 through 292. In the
example, I merely put one byte directly into
a BYTE variable, for your use later in the
program.
If you want something simple that works:
MyByte VAR BYTE ' Declare 'MyByte' as a VARiable
MAIN:
SERIN 16, 16468, [noparse][[/noparse]MyByte] '
SEROUT 16, 16468, [noparse][[/noparse]DEC MyByte]
GOTO MAIN
' The additional 'CON' I define make changing the
' baud rates in the future much easier.
--- In basicstamps@yahoogroups.com, Stanley Wong <barangsg@y...>
wrote:
> The SERIN X, X can be any input pins declare by the
> user right?
>
> N9600 CON $54, N9600 =no parity bit, CON=assign with,
> $54= ???? Anyone can enlighten me?
>
> What about I9600 CON N9600? I can't find what it
> means.
>
> AByte VAR BYTE, this statement ALONE will
> automatically receive data from an input X right? I
> know it can only hold 8 bits of data. Am I right?
>
> Sorry for the trouble. Thanks
>
>
>
>
>
>
> --- Allan Lane <allan.lane@h...> wrote:
> > Tracy! Almost right -- port 16 has a 232 driver
> > on it, so needs 'invert' mode. Thus:
> >
> > N9600 CON $54 ' 9600 baud selector
> > I9600 CON N9600 + $4000 ' 'Invert' mode -- WITH
> > driver
> > AByte VAR BYTE
> >
> > SERIN 16, I9600, [noparse][[/noparse]AByte]
> > ' Note, program will 'pend' at this entry, until
> > ' a byte is received.
> >
> > ' Note the Stamp does NOT have predefined
> > ' 'baud rate constants' -- you must look up the
> > value
> > ' you want in the table in the manual, and create
> > your
> > ' own 'baud rate constants' out of the entries
> > there.
> > ' Note the Stamp does 8-bit, No parity well, and
> > ' 7-bit, even parity -- but that's it. The default
> > ' is 8-bit, no parity.
> >
> > --- In basicstamps@yahoogroups.com, Tracy Allen
> > <tracy@e...> wrote:
> > > That's almost right, but... You need to define
> > the variable
> > >
> > > abyte var byte
> > >
> > > and the syntax for the SERIN command requires
> > square brackets
> > around
> > > the data list, and a special code for 9600 baud,
> > and reference to
> > p16
> > > to use the pin 2 serial input::
> > >
> > > SERIN 16, $54, [noparse][[/noparse]aByte] 'Serial input into 15 at
> > baud 9600
> > >
> > > There is online HELP with the IDE, and the Stamp
> > manual (.pdf) is
> > > available from the Parallax web site.
> > >
> > > -- Tracy
> > >
> > >
> > >
> > >
> > > >I'm new with Stamps. My task is to get 7 bits of
> > serial data from
> > SIN
> > > >pin(2) from the DB9 of my BS2. After that this
> > serial data will be
> > > >output into parallel form, with each bit at its
> > desginated output
> > > >pin. This is my code. I'm not sure of the code
> > for getting data
> > from
> > > >the SIN. Could anyone help me on it? Thanks.
> > > >
> > > >
> > > >'{$STAMP BS2}
> > > >'{$PORT COM1}
> > > > 'DirA,B,C,D each declares a group of 4 bits.
> > DirA
> > > >encompasses bits 0-3, DirB encompasses bits 4-7.
> > > > 'DirC encompasses bits 8-11, DirD encompasses
> > bits 12-
> > > >15.
> > > >
> > > >setup:
> > > >dirA=%1111 'Makes pin0-3 as output
> > > >dirB=%0001 'Makes pin4 as output
> > > >
> > > >
> > > >main:
> > > >Do
> > > > serin 15, 9600, aByte 'Serial input into 15 at
> > baud 9600
> > > > outL=aByte 'Output each bit.
> > > >loop
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed.
> > Text in the Subject and Body of the message will be
> > ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
>
> __________________________________________________
> Do You Yahoo!?
> Play now and stand a chance to win cash prizes!
> http://yahoo.com.sg/millionaire