extended full duplex communication

avionikeren

I want to recieve a string with the propeller and I guess the extended full duplex object would do the job.
But I can`t find out how to do it...

The string is sent from a visual basic program·with rs232. I can·of course change the delimiter,
but I have been using carriage return earlier when the program has communicated with a BS2PX.
I have also added a character in start and end of the string so I can check that the hole string has been recieved.

Is it possible to do the same with a propeller?

String example:

s
101
188
135
054
083
172
003
e

·

Martin Hebel

When you say you can change the delimiter, do you mean on the PC side, or simply in the EXT_FD object?

Instead of delimited, your could simply accept each one at a time:

Repeat                                 ' wait for s
   Start := Ser.RxTime(100)
Loop until start == "s"

val1 := Ser.RxDecTime(100)  ' accept each value
Val2 := Ser.RxDecTime(100)
etc for all values

Stop := Ser.RxTime(100)        ' check for stop
If Stop == "e"
   ....

Not tested!!

-Martin

avionikeren

Thanks a lot, I think this is just what I need!

Yes I ment to change the delimiter on the pc side, but as long as this work with carriage return, it`s· perfect...

avionikeren

I have been searching around and found another similar project and ended up with this code:

PUB main
 dira[noparse][[/noparse]15]~~   
 Serial.start(6,8,0,19200)
 serial.SetDelimiter(",")
 serial.rxflush
 repeat
    repeat while (serial.rx <> "s")
    serial.RxStrTime(1,@dataStr1)       
    serial.RxStrTime(1,@dataStr2)
    serial.RxStrTime(1,@dataStr3)
    serial.RxStrTime(1,@dataStr4)
    serial.RxStrTime(1,@dataStr5)
    serial.RxStrTime(1,@dataStr6)
    serial.RxStrTime(1,@dataStr7)
    serial.RxStrTime(1,@dataStr8)
    serial.RxStrTime(1,@dataStr9)
    serial.RxStrTime(1,@dataStr10) 
    !outa[noparse][[/noparse]15]
    waitcnt(1_000_000 + cnt)

I have added a LED at pin 15 just to see that it runs. but it will only run when the "repeat while" line is removed.
I know that the "s" is transmitted from the computer, because a basic stamp recieves it with no trouble...

What could be wrong?

avionikeren

I have hooked up a computer with hyper terminal and when I send out a character with the propeller,I recieve a different character on the computer. i.e. a "s" becomes a "$" and a "S" becomes a "%", what can that be? the propeller use standard ASCII doesn`t it?

StefanL38

hello avionikeren,

did you check that ALL parameters are correct:
baudrate, databits, stopbits, paritybits ?

did you receive the SAME but wrong characters every time?

if not
is only one method sending out data at the same time?

what is the hardware you are using ? (maybe Problem of voltage-levels, lack of or too small capacitors used with voltagelevelshifter

did you test on the propeller itself with a closed loop (Prop-TX-PIN directly connected to Prop-RX-PIN
and checking the data with TV-object or something like that?

regards

Stefan

avionikeren

yes, I recieve the same but wrong characters every time.

I have·tried all settings on the hyper terminal, but none outputs the correct character.

I do not have the correct resistors to make the TV output.

StefanL38

hello,

PLAYING ARAOUND with the parameters does not lead to the target did you COMPARE every detail
of the parameters between propeller and terminalsoftware ?

ok we'll gonna make another small step

program a loop that starts at value 32 up to 255

send with command .tx(value) and post the result here

another thing is to try another terminalsoftware hyperterminal is quite not comfortable

here is a link for downloading another terminalsoftware

http://forums.parallax.com/forums/default.aspx?f=25&m=169419&p=1&ord=d

avionikeren

thanks a lot for the tip about the terminal program, really nice!!
the problem was that I had to set the mode bit to 3, but I can`t see why?

'' mode bit 0 = invert rx
'' mode bit 1 = invert tx
'' mode bit 2 = open-drain/source tx
'' mode bit 3 = ignore tx echo on rx

Jonathan

If you passed a "3" as a parameter, I think it will translate to %11, which is invert tx/rx

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