Recieving typed string from PC

Basil · 2008-08-12 21:33

Hi All, [noparse]:)[/noparse]

I have an application where the user needs to typed command an a PC needs to be sent to the prop and acted upon.

I am using simple_serial as I don't need full duplex.

I have it working no problems when using single letter commands, but how do I get the prop to wait until the user presses return ($0D) before acting on the command.

In other words, the command is a string not a single character.

Thanks for the assistance!

Alec

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-Alec

My our page

Erik Friesen · 2008-08-12 22:00

The $ is the parallax way of defining hex. $D is the same as 13. The windows expanded calculator is very handy for this sort of thing. All you have to do is do a

repeat until serial.rx==13
dowhateveryouwant

Basil · 2008-08-12 22:05

Hello [noparse]:)[/noparse]

Yeah, I know the $ = hex thing.

Here is some psuedo code of what I want to do. It doesn't quite work in practice :P

repeat until user_chr == $0D
user_chr = serial.rx
user_str = user_str + user_chr

Thanks for the help [noparse]:)[/noparse]

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-Alec

My our page

Erik Friesen · 2008-08-12 22:35

$orry you already knew. Perhaps the thing to do is shift left and add each character to a long, then compare the long and look for $d in the lower byte?

Basil · 2008-08-12 22:38

Theres an option [noparse]:)[/noparse]

I will try that out, thanks!

Any other suggestions are helpfull

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-Alec

My our page

parts-man73 · 2008-08-12 22:59

I just stumbled upon an object written by Martin Hebel - Extended_FDSerial

RXStr - "Accepts a string of characters - up to 15 - to be passed by reference
String acceptance terminates with a carriage return.
Will accept up to 15 characters before passing back."

seems perfect for your needs

http://forums.parallax.com/showthread.php?p=624624

It also will convert ascii strings of numbers and convert them to a value, both Decimal and Hex.

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Brian

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Basil · 2008-08-12 23:00

Ooo nice [noparse]:)[/noparse] Thanks perfect thanks!

Seems I didn't search hard enough!

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-Alec

My our page

tpw_man · 2008-08-12 23:03

What I use is this handy loop. It assumes echo is not turned on on the serial terminal. Also handles delete. Delete the 'if in == 8' if to disable that. Might have a couple bugs as I copied it from memory.

repeat i from 0 to <max number of chars - 1>
  in := ser.rx
  if in == 13
    input_str[i] := 0
    ser.tx(in)
    quit
  if in == 8
    i--
    ser.tx(in)
    input_str[noparse][[/noparse]i--] := 0
    next
  input_str[i] := in
  ser.tx(in)

[/i][/i]

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I am 1011, so be surprised!

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Basil · 2008-08-12 23:10

Nice and short, thats probably more like what im looking for.

The previously linked solution uses fullduplexserial which resets the prop when USS is not connected so it would probably cause problems.

Thanks for that [noparse]:)[/noparse]

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-Alec

My our page

Recieving typed string from PC

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