Getting a string from a serial line

bazi

I'm trying to modify propcmd to receive a file from my computer and write it to sd-card.

Serial communication works, but i can't figure out how to get a string usable with str-function from FullDuplexSerial and fsrw.popen()

I've tried this, but it does not work:

VAR
  filename[noparse][[/noparse]9]
  ext [noparse][[/noparse] 4]
...
PUB ....
...
  count := 0 ' get 8 bytes filename from host
  repeat while count < 8
    header_filename[noparse][[/noparse]count] := text.rx
    text.tx(header_filename[noparse][[/noparse]count])
    count++
  header_filename[noparse][[/noparse]8] := 0

  count := 0 ' get 3 bytes extension from host
  repeat while count < 3
    header_ext[noparse][[/noparse]count] := text.rx
    text.tx(header_ext[noparse][[/noparse]count])
    count++
  header_ext := 0

  text.str(string("filename: "))
  text.str(filename)
  text.tx(".")
  text.str(ext)

I hope you can help me [noparse]:)[/noparse]

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some say the devil is dead... ...tish army!

pullmoll

bazi said...
I hope you can help me [noparse]:)[/noparse]

Sure. Try text.str(@filename) and text.str(@ext)
Or even better yet use text.str(@header_filename), because that is where you collect the string!?

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Pullmoll's Propeller Projects

Post Edited (pullmoll) : 6/17/2010 3:02:52 PM GMT

StefanL38

like its name says a string is a string of bytes where each byte represents a character
variables in spin can contain a maximum of 4 bytes = 32 bit = 1 long

strings are stored as a bytesequence. Like you do with

  header_filename[noparse][[/noparse]count] := text.rx

How should a 32bit-variable contain 8 characters? Rhetoric question: it's not possible.
So characters are stored as a sequence of bytes and you need to know WHERE this sequence of bytes is located in RAM

That's what the str-method needs. The ADRESS WHERE the bytesequence ist stored.

So you have to code @NameOfVariable like pullmoll sugested.

the @-operator gives back the desired pointer to the RAM-adress of the variable

"MyVariable" evaluates to the value of MyVariable

"@MyVariable" evaluates to the RAM-adress where the value of MyVariable is STORED in RAM

best regards

Stefan

Unsoundcode

That was a simple yet well worded explanation.

TY

Jeff T.