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Re: python ftdi.read_data Lazarus Longitudis Thu Feb 02 11:04:16 2012

Hi,

Sorry, stupid typo - I meant there is NO new_charp() in the git code.
How is it meant to be used on the git code?

best regards,
Lazarus

-------- Original-Nachricht --------
> Datum: Fri, 20 Jan 2012 16:53:53 +0100
> Von: "Lazarus Longitudis" <[EMAIL PROTECTED]>
> An: [EMAIL PROTECTED]
> Betreff: Re: python ftdi.read_data

> Hi,
> 
> On the git code there is now new_charp() python method - at least in the
> wrapper which got generated on my system.
> 
> Inside the complete.py example there is no read at all neither a read_pins
> nor a read_data.
> 
> On 0.19 there is a new_charp which is OK, but on 0.19 I get an
> usb_bulk_write error -2 on ftdi.ftdi_write_data
> 
> So either code base I try I am a little bit stuck....
> 
> 
> -------- Original-Nachricht --------
> > Datum: Thu, 19 Jan 2012 14:07:33 -0700
> > Von: Chris Zeh <[EMAIL PROTECTED]>
> > An: [EMAIL PROTECTED]
> > Betreff: Re: python ftdi.read_data
> 
> > Hi Lazarus,
> > 
> > It's been awhile since I've worked with the libftdi library using
> > Python, and I think there might have been some SWIG changes since last
> > I used it, but have a look at this message from the mailinglist:
> >
> http://developer.intra2net.com/mailarchive/html/libftdi/2011/msg00154.html
> > 
> > At that time, you were required to create a pointer wrapper in order
> > to do reads from the device, like so:
> > #Read the Pins (Bitbang mode)
> > pins = ftdi.new_charp()
> > ret = ftdi.ftdi_read_pins(ftdic,pins)
> > print ftdi.charp_value(pins)
> > 
> > I vaguely remember seeing a message from someone who really knew SWIG
> > well and may have revamped the Python stuff. So, hope that helps, but
> > it may be completely irrelevant at this time :-)
> > 
> > 
> > Best regards,
> > Chris
> > 
> > 
> > 
> > 
> > On Thu, Jan 19, 2012 at 1:54 PM, Lazarus Longitudis
> <[EMAIL PROTECTED]>
> > wrote:
> > >  Hi,
> > >
> > >  Maybee I call the function wrong.
> > >  Anyone with an example - the python examples do not include a
> read...
> > >  If I do:
> > >  new_data =3D ftdi.read_data(ftdic, wrote)
> > >  I get a seg fault....
> > >
> > >
> > >  best regards,
> > >  Lazarus
> > > -------- Original-Nachricht --------
> > >> Datum: Wed, 18 Jan 2012 14:05:36 +0100
> > >> Von: "Lazarus Longitudis" <[EMAIL PROTECTED]>
> > >> An: [EMAIL PROTECTED]
> > >> Betreff: python ftdi.read_data
> > >
> > >>
> > >>  Hi,
> > >>
> > >>  I am working with the current git code.
> > >>  Was trying to use the python wrapper, it works mostly but the
> > >> ftdi.read_data call seems to be messed up.
> > >>
> > >>  Python says the function requires only two arguments, the context
> and
> > an
> > >> integer, obviously the target buffer pointer is missing.
> > >>
> > >>  I have compared the swig generated ftdi_wrap.c against 0.19 and it
> is
> > >> clear to see that the parameter parsing is broken here.
> > >>
> > >>  any ideas?
> > >>
> > >>  0.19:
> > >>    if (!PyArg_ParseTuple(args,(char
> > >> *)"OOO:ftdi_read_data",&obj0,&obj1,&obj2)) SWIG_fail;
> > >>    res1 = SWIG_ConvertPtr(obj0, &argp1,SWIGTYPE_p_ftdi_context, 0 |
> >  0 );
> > >>    if (!SWIG_IsOK(res1)) {
> > >>      SWIG_exception_fail(SWIG_ArgError(res1), "in method '"
> > >> "ftdi_read_data" "', argument " "1"" of type '" "struct ftdi_context
> > *""'");
> > >>    }
> > >>    arg1 = (struct ftdi_context *)(argp1);
> > >>    res2 = SWIG_AsCharPtrAndSize(obj1, &buf2, NULL, &alloc2);
> > >>    if (!SWIG_IsOK(res2)) {
> > >>      SWIG_exception_fail(SWIG_ArgError(res2), "in method '"
> > >> "ftdi_read_data" "', argument " "2"" of type '" "unsigned char
> *""'");
> > >>    }
> > >>    arg2 = (unsigned char *)(buf2);
> > >>    ecode3 = SWIG_AsVal_int(obj2, &val3);
> > >>    if (!SWIG_IsOK(ecode3)) {
> > >>      SWIG_exception_fail(SWIG_ArgError(ecode3), "in method '"
> > >> "ftdi_read_data" "', argument " "3"" of type '" "int""'");
> > >>    }
> > >>    arg3 = (int)(val3);
> > >>    result = (int)ftdi_read_data(arg1,arg2,arg3);
> > >>    resultobj = SWIG_From_int((int)(result));
> > >>    return resultobj;
> > >>
> > >>  git:
> > >>    arg2 = &temp2;
> > >>    if (!PyArg_ParseTuple(args,(char *)"OO:read_data",&obj0,&obj1))
> > >> SWIG_fail;
> > >>    res1 = SWIG_ConvertPtr(obj0, &argp1,SWIGTYPE_p_ftdi_context, 0 |
> >  0 );
> > >>    if (!SWIG_IsOK(res1)) {
> > >>      SWIG_exception_fail(SWIG_ArgError(res1), "in method '"
> > "read_data"
> > >> "', argument " "1"" of type '" "struct ftdi_context *""'");
> > >>    }
> > >>    arg1 = (struct ftdi_context *)(argp1);
> > >>    ecode3 = SWIG_AsVal_int(obj1, &val3);
> > >>    if (!SWIG_IsOK(ecode3)) {
> > >>      SWIG_exception_fail(SWIG_ArgError(ecode3), "in method '"
> > "read_data"
> > >> "', argument " "3"" of type '" "int""'");
> > >>    }
> > >>    arg3 = (int)(val3);
> > >>    result = (int)ftdi_read_data(arg1,arg2,arg3);
> > >>    resultobj = SWIG_From_int((int)(result));
> > >>    if (SWIG_IsTmpObj(res2)) {
> > >>      resultobj = SWIG_Python_AppendOutput(resultobj,
> > >> SWIG_From_char((*arg2)));
> > >>    } else {
> > >>      int new_flags = SWIG_IsNewObj(res2) ? (SWIG_POINTER_OWN |  0
> )
> > :  0 ;
> > >>      resultobj = SWIG_Python_AppendOutput(resultobj,
> > >> SWIG_NewPointerObj((void*)(arg2), SWIGTYPE_p_unsigned_char,
> > new_flags));
> > >>    }
> > >>    return resultobj;
> > >>  fail:
> > >>
> > >> --
> > >> Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
> > >> belohnen Sie mit bis zu 50,- Euro!
> https://freundschaftswerbung.gmx.de
> > >>
> > >> --
> > >> libftdi - see http://www.intra2net.com/en/developer/libftdi for
> > details.
> > >> To unsubscribe send a mail to
> > [EMAIL PROTECTED]
> > >>
> > >>
> > >
> > > --
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> > 
> 
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