libftdi Archives

Subject: RE: python ftdi.read_data

From: xantares 09 <xantares09@xxxxxxxxxxx>
To: <libftdi@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 23 Jan 2012 07:14:30 +0000


> Date: Fri, 20 Jan 2012 16:59:03 +0100
> From: Lazarus-Long@xxxxxx
> Subject: Re: python ftdi.read_data
> To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx; libftdi@xxxxxxxxxxxxxxxxxxxxxxx
>
> 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" <Lazarus-Long@xxxxxx>
> > An: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
> > 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 <chris.w.zeh@xxxxxxxxx>
> > > An: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
> > > 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
> > <Lazarus-Long@xxxxxx>
> > > 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" <Lazarus-Long@xxxxxx>
> > > >> An: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
> > > >> 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:
> > > >>
> > > >> --
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> > > >>
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Hi,

Here is the patch to wrap correctly read_data from python.
Keep me posted.

M.




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