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Re: python ftdi.read_data Lazarus Longitudis Thu Feb 02 11:04:15 2012

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]
> >>
> >>
> >
> > --
> > 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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