Am 13.07.2010 17:27, schrieb Thomas Jarosch:
> Hello Flynn,
>
> On Saturday, 10. July 2010 17:06:35 Flynn Marquardt wrote:
>
>> I tried to read the chipid in python:
>>
>> import ftdi
>> ftdic = ftdi.ftdi_context()
>> ret = ftdi.ftdi_usb_open(ftdic, 0x0403, 0x6001)
>> chipid = 0
>> ftdi.ftdi_read_chipid(ftdic, chipid)
>>
>> results in a TypeError:
>>
>> TypeError: in method 'ftdi_read_chipid', argument 2 of type 'unsigned
>> int *'
>>
>> Without help from Swig it is not possible to create the correct object.
>>
>> Inserting in bindings/ftdi.i the line
>>
>> %pointer_functions(unsigned int, uintp);
>>
>> after %include "cpointer.i" helps (pointer_class could also be used).
>>
>> With a little modification in python:
>>
>> import ftdi
>> ftdic = ftdi.ftdi_context()
>> ret = ftdi.ftdi_usb_open(ftdic, 0x0403, 0x6001)
>> chipid = ftdi.new_uintp()
>> ftdi.ftdi_read_chipid(ftdic, chipid)
>> hex(ftdi.uintp_value(chipid))
>>
>> the correct chipid is printed.
>>
>> It seems (I'm not an expert in swig), that the *OUTPUT directives are
>> not correct for
>> ftdi_read_chipid, otherwise this patch woud not be needed.
>>
> Thanks for the info. Care to send a proper patch
> as I'm not too familiar with swig?
>
> Cheers,
> Thomas
>
Here it is, it's only a oneliner:
--- libftdi-0.17-orig/bindings/ftdi.i 2009-04-07 18:58:14.000000000 +0200
+++ libftdi-0.17/bindings/ftdi.i 2010-07-10 16:49:35.981446841 +0200
@@ -2,6 +2,8 @@
%module ftdi
%include "typemaps.i"
%include "cpointer.i"
+%pointer_functions(unsigned int, uintp);
+
%typemap(in) unsigned char* = char*;
%ignore ftdi_write_data_async;
%ignore ftdi_async_complete;
and should apply clean also to version 0.18.
Maybe the example code
import ftdi
ftdic = ftdi.ftdi_context()
ret = ftdi.ftdi_usb_open(ftdic, 0x0403, 0x6001)
chipid = ftdi.new_uintp()
ftdi.ftdi_read_chipid(ftdic, chipid)
hex(ftdi.uintp_value(chipid))
should be put in a README, because the method initializing an unsigned int
pointer (chipid = ftdi.new_uintp()) is not very common to python
programmers.
Flynn
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