2012/7/19 Debapratim Ghosh <deba21pra...@gmail.com>:
> Hi
>
> My UI in python is successfully able to set configuration of the USB device.
> So now I'm trying to write data to the USB device. I'm setting configuration
> 3, Using endpoint OUT address 0x01 of interface number 0.
> I've written the following code snippet in python.
>
> pingu = usb.core.find(idVendor = 0x04D8, idProduct = 0xFEAA)
> if pingu is not None:
> self.label_3.SetLabel("PIC18F4550 Device Found.")
> #USB Routine starts here
> pingu.set_configuration(3)
> pingu.write(1, 'D', 0)
>
> On the UI side there are no errors. On the USB target PIC 18F4550, I've
> written a C code that lights an LED when a USB data is received, and then I
> check if 'D' is received or not. The target LED glows, indicating that
> something is received in the USB endpoint but the comparison shows not
> equal. What could be wrong? Anything with the character format in python or
> C? Both follow ASCII right?
>
Python 2 or Python 3? In Python 3, strings a unicode by default...
If might want to check the return value of write method so you can
figure out how many bytes were sent to the device...
--
Best Regards,
Wander Lairson Costa
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