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rene-aguirre / pywinusb

USB / HID windows helper library
BSD 3-Clause "New" or "Revised" License
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sending output report #47

Closed mfriedmann2 closed 6 years ago

mfriedmann2 commented 6 years ago

Hello I am new to HID Communication Protocols and I only had previous I2C protocol experience and I am having some difficulties with just sending simple hexadecimals patches and receiving them with fixed length of bytes (raw_data).

I want to send the fixed length of 7 bytes to the device and I am receiving an error since the parameter in the send_output_report is not correct. Ithink it may be due to the data type. It must be sent in hexadecimals values.. what should I do to solve this issue?

This is the code I've got:

filter = hid.HidDeviceFilter(vendor_id = 0x1234, product_id = 0x4321)
dev = filter.get_devices()
aqm=dev[0]
aqm.open()
buffer = [(c_ubyte(), 0xD3), (c_ubyte(),0x3D), (c_ubyte(), 0x07), (c_ubyte(),0x03), (c_ubyte(),0x00), (c_ubyte(),0xE2), (c_ubyte(),0x2E)]
print(buffer)
print(int(aqm.hid_handle))
#aqm.send_output_report(buffer)
aqm.close()
mcuee commented 6 years ago

Ref: this may help you. https://sourceforge.net/p/pyusb/mailman/message/31188626/

rene-aguirre commented 6 years ago

This is no a library bug. :-)

As the page you pointed out suggest, try to be more familiar with USB HID.

It must be sent in hexadecimals values.. That's how reports work.

Other possibility is that the data might be required to be sent in a feature report.

If you have a vendor app working, try to set a USB filter to know the reports you need to send.