Populate USB control index with interface number for CDC implementation. #374
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This is necessary for dual UART devices like the Prolific PL2523. For details see wIndex at https://www.beyondlogic.org/usbnutshell/usb6.shtml#SetupPacket and compare to the Linux cdc-acm.c function acm_ctrl_msg.
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This is necessary for dual UART devices like the Prolific PL2523.
For details see wIndex at https://www.beyondlogic.org/usbnutshell/usb6.shtml#SetupPacket and compare to the Linux cdc-acm.c function acm_ctrl_msg.
Tested on PL2523 and STLink V3 board. Hopefully does not break others. If so might consider ability for developer to programmatically set the index to be used.