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STM32F469I as USB Host communicating with modem

Posted on March 16, 2017 at 10:00

Hi.

I've got external modem that enumerates 6 virtual com ports and only one of those are available for AT commands. I've looked at the examples and the libraries and I do not quite get how to choose the com port that I might communicate. The CDC_standalone example just establishes the communication with the device, but there's no selection or anything.

Is there any examples or documentation how to enumerate the different endpoints?

2 REPLIES 2
Posted on March 16, 2017 at 13:29

After digging the CDC_standalone for a while, found the iteration from usb_core.c and parsing & set functions. However it's a bit weird that there's hard coded interface selection also there. One would assume these things would be done in user functions or at least in config level.

Posted on March 16, 2017 at 15:48

Would expect specific streams to use different end-points defined by descriptors. The STM32 designs having a finite limit on those.

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