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HID Packet Taking Too Long at FS USB

Question asked by Joshua on Jul 28, 2014
Latest reply on Jul 28, 2014 by Joshua
I have two different projects: one based on the '205, one on the '427, Both use identical USB libraries from ST. They are both set up as FS devices using the internal USB PHY. The issue I am seeing is that in the '205 project, the function USBD_HID_SendReport (which actually just calls "DCD_EP_Tx") is taking ~30uS to execute (just what I'd expect). However, the project based on the '427 is taking ~600uS to send the exact same report. 

What setting do I have wrong? I've done a compare/diff on the USB-related files between the two and they seem identical. 

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