I have been trying to develop a composite USB device with CDC+MSC on stm32L4S5. For that, I required total of 5 endpoints. 2 for MSC (1 bulk IN and 1 bulk OUT). 3 for CDC(1 bulk in, 1 bulk out, 1 CDC command). For that, I am trying to use endpoints 1,2, and 3. However, OUT transfer works on any endpoint i.e 1, 2, or 3. However, IN transfer works only in EP 1. IN transfer doesn't work if I use endpoint 2 or 3. Is there any known issue? Anybody has tried using endpoints apart from 1.
