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STM32f103 USB EP3 Interrupt Problem

Question asked by Gil on Oct 1, 2013
Latest reply on Oct 1, 2013 by Gil
I am trying to configure the STM32F103 to be a device on the USB. I used the Virtual_COM_Port as a starting point. My USB config is as follows:

-ep1=bulk OUT
-ep2=bulk IN

EP0, EP1 and EP2 seem to be functioning correctly, but EP3 has issues. From my USB monitor I can see an IN packet being sent from the host to the device's EP3, but the device does not respond. I have a 22 bytes message ready to go This is strange because it is initialized the same as EP2 except SetEPType(ENDP3, EP_INTERRUPT);

My Reset routine and descriptors are attached: