USB CDC work only once w/ interupt endp -

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i'm implementing virtual com port on stm32f4 mcu.

the mcu don't have endpoints left available have revome interupt endpoint/notification element. problem mcu can send message pc once, after pc not it.

the device usb descriptor:

interface association descriptor: ------------------------------ 0x08    blength 0x0b    bdescriptortype 0x02    bfirstinterface 0x02    binterfacecount 0x02    bfunctionclass   (communication device class) 0x02    bfunctionsubclass   (abstract control model) 0x01    bfunctionprotocol   (itu-t v.250) 0x06    ifunction  interface descriptor: ------------------------------ 0x09    blength 0x04    bdescriptortype 0x02    binterfacenumber 0x00    balternatesetting 0x00    bnumendpoints 0x02    binterfaceclass   (communication device class) 0x02    binterfacesubclass   (abstract control model) 0x01    binterfaceprotocol   (itu-t v.250) 0x02    iinterface   ""  cdc header functional descriptor: ------------------------------ 0x05    bfunctionallength 0x24    bdescriptortype 0x00    bdescriptorsubtype 0x0110  bcdcdc  cdc call management functional descriptor: ------------------------------ 0x05    bfunctionallength 0x24    bdescriptortype 0x01    bdescriptorsubtype 0x00    bmcapabilities 0x01    bdatainterface  cdc abstract control management functional descriptor: ------------------------------ 0x04    bfunctionallength 0x24    bdescriptortype 0x02    bdescriptorsubtype 0x02    bmcapabilities  cdc union functional descriptor: ------------------------------ 0x05    bfunctionallength 0x24    bdescriptortype 0x06    bdescriptorsubtype 0x00    bcontrolinterface 0x01    bsubordinateinterface(0)  interface descriptor: ------------------------------ 0x09    blength 0x04    bdescriptortype 0x03    binterfacenumber 0x00    balternatesetting 0x02    bnumendpoints 0x0a    binterfaceclass   (cdc data) 0x00    binterfacesubclass    0x00    binterfaceprotocol    0x02    iinterface   ""  endpoint descriptor: ------------------------------ 0x07    blength 0x05    bdescriptortype 0x03    bendpointaddress   (out endpoint) 0x02    bmattributes    (transfer: bulk / synch: none / usage: data) 0x0010  wmaxpacketsize   (16 bytes)  0x00    binterval  endpoint descriptor: ------------------------------ 0x07    blength 0x05    bdescriptortype 0x85    bendpointaddress   (in endpoint) 0x02    bmattributes    (transfer: bulk / synch: none / usage: data) 0x0010  wmaxpacketsize   (16 bytes)  0x00    binterval

if remove useless endpoint usbser windows driver go nuts. have have interupt in endpoint if application never ever use it.


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