I have a device that has two bulk endpoints with addresses 0x05 and 0x85. Libusbcpp ignores the latter completely for the following reason.
In InterfaceImpl::CreateEndpoints(), a new std::shared_ptr<Endpoint> named pEndpoint is created and then inserted into a std::map like so:
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m_EndpointContainer.insert(std::make_pair(pEndpoint->Number(), pEndpoint)); |
The map key being generated by Endpoint::Number, which is implemented like so:
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return (m_pEndpointDescriptor->bEndpointAddress & 0x0F); |
Since the key omits the upper nibble of the address, it's impossible to store a pair of endpoints with opposite directions but the same endpoint number. The second insert has no effect (because the key already exits), and the newly created Endpoint is deleted.
A subsequent call to Interface::getEPNumberByIndex() throws std::logic_error(LibUSB::InterfaceImpl::getEPNumberByIndex(): Endpoint not found.)
I have a device that has two bulk endpoints with addresses
0x05and0x85. Libusbcpp ignores the latter completely for the following reason.In
InterfaceImpl::CreateEndpoints(), a newstd::shared_ptr<Endpoint>namedpEndpointis created and then inserted into a std::map like so:Libusbpp/src/InterfaceImpl.cpp
Line 424 in 389ceea
The map key being generated by
Endpoint::Number, which is implemented like so:Libusbpp/src/EndpointImpl.cpp
Line 57 in 389ceea
Since the key omits the upper nibble of the address, it's impossible to store a pair of endpoints with opposite directions but the same endpoint number. The second
inserthas no effect (because the key already exits), and the newly createdEndpointis deleted.A subsequent call to
Interface::getEPNumberByIndex()throwsstd::logic_error(LibUSB::InterfaceImpl::getEPNumberByIndex(): Endpoint not found.)