USB services: Difference between revisions

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Returns an error when [[#BindDevice]] wasn't used.

Up to 4 interfaces can be used+[[#EnableInterface|enabled]].

Structure of the first buffer(this is similar to [http://libusb.sourceforge.net/api-1.0/structlibusb__interface__descriptor.html libusb__interface__descriptor]):

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| 0x1 || 0x1 || bDescriptorType. Must match 0x4.

|-

| 0x2 || 0x1 || When 0x4, an error will be thrown if ~~certain state checks don't pass~~. Otherwise, ~~this~~ must be <=3.

| 0x2 || 0x1 || bInterfaceNumber. When 0x4, the bInterfaceNumber is automatically allocated(error will be thrown if no space). Otherwise, it's used directly and must be <=3.

|-

| 0x3 || 0x1 || Must match 0x0.

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Takes no arguments. Enables the current interface.

Only one interface can be enabled at time, ~~this indicates which~~ interface is actually used ~~for~~ USB.

Only one interface can be enabled at a time per bInterfaceNumber. When bInterfaceNumber is auto-allocate(0x4) for [[#GetDsEndpoint]] this isn't an issue since the final bInterfaceNumber will be unique.

Once enabled, the device/interface can then actually be used over USB.

=== DisableInterface ===

@@ Line 120: / Line 120: @@
 Returns an error when [[#BindDevice]] wasn't used.
+Up to 4 interfaces can be used+[[#EnableInterface|enabled]].
 Structure of the first buffer(this is similar to [http://libusb.sourceforge.net/api-1.0/structlibusb__interface__descriptor.html libusb__interface__descriptor]):
@@ Line 130: / Line 132: @@
 | 0x1 || 0x1 || bDescriptorType. Must match 0x4.
 |-
-| 0x2 || 0x1 || When 0x4, an error will be thrown if certain state checks don't pass. Otherwise, this must be <=3.
+| 0x2 || 0x1 || bInterfaceNumber. When 0x4, the bInterfaceNumber is automatically allocated(error will be thrown if no space). Otherwise, it's used directly and must be <=3.
 |-
 | 0x3 || 0x1 || Must match 0x0.
@@ Line 221: / Line 223: @@
 Takes no arguments. Enables the current interface.
-Only one interface can be enabled at time, this indicates which interface is actually used for USB.
+Only one interface can be enabled at a time per bInterfaceNumber. When bInterfaceNumber is auto-allocate(0x4) for [[#GetDsEndpoint]] this isn't an issue since the final bInterfaceNumber will be unique.
+Once enabled, the device/interface can then actually be used over USB.
 === DisableInterface ===