USB services: Difference between revisions

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Takes an input u16 and 4 input u32s, returns a 0x7-byte output struct and an [[#IClientEpSession]].

~~The user-process loads the input params from the endpoint descriptor.~~ The u16 is '''~~unk~~'''. ~~However~~, ~~audio-sysmodule passes hard-coded values for wMaxPacketSize~~, ~~including 0~~.

The u16 is '''maxUrbCount'''. The u32s are: '''epType''', '''epNumber''', '''epDirection''', and '''maxXferSize'''.

The ~~u32s are:~~ '''~~libusb_transfer_type+1''', '''epNumber~~''', '''~~epDirection~~''', ~~and '''wMaxPacketSize'''~~.

The user-process loads the input params from the endpoint descriptor. HID-sysmodule sets '''maxXferSize''' to wMaxPacketSize from the endpoint descriptor. However, other sysmodules pass hard-coded values for '''maxXferSize''', including 0.

HID-sysmodule passes hard-coded value 0x1 for '''~~unk~~''', for bsd-sysmodule this is 0x2. For audio-sysmodule, this is 0x0, 0x3, or 0x6.

HID-sysmodule passes hard-coded value 0x1 for '''maxUrbCount''', for bsd-sysmodule this is 0x2. For audio-sysmodule, this is 0x0 (used when passing '''maxXferSize'''=0), 0x3, or 0x6.

'''epNumber''' is <code>bEndpointAddress & LIBUSB_ENDPOINT_ADDRESS_MASK</code>. '''epDirection''' is 0x1 for LIBUSB_ENDPOINT_OUT, and 0x2 for LIBUSB_ENDPOINT_IN.

'''epType''' is <code>libusb_transfer_type+1</code>. '''epNumber''' is <code>bEndpointAddress & LIBUSB_ENDPOINT_ADDRESS_MASK</code>. '''epDirection''' is 0x1 for LIBUSB_ENDPOINT_OUT, and 0x2 for LIBUSB_ENDPOINT_IN.

=== IClientEpSession ===

@@ Line 498: / Line 498: @@
 Takes an input u16 and 4 input u32s, returns a 0x7-byte output struct and an [[#IClientEpSession]].
-The user-process loads the input params from the endpoint descriptor. The u16 is '''unk'''. However, audio-sysmodule passes hard-coded values for wMaxPacketSize, including 0.
+The u16 is '''maxUrbCount'''. The u32s are: '''epType''', '''epNumber''', '''epDirection''', and '''maxXferSize'''.
-The u32s are: '''libusb_transfer_type+1''', '''epNumber''', '''epDirection''', and '''wMaxPacketSize'''.
+The user-process loads the input params from the endpoint descriptor. HID-sysmodule sets '''maxXferSize''' to wMaxPacketSize from the endpoint descriptor. However, other sysmodules pass hard-coded values for '''maxXferSize''', including 0.
-HID-sysmodule passes hard-coded value 0x1 for '''unk''', for bsd-sysmodule this is 0x2. For audio-sysmodule, this is 0x0, 0x3, or 0x6.
+HID-sysmodule passes hard-coded value 0x1 for '''maxUrbCount''', for bsd-sysmodule this is 0x2. For audio-sysmodule, this is 0x0 (used when passing '''maxXferSize'''=0), 0x3, or 0x6.
-'''epNumber''' is <code>bEndpointAddress & LIBUSB_ENDPOINT_ADDRESS_MASK</code>. '''epDirection''' is 0x1 for LIBUSB_ENDPOINT_OUT, and 0x2 for LIBUSB_ENDPOINT_IN.
+'''epType''' is <code>libusb_transfer_type+1</code>. '''epNumber''' is <code>bEndpointAddress & LIBUSB_ENDPOINT_ADDRESS_MASK</code>. '''epDirection''' is 0x1 for LIBUSB_ENDPOINT_OUT, and 0x2 for LIBUSB_ENDPOINT_IN.
 === IClientEpSession ===