diff options
Diffstat (limited to 'lib/libusb/libusb20.3')
| -rw-r--r-- | lib/libusb/libusb20.3 | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/libusb/libusb20.3 b/lib/libusb/libusb20.3 index 403ddba..f902883 100644 --- a/lib/libusb/libusb20.3 +++ b/lib/libusb/libusb20.3 @@ -310,8 +310,13 @@ packets are avoided for proxy buffers. .Pp . .Fn libusb20_tr_get_max_total_length -function will return the maximum value for the length sum of all -USB frames associated with an USB transfer. +function will return the maximum value for the data length sum of all USB +frames associated with an USB transfer. +In case of control transfers the value returned does not include the +length of the SETUP packet, 8 bytes, which is part of frame zero. +The returned value of this function is always aligned to the maximum +packet size, wMaxPacketSize, of the endpoint which the USB transfer is +bound to. . .Pp . |
