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Add a reference to libusb ticket on incorrect max iso packet size.

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Sebastian Zagrodzki
2017-02-05 16:49:02 +01:00
parent c1b87403fa
commit 9849c8088e
1 changed files with 1 additions and 0 deletions
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usb/config.go
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@@ -139,6 +139,7 @@ func newConfig(dev *C.libusb_device, cfg *C.struct_libusb_config_descriptor) Con
// Don't use libusb_get_max_iso_packet_size, as it has a bug where it returns the same value // Don't use libusb_get_max_iso_packet_size, as it has a bug where it returns the same value
// regardless of alternative setting used, where different alternative settings might define different // regardless of alternative setting used, where different alternative settings might define different
// max packet sizes. // max packet sizes.
// See http://libusb.org/ticket/77 for more background.
ei.MaxIsoPacket = uint32(end.wMaxPacketSize) & 0x07ff * (uint32(end.wMaxPacketSize)>>11&3 + 1) ei.MaxIsoPacket = uint32(end.wMaxPacketSize) & 0x07ff * (uint32(end.wMaxPacketSize)>>11&3 + 1)
} }
i.Endpoints = append(i.Endpoints, ei) i.Endpoints = append(i.Endpoints, ei)