From a19ac0f65490cec94ecb9b15ed9a3eea020a9dcc Mon Sep 17 00:00:00 2001
From: Sebastian Zagrodzki <sebek@zagrodzki.net>
Date: Wed, 8 Feb 2017 22:35:45 +0100
Subject: [PATCH] Per
 http://www.beyondlogic.org/usbnutshell/usb5.shtml#EndpointDescriptors: bits
 0-3 are endpoint number, 4-6 reserved, set to zero, bit 7 is direction. Bits
 0-3 is 0x0f.

---
 usb/constants.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usb/constants.go b/usb/constants.go
index b4dc590..88a28b7 100644
--- a/usb/constants.go
+++ b/usb/constants.go
@@ -87,7 +87,7 @@ func (dt DescriptorType) String() string {
 type EndpointDirection uint8
 
 const (
-	ENDPOINT_NUM_MASK                   = 0x03
+	ENDPOINT_NUM_MASK                   = 0x0f
 	ENDPOINT_DIR_IN   EndpointDirection = C.LIBUSB_ENDPOINT_IN
 	ENDPOINT_DIR_OUT  EndpointDirection = C.LIBUSB_ENDPOINT_OUT
 	ENDPOINT_DIR_MASK EndpointDirection = 0x80