From a44e342703954fe1fbb1ae3252a5499b37e1ff4f Mon Sep 17 00:00:00 2001
From: PaulStoffregen <paul@pjrc.com>
Date: Sat, 7 Oct 2017 20:45:38 -0700
Subject: [PATCH] Fix order of deferred hub control transfers (KurtE)
 https://forum.pjrc.com/threads/45740-USB-Host-Mouse-Driver?p=155745&viewfull=1#post155745

---
 hub.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hub.cpp b/hub.cpp
index 9467f8e..073e21c 100644
--- a/hub.cpp
+++ b/hub.cpp
@@ -202,7 +202,7 @@ void USBHub::send_setreset(uint32_t port)
 
 static uint32_t lowestbit(uint32_t bitmask)
 {
-	return 31 - __builtin_clz(bitmask);
+	return __builtin_ctz(bitmask);
 }
 
 void USBHub::control(const Transfer_t *transfer)