From c2582f6229dc15e19e08c8200773a1c496958f42 Mon Sep 17 00:00:00 2001
From: zolkko <zolkko@gmail.com>
Date: Fri, 29 Apr 2016 01:29:54 +0300
Subject: [PATCH] clear epComplete flag if a packet has been handled in the
 callback

---
 libraries/USBDevice/USBDevice/USBHAL_STM32F4.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/USBDevice/USBDevice/USBHAL_STM32F4.cpp b/libraries/USBDevice/USBDevice/USBHAL_STM32F4.cpp
index 11905ab681..cc29a02707 100644
--- a/libraries/USBDevice/USBDevice/USBHAL_STM32F4.cpp
+++ b/libraries/USBDevice/USBDevice/USBHAL_STM32F4.cpp
@@ -367,7 +367,7 @@ void USBHAL::usbisr(void) {
             else {
                 epComplete |= (1 << endpoint);
                 if ((instance->*(epCallback[endpoint - 2]))()) {
-                    epComplete &= (1 << endpoint);
+                    epComplete &= ~(1 << endpoint);
                 }
             }
         }