From 9546dcb722af67ea3cfd3a4c2357d6cb85e9d0c6 Mon Sep 17 00:00:00 2001
From: "Andrew J. Kroll" <xxxajk@gmail.com>
Date: Sat, 13 Jan 2018 22:36:01 -0500
Subject: [PATCH] Fix ESP RTOS WDT corner case

---
 Usb.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Usb.cpp b/Usb.cpp
index c46ea5b3..d43d63b6 100644
--- a/Usb.cpp
+++ b/Usb.cpp
@@ -382,11 +382,17 @@ uint8_t USB::dispatchPkt(uint8_t token, uint8_t ep, uint16_t nak_limit) {
         uint16_t nak_count = 0;
 
         while((int32_t)((uint32_t)millis() - timeout) < 0L) {
+#ifdef ESP8266
+                        yield(); // needed in order to reset the watchdog timer on the ESP8266
+#endif
                 regWr(rHXFR, (token | ep)); //launch the transfer
                 rcode = USB_ERROR_TRANSFER_TIMEOUT;
 
                 while((int32_t)((uint32_t)millis() - timeout) < 0L) //wait for transfer completion
                 {
+#ifdef ESP8266
+                        yield(); // needed in order to reset the watchdog timer on the ESP8266
+#endif
                         tmpdata = regRd(rHIRQ);
 
                         if(tmpdata & bmHXFRDNIRQ) {