From b2102c88154ac1f445da05e71517e8c086094daa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Schneider?= <js@joergschneider.com>
Date: Sat, 19 Feb 2022 00:00:45 +0100
Subject: [PATCH] Fix USBDevice.connected()

* Fix arduino/ArduinoCore-samd#661
* connected() did not return the USB connected state, but essentially a
  random value.
---
 cores/arduino/USB/USBCore.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cores/arduino/USB/USBCore.cpp b/cores/arduino/USB/USBCore.cpp
index f8322436f..5f22739fb 100644
--- a/cores/arduino/USB/USBCore.cpp
+++ b/cores/arduino/USB/USBCore.cpp
@@ -480,8 +480,8 @@ void USBDeviceClass::stall(uint32_t ep)
 bool USBDeviceClass::connected()
 {
 	// Count frame numbers
-	uint8_t f = USB->DEVICE.FNUM.bit.FNUM;
-	//delay(3);
+	uint16_t f = USB->DEVICE.FNUM.bit.FNUM;
+	delay(1); // wait for next SOF
 	return f != USB->DEVICE.FNUM.bit.FNUM;
 }