Add USBDevice.isSuspended()

Based on code originally by Rob van der Veer <rob.c.veer@gmail.com>, this adds
USBDevice.isSuspended(), so user sketches can run custom code in their `loop`
methods after checking if the device is suspended or not.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

1 files changed, 6 insertions, 0 deletions

diff --git a/cores/arduino/USBCore.cpp b/cores/arduino/USBCore.cpp
index 81f689d..c0a4c7c 100644
--- a/cores/arduino/USBCore.cpp
+++ b/cores/arduino/USBCore.cpp
@@ -855,4 +855,10 @@ bool USBDevice_::wakeupHost()
 	return false;
 }
 
+bool USBDevice_::isSuspended()
+{
+	return (_usbSuspendState & (1 << SUSPI));
+}
+
+
 #endif /* if defined(USBCON) */