Merge pull request #1075 from julbouln/master

add suspend callback to STM32F4 USBDevice HAL

Author: 0xc0170

libraries/USBDevice/USBDevice/USBHAL_STM32F4.cpp

@@ -307,7 +307,13 @@ void USBHAL::_usbisr(void) {
 
 
 void USBHAL::usbisr(void) {
+    if (OTG_FS->GREGS.GINTSTS & (1 << 11)) { // USB Suspend
+        suspendStateChanged(1);
+    };
+
     if (OTG_FS->GREGS.GINTSTS & (1 << 12)) { // USB Reset
+        suspendStateChanged(0);
+
         // Set SNAK bits
         OTG_FS->OUTEP_REGS[0].DOEPCTL |= (1 << 27);
         OTG_FS->OUTEP_REGS[1].DOEPCTL |= (1 << 27);