Changed USB Serial so that it will send to the host even if DTR is not set. Note this does not effect the operation of the boolean operation e.g.. while(!Serial); used to wait for the Arduino terminal to open

Author: rogerclarkmelbourne

STM32F1/cores/maple/usb_serial.cpp

@@ -119,9 +119,16 @@ size_t n = 0;
 size_t USBSerial::write(const uint8 *buf, uint32 len)
 {
 size_t n = 0;
-    if (!(bool) *this || !buf) {
+
+#ifdef USB_SERIAL_REQUIRE_DTR
+ if (!(bool) *this || !buf) {
+        return 0;
+    }
+#else	
+	if (!buf || !(usb_is_connected(USBLIB) && usb_is_configured(USBLIB))) {
         return 0;
     }
+#endif	
 
     uint32 txed = 0;
     while (txed < len) {