add Serial1_test sketch

Author: hathach

libraries/Bluefruit52Lib/examples/Hardware/Serial1_test/Serial1_test.ino

@@ -0,0 +1,46 @@
+/*********************************************************************
+ This is an example for our Feather Bluefruit modules
+
+ Pick one up today in the adafruit shop!
+
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+/*
+ * This sketch demonstrate how to use Hardware Serial1 along with
+ * native USB Serial on Bluefruit nRF52840.
+ * Note: Bluefruit nRF52832 does not support Serial1
+ */
+
+#include "Arduino.h"
+
+void setup()
+{
+  // Open serial communications and wait for port to open:
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);   // for nrf52840 with native usb
+
+  Serial.println("Goodnight moon!");
+ 
+  // set the data rate for the SoftwareSerial port
+  //mySerial.begin(9600);
+  //mySerial.println("Hello, world?");
+
+  Serial1.begin(115200);
+  Serial1.println("Hello, world?");
+}
+
+void loop() // run over and over//
+{
+  if (Serial1.available()) 
+    Serial.write(Serial1.read());
+
+  if (Serial.available())
+    Serial1.write(Serial.read());
+}