Additional RawSerial example

Revision:
2:4ab47f33a1ae
Parent:
0:3b040f367dd8
Child:
4:3ad999bfc3c4
--- a/main.cpp	Fri Jun 23 15:49:35 2017 -0500
+++ b/main.cpp	Wed Jan 10 14:24:47 2018 +0000
@@ -7,7 +7,7 @@
 
 void callback_ex() {
     // Note: you need to actually read from the serial to clear the RX interrupt
-    printf("%c\n", pc.getc());
+    pc.putc(pc.getc());
     led2 = !led2;
 }