Arduino test firmware for serial comms

Use for timing tests, configuration protocols (figuring out what is
attached and which arduino handles which function)

ino/mcopy_serial_tests/mcopy_serial_tests.ino

@@ -0,0 +1,23 @@
+volatile char cmd_char = 'z';
+
+void setup() {
+    Serial.begin(57600);
+    Serial.flush();
+}
+
+void loop() {
+  if (Serial.available()) {
+    /* read the most recent byte */
+    cmd_char = (char)Serial.read();
+  }
+  if (cmd_char != 'z') {
+    cmd(cmd_char);
+    cmd_char = 'z';
+  }
+}
+
+void cmd (char val) {
+  if (val == 'a') {
+    Serial.println("a");//End of action
+  }
+}