Import code from old repository from 2018

Old repository: https://github.com/binaryDiv/z80_computer

firmware_src/protocol.h

@@ -0,0 +1,16 @@
+#ifndef PROTOCOL_H_
+#define PROTOCOL_H_
+
+#include "config.h"
+#include "protocol.h"
+
+#include "uart.h"
+#include "eeprom.h"
+
+// Reads, parses and executes next command
+void parseNextCommand();
+
+// Runs main loop to parse commands
+void protocolMainLoop();
+
+#endif /* PROTOCOL_H_ */