added inital serial port flush, serial handeling changes. rate display bugfix

serial_io.h

@@ -3,7 +3,10 @@
 #include <termios.h>
 #include <fcntl.h>
 #include <unistd.h>
+
+#ifdef __cplusplus
 #include <iostream>
+#endif
 
 #define BAUDRATE B38400
 
@@ -13,6 +16,9 @@ void sWrite(int port, const char string[], size_t length);
 
 ssize_t sRead(int port, void *buf, size_t count);
 
+#ifdef __cplusplus
+void printRates();
+#endif
 
 int serialport_init(const char* device, int baud = BAUDRATE);