Quick and dirty CPU usage fix

src/foohid.c

 #include <stdio.h>
 #include <signal.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <IOKit/IOKitLib.h>
 
                 }
             }
         }
+
+        usleep(1000);
     }
 
     printf("Closing serial port...\n");

src/protocol.c

 #include <stdint.h>
 #include <stdio.h>
 #include <signal.h>
+#include <unistd.h>
 
 #include "serial.h"
 
                 }
             }
         }
+
+        usleep(1000);
     }
 
     serialClose(fd);

src/serial.c

         } else {
             processed += t;
         }
+
+        usleep(1000);
     }
 
     return processed;
         } else {
             processed += t;
         }
+
+        usleep(1000);
     }
 
     return processed;