fixed delayMicroseconds(0) bug in readAndReportData that was causing delays when reporting i2c data

Author: soundanalogous

examples/StandardFirmata/StandardFirmata.ino

@@ -99,7 +99,11 @@ void readAndReportData(byte address, int theRegister, byte numBytes) {
     Wire.send((byte)theRegister);
     #endif
     Wire.endTransmission();
-    delayMicroseconds(i2cReadDelayTime);  // delay is necessary for some devices such as WiiNunchuck
+    // do not set a value of 0
+    if (i2cReadDelayTime > 0) {
+      // delay is necessary for some devices such as WiiNunchuck
+      delayMicroseconds(i2cReadDelayTime);
+    }
   } else {
     theRegister = 0;  // fill the register with a dummy value
   }