Added checksumFailurePin

src/SparkFun_Ublox_Arduino_Library.cpp

@@ -526,9 +526,12 @@ void SFE_UBLOX_GPS::processUBX(uint8_t incoming, ubxPacket *incomingUBX)
         debugPrintln((char *)"Checksum failed. Response too big?");
 
         //Drive an external pin to allow for easier logic analyzation
-        digitalWrite(2, LOW);
-        delay(10);
-        digitalWrite(2, HIGH);
+        if (checksumFailurePin >= 0)
+        {
+          digitalWrite((uint8_t)checksumFailurePin, LOW);
+          delay(10);
+          digitalWrite((uint8_t)checksumFailurePin, HIGH);
+        }
 
         _debugSerial->print(F("Size: "));
         _debugSerial->print(incomingUBX->len);

src/SparkFun_Ublox_Arduino_Library.h

@@ -76,6 +76,10 @@
 #endif
 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 
+//Define a digital pin to aid checksum failure capture and analysis
+//Leave set to -1 if not needed
+const int checksumFailurePin = -1;
+
 //Registers
 const uint8_t UBX_SYNCH_1 = 0xB5;
 const uint8_t UBX_SYNCH_2 = 0x62;