From 446b27ea8127d0d827e2b563a75e0d505c10597d Mon Sep 17 00:00:00 2001
From: Paul <5690545+PaulZC@users.noreply.github.com>
Date: Thu, 26 Dec 2019 08:18:23 +0000
Subject: [PATCH] Added checksumFailurePin

---
 src/SparkFun_Ublox_Arduino_Library.cpp | 9 ++++++---
 src/SparkFun_Ublox_Arduino_Library.h   | 4 ++++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/SparkFun_Ublox_Arduino_Library.cpp b/src/SparkFun_Ublox_Arduino_Library.cpp
index 7a60917..2950582 100644
--- a/src/SparkFun_Ublox_Arduino_Library.cpp
+++ b/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);
diff --git a/src/SparkFun_Ublox_Arduino_Library.h b/src/SparkFun_Ublox_Arduino_Library.h
index 3fe4204..e0bd5e4 100644
--- a/src/SparkFun_Ublox_Arduino_Library.h
+++ b/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;