Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r1f1b53030a930c542646d9d88c7db0c3a945f150 -r237bd674ddef86d5137221163e74162cd12e4fb9
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 1f1b53030a930c542646d9d88c7db0c3a945f150)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 237bd674ddef86d5137221163e74162cd12e4fb9)
@@ -52,6 +52,11 @@
 #define MSG_NOT_ACKED_MAX_RETRIES       3                                   ///< maximum number of times a message that requires ACK that was not ACK'd can be re-sent before alarm
 #define PENDING_ACK_LIST_SIZE           25                                  ///< maximum number of Delanli messages that can be pending ACK at any given time
 
+//#define MAX_FPGA_CLOCK_SPEED_ERRORS             3                           ///< maximum number of FPGA clock speed errors within window period before alarm - // DN-16SEPT2022 TOSO: uncomment this line.
+#define MAX_FPGA_CLOCK_SPEED_ERRORS             1                           ///< maximum number of FPGA clock speed errors within window period before alarm - // ToDO: remove this line.  DN-16SEPT2022
+//#define MAX_FPGA_CLOCK_SPEED_ERROR_WINDOW_MS    (10 * SEC_PER_MIN * MS_PER_SECOND)    ///< FPGA clock speed error window - // TODO: uncomment it - DN-19SEPT2022
+#define MAX_FPGA_CLOCK_SPEED_ERROR_WINDOW_MS    (1 * SEC_PER_MIN * MS_PER_SECOND)    ///< FPGA clock speed error window - // TODO: Force 1 minute for testing ONLY. remove it - DN-19SEPT2022
+
 #pragma pack(push, 1)
 
 /// Record for transmitted message that is pending acknowledgement from receiver.
@@ -136,6 +141,9 @@
     // initialize bad message CRC time windowed count
     initTimeWindowedCount( TIME_WINDOWED_COUNT_BAD_MSG_CRC, MAX_COMM_CRC_FAILURES, MAX_COMM_CRC_FAILURE_WINDOW_MS );
 
+    // initialize FPGA clock speed error time windowed count
+    initTimeWindowedCount( TIME_WINDOWED_COUNT_FPGA_CLOCK_SPEED_ERROR, MAX_FPGA_CLOCK_SPEED_ERRORS, MAX_FPGA_CLOCK_SPEED_ERROR_WINDOW_MS);
+
     // initialize pending ACK list
     for ( i = 0; i < PENDING_ACK_LIST_SIZE; i++ )
     {