Index: dialin/dg/cpld.py
===================================================================
diff -u
--- dialin/dg/cpld.py	(revision 0)
+++ dialin/dg/cpld.py	(revision 5baefe4e0455ab80400d8e8aa4400d83bce2dc75)
@@ -0,0 +1,122 @@
+###########################################################################
+#
+# Copyright (c) 2020-2022 Diality Inc. - All Rights Reserved.
+#
+# THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+# WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+#
+# @file    cpld.py
+#
+# @author  (last)      Dara Navaei
+# @date    (last)      20-Jun-2022
+# @author  (original)  Quang Nguyen
+# @date    (original)  20-Jul-2020
+#
+############################################################################
+import struct
+from logging import Logger
+
+from .constants import RESET, NO_RESET
+from ..common.msg_defs import MsgIds, MsgFieldPositions
+from ..protocols.CAN import DenaliMessage, DenaliChannels
+from ..utils.base import AbstractSubSystem, publish, DialinEnum
+from ..utils.checks import check_broadcast_interval_override_ms
+from ..utils.conversions import integer_to_bytearray, float_to_bytearray
+
+
+class Cpld(AbstractSubSystem):
+    """
+    CPLD
+
+    Dialysate Generator (DG) Dialin API sub-class for CPLD related commands.
+    """
+
+    def __init__(self, can_interface, logger: Logger):
+        """
+
+        @param can_interface: Denali Can Messenger object
+        """
+        super().__init__()
+
+        self.can_interface = can_interface
+        self.logger = logger
+
+        if self.can_interface is not None:
+            channel_id = DenaliChannels.dg_sync_broadcast_ch_id
+            msg_id = MsgIds.MSG_ID_DG_CPLD_STATUS.value
+            self.can_interface.register_receiving_publication_function(channel_id, msg_id,
+                                                                       self._handler_cpld_sync)
+        self.cpld_wdog = 0
+        self.cpld_audio = 0
+        self.cpld_fault_led = 0
+        self.cpld_clean_led = 0
+
+    def get_cpld(self):
+        """
+        Gets the current CPLD values
+
+        @return: List containing cpld values: [ cpld_wdog, cpld_audio, cpld_fault_led, cpld_clean_led ]
+        """
+        return [self.cpld_wdog, self.cpld_audio,
+                self.cpld_fault_led, self.cpld_clean_led]
+
+    @publish(["cpld_wdog", "cpld_audio", "cpld_fault_led", "cpld_clean_led"])
+    def _handler_cpld_sync(self, message):
+        """
+        Handles published CPLD data messages.  CPLD data are captured
+        for reference.
+
+        @param message:  published CPLD data message
+        @return: None
+        """
+
+        self.cpld_wdog = struct.unpack('B', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_1:MsgFieldPositions.START_POS_FIELD_1 + 1]))[0]
+        self.cpld_audio = struct.unpack('B', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_1 + 1:MsgFieldPositions.START_POS_FIELD_1 + 2]))[0]
+        self.cpld_fault_led = struct.unpack('B', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_1 + 2:MsgFieldPositions.START_POS_FIELD_1 + 3]))[0]
+        self.cpld_clean_led = struct.unpack('B', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_1 + 3:MsgFieldPositions.START_POS_FIELD_1 + 4]))[0]
+
+    def cmd_cpld_data_broadcast_interval_override(self, ms: int, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends the cpld data broadcast interval override command
+        Constraints:
+            Must be logged into DG.
+            Given interval must be non-zero and a multiple of the DG general task interval (50 ms).
+
+        @param ms:  integer - interval (in ms) to override with
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+        """
+
+        if not check_broadcast_interval_override_ms(ms):
+            return False
+
+        reset_byte_array = integer_to_bytearray(reset)
+        ms_byte_array = integer_to_bytearray(ms)
+        payload = reset_byte_array + ms_byte_array
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dg_ch_id,
+                                              message_id=MsgIds.MSG_ID_CPLD_PUBLISH_INTERVAL_OVERRIDE.value,
+                                              payload=payload)
+
+        self.logger.debug("override DG CPLD broadcast interval")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            if reset == RESET:
+                str_res = "reset back to normal: "
+            else:
+                str_res = str(ms) + " ms: "
+            self.logger.debug("CPLD data broadcast interval overridden to " + str_res +
+                              str(received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]))
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.error("Timeout!!!!")
+            return False