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Added writeSysMemory to GE_SRTP.py #3

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Added writeSysMemory to GE_SRTP.py #3

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33 changes: 32 additions & 1 deletion lib/GE_SRTP.py
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,38 @@ def closeConnection(self):
except Exception as err:
print("Exception:" + str(err))

###########################################################
# Generates command string to send to PLC for writing
# registers. Expects format of R#### etc.
# Returns: Bytearray for sending via socket.
###########################################################
def writeSysMemory(self, reg, val):
if not re.search('%*(R|AI|AQ|I|Q)\d+',reg):
raise Exception("Invalid Register Address! (" + reg + ").")

try:
# Make copy of generic base message
tmp = GE_SRTP_Messages.BASE_MSG.copy()
tmp[42] = GE_SRTP_Messages.SERVICE_REQUEST_CODE["WRITE_SYS_MEMORY"]
# Update for type of register
tmp[43] = GE_SRTP_Messages.MEMORY_TYPE_CODE[re.search('(R|AI|AQ|I|Q)',reg)[0]]
# 0 based register to read
address = int(re.search('\d+',reg)[0]) - 1
tmp[44] = int(address & 255).to_bytes(1,byteorder='big') # Get LSB of Word
tmp[45] = int(address >> 8 ).to_bytes(1,byteorder='big') # Get MSB of Word
# Update for width
tmp[46] = b'\x01' # DANGER - TODO make dynamic for different data types.
tmp[47] = b'\x00'
# Value
tmp[48] = int(int(val) & 255).to_bytes(1,byteorder='big') # Get LSB of Word
tmp[49] = int(int(val) >> 8 ).to_bytes(1,byteorder='big') # Get MSB of Word
bytes_to_send = b''.join(tmp)
# Send to PLC, Read Response back as memory value (string type)
response = self.sendSocketCommand(bytes_to_send)
return(GeSrtpResponse(response))
except Exception as err:
print(err)
raise Exception("Failure reading PLC or Register from PLC. Abort")

###########################################################
# Generates command string to send to PLC for reading
Expand Down Expand Up @@ -236,4 +267,4 @@ def printLimitedBin(self, pre_msg, msg, start=7, end=7):
if iter_len - idx <= end:
hex_resp_end += " {:02x}".format(x)

print("{}{}...{} (Only Displaying {} of {} bytes)".format(pre_msg, hex_resp_start, hex_resp_end, start + end, len(msg)))
print("{}{}...{} (Only Displaying {} of {} bytes)".format(pre_msg, hex_resp_start, hex_resp_end, start + end, len(msg)))