General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 146 of 336 
8.10.6.2 Node Interface Pseudo Code. 
Powerup States: 
All dynamic DPIDs are initialized to a data length of $00 
Each time a $2C message is received, the following logic is executed: 
BEGINFUNCTION Serv_2C_Msg_Recvd() 
valid_request 

NO 
IF ((message_data_length < 4) OR /* message must have at least 4 data bytes */ 
((message_data_length MOD 2) != 0)) THEN /* length must be even number */ 
send Negative Response ($7F $2C $12) /* InvalidFormat */ 
ELSE 
FOR (DPID_Index 

0 TO max_Dynamic_DPID_Index BY 1) 
IF ($DPIDIdentifier = Supported_Dyn_DPIDs[DPID_Index]) THEN 
valid_request 

YES 
DPID_Index 

max_Dynamic_DPID_Index 
ENDIF 
ENDFOR 
IF (valid_request = NO) THEN 
send Negative Response ($7F $2C $31) /* RequestOutOfRange */ 
ENDIF 
ENDIF 
IF (valid_request = YES) 
IF (Processing this message will take more than P2
C
ms) THEN
Send ($7F $2C $78) /*for RequestCorrectlyReceived-ResponsePending */ 
ENDIF 
invalid_PID 

NO 
total_length 

0 
FOR (PID_Req_Index 

0 TO (message_data_length - 4) BY 2) 
Requested_PID 

((PIDData[PID_Req_Index] << 8) | 
(PIDData[PID_Req_Index + 1])) 
PID_Found 

NO 
FOR (PID_Index 

0 TO max_PID_index BY 1) 
IF (Requested_PID = PIDs_Supported[PID_Index].PID_Number) AND 
((PidStructArray[Index].PidSecure = NO) OR Security_Access_Unlocked = TRUE)) AND 
((PidStructArray[Index].PidSecurityCode = NO) OR (Security_Access_Allowed = TRUE)) 
PID_Found 

YES 
total_length 

(total_length + PIDs_Supported[PID_Index].length) 
PID_Index 

max_PID_index 
ENDIF 
ENDFOR 
IF (PID_Found = NO) 
invalid_PID 

YES 
PID_Req_Index 

(message_data_length - 2) 
ENDIF 
ENDFOR 
IF (invalid_PID = YES) 
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