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PidStructArray[]
This is an array of structures that contain the data needed to support PIDs. for
the purposes of the pseudo code of this service it is assumed that each structure
contains the following information:
1. PidSecure - Set to YES if security access is required to retrieve PID data
2. PidSecurityCode – Set to YES if security code access is required to retrieve
PID data
Other elements may exist in the structure such as a pointer to a function to
retrieve the data, memory address and length information (for a dynamic PID,
see $2D service), etc. Only the PidSecure and PidSecurityCode are shown here
for the purposes of the pseudo code.
The pseudo code uses the following convention to access an element of the
structure:
PidStructArray[0].PidSecure would indicate if security access is required for the
first PID structure in the array.
N/A
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Page 146
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
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

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February 2010
Page 146 of 336
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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