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DynamicPidStructArray[]
This is an array of structures that contain the data needed to support dynamic
PIDs. Each structure contains the following information:
•
PidNumber - The dynamic PID number. This is hardcoded in the structure
and is not modified by this service. The DynamicPidStructArray contains an
array element (which is a structure) for each dynamic PID that the ECU
supports.
•
MemAddr - The starting memory address assigned to this dynamic PID via
this service.
•
Length - The number of bytes to be transmitted starting with the contents of
MemAddr when this PID is requested.
The pseudo code uses the following convention to access an element of the
structure:
DynamicPidStructArray[0]. PidNumber would be the PID number of the first
dynamic PID structure in the array.
N/A
NumArrayElements
This is a local variable that contains the number of elements in the
DynamicPidStructArray.
ECU dependent
Index
This is a local variable used in the pseudo code to index into the
DynamicPidStructArray.
0 to
(NumArrayElements -1)
ValidIndex
This is a local variable used in the pseudo code to record the value of Index
when the PID in the request message matches the PidNumber element of the
DynamicPidStructArray.
0 to NumArrayElements
8.11.6.2 Node Interface Pseudo Code.
Powerup States:
None
Each time a $2D message is received, the following logic is executed:
BEGINFUNCTION Serv_2D_Msg_Recvd()
Bad_Address ←
FALSE
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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ValidIndex ←
NumArrayElements
IF (message_data_length != (4 + numAddressBytes
) 
) THEN
send Negative Response ($7F $2D $12) /*Subfunction Not Supported or Invalid Format */
ELSE
IF (the response cannot be sent within P2
C 
ms) THEN
send Negative Response ($7F $2D $78) /*RequestCorrectlyReceived-ResponsePending */
ENDIF
FOR (Index ←
$00 TO (NumArrayElements - 1) BY $01)
IF (parameterIdentifier = DynamicPidStructArray[Index].PidNumber)
ValidIndex ←
Index
Index ←
NumArrayElements /* to exit for loop */
ENDIF
ENDFOR
IF ((ValidIndex = NumArrayElements) OR (memorySize = 0d) OR (memorySize > 7)) THEN
send Negative Response ($7F $2D $31) /*Request Out Of Range */
ELSE
\* Check whether any memory address in the requested interval is protected, restricted (by Security

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Status) or invalid*/
FOR (Memory_Address ←
memoryAddress TO (memoryAddress + memorySize- $01) BY $01)
IF ( ((Memory_Address is secure) AND (Security_Access_Unlocked = FALSE)) OR
(Memory_Address is restricted) OR
(Memory_Address is Invalid) ) THEN
Bad_Address ←
TRUE
Memory_Address ←
(memoryAddress + memorySize) /* exit for loop */
ENDIF
ENDFOR
IF (Bad_Address = TRUE) THEN
send Negative Response ($7F $2D $31) /*Request Out Of Range */
ELSE
DynamicPidStructArray[ValidIndex].MemAddr ←
memoryAddress
DynamicPidStructArray[ValidIndex].Length ←
memorySize
/* send positive response message */
send ($6D $PID_B1 $PID_B2)
ENDIF
ENDIF
ENDIF
ENDFUNCTION
Note: 
The pseudo code above assumes the data contained within the dynamic PID structure is used by the
services that provide PID data when these services build a response message.