Страница 1 мировой engineering стандарты общая спецификация

Page 114
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
8.6.6.2 Node Interface Pseudo Code.
Powerup States:
None
The following logic is executed when a request message with ServiceId $22 is received by the ECU:
BEGIN FUNCTION Serv_22_Msg_Recvd()
IF ((message_data_length < 3) OR ((message_data_length > max_22_Msglength) OR
((message_data_length MOD 2) = 0)) THEN
Srv_22_NRC ←
$12
ELSE
Srv_22_NRC ←
$00
Num_PIDs_Requested ←
((message_data_length - 1)/2)
/* Populate ReqPIDArray[] with PID numbers from request message. There is no eloquent way to show
this in pseudo code so it is assumed in the pseudo code that it gets done through typecasting or some
type of pointer manipulation (language dependant) */
Process_Request ←
FALSE
FOR (ReqIndex ←
$00 TO (Num_PIDs_Requested - 1) BY $01)
/* loop through array of PID structures to see if requested PID is valid */
FOR (Index ←
$00 TO (NumArrayElements - 1) BY $01)
IF (ReqPIDArray[ReqIndex] = PidStructArray[Index].PidNumber) THEN
IF ((PidStructArray[Index].PidSecure = NO OR Security_Access_Unlocked = TRUE) AND
(PidStructArray[Index].PidSecurityCode = NO OR Security_Access_Allowed = TRUE)) THEN
Process_Request ←
TRUE
IF (PidStructArray[Index].Rc78Needed = YES) THEN
Srv_22_NRC ←
$78
ENDIF
Index ←
NumArrayElements /* to exit for loop */
ENDIF
ENDIF
ENDFOR
ENDFOR
IF (Process_Request = TRUE) THEN
IF (Srv_22_NRC = $78) THEN
Srv_22_NRC ←
$00
send ($7F $22 $78)
ENDIF
/* obtain PID data - The pseudo code does not dictate how this is done. For example, the data may be
retrieved via a call to a function whose pointer is contained in the PID structure. Another example
would be to obtain the data via a global variable or by accessing memory and length information for a
dynamic PID. This is not intended to be the comprehensive list on how to do this */
FOR (ReqIndex ←
$00 TO (Num_PIDs_Requested - 1) BY $01)
FOR (Index ←
$00 TO (NumArrayElements - 1) BY $01)
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---

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WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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February 2010
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