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


GM WORLDWIDE ENGINEERING STANDARDS



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 228 of 336 
The following function, Send_AA_One_Shot(), is called by the background function Process_AA_Msgs() that 
handles processing one time and periodic responses for the $AA service. This function will send one DPID 
each time that it is called. 
BEGINFUNCTION Send_AA_One_Shot() 
IF (Resp_01_Num_To_Send > $00) THEN 
FOR (Resp_01_Index 

$00 TO (max_No_of_01_DPIDs - $01) BY $01) 
IF (Resp_01_DPIDs[Resp_01_Index] != $00) 
/* Get current data (DB_1,... DBx) for this DPID and send it*/ 
Send positive response ($UUDTCANId $Resp_01_DPIDs[Resp_01_Index] $DB_1, ....) 
Resp_01_Num_To_Send 

(Resp_01_Num_To_Send - $01) 
Resp_01_DPIDs[Resp_01_Index] 

$00 
Resp_01_Index 

max_No_of_01_DPIDs 
Num_Loops_For_01 

$00 
Service_AA_Msg_Sent 

YES 
ENDIF 
ENDFOR 
ENDIF 
ENDFUNCTION 
The following function, Process_AA_Msgs(), is called in a background loop and handles sending one shot 
($Level = LEV_SOR) and periodic ($Level = LEV_SAFR, LEV_SAMR, or LEV_SASR) DPID responses. The 
execution rate of this function shall be fast enough to ensure that each element of the PDS has the opportunity 
to be transmitted within the P2
C
* timing window. This ensures a maximum of 1 negative response with 
response code $78 per periodic request. This execution rate of this function shall also be at an interval less 
than or equal to half of the fast periodic rate. If the value of the fast periodic rate is close to the value of P2
C

then the execution interval must be small enough to ensure that responses to level $01 requests can meet the 
P2
C
timing requirements. 
BEGINFUNCTION Process_AA_Msgs() 
IF ((PDS_Number_Active > $00) OR (Resp_01_Num_To_Send > $00)) THEN 
Service_AA_Msg_Sent 

NO 
IF (Num_Loops_For_01 
≥ Max_01_Wait_Count) THEN 
CALL Send_AA_One_Shot() 
IF (PDS_Number_Active > $00) THEN 
CALL DecrementPDS_Counters() 
ENDIF 
ELSE 
CALL Send_AA_Periodic_Msgs() 
IF (Service_AA_Msg_Sent = NO) THEN 
CALL Send_AA_One_Shot() 
ELSE 
IF (Resp_01_Num_To_Send > $00) THEN 
Num_Loops_For_01 

(Num_Loops_For_01 + $01) 
ENDIF 
ENDIF 
ENDIF 
ENDIF 
ENDFUNCTION 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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