Страница 1 мировой engineering стандарты общая спецификация

Page 224
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Variable/Meaning
Values
Max_01_Wait_Count 
This is a counter used to compare against the
Num_Loops_For_01 counter to determine when to send a one shot DPID instead
of a periodic scheduled DPID. The value of this variable should be set based on
the number of times the Process_AA_Msgs() function gets called in the
background before a P2
C 
time interval will have elapsed. The objective is to set
this variable to a value which will ensure that a one shot DPID will be sent at a
time interval less than P2
C
.
Value to be determined by
ECU serial data design
engineer.
Service_AA_Msg_Sent
This is a flag used in the Process_AA_Msgs() function to keep track of whether or
not a one shot or periodic DPID has been transmitted.
YES/NO
Min_Loops_Since_Periodic
This is a counter which can be used to force a minimum amount of time between
the transmission of two periodic DPIDs. This can be used to allow one shot
DPIDs to be transmitted during loops when the periodics are not allowed.
Value determined at
compile time of the ECU
software.
Num_Loops_Since_Periodic
This is a counter used to keep track of the number of times the
Process_AA_Msgs() function gets called in the background without sending a
periodic DPID.
$00 to
Min_Loops_Since_Periodic

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8.19.6.2 Node Interface Pseudo Code.
Powerup States:
Call ClearAndDisablePDS()
Resp_01_Num_To_Send ←
$00
Num_Loops_For_01 ←
$00
For (Resp_01_Index ←
$00 TO (max_No_of_01_DPIDs - $01) BY $01)
Resp_01_DPIDs[Resp_01_Index] ←
$00
ENDFOR
The following logic is executed when a Service $AA message is received by the device:
BEGINFUNCTION Serv_AA_Msg_Recvd()
Request_Valid ←
YES
IF (message_data_length > $02)
No_of_DPIDs ←
(message_data_length-$02) /*Calculate number of DPIDs in request*/
ELSE
No_of_DPIDs ←
$00
ENDIF
IF ( ($Level > LEV_SAFR) OR (message_data_length < $02) OR
(($Level > LEV_SS) AND (No_of_DPIDs < $01)) OR
((No_of_DPIDs > max_No_of_01_DPIDs) AND ($Level = LEV_SOR)) OR
((No_of_DPIDs > PDS_Length) AND ($Level != LEV_SOR)) ) THEN
Send Negative Response ($7F $AA $12) /*Invalid Format*/
Request_Valid ←
NO
ELSE IF ($Level != LEV_SS) THEN
/*********************************************************************
Check if all DPIDs are valid (no check performed if $Level =$00) and also
check how many DPIDs in the request are not already scheduled (if the
sub-function parameter($Level)is $02, $03 or $04). These checks are performed
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