Interpreters Document


Interpreter 0 - UART Communications Programming Op-Codes



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dps Interpreters

Interpreter 0 - UART Communications Programming Op-Codes 
CameraLoops.com



1993-2011 General Motors Company, GM Customer Care & Aftersales. All Rights Reserved.
Page
17 
UART Support for No Communication Faults 
 
Supported By:
UART Interpreter 0 
 
Description: 
Normal processing of a request message is to re-send the request up to three times if the transmission of a 
request fails. However, if the transmission is successful and no controllers respond to the request, then the 
request will fail with a no communications fault.
The goto fields in the interpreter can be used to force the tool to execute another step rather than re-sending 
the same ALDL message.
 
This is accomplished by putting a FD in one of the first bytes of a goto field (G0, 
G2, G4, G6, or G8).
 
The no communications screen will still be displayed but after verification the tool will goto 
the step specified by the FD rather than re-send the same ALDL message. 
The option also exists to have the tool ignore any no communication faults.
 
If this is necessary, it needs to be 
explained in the device‟s reprogramming specification because this processing is handled internal to the tool 
software. 
Typical Interpreter Line: 
Step 
Op-Code 
Action Fields
Goto Fields 
XX 
OP 
01 03 F4 00 
AA 09
 FD
12
 
FF 4A
 00
00
 00
00 
Pseudo Code: 
XX OP AC0 AC1 AC2 AC3 G0-G1 G2-G3 G4-G5 G6-G7 G8-G9 
If 
the Op-Code (OP) Ignores No Communication Faults
Continue reprogramming process
Else 
Display the no communication screen
Verification is received
Check the goto fields for a FD return code (G0, G2, G4, G6, or G8) 
If 
a FD Return Code is Found
Flag appropriate step to execute next and return
Else 
Do While
 No Response
Send the ALDL message again 
If 
This Is the Third Failure
End reprogramming process as a no comm fault 
Endif 
this is the third failure
End do while
 no response
Endif 
an FD return code is found
Endif the Op-Code (OP) ignores no communication faults
CameraLoops.com



1993-2011 General Motors Company, GM Customer Care & Aftersales. All Rights Reserved.
Page
18 

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