[Uisp-dev] [bug #1745] VTarget and ARef programming or reading with STK500 is wrong

[nobody]

=================== BUG #1745: LATEST MODIFICATIONS ==================
http://savannah.nongnu.org/bugs/?func=detailbug&bug_id=1745&group_id=2117

Changes by: Anonymous user        Date: Fri 07/11/2003 at 00:30

------------------ Additional Follow-up Comments ----------------------------
Yes, this is known to be a firmware problem; an Atmel representative confirmed 
this some time ago.  The problem was introduced in a firmware version around 
1.20; they said it would be fixed in the next version, but I never checked to 
see if it actually was.



=================== BUG #1745: FULL BUG SNAPSHOT ===================


Submitted by: None                    Project: AVR In-System Programmer     
Submitted on: Mon 11/18/2002 at 15:54
Category:  None                       Severity:  5 - Major                  
Bug Group:  None                      Resolution:  Wont Fix                 
Assigned to:  troth                   Originator Email:  unknown            
Status:  Closed                       

Summary:  VTarget and ARef programming or reading with STK500 is wrong

Original Submission:  $ uisp  -dprog=stk500 -dpart=AT90S8535 -mode=s --waref=5.0
Atmel AVR AT90S8535 is found.

$ uisp  -dprog=stk500 -dpart=AT90S8535 -mode=s --raref
Atmel AVR AT90S8535 is found.
ARef is set to 5.1 V

Setting aref or vtar to 5.0V gives 5.1V when reading. There is always 0.1V 
difference between writing and reading.

Follow-up Comments
*******************

-------------------------------------------------------
Date: Fri 07/11/2003 at 00:30       By: None
Yes, this is known to be a firmware problem; an Atmel representative confirmed 
this some time ago.  The problem was introduced in a firmware version around 
1.20; they said it would be fixed in the next version, but I never checked to 
see if it actually was.

-------------------------------------------------------
Date: Thu 03/13/2003 at 12:51       By: troth
This can't be fixed. It is a problem with the firmware in the stk500 as far as 
I can tell. I think that the algorithm used to determine the voltage using the 
ADC in the 8535 is the culprit.


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http://savannah.nongnu.org/bugs/?func=detailbug&bug_id=1745&group_id=2117

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