bugAVR In-System Programmer - Bugs: bug #1745, VTarget and ARef programming or...

 
 

bug #1745: VTarget and ARef programming or reading with STK500 is wrong

Submitted by:  None
Submitted on:  Mon 18 Nov 2002 08:54:46 PM UTC  
 
Category: NoneSeverity: 3 - Normal
Item Group: NoneStatus: Wont Fix
Privacy: PublicAssigned to: Theodore A. Roth <troth>
Originator Email: -unavailable-Open/Closed: Closed

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Fri 11 Jul 2003 04:30:40 AM UTC, comment #2:

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.

Anonymous
Thu 13 Mar 2003 05:51:07 PM UTC, comment #1:

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.

Theodore A. Roth <troth>In charge of this item.
Mon 18 Nov 2002 08:54:46 PM UTC, 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.

Anonymous

 

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Follow 4 latest changes.

Date Changed By Updated Field Previous Value => Replaced By
Thu 13 Mar 2003 05:51:06 PM UTCtrothStatusNone=>(Error - Not Found)
  Assigned toNone=>NA
  Originator Email=>
  Open/ClosedOpen=>(Error - Not Found)

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