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RE: [avr-gcc-list] What has changed between WinAVR 20070525rc2 andWinAVR
RE: [avr-gcc-list] What has changed between WinAVR 20070525rc2 andWinAVR 20080430?
Mon, 12 May 2008 14:50:56 -0600
Umm, describe "no longer works correctly". There are two defects
that I know of that can cause problems:
1. If a function is called from an ISR, the ISR will not pre-save
all of the "call-used" registers before calling the function. This can
cause serious and hard-to-track-down problems. The only workaround on this
that I know of is to hand-save all call-used registers on entry to the ISR and
restore them before exit. WinAVR defect 1956569 A patch has
been submitted according to Eric.
2. On 3-byte PC processors (ATmega2560/2561), the EEPROM routines
will not work correctly. This is because they were rewritten to use
function pointers, and GCC only knows about 2-byte function pointers. A
patched eeprom.h file has been submitted. AVR-LibC Bug
These are both changes from WinAVR 20071221 that caused my code to
fail. There may be more, but because of problem 1 above, I cannot get my
code to run long enough to find anything else.
If you can live with
20071221, I would stick with that. From your problem description, I would
definitely suspect problem #1 above.
Can anyone tell me what has changed from:
avr-gcc (GCC) 4.1.2 (WinAVR 20070525rc2)
avr-gcc (WinAVR 20080430) 4.3.0
I recompiled code for a working product using 4.1.2 with 4.3.0 and it
longer works correctly.
Fairly complex product so trying to localize the problem would not be
that much fun, without some insights as to what might be
The unit has a bit mapped display. With 4.3.0 I have random
that I don't have with 4.1.2, which probably indicates that I
something marginal in my display driver timing. When I assert
the unit eventually locks up with 4.3.0, but not with 4.1.2.
All rather vague descriptions, I know...
RAM and EEPROM usage remained the same, code size
grew by 516 bytes going from 4.1.2 to 4.3.0.
RE: [avr-gcc-list] What has changed between WinAVR 20070525rc2 andWinAVR 20080430?,
Stu Bell <=