URL:
<http://savannah.nongnu.org/bugs/?30085>
Summary: memcpy_P on XMega does not clr NVM.CMD before copy
Project: AVR C Runtime Library
Submitted by: joebauer
Submitted on: Di 08 Jun 2010 15:45:48 GMT
Category: Library
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: libc code
Status: None
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Release: 1.6.7
Fixed Release: None
_______________________________________________________
Details:
Hi there,
I've had some trouble today with the XMega. I used memcpy_P, which usually
worked just fine, except for a certain part of my code where it suddenly
produced garbled output. Tracing the source of the problem I noticed that on
the ATxmega I use the NVM.CMD register and set it to reading the calibration
row (0x02). However, since I did not return it to NOP (0x00), subsequent calls
to memcpy_P lead to a wrong result, since the behaviour of lpm has changed
with a changed NVM.CMD.
I suggest on the XMega to set NVM.CMD to zero in the beginning of memcpy or
include this in the docs, as it might cost someone else roughly a day in
debugging time :-/
Regards,
Johannes
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