Variables in {$DATA} area

Marco

Benutzer

Gender: n/a
Location: Italy
Posts: 270
Registered: 10 / 2004

Subject:

Variables in {$DATA} area

· Posted: 20.12.2012 - 21:23 · #1

Hello,

I have defined a byte variable in {$DATA} area and an INC(var) instruction in the main.
It compile without error, but at runtimes the inc() instruction seems ignored...
Only a direct assignment var:=1; seems work...

Moving the var declaration into {$IDATA} solved the problem.

Is it still available in xMegas some {$DATA} memory space ?

Regards,
Marco

Administrator

Gender:
Location: Germany
Age: 24
Homepage: e-lab.de
Posts: 5558
Registered: 03 / 2002

Subject:

Re: Variables in {$DATA} area

· Posted: 21.12.2012 - 00:01 · #2

Hello Marco,

while $DATA (Registerspace) is in the linear address room for all AVRs
the Registerspace of the XMegas is completely separate.
For example the registers can be reached with LDS and STS with AVRs
this is not possible with XMegas. So some standard operations will not
work with XMegas. Here $DATA should be avoided, except ASM is used.

rolf

Marco

Benutzer

Gender: n/a
Location: Italy
Posts: 270
Registered: 10 / 2004

Subject:

Re: Variables in {$DATA} area

· Posted: 23.12.2012 - 13:07 · #3

Ok, I suspected something like this, but not sure because I expected an error or warning at compile time...

Happy Christmas !

Marco

Administrator

Gender:
Location: Germany
Age: 24
Homepage: e-lab.de
Posts: 5558
Registered: 03 / 2002

Subject:

Re: Variables in {$DATA} area

· Posted: 23.12.2012 - 16:00 · #4

Hello Marco,

INC and DEC of DATA vars should work now in next update.

rolf

Variables in {$DATA} area

with xMegas

Variables in {$DATA} area

Re: Variables in {$DATA} area

Re: Variables in {$DATA} area

Re: Variables in {$DATA} area

Registered users in this topic