Try this first:
volatile int i;
int main()
{
while(1)
{
i++;
}
}
IMHO you are chasing a dead horse because the optimizer is removing code
that doesn't do anything. Inside main, the scope of the variable is limited
to main so volatile probably doesn't mean anything.
At 14:16 20-2-2010 -0700, Carl wrote:
>If I declare it as a global it is where I expect at the beginning of RAM
>(0x1100). But if it is on the stack in the main function, even if I
>declare it volatile, use asm(""); // __asm__ __volatile__ (""); or pass
>it to a function, the variable address is in flash at 0x3102. It doesn't
>make sense.
>
>Now if I use the program:
>
>#include <io.h>
>
>int f1()
>{
> volatile int i = 5;
> i += 2;
> return i;
>}
>
>int main()
>{
> while(1)
> {
> f1();
> }
>}
>
>The variable i address is on the stack in RAM at 0x30f8 which makes
>sense. But if I change the compile option to use -02. Then the function
>stack variable, i, goes back to being located in flash at 0x3102. And
>it's value is not initialed to 5 nor is 2 added to it. The value of i is
>constant = 12544 (0x3100.)
>
>I noticed at new version of mspgcc4 is out as of Feb 18, 2010. I've
>tried to install it on both a Fedora 9 and a Ubuntu machine but get the
>same error:
>
>Failed to execute sh do-gcc.sh "/opt/msp430-gcc-4.4.3" "4.4.3"
>"http://ftp.uni-kl.de"; "build" "gcc-4.x" "4.3.1" "2.4.1"
>at ./buildgcc.pl line 237, <STDIN> line 9.
>
>
>Carl
>
>
>
>On Sat, 2010-02-20 at 09:08 +0100, N. Coesel wrote:
>> Carl,
>>
>> Try to declare it outside the function (as a global).
>>
>> At 19:43 19-2-2010 -0800, you wrote:
>> >I tried declaring as volatile and it is at the exact same address.
>> >
>> >Carl
>> >
>> >On Sat, 20 Feb 2010 01:35:03 +0000
>> > "Wayne Uroda" <[email protected]> wrote:
>> >>try declaring i as volatile, or the compiler will probably get rid of it
>> since it has no effect or side-effect.
>> >>Sent via BlackBerry from Vodafone
>> >>
>> >>-----Original Message-----
>> >>From: Carl <[email protected]>
>> >>Date: Fri, 19 Feb 2010 18:29:03
>> >>To: <[email protected]>
>> >>Subject: [Mspgcc-users] stack variable in flash?
>> >>
>> >>I'm sure that I'm missing some basic here but I'm not sure what. The
>> >>first variable on the stack is in an unexpected location. I would expect
>> >>it to be located somewhere on the stack in RAM (0x30ff-0x1100) but it is
>> >>located in flash memory and it does not get set or incremented.
>> >>
>> >>
>> >>#include <io.h>
>> >>
>> >>int main()
>> >>{
>> >> int i=0;
>> >> while(1)
>> >> i++;
>> >>}
>> >>
>> >
>
>
>
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