S12 / MagniV MicrocontrollersのトピックRe: Warning message received while trying to allocate variable at specified address

Warning message received while trying to allocate variable at specified address

Xbot — Mon, 02 Jun 2008 16:11:18 GMT

Hi all,

I received a warning while trying to allocate a variable at this address :

"failed to convert address 0xBEA01 of IllegalAddress because of Flash area (C000..FFFF) is not paged"

my code goes like this:

---> unsigned long IllegalAddress @780801;

where did 0xBEA01 came from?

what i want to happen is move a value to that address in a push of a button.

thanks,

Re: Warning message received while trying to allocate variable at specified address

ang — Mon, 02 Jun 2008 16:43:17 GMT

0xBEA01 is the hex value of the address (780801)you have mentioned. it may not be a valid address of the micro which you are using

Regards

Ang

Re: Warning message received while trying to allocate variable at specified address

Xbot — Mon, 02 Jun 2008 16:50:27 GMT

hahaha my bad... still i got a warning tho. Is my declaration correct?

Re: Warning message received while trying to allocate variable at specified address

ang — Mon, 02 Jun 2008 16:54:29 GMT

i think the declaration is correct. but the address may be wrong.

Re: Warning message received while trying to allocate variable at specified address

Xbot — Mon, 02 Jun 2008 19:18:00 GMT

any other suggestions?

i just want to point to a memory address so i can simulate an access violation interrupt.

Re: Warning message received while trying to allocate variable at specified address

CrasyCat — Mon, 02 Jun 2008 20:42:39 GMT

Hello

Addresses specified after the @ modifier are always logical addresses.

You cannot specify a global address here.

CrasyCat

Re: Warning message received while trying to allocate variable at specified address

Xbot — Tue, 03 Jun 2008 20:08:12 GMT

ok, so how do i instead point to an address say the flash area?

My code will point to an address(maybe write a value in it) to simulate an access violation in a press of a button.

for(;{

    if (!(PORTB&0x10)){      // PUSH PTB4 button
      *far farptr = 0x780000;
    }

...

my accessviolation ISR here:

Re: Warning message received while trying to allocate variable at specified address

JimDon — Tue, 03 Jun 2008 20:14:16 GMT

Well, I don't know if if CW will set up the page registers correctly, but the syntax would be:

*((far char*) 0x780000) = 0;

This would work on a normal flat address space (i.e 32 bit) machine.

Re: Warning message received while trying to allocate variable at specified address

Xbot — Tue, 03 Jun 2008 20:33:07 GMT

Hello Jim,

Tried you code. I cant seem to verify if location 780000 had been cleared. From your syntax was it clearing address 780000?

any other suggestions from my problem?

Re: Warning message received while trying to allocate variable at specified address

CrasyCat — Fri, 06 Jun 2008 16:06:05 GMT

Hello

I tried

*(( char *far) 0x780000) = 0x0;

and it did clear global address 0x780000.

To look at global address 0x780000 in memory window:

- Click with the right mouse button inside of the Memory window

- In the drop down menu select Address

- In the edit box enter 780000'G

This should display memory starting at address 0x780000 in global address space.

CrasyCat