Comparing two variables in different ram pages

lucianopalacios — Thu, 29 Nov 2012 12:56:04 GMT

Hello,

for my project with MC9S12XF512, I'm trying to compare two variables which are in different ram pages. When I debug it I can see in Data window that the value of both variables are equal but the comparison results false.

Here a code example of this problem

#pragma DATA_SEG PAGED_RAM

uint8 variable1 = 0xff;

#pragma DATA_SEG DEFAULT

uint8 variable2 = 0xff;

void main(void)

{

volatile uint8 aux = 0;

while(1)

{

if( variable1 == variable2 )

{

aux = 1;

}

else

{

aux = 2;

}

The result is always "aux = 2". What would be the right way to compare these variables?

Many thanks in advance.

Best regards

Re: Comparing two variables in different ram pages

lucianopalacios — Thu, 29 Nov 2012 14:16:35 GMT

I read AN3784 and I have to do the following:

Variables in Banked RAM

Before accessing a banked RAM location, the compiler needs to insert instructions that write an appropriate

value into the RPAGE register. The syntax to instruct the compiler to do this is:

#pragma DATA_SEG __RPAGE_SEG PAGED_RAM

I tried with this correction and it's working now.

Regards

S12 / MagniV MicrocontrollersのトピックRe: Comparing two variables in different ram pages

Comparing two variables in different ram pages

Re: Comparing two variables in different ram pages