topic Re: Storing variable in flash in CodeWarrior for MCU

Storing variable in flash

rmaier — Wed, 02 Nov 2016 02:31:35 GMT

Hello,

I'm using an MC9S12P128 MCU, and I'd like to store some constants in D-flash. I have the D-flash segment defined as

DFLASH = READ_ONLY 0x010400 TO 0x0113FF;

So, when I go to write the constant, I use the following:

#pragma CONST_SEG CAL_VAL
volatile const unsigned char __near constant1=0x7F;

When I look at where this is in the memory, it shows up as 0xC015. To me, that's nowhere in the range define above. What am I missing here?

Re: Storing variable in flash

ZhangJennie — Wed, 02 Nov 2016 03:30:17 GMT

Hi Robert.

I just made a quick test but I didn't reproduce your problem.

see attached demo code and video.

Have a great day,
Jennie Zhang

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Storing variable in flash

rmaier — Wed, 02 Nov 2016 03:46:57 GMT

I do not see any attachments. Can you please post?

Re: Storing variable in flash

rmaier — Wed, 02 Nov 2016 04:24:57 GMT

I hacked a solution. I defined constant1 in D-flash as follows:

const unsigned char constant1 @ 0x0400;

Then I can write to D-flash at this location, and all is well...

Re: Storing variable in flash

ZhangJennie — Wed, 02 Nov 2016 05:31:39 GMT

Can't you see it?

here is the screenshot of it

Re: Storing variable in flash

rmaier — Wed, 02 Nov 2016 15:44:46 GMT

Thank you, Jennie. The video was very helpful. I missed some items in the prm file.

Not sure how I missed the video. My appologies.