CCS Display double floating point wrong for Stellaris micro-controller

Adam Levine1

Other Parts Discussed in Thread: LM3S3748, LM3S8962

I am using double precision values and although the end calculation looks correct (eventually converted to int) the watch window displays the double values incorrectly. It looks like the byte order is being interpreted incorrectly. IE: I have the value 4792.5 and in ascending order in memory it is: 0x00 0x00 0x00 0x00 0x80 0xB8 0xB2 0x40 However the watch window shows it as: 5.362857607874241e-315 Some trouble shooting shows this value as reverse byte order of above. As I said final calculation is correct so I believe compiler is fine and it is only a debug display problem. Is there a way to set up debug window for proper byte order? The processor I am using is the LM3S3748 and CCS.

over 14 years ago

0 desouza over 14 years ago

TI__Guru**** 171004 points

Hi,

I can reproduce this in my LM3S8962 development board. As you say, it seems an issue with endianess when reading data memory. I will investigate this further and possibly file a bug (or reply with the correct procedure).

Cheers,

Rafael

0 Adam Levine1 over 14 years ago in reply to desouza

Intellectual 350 points

Rafael,

Thank you for your quick response. I am looking forward to resolving this issue.

FYI I have also been assigned Service Request# 1-665601550

From:

Tim Love

MCU Applications

Texas Instruments

Semiconductor Technical Support

Just figured I'd mention it so you can coordinate and/or avoid duplicate work.

Regards,

Adam

0 Adam Levine1 over 14 years ago in reply to Adam Levine1

Intellectual 350 points

Rafael,

Any news on this issue?

I had high hopes for a quick resolution as you were able to reproduce the problem on your platform.

Regards,

Adam

0 desouza over 14 years ago in reply to Adam Levine1

TI__Guru**** 171004 points

Adam,

Sorry for the delay; I filed a critical bug today under the number Normal 0 false false false EN-US X-NONE X-NONE SDSCM00039488

Please check its status at the link SDOWP in my signature below.

Thanks for reporting this,

Rafael

0 Adam Levine1 over 14 years ago in reply to desouza

Intellectual 350 points

Rafael,

Thanks for the response.

I hope it is something quick and easy for them to solve.

Regards,

Adam

0 Adam Levine1 over 14 years ago in reply to desouza

Intellectual 350 points

Rafael,

Just checking in on this to see if anything is being done on it.

Did they development team accept this as a real problem?

If so, do they have an estimate of when a fix or work around can be expected?

I can't believe that I am the only one to run into this problem. Is it because CCS just started supporting the Stellaris platform?

Regards,

Adam

0 desouza over 14 years ago in reply to Adam Levine1

TI__Guru**** 171004 points

Adam,

Yes, the bug is already being looked at but a fix is not yet available. I will keep you posted on its progress, ok?

Sometimes bugs, no matter how obvious they appear to be, stay "hidden" for months and years until someone hits them. This seems to be the case, since Stellaris has been supported since CCSv4.1.0 but that is the first time we get this.

Again I apologize for the inconvenience,

Rafael

0 Adam Levine1 over 14 years ago in reply to desouza

Intellectual 350 points

Rafael,

Okay. I wanted to check in. I know you escalated it up and I wanted confirmation that it was accepted as a bug by the receiver.

I'll check in from time to time if I don't hear from you but I'll try and keep it below the threshold of harassment:)

Thanks,

Adam

0 Adam Levine1 over 14 years ago in reply to Adam Levine1

Intellectual 350 points

Rafael,

Checking in once again. It has been 4 months without a peep.

Are they going to address this problem or has it already been fixed and I was not informed?

0 desouza over 14 years ago in reply to Adam Levine1

TI__Guru**** 171004 points

Adam,

I checked the bug case and it is reported that a fix is available with versions 4.2.4 and 5.1 of CCS. You can download it from the CCS installations page below:

http://processors.wiki.ti.com/index.php/Download_CCS

If you prefer, you can even install the new release in a different directory and create a new workspace to prevent any disruptions to your current work - a useful thing if you are at a critical stage of your development.

Thanks again for reporting this issue,

Rafael

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CCS Display double floating point wrong for Stellaris micro-controller