Compiler/TMS320F28069: Bitfield manupulation generates MISRA C error 10.1

Shadab Shaikh1

Tool/software: TI C/C++ Compiler

Hi,

I enabled the MISRA C 2004 check from project properties and trying to make my motor control as comliant to MISRA C as possible.

Whenever i access a bitfield in the following format i get MISRA C warning.

GpioDataRegs.GPATOGGLE.bit.GPIO18=1;

'Description	Resource	Path	Location	Type
#1393-D (MISRA-C:2004 10.1/R) The value of an expression of integer type shall not be implicitly converted to a different underlying type if it is not a conversion to a wider integer type of the same signedness	main.c	/FOC	line 213	C/C++ Problem
'

How to avoid this warning?

Regards,

Shadab

over 6 years ago

0 AartiG over 6 years ago

TI__Guru**** 173310 points

If you are referring to MISRA warnings being generated on TI provided header files/related code, then yes they are not MISRA compliant and we do not have any plans to make them fully compliant. Depending on your requirement, you would need to modify the source code. Also some rules are mandatory, optional or case-by case.

Please see these related threads and document for reference.

https://e2e.ti.com/support/microcontrollers/c2000/f/171/p/524447/1907547#1907547

http://www.ti.com/lit/spracb3

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/783266

0 Keith Barkley over 6 years ago

Guru 42725 points

Of course, you *are* assigning an int to a bit, so the warning is valid. I don't even see any way to do a cast to shut it up. You might try true or false, which is allowed in C99.

You might try creating a constant bit field and assigning that, but that gets into doing something silly just to shut up a warning.

0 Shadab Shaikh1 over 6 years ago in reply to Keith Barkley

Prodigy 100 points

I tried the following:

GpioDataRegs.GPATOGGLE.bit.GPIO18=1u; /*added 'u' after one the warning is gone */

Is this valid? Will it affect the functionality of the code in any way?

0 George Mock over 6 years ago in reply to Shadab Shaikh1

TI__Guru**** 252680 points

Shadab Shaikh1 said:
Is this valid?

Yes

Shadab Shaikh1 said:
Will it affect the functionality of the code in any way?

Thanks and regards,

-George

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Compiler/TMS320F28069: Bitfield manupulation generates MISRA C error 10.1