Compiler/TMS320F28377D: Why does the compiler warn"176-D expression has no effect "

Jack Jeff

Part Number: TMS320F28377D

Tool/software: TI C/C++ Compiler

Hi,

I am using TMS320F28377D, and when I try to assign EPWMReg.CMPA, it will warn the assignment has no effect.

The warning is for Line 1548 "EPwm9Regs.CMPA.bit.CMPA = EPWM_period - 1000", and EPWM_period is a macro definition equal to 2500.

The warning shows:"#176-D expression has no effect".

I want to know what's wrong with the assignment. Thanks.

Hope for reply.

over 6 years ago

0 Tomasz Kocon over 6 years ago

Guru 26200 points

Hello Jack,
there is something going on that the compiler cannot see.
Defining EPwm9Regs as volatile should suppress this warning.
It is just my guessing.

0 George Mock over 6 years ago

TI__Guru**** 249890 points

I am unable to reproduce that diagnostic. For the source file which gets that diagnostic, please follow the directions in the article How to Submit a Compiler Test Case.

Thanks and regards,

-George

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

TI__Guru**** 249890 points

Please submit the requested test case.

Thanks and regards,

-George

0 Jack Jeff over 6 years ago in reply to George Mock

Prodigy 150 points

Hi George,
Sorry for my late reply.
I have already figured out what's wrong , my colleague added a semicolon after the macro definition and that is the reason.
Thank you for your help.

0 Jack Jeff over 6 years ago in reply to Tomasz Kocon

Prodigy 150 points

Hi Tom,
Sorry for my late reply.
I have already figured out what's wrong , my colleague added a semicolon after the macro definition and that is the reason.
Thank you for your help.

0 Tomasz Kocon over 6 years ago in reply to Jack Jeff

Guru 26200 points

Glad you did.

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Compiler/TMS320F28377D: Why does the compiler warn"176-D expression has no effect "