Compiler/MSP430F1121: nop()

Nicole Ward

Part Number: MSP430F1121

Tool/software: TI C/C++ Compiler

I'm trying to port some code that was compiled with mspgcc compiler to now using CCS v8. The existing code was able to resolve nop(). Does CCS have something equivalent that can be used to replace the nop() function. The nop() has been used as a critical part of the pre existing code. Error message shown below.

Compilation failure
makefile:141: recipe for target 'Test.out' failed
symbol in file
--------- ----------------
nop ./main.obj

error #10234-D: unresolved symbols remain
error #10010: errors encountered during linking; "Test.out" not built
gmake[1]: *** [Test.out] Error 1
gmake: *** [all] Error 2
makefile:137: recipe for target 'all' failed

**** Build Finished ****

over 8 years ago

0 Mike Tooma over 8 years ago

Genius 3255 points

Is the nop() in the original context used as a delay? If so, can you estimate the delay? if so, you should be able easily resolve this.

0 Nicole Ward over 8 years ago in reply to Mike Tooma

Intellectual 300 points

Hi Mike,

How do I resolve it easily? Is there another command that I can use as a delay?i'm trying to get 10s to 100s of milliseconds of delay. Also will I need to modify all the code that has used nop in the past? Is there a way to avoid that? I ask because there are many different applications that this has been used for.

Thanks,
Nicole

0 Mike Tooma over 8 years ago in reply to Nicole Ward

Genius 3255 points

You can use the "__delay_cycles()" intrinsic. For example, if your MCLK is 1MHz and you do "__delay_cycles(1000)", you will get a 1ms delay.
In your case, you could wrap the "__delay_cycles()" in a "nop()" function as long as you count for the cycles it will take to call the function and return from it.

0 Nicole Ward over 8 years ago in reply to Mike Tooma

Intellectual 300 points

Thanks Mike, I'll try it.

Nicole

0 Nicole Ward over 8 years ago in reply to Mike Tooma

Intellectual 300 points

Hi Mike,
With this change I was able to get the code to compile. Now I just need to determine if the time is equivalent to the nop() command that was used previously. Thanks for your help in getting this built.

Best Regards,
Nicole

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Compiler/MSP430F1121: nop()