__delay_cycles

460822

During a compile, Code Composer 5 displays this message "Detected SW delay loop using __delay_cycles. Recommend using a timer module instead". Is there a problem using delay_cycles? Is there an alternate single line command to replace this?

over 12 years ago

0 tml over 12 years ago

Expert 1140 points

See here: http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/18638.aspx

0 Katie Pier over 12 years ago

TI__Guru 73326 points

Hi,

This is a message provided by ULP Advisor rather than a compiler warning - this is why I think it will show up under "Advice" instead of under "Problems" in CCS.

There is nothing wrong with using __delay_cycles (it will definitely work) - the advice given by ULP advisor is just there to try to provide tips on how you can optimize your code for low power operation since this is usually a key care-about for MSP430 users. It suggests using a timer because this allows you to go to low power mode during the delay, saving you power. But it is not necessary to use the timer if it makes more sense to just use delay cycles in your application (you may be timer limited, not care about power in this case, or prefer the simplicity).

You may want to see this forum post: http://e2e.ti.com/support/microcontrollers/msp430/f/166/p/264816/925804.aspx#925804

And there is more information about ULP Advisor here: http://processors.wiki.ti.com/index.php/ULP_Advisor?DCMP=MSP430&HQS=Other+OT+ulpadvisor

Regards,

Katie

0 460822 over 12 years ago in reply to Katie Pier

Genius 4055 points

Thanks for the clarification Katie.

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__delay_cycles