TMS320F28379D: CCS

Mohammad Irfan

Prodigy 110 points

Part Number: TMS320F28379D

Tool/software:

Hi everyone,

I hope you're doing well.

I have a few questions regarding the **interrupt_ex1_external** example and would really appreciate your insights:

1. Why is the letter **L** used with floating-point numbers when it is typically associated with integers?
2. Why are global variables declared with the **volatile** keyword?

I have attached a screenshot for reference. Looking forward to your valuable explanations.

Thank you in advance.

Best Regards,

Sameer

7 months ago

+1 Ozino Odharo 7 months ago

TI__Mastermind 20672 points

Hi Sameer,

So the "L" after the number is used to indicate Float Point Literal. In this case, it is used to represent an float constant, L suffix specifies a float type.

The term 'volatile' is to provide a hint to the compiler not to make certain assumptions about a variable. The volatile keyword must be used when accessing memory locations that represent memory mapped peripherals. C2000 Optimization Guide

Check out this forum post for more information on volatile use cases:

https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/3415/multi-threading-and-global-variables---volatile-keyword-required

Regards,
Ozino

0 Mohammad Irfan 7 months ago in reply to Ozino Odharo

Prodigy 110 points

Hi Ozino,

Thanks for your guidance.

Best regards,

Sameer

0 Ozino Odharo 7 months ago in reply to Mohammad Irfan

TI__Mastermind 20672 points

Hi Sameer,

Glad to hear the suggestion answered your question. Thank you for the feedback. All the best with your development efforts!

Regards,

Ozino

C2000™︎ microcontrollers

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TMS320F28379D: CCS