CCS/CCSTUDIO-C2000: Compile and memory barriers

Kien

Expert 3991 points

Part Number: CCSTUDIO-C2000

Tool/software: Code Composer Studio

Hi,

I need to implement Compile and Memory barriers for Delfino TMS320F28379D and Code Composer Studio.

Compile barrier: Explicit compiler barrier function that prevents the compiler from moving the memory accesses either side of it to the other side. In gcc, this is done using the asm volatile("":::"memory") instruction.
Memory barrier: Memory barrier to force strict CPU ordering and as boundary for compiler optimization. This is the same as the compile barrier for gcc, but on some devices are different.

So the question is how to do that in CCS?

over 8 years ago

0 George Mock over 8 years ago

TI__Guru**** 249380 points

There is no standard solution for creating barriers in the compiler. You can get most of what is typically required by taking two steps. Step one: Create a critical section by bounding it with the intrinsics __disable_interrupts and __restore_interrupts. Please read more about those intrinsics in the C2000 compiler manual. Step two: Make all the memory variables used in the critical section volatile.

Thanks and regards,

-George

0 Marco Paolo Florcruz over 8 years ago in reply to George Mock

Prodigy 10 points

Thanks George!

How about a way to disable optimization just for a block of code, or maybe at a function? It might be closer to what we have in mind.

- Marco

0 George Mock over 8 years ago in reply to Marco Paolo Florcruz

TI__Guru**** 249380 points

You can disable optimization for one function with this pragma ...

#pragma FUNCTION_OPTIONS(name_of_function, "--opt_level=off");

Please read more about that pragma in the C28x compiler manual.

Thanks and regards,

-George

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CCS/CCSTUDIO-C2000: Compile and memory barriers