TMS320F280025: How to enable FPU mode really?

Lu Hang

Part Number: TMS320F280025

Dear expert:

I am using TMS320F280025.I open fpu mode by changing settings in Properties as following:

However,after I compile the projects,there are lots of performance advice to remind me to changedoubles to floats for improved performance in FPU32-mode. The description as following:

The code where advice takes place is as following:

I have once tried to add IQmath and FPU32_eabi to projects:

I wonder that whether I missed some steps and I also wonder that whether the IQmath_fpu32 and rts2800_fpu32 could meet the requirements of the advice?

over 4 years ago

0 Shanty over 4 years ago

TI__Expert 5410 points

Hi,

Please add "F" suffix to all float constants. For example, if you have 2.0 * var, please update that to 2.0F. The EABI compiler will treat 2.0 as 64 bit float constant and uses 64 bit floating operations, Since this device does not have FPU64 accelerator, these operations will be time consuming. Adding the "F" suffix makes the compiler treat 2.0 as 32-bit float.

Please refer to this thread: https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/987535/tms320f28379d-coff-to-eabi-project-with-stdlib-h-included-double-to-float-conversion

Hope this helps.

-Shantanu

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280025: How to enable FPU mode really?