TMS320F28335: FPU exceptions

Ming Ma1

Any FPU exception will be raised for an NaN (Not a number) feed to FPU in TMS320F28335?

Also, where may I find the list of FPU exceptions such as inexact, divisor zero etc? There is no FPU exception list in the datasheet though.

over 6 years ago

0 MatthewPate over 6 years ago

TI__Guru* 83740 points

Ming,

I think the FPU primer will be of help here; http://www.ti.com/lit/spraan9

NaN is treated as infinity on the C28x FPU, and I don't believe there are input exceptions; only if the output of a calculation cannot be represented will the LVF or LUF get generated.

I've asked some others in the team who are more well versed in the FPU to check this as well, but wanted to get the conversation started before the weekend.

Best,

Matthew

0 Sira Rao80 over 6 years ago in reply to MatthewPate

TI__Mastermind 27385 points

Ming,

Please see section J.3.6 of spru514s. Looks like the compiler doesn't support any additional float exceptions than those that are defined as part of the C language standard.

Thanks,

Sira

0 Ming Ma1 over 6 years ago in reply to Sira Rao80

Prodigy 50 points

Thanks, Sira,

I used probe to reach the same conclusions.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28335: FPU exceptions