TMS320F28379D: F28379D interrupt Priority

electrocc

Hi,

In my software, I'm using 2 interrupts, one with a Timer (Timer0), and one with the SPI (FIFO interrupt).
Concerning the priority of these interrupt, Timer0 has the highest priority?
So normally, to start, SPI interrupt has to wait that Timer0 interrupt is finished?
And if we're executing SPI interrupt and Timer0 interrupt happen, we stop SPI interrupt and start Timer interrupt execution?

Because in my case, SPI interrupt start at the end of the Timer0 interrupt, so it's fine. But SPI interrupt doesn't stop when Timer0 interrupt happens.
It's not ok?

Before sending you my code, first I need to understand how interrupt priority work.

Thank you.

Regards

over 6 years ago

0 Frank Ankapong over 6 years ago

TI__Mastermind 28275 points

Hi Electrocc,

Interrupting an interrupt is "Interrupt Nesting". C28x devices don't support hardware interrupt nesting but you can achieve some form of interrupt nesting through software. Please look at the "Nesting Interrupts" chapter in the TRM.

In addition, you can read section "3.4.5.1 PIE Interrupt Priority" of the TRM (http://www.ti.com/lit/ug/spruii0a/spruii0a.pdf) to better understand how the priority works. This section is currently not in the F28379D TRM but will be added. The concept however is the same.

0 electrocc over 6 years ago in reply to Frank Ankapong

Expert 2450 points

Hi Franck,

Thank you for your answer.

Regards

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TMS320F28379D: F28379D interrupt Priority