TMS320F28379D: Nested interrupts

Dhammika Wijesundera

Intellectual 645 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hi,

I have two interrupt routines (ISRs) in my software. One is for EPWM7 and the other is for SCIA_RX.

I want to be able to jump to the EPWM7 ISR while the program is executing inside the SCIA_RX ISR.

Is that possible? If so, can you please show me the code for setting IER and PIEIER?

Thanks,

Dhammika

over 6 years ago

0 Whitney Dewey over 6 years ago

TI__Guru 54715 points

Yes, that's possible. Take a look at this wiki page for instructions on how to setup the interrupt masks: http://processors.wiki.ti.com/index.php/Interrupt_Nesting_on_C28x

There's also an example in C2000Ware under \device_support\f2837xd\examples\cpu1\sw_prioritized_interrupts

Whitney

0 Dhammika Wijesundera over 6 years ago in reply to Whitney Dewey

Intellectual 645 points

Hi Whitney,

EPWM7 interrupt is a PIEIER group 3 interrupt. SCIA_RX interrupt is a PIEIER group 9 interrupt.

If I follow the examples, I will be violating the red text in http://processors.wiki.ti.com/index.php/Interrupt_Nesting_on_C28x (or haven't I understood the example?).

Thanks,

Dhammika

0 Whitney Dewey over 6 years ago in reply to Dhammika Wijesundera

TI__Guru 54715 points

Since the interrupts you're interested in are in different groups you can skip the lines related to PIEIER. You only need to modify PIEIER when you're trying to nest/prioritize interrupts within the same group. You'll just need to modify IER.

Whitney

0 Dhammika Wijesundera over 6 years ago in reply to Whitney Dewey

Intellectual 645 points

Thanks Whitney.

Dhammika

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TMS320F28379D: Nested interrupts