TMS320F28374S: Usage of "reserved" interrupt vectors

wilson wilson

Part Number: TMS320F28374S

Hello,

Is it allowed to use interrupt vectors which are descriped as "reserved" in the correspointing PIE Interrupt Vector table?

For example to use interrupt vector INT12.4 (Group 12 channel 4)?

I want to trigger an interrupt from my application. For that I could use an interupt-vector deticated to a specific peripheral (this peripheral would be then blocked, since i use its interrupts channel for sth. else). Or I use a "reserved" channel which is not used by any peripheral so no peripheral loose its associated interrupt vector.

However, i am not sure what "reserved" in the interrupt vector table means (TRM p. 96 /102). Am I allowed to use that vector? Is it a user reserved vector?

Or does "reserved" states, that it is not recommended to use that channel since in the furture this channel might be used by TI. So this channel is TI reserved.

On my uC both ways work properly...

Does someone know a document which explains it further in detail what "reserved" means? Did not find anything in the TRM / internet

Best regards

wilson

over 2 years ago

0 Vince over 2 years ago

TI__Mastermind 19795 points

Hi Wilson,

Thanks for your question.

wilson wilson said:
Or does "reserved" states, that it is not recommended to use that channel since in the furture this channel might be used by TI.

This is often the case, where other devices in a family will have interrupts located in those locations.

Is there any hesitation to just use a normal function call instead of an interrupt? That may actually be the easiest way to implement what you are desiring to do.

Regards,

Vince

0 Vince over 2 years ago in reply to Vince

TI__Mastermind 19795 points

One additional note:

These threads address the use of these "reserved" interrupts in general.

Though you can technically use reserved interrupts, if you want software to be "re-used" amongst several C2000 devices, you should expect that those "reserved" interrupts may get used by another C2000 device for an actual interrupt. So basically, you may end up with software incompatibility due to using one of these reserved interrupts.

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/591343/gpio-interrupt-on-piccolo-f28027f-in-simulink

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/454869/c2000-tms320f28335-unused-interrupts

Regards,

Vince

0 wilson wilson over 2 years ago in reply to Vince

Prodigy 20 points

Hallo Vince,

Thanks for your reply. The reason why I do not want to do a normal function call is, that the ISR is nested and serves as a control routine which needs to be priorizited globally and within its PIE-group.

So if I do not change the uC and stick to TMS32028374S the reserved vectors can be used.

Can I be sure that in the future this very same product will not use this vector for anything else? Further no changes in the hardware layout will eliminate this vector?

Best regards

wilson

0 Vince over 2 years ago in reply to wilson wilson

TI__Mastermind 19795 points

Hi Wilson,

The TMS32028374S should maintain its existing reserved vectors in future production, this device has been fully released and no further changes or fixes will occur.

The vector will also not disappear due to any hardware changes (there are no hardware changes planned to occur for this device).

Regards,

Vince

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TMS320F28374S: Usage of "reserved" interrupt vectors