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RTOS/TMS320F28075: Hwi pre-emption enabling

Part Number: TMS320F28075


Tool/software: TI-RTOS

Hi,

I'm developing an application using SYS/BIOS.

I've two hardware interrupts (Hwi), TIMER0_HWI e USB_HWI. I need that USB_HWI can be pre-empted by TIMER0_HWI.

I've seen that in Hwi-Instance Settings page in CCS6 there's the option "MaskingOption_BITMASK". This option lets configure two masks: "Nested interrupt disable mask" and "Nested interrupt restore mask".

I haven't understood the meaning of those masks and how to use them.

Is there any document or example that explains what those masks mean and how to configure that masks?

Thank you.

Best regards,

Demis