Are the functions of the interrupt flag and interrupt pending flag repeated in the interrupt handling mechanism of the STM32 microcontroller?

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Are the functions of the interrupt flag and interrupt pending flag repeated in the interrupt handling mechanism of the STM32 microcontroller? [Copy link]

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In the interrupt handling mechanism of the STM32 microcontroller, are the functions of the interrupt flag bit and the interrupt pending flag bit repeated?

maychang

I haven't checked the datasheet, but I don't think it will be repeated. You can rest assured that the MCU hardware designers will not cause trouble for themselves.

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maychang posted on 2021-8-6 14:52 I didn't check the datasheet, but I guess it won't be repeated. MCU hardware designers won't ask for trouble, so you can rest assured.

Thanks.

chunyang

The interrupt flag is a prerequisite for the generation of an interrupt, and the interrupt pending flag indicates that an interrupt is interrupted by a higher priority interrupt. This flag not only allows you to know this state, but also is a prerequisite for ensuring that the interrupt service routine with higher priority can return to the interrupted interrupt service routine after execution. Obviously, the two are completely different concepts, each with its own meaning and function.

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chunyang posted on 2021-8-6 18:55 The interrupt flag is a prerequisite for the interrupt to be generated, and the interrupt pending flag indicates that an interrupt is interrupted by a higher priority interrupt. With this flag, you can not only know this...

Thank you very much. Does the interrupt pending flag have any meaning to programmers? It seems that programmers don't need this flag?

chunyang

Shenzhen Xiaohua published on 2021-8-6 20:33 Thank you very much. Does the interrupt suspend flag have any meaning to programmers? It seems that programmers don’t need this flag?

It is often used in multi-task scheduling to provide more flexibility for programming.