What is interrupt priority

Interrupt priority refers to the order in which interrupt requests should be processed when multiple interrupt requests occur at the same time. When multiple interrupt requests arrive at the same time, the system needs to determine which interrupt to process first based on the interrupt priority.

Interrupt priority refers to the order in which interrupt requests should be processed when multiple interrupt requests occur at the same time. When multiple interrupt requests arrive at the same time, the system needs to determine which interrupt to process first based on the interrupt priority.

Interrupt priority is usually set by hardware or software. In hardware priority, each interrupt signal line has a corresponding hardware interrupt priority, and interrupt requests with high priority will be responded to first. In software prioritization, the operating system or program sets the priority of interrupts programmatically.

Priority can be set based on different factors such as urgency, importance, or time sensitivity. Normally, interrupt requests with higher priority interrupt the executing program and are processed immediately. An interrupt request with a lower priority may need to wait for the currently processed interrupt request to complete before it can be processed.

The correct setting of interrupt priority is very important for the response performance and stability of the system. High-priority interrupts are usually used to handle emergency situations, such as hardware errors, clock interrupts, etc., while low-priority interrupts may be used to handle some more routine tasks or peripheral inputs.

It should be noted that when setting the interrupt priority, you need to balance the relationship between different interrupts to avoid unreasonable priority settings that cause some interrupts to not be processed for a long time or starved. At the same time, certain rules and architectural constraints must be followed to ensure the reliability and maintainability of the system.

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