The interrupt vector of STM32 has two attributes, one is the preemption attribute and the other is the response attribute.
The smaller the attribute number, the higher its priority level.
Preemption refers to the attribute of interrupting other interrupts. That is, because of this attribute, nested interrupts will occur
(interrupt B is interrupted during the execution of interrupt service function A, and interrupt service function A continues to be
executed after interrupt service function B is executed). The preemption attribute is configured by
the parameters .
The response attribute is applied when the preemption attribute is the same. When the preemption priority of two interrupt vectors
is the same, if two interrupts arrive at the same time, the interrupt with higher response priority will be processed first. The response attribute
is configured by the parameters of NVIC_IRQChannelSubPriority.
For example, there are three interrupt vectors:
Interrupt vector Preemption priority Response priority
A 0 0
B 1 0
C 1 1
If the kernel is executing the interrupt service function of C, it can be
interrupted by Since B and C have the same preemption priority, C cannot be interrupted by B. However, if interrupts B and C
arrive at the same time, the kernel will first respond to interrupt B with a higher priority.
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