There are only 60 maskable interrupts in the STM32F103 series (68 in the 107 series).
Interrupt management method
First, group the STM32 interrupts into groups 0 to 4. At the same time, set a preemption priority and a response priority value for each interrupt.
The group configuration is configured in register SCB->AIRCR:
A high-priority preemption priority can interrupt an ongoing low-priority preemption interrupt.
Preempt interrupts with the same priority level. Interrupts with higher priority levels cannot interrupt interrupts with lower priority levels.
Preempt interrupts with the same priority. When two interrupts occur at the same time, the one with a higher response priority will be executed first.
If the preemption priority and response priority of two interrupts are the same, the interrupt that occurs first will be executed first.
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