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The following are the steps that would be carried out by a non-nested ISR: push all registers that are used (according to the ARM-Procedure-Call Standard) on to the stack, determine the interrupt source by reading the INT_VECTOR register, and execute the ISR. Pop all saved registers back from the stack. Finally, end the ISR by restoring the Program Counter register (PC). Now consider the extra steps needed for nested routines. After finding the interrupt source, raise the priority-masking threshold to the priority level of the interrupt request to be served and re-enable interrupts in the processor. From this point, only interrupt sources with a higher priority level than the current interrupt source can interrupt the core. Then, execute the ISR. After completion, restore the saved priority mask and follow the remaining steps.
PTM Published on: 2011-11-02
