This is the source of the interruption in the Embedded Development of ARM. I believe that it will be of great help to you. This is the ARM Embedded Development interrupted source, I believe you would be of considerable assistance

Packet : 117143197interrupt_eb42.rar filelist
interrupt_eb42\ext_irq.c
interrupt_eb42\interrupt_eb42.c
interrupt_eb42\interrupt_eb42.ews
interrupt_eb42\interrupt_eb42.pjf
interrupt_eb42\interrupt_eb42_flash.pjf
interrupt_eb42\interrupt_timer.c
interrupt_eb42\irq_pio.s
interrupt_eb42\irq_timer.s
interrupt_eb42

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