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

interrupt_eb42
..............\ext_irq.c
..............\interrupt_eb42.c
..............\interrupt_eb42.ews
..............\interrupt_eb42.pjf
..............\interrupt_eb42_flash.pjf
..............\interrupt_timer.c
..............\irq_pio.s
..............\irq_timer.s

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