Example B.10. Vectored interrupt initialization

       LDR    r0, =IntCntlBase

       MOV    r1, #<interrupt_to_enable>

       STR    r1, [r0, #IntEnableClearOffset]                ;  Disable interrupt

       LDR    r2, =default_vector_address                    ;  Set default vector address

       STR    r2, [r0, #DefaultVectorAddressOffset]          ;  Setup and enable vectored interrupt 15

       MOV    r2, #vector_address                            ;  Set vector address

       STR    r2, [r0, #VectorAddr15Offset]

       MOV    r2, #interrupt_source                          ;  Set interrupt source

       ORR    r2, r2, #0x20                                  ;  and enabled vector interrupt

       STR    r2, [r0, #VectorCntl15Offset]

       LDR    r2, [r0, #IntSelectOffset]                     ;  Select IRQ interrupt

       BIC    r2, r2, r1

       STR    r2, [r0, #IntSelectOffset]

       STR    r1, [r0, #IntEnableOffset]                     ;  Enable interrupt

       MRS    CPSR_c, #(DISABLE_IRQ + MODE_SYS_32)           ;  Enable FIQ interrupts