ext_irq_handler.s

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

;------------------------------------------------------------------------------
;-         ATMEL Microcontroller Software Support  -  ROUSSET  -
;------------------------------------------------------------------------------
; The software is delivered "AS IS" without warranty or condition of any
; kind, either express, implied or statutory. This includes without
; limitation any warranty or condition with respect to merchantability or
; fitness for any particular purpose, or against the infringements of
; intellectual property rights of others.
;------------------------------------------------------------------------------
;- File source          : ext_irq_handler.s
;- Object               : Assembler External IRQ Interrupt Handler.
;-
;- 1.0 11/07/01 JCZ     : Creation
;------------------------------------------------------------------------------

            AREA        IrqExt, CODE, READONLY, INTERWORK

            INCLUDE     periph/aic/irq.mac

            IMPORT      ext_irq_c_handler

;------------------------------------------------------------------------------
;- Function             : ext_asm_irq_handler
;- Treatments           : External IRQ Interrupt Handler
;- Called Functions     : None
;- Called Macros        : IRQ_ENTRY, IRQ_EXIT
;------------------------------------------------------------------------------
            EXPORT      ext_irq_asm_handler

ext_irq_asm_handler

;- Manage Exception Entry
        IRQ_ENTRY


;- Call the External Interrupt C handler
            ldr         r0, =ext_irq_c_handler
            mov         r14, pc
            bx          r0

;- Manage Exception Exit
            IRQ_EXIT    

            END