irq_wd.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          : irq_wd.s
;- Object               : Assembler Watch Dog Interrupt Handler.
;-
;- 1.0 01/04/00 JCZ     : Creation
;- 1.1 02/11/00 JPP     : Green Hills
;------------------------------------------------------------------------------

            AREA        AT91Lib, CODE, READONLY, INTERWORK

            INCLUDE     ../../periph/aic/irq.mac
            INCLUDE     ../../periph/watchdog/wd.inc

            IMPORT      SaveWDHandler
PtWDBase
            DCD         0xFFFF8000

;------------------------------------------------------------------------------
;- Function             : at91_watch_dog_interrupt_handler
;- Treatments           : Watch Dog Interrupt Handler.
;- Input Parameters     : r14 = lr = interrupt instruction address + 4
;-                      : SPSR = CPSR when core interrupted
;- Output Parameters    : None
;- Registers lost       : None
;- Called Functions     : The interrupt handler saved in <SaveWDHandler>.
;- Called Macros        : IRQ_ENTRY, IRQ_EXIT
;------------------------------------------------------------------------------
            EXPORT      at91_watch_dog_interrupt_handler

at91_watch_dog_interrupt_handler

;-  Manage interrupt entry
            IRQ_ENTRY

;- Load the Watch Dog Base Address
            ldr         r0, PtWDBase

;- Branch on C Watch Dog Handler
            ldr         r1, =SaveWDHandler
            ldr         r1, [r1]
            mov         r14, pc
            bx          r1

;-  Manage interrupt exit
            IRQ_EXIT

            END