irq_wd.s

嵌入式系统开发用源代码 包含At91C arm芯片相关各种例程 包括整数性能测试,浮点测试,硬件驱动等

;------------------------------------------------------------------------------
;-    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.
;- Translator           : ARM Software Development Toolkit V2.11a
;-
;- Imported Resources   :
;-          SaveWDHandler, PtWDBase
;- Exported Resources   :
;-          watch_dog_interrupt_handler
;-
;- 1.0 JCZ 03/12/97     : Creation
;- 1.1 JCZ 15/09/98     : See irq.mac 1.1
;- 2.0 JCZ 21/10/98     : Clean up and add interworking capabilities
;------------------------------------------------------------------------------
; Function :
; This file allows to branch a C interrupt handler when a Watch Dog interrupt
; occurs. The address of the C handler is stored in the variable
; <SaveWDHandler> by the execution of the C function <init_watch_dog>.
;------------------------------------------------------------------------------

            AREA        AT91Lib, CODE, READONLY, INTERWORK

; -------------------------- List of Included Files ---------------------------

            INCLUDE     Include/arm.inc
            INCLUDE     Include/wd.inc
            INCLUDE     Include/aic.inc
            INCLUDE     Include/irq.mac

; ------------------------ List of constants and types ------------------------
; None

; ------------------------ List of Imported resources -------------------------

            IMPORT      SaveWDHandler

; ------------------------ List of Internal resources -------------------------
PtWDBase
            DCD         WD_BASE

; ------------------------ List of Exported resources -------------------------

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

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