irq_wd.s

来自「有关ATMEL AT91系列CPU的驱动函数库」· S 代码 · 共 57 行

#------------------------------------------------------------------------------
#-         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"

            .extern      SaveWDHandler

PtWDBase:
            .long        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
#------------------------------------------------------------------------------
            .global      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