irq_usart.s

ATMEL的ADS例子1

;------------------------------------------------------------------------------
;-         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_usart.s
;- Object               : Assembler Usart Interrupt Handler.
;-
;- 1.0 14/Feb/03 JPP     : Creation
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
;- Area Definition
;------------------------------------------------------------------------------
	AREA        itHandler, CODE, READONLY

		INCLUDE		include/AT91M42800A.inc

    INCLUDE   irq_arm.mac


;------------------------------------------------------------------------------
;- Function             : usart_asm_irq_handler
;- Treatments           : USART Controller Interrupt Handler.
;- Called Functions     : Usart_c_irq_handler
;- Called Macros        : IRQ_ENTRY, IRQ_EXIT
;------------------------------------------------------------------------------
	EXPORT usart_asm_irq_handler
	IMPORT Usart_c_irq_handler
usart_asm_irq_handler
;- Manage Exception Entry
        IRQ_ENTRY
;- Call the PIO Interrupt C handler
            ldr         r0, =AT91C_BASE_US1
            ldr         r1, =Usart_c_irq_handler
            mov         r14, pc
            bx          r1
;- Irq exit
exit_irq
;- Manage Exception Exit
        IRQ_EXIT

    END