irq_timer.s

arm9 9200 time 中断 程序

;定时器中断汇编入口
;- File source          : irq_timer.s
;- Object               : Assembler timer Interrupt Handler.
;-
;- 1.0 14/Feb/03 JPP     : Creation
;------------------------------------------------------------------------------

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

		INCLUDE		include/AT91RM9200.inc
		
	

    	INCLUDE   drv/irq_arm.mac


;------------------------------------------------------------------------------
;- Function             : timer0_asm_irq_handler
;- Treatments           : Timer 0 interrupt handler.
;- Called Functions     : timer_c_irq_handler
;- Called Macros        : IRQ_ENTRY, IRQ_EXIT
;------------------------------------------------------------------------------
			EXPORT timer0_asm_irq_handler
			IMPORT timer0_c_irq_handler	;通用定时器服务C函数
timer0_asm_irq_handler					;定时器0汇编入口句柄

;- Manage Exception Entry
 	       IRQ_ENTRY
 	       ;STMFD   SP!,{R0-R3,R12,LR}
;===============================================

;===============================================
;===============================================
;- Call the timer Interrupt C handler
;		    ldr         r0, =AT91C_BASE_TC0	;定时器指针
            ldr         r1, =timer0_c_irq_handler
            mov         r14, pc
            bx          r1            
;- Irq exit
;- Manage Exception Exit
			;LDMFD   SP!,{R0-R3,R12,LR}
        	;SUBS    PC,LR,#4
			IRQ_EXIT
;===============================================

;===============================================

;===============================================
;===============================================        
;            b			exit_irq
;------------------------------------------------------------------------------
;- Function             : timer1_asm_irq_handler
;- Treatments           : Timer 1 interrupt handler.
;- Called Functions     : timer1_c_irq_handler
;- Called Macros        : IRQ_ENTRY, IRQ_EXIT
;------------------------------------------------------------------------------
            EXPORT      timer1_asm_irq_handler
            IMPORT      timer1_c_irq_handler
timer1_asm_irq_handler					;定时器1汇编入口句柄

;- Manage Exception Entry
        IRQ_ENTRY

;- Call the timer Interrupt C handler
;		    ldr         r0, =AT91C_BASE_TC1
            ldr         r1, =timer1_c_irq_handler
            mov         r14, pc
            bx          r1
exit_irq
;- Manage Exception Exit
            IRQ_EXIT

            END