gfd_dma_int.s

tells you how to do the lab

 ;**************************************************************************************
 ;*
 ;*  (c) 2004 ASIC,all rights reserved
 ;*         
 ;*           
 ;*	This source code and any compilation or derivative thereof 
 ;*is proprietary information and is confidential in nature.
 ;*	Under no circumstance is this software to be exposed or placed
 ;*under an open source License of any type without expressed
 ;*written permission of ASIC.  
 ;*
 ;*filename:	HA_int_dma.s          
 ;*history:
 ;*
 ;*    Version         Date            Author            Comments
 ;*------------------------------------------------------------------------------------    
 ;*     1.0          2004.9.24           lmq             Initial Creation
 ;*     
 ;***************************************************************************************;
 
 
	AREA INT_GPT, CODE, READONLY                                                     
	       ENTRY                           ; Mark first instruction to execute 
	       
	include hardware_gfd.h
	       
	       
ENT_INT_DMA 
	EXPORT ENT_INT_DMA 
	 
	;/*ENT_INT_UART1*/
	ldmfd	sp!, R_ALL_0_12

	msr		cpsr_c,	#0xd3  ;/CHANGE MODLE TO THE SVC MODLE
	;/NOW IN THE SVC MODLE 
	stmfd	sp!, {RTA}    ;/save the temp value  
	
	IMPORT	LR_IRQ
	IMPORT	SPSR_IRQ
	ldr		RTA, =LR_IRQ
	ldr		RTA, [RTA]   ;/LOAD THE LR
	

	sub		RTA,RTA,#4
	stmfd	sp!, {RTA}	;/SAVE THE LR_IRQ-4 TO THE SP_SYS
	
	ldr		RTA, =SPSR_IRQ
	ldr		RTA, [RTA]   ;/LOAD THE SPSR_IRQ

	stmfd	sp!, {RTA}	;/SAVE THE SPSR_IRQ TO THE SP_SYS   ;stmfd sp!, {spsr, lr}
	;/one layer

	
	stmfd	sp!, R_ALL_0_12
	
	ldr		RTA, =INTC_PLV  ;//read the plv  and store in the stack
	ldr		RTA, [RTA]  
	stmfd	sp!, {RTA}        ;//SAVE THE PLV INTO THE SVC'S STACK

	;/set the plv
	ldr		RTA, =INTC_PLV
	mov		RTB, #0X05
	str		RTB,  [RTA]
;//	IMPORT	ent_int
;//	bl		ent_int
	;/open the irq
	;/mrs		RTA, cpsr
	;/bic		RTA, RTA, #0x80  ;OPEN IRQ
	;/bic		RTA, RTA, #0x80  ;OPEN IRQ
	;/bic		RTA, RTA, #0x80  ;OPEN IRQ
	;/msr		cpsr_c, RTA
	;/*jump to the int_handler*/
	
	
	IMPORT usbdma
	bl usbdma
	
	
	IF :DEF: HA_DEBUG
	
	ENDIF
	
	;/CLOSE THE IRQ
	mrs		RTA, cpsr
	orr		RTA, RTA, #0X80   ;/CLOSE IRQ
	msr		cpsr_c, RTA
	
	IMPORT	END_INT
	b		END_INT
	;/END OF ENT_INT_EXTINT0
	end