bf533_ez-kit_isr.asm

bf533平台图像采集程序

/******************************************************************************/
//
// Name: 	BF533 EZ-KIT video ITU-656 receive mode 
//
/******************************************************************************

(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved.

File Name:		BF533_EZ-KIT_ISR.asm

Date Modified:	10/25/04		TL		Rev 2

Software:       VisualDSP++3.1

Hardware:		ADSP-BF533 EZ-KIT Board

Special Connections:  None

Purpose:		All interrupt service routines are located here 
				
				
Program Parameters:

********************************************************************************/


#include <defBF533.h>

.global		PPI_DMA_ISR_ASM;

.extern _YUV_656;

.extern _frame_flag;

.section L1_code;
/*******************************************************************************/


//Stop DMA Interrupt		
PPI_DMA_ISR_ASM:
	
	[--SP] = ASTAT;			//Save Regs onto stack
	[--SP] = RETS;
	[--SP] = r0;
	[--SP] = p0;	

	//disable the interrupt request
	p0.h = hi(DMA0_NEXT_DESC_PTR);
	p0.l = lo(DMA0_NEXT_DESC_PTR);
	r0 = 0x1(z);
	w[p0+DMA0_IRQ_STATUS-DMA0_NEXT_DESC_PTR] = r0;
	
	p0.l = _frame_flag;
	p0.h = _frame_flag;

	[p0] = r0;
	
	p0 = [SP++];  		//Restore Regs from Stack
	r0 = [SP++];
	RETS = [SP++];
	ASTAT = [SP++];
	
PPI_DMA_ISR_ASM.END:
RTI;
/*******************************************************************************/