bf533_ez-kit_dma_config.asm

BF-533 DSP视频输入接口的代码

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

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

File Name:		BF533_EZ-KIT_DMA_Config.asm

Date Modified:	3/27/03		TL		Rev 1.2

Software:       VisualDSP++3.1

Hardware:		ADSP-BF533 EZ-KIT Board

Special Connections:  None

Purpose:		DMA controller  setup
				
				
Program Parameters:

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


#include <defBF533.h>

.global		BF533_EZ_KIT_DMA_Config;

#define RAM_Length 50000



.section L1_code;
/*******************************************************************************/
BF533_EZ_KIT_DMA_Config:

	p0.h = hi(DMA0_NEXT_DESC_PTR);
	p0.l = lo(DMA0_NEXT_DESC_PTR);
	
	//Target address of the DMA
	r0.h = 0x0;	
	r0.l = 0x0;
	[p0+DMA0_START_ADDR-DMA0_NEXT_DESC_PTR] = r0;
	
	//RAM_Length 32bit trasnfers will be executed
	r0 = RAM_Length(z);
	w[p0+DMA0_X_COUNT-DMA0_NEXT_DESC_PTR] = r0;
	
	//The modifier is set to 4 because of the 32bit transfers
	r0 = 4(z);
	w[p0+DMA0_X_MODIFY-DMA0_NEXT_DESC_PTR] = r0;

	//PPI Peripheral is used
	r0 = 0x0000(z);
	w[p0+DMA0_PERIPHERAL_MAP-DMA0_NEXT_DESC_PTR] = r0;
	SSYNC;
	
	//DMA Config: Enable DMA | Memory write DMA | Discard DMA FIFO before start | enable assertation of interrupt | NDSIZE for stop mode | Enable STOP DMA
	r0 = DMAEN | DI_EN | WNR | WDSIZE_32 | RESTART | DI_EN (z);	
	w[p0+DMA0_CONFIG-DMA0_NEXT_DESC_PTR] = r0;
	SSYNC;

BF533_EZ_KIT_DMA_Config.END:		
RTS;
/*******************************************************************************/