dma_config.c

来自「BF-533 DSP视频输入接口的代码」· C语言 代码 · 共 55 行

/******************************************************************************/
//
// Name: 	BF533 EZ-KIT DMA Setup
//
/******************************************************************************

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

File Name:	SDRAM_Config.c

Date Modified:	7/02/03		TL		Rev 0.1

Software:       VisualDSP++3.1

Hardware:		ADSP-BF533 EZ-KIT Board

Special Connections:  None

Purpose:		The file sets up the DMA transfer
				
				

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


#include <cdefBF533.h>
#define RAM_Length 50000




void Init_DMA(void)
{

	//Target address of the DMA
	*pDMA0_START_ADDR = 0x0;	

	//RAM_Length 32bit transfers will be executed
	*pDMA0_X_COUNT = RAM_Length;

	//The modifier is set to 4 because of the 32bit transfers
	*pDMA0_X_MODIFY = 0x4;	
														

	//PPI Peripheral is used
	*pDMA0_PERIPHERAL_MAP = 0x0;	
	
	//DMA Config: Enable DMA | Memory write DMA | Discard DMA FIFO before start | enable assertation of interrupt | NDSIZE for stop mode | Enable STOP DMA
	*pDMA0_CONFIG = DMAEN | DI_EN | WNR | WDSIZE_32 | RESTART | DI_EN;	
	

}//end Init_DMA