simplememdma.c

ADI公司blackfin DSP开发板BF533 EZ-KIT LITE附带的全部原代码

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

  Copyright(c) 2005 Analog Devices, Inc. All Rights Reserved. 

  This software is proprietary and confidential.  By using this software  
  you agree to the terms of the associated Analog Devices License Agreement.  

*************************************************************************

  Please refer to the "readme" file for a description of this example.

************************************************************************

  Include files

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

#include <services/services.h>
#include "ezkitutilities.h"
 

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

  Defines
  
***********************************************************************/

#if defined(__ADSP_TETON__)

#define SourcePeripheralID ADI_DMA_MDMA2_S0
#define DestPeripheralID ADI_DMA_MDMA2_D0

#else

#define SourcePeripheralID  ADI_DMA_MDMA_S0
#define DestPeripheralID ADI_DMA_MDMA_D0
	
#endif

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

  Static data

***********************************************************************/
// storage for interrupt manager data
static u8 IntMgrData[2*(ADI_INT_SECONDARY_MEMORY)];	


// DMA Manager data (base memory + memory for 2 DMA channel)
static u8 DMAMgrData[ADI_DMA_BASE_MEMORY + (ADI_DMA_CHANNEL_MEMORY * 2)];


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

  Destination Buffer for DMA transfer

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

u32 DestBuffer[100];

 
/***********************************************************************
*
*	Function:	main
*
***********************************************************************/

void main(void) {
  
	u32 ResponseCount;
	u16 Count;
	u32 SourceValue;
	u32 *DestinationAddress;
	u32 i; //loop variable
	
	ADI_DMA_CONFIG_REG SourceConfigReg;
	ADI_DMA_CONFIG_REG DestConfigReg;
 
	ADI_DMA_MANAGER_HANDLE DMAHandle;

	ADI_DMA_CHANNEL_HANDLE ChanHandleSource;
	ADI_DMA_CHANNEL_HANDLE ChanHandleDest;



	// initialize the interrupt manager
	ezErrorCheck(adi_int_Init(IntMgrData, sizeof(IntMgrData), &ResponseCount, NULL));
	
	// initialize EZ-Kit; power and EBIU services
	ezInit(1);

	
// Initialization of DMA Manager.	
	ezErrorCheck(adi_dma_Init(DMAMgrData, sizeof(DMAMgrData), &ResponseCount, &DMAHandle, NULL));

// Register the DMA Channel for use by the DMA manager, obtaining a unique handle for each DMA 
// channel configuration, source and destination, setting ChanHandleSource equal to the address of 
// MDMA2_S0_CONFIG register and setting ChanHandleDest equal to the address of MDMA2_D0_CONFIG register.

	ezErrorCheck(adi_dma_Open(DMAHandle, SourcePeripheralID, NULL, &ChanHandleSource, ADI_DMA_MODE_SINGLE, NULL, NULL));
	ezErrorCheck(adi_dma_Open(DMAHandle, DestPeripheralID, NULL, &ChanHandleDest, ADI_DMA_MODE_SINGLE, NULL, NULL));

// Fill the memory with the 32 bit value 12345678

	SourceValue = 0x78563412;
	
	//Initialize the flag service, memory is not passed because callbacks are not being used
	ezErrorCheck(adi_flag_Init(NULL, 0, &ResponseCount, NULL));
	
	//Initialize all LEDS
	for (i = EZ_FIRST_LED; i < EZ_NUM_LEDS; i++){
        ezInitLED(i);
	}

/********************************************************************************
 NOTE:  To clear the memory, uncomment this line, setting the source value to zero
********************************************************************************/
//	SourceValue = 0x0;


// Set number of iterations
	Count = 100;

// This should be assigned by "ifdef" to be a processor specific address in SRAM
	DestinationAddress = DestBuffer;
	
// Set the config registers for 1 dimensional 32 bit transfers into common SRAM 
 
 	SourceConfigReg.b_WNR = 0;	// 1	Direction
	SourceConfigReg.b_WDSIZE = 2;	// 2:3	Transfer word size	
	SourceConfigReg.b_DMA2D = 0;	// 4	DMA mode 
	SourceConfigReg.b_NDSIZE = 0;	// 8:11	Flex descriptor size
 
	DestConfigReg.b_WNR = 1;	// 1	Direction
	DestConfigReg.b_WDSIZE = 2;	// 2:3	Transfer word size	
	DestConfigReg.b_DMA2D = 0;	// 4	DMA mode 
	DestConfigReg.b_NDSIZE = 0;	// 8:11	Flex descriptor size

// Assigning a data buffer to the source Channel, and copy from the address that the source value compiled to. 	
	ezErrorCheck(adi_dma_Buffer(ChanHandleSource, &SourceValue, SourceConfigReg, Count, 0,  0, 0 ));

// Assigning a data buffer to the destination Channel, and copy to "DestinationAddress". 	
	ezErrorCheck(adi_dma_Buffer (ChanHandleDest, DestinationAddress, DestConfigReg, Count, 4,  0, 0 ));

// Initiate the transfer
	ezErrorCheck(adi_dma_Control(ChanHandleSource, ADI_DMA_CMD_SET_DATAFLOW, (void *)TRUE));
	ezErrorCheck(adi_dma_Control(ChanHandleDest, ADI_DMA_CMD_SET_DATAFLOW, (void *)TRUE));
	
	while (1) 
	{
	    
        i=i;
// Stop here and see the value 12345678 repeated 100 times, at DestinationAddress 
	
	}	
}