buffer_init_example.c

ADI的ADSP-BF561下实现多媒体开发的通用框架。

#include "buffer_init.h"

/************************************************************************
*Descritionn:Initialises the video in/out peripheral DMA buffers and also 
*			 the MEMDMA buffers
*			 TRANSFER_LENGTH is 4 (32-bit). On BF561 the maximum data width transfer
*			 is 32 bit.  
************************************************************************/


/************************************************************************
	Function:buffer_init
	
	Description:Maintain three buffers in L2 memory. The number can be 
				increased but correspondingly case statements should be
				added. The buffers are managed as seperate variables to 
				allow explicit placements in the memory
************************************************************************/

//buffer_Init
void buffer_init()
{
	int i;
	for (i = 0; i < NUM_BUFFERS_L2; i++) {
		switch (i)
		{		
			case 0:
				Buffer2D_IN[i].Data = subFrame1;
				break;
			case 1: 
				Buffer2D_IN[i].Data = subFrame3;
				break;
			case 2: 
				Buffer2D_IN[i].Data = subFrame5;
				break;
		}
		Buffer2D_IN[i].ElementWidth = TRANSFER_LENGTH;
		Buffer2D_IN[i].XCount = 1716/TRANSFER_LENGTH;
		Buffer2D_IN[i].XModify = TRANSFER_LENGTH;
		Buffer2D_IN[i].YCount = L2NUMROWS;
		Buffer2D_IN[i].YModify = TRANSFER_LENGTH;
		Buffer2D_IN[i].CallbackParameter =&Buffer2D_IN[0];//NULL;
		Buffer2D_IN[i].pNext = &Buffer2D_IN[i+1];
	}
	Buffer2D_IN[NUM_BUFFERS_L2-1].pNext = NULL;
	
		for (i = 0; i < NUM_BUFFERS_L2; i++) {
		switch (i)
		{		
			case 0:
				Buffer2D_OUT[i].Data = subFrame2;
				break;
			case 1: 
				Buffer2D_OUT[i].Data = subFrame4;
				break;
			case 2: 
				Buffer2D_OUT[i].Data = subFrame6;
				break;
		}
		Buffer2D_OUT[i].ElementWidth = TRANSFER_LENGTH;
		Buffer2D_OUT[i].XCount = 1716/TRANSFER_LENGTH;
		Buffer2D_OUT[i].XModify = TRANSFER_LENGTH;
		Buffer2D_OUT[i].YCount = NUMROWS;
		Buffer2D_OUT[i].YModify = TRANSFER_LENGTH;
		Buffer2D_OUT[i].CallbackParameter =NULL;//&Buffer2D_IN[0];
		Buffer2D_OUT[i].pNext = NULL;//&Buffer2D_OUT[i+1];
	}
	Buffer2D_OUT[NUM_BUFFERS_L2-1].pNext = NULL;
	
}

/************************************************************************
	Function:L2Buffer_FullSliceInit
	
	Description:
************************************************************************/

void L2Buffer_FullSliceInit(ADI_DMA_2D_TRANSFER * buffer, unsigned char * startaddress)
{
		buffer->StartAddress = startaddress;
		buffer->XCount = 1716/TRANSFER_LENGTH;
		buffer->XModify = TRANSFER_LENGTH;
		buffer->YCount =  MBROWS;
		buffer->YModify = TRANSFER_LENGTH;
}

/************************************************************************
	Function:L2BufferInit
	
	Description:
	
	Modifications from template: Since sobel on only Y component, 
	every alternate 8-bit data transferred to L1.
	XMODIFY = 2.  
************************************************************************/

void L2BufferInit(ADI_DMA_2D_TRANSFER * buffer, unsigned char * startaddress)
{
		buffer->StartAddress = startaddress;
		buffer->XCount = MBCOLS/TRANSFER_LENGTH_2;
		buffer->XModify = TRANSFER_LENGTH_2;
		buffer->YCount =  MBROWS;
		buffer->YModify = 1716-MBCOLS+TRANSFER_LENGTH_2;
}

/************************************************************************
	Function:L1BufferInit
	
	Description:
	
	Modifications from the template: 
	XMODIFY =1 as Y components are placed in contiguously
	in L1 buffers
************************************************************************/

void L1BufferInit(ADI_DMA_2D_TRANSFER * buffer, unsigned char * startaddress)
{
		buffer->StartAddress = startaddress;
		buffer->XCount = MBCOLS/TRANSFER_LENGTH_2;
		buffer->XModify = TRANSFER_LENGTH_1;
		buffer->YCount =  MBROWS;
		buffer->YModify = TRANSFER_LENGTH_1;
}

/************************************************************************
	Function:L2Buffer_FullMBInit
	
	Description:
************************************************************************/

void L2Buffer_FullMBInit(ADI_DMA_2D_TRANSFER * buffer, unsigned char * startaddress)
{
		buffer->StartAddress = startaddress;
		buffer->XCount = MBCOLS/TRANSFER_LENGTH;
		buffer->XModify = TRANSFER_LENGTH;
		buffer->YCount =  MBROWS;
		buffer->YModify = 1716-MBCOLS+TRANSFER_LENGTH;
}

/************************************************************************
	Function:L1Buffer_FullMBInit
	
	Description:
************************************************************************/

void L1Buffer_FullMBInit(ADI_DMA_2D_TRANSFER * buffer, unsigned char * startaddress)
{
		buffer->StartAddress = startaddress;
		buffer->XCount = MBCOLS/TRANSFER_LENGTH;
		buffer->XModify = TRANSFER_LENGTH;
		buffer->YCount =  MBROWS;
		buffer->YModify = TRANSFER_LENGTH;
}