videoinedgedetection_buffers.c

这个是balckfin533/561的视频输入和输出的源代码

    Description:    Installs & configures Memory DMA

*********************************************************************/
section("App_Code_L1")
void ConfigureMDMA(
) {

    // Configure MDMA 2D structures

    /*******************************************
    video in buffer to sobel in buffer stream
    *******************************************/

	/**** Sobel In stream destination buffer config ****/
		
    // count to copy a block of size (SOBEL_COLUMN_SIZE+SOBEL_OFFSET) * (SobelRowSize+SOBEL_OFFSET) 
	MDMA_Sobel_In_Des.XCount			= (SOBEL_COLUMN_SIZE+SOBEL_OFFSET);
	// Copy luma values only
	MDMA_Sobel_In_Des.XModify			= 1;	// 1 byte increment
	// count to copy a block of size (SOBEL_COLUMN_SIZE+SOBEL_OFFSET) * (SobelRowSize+SOBEL_OFFSET)
	MDMA_Sobel_In_Des.YCount			= (SobelRowSize+SOBEL_OFFSET);
	// Move to next row
	MDMA_Sobel_In_Des.YModify			= 1;	// same as xmodify
    	
    /**** Sobel In stream source buffer config ****/    	    
	// count to copy a block of size (SOBEL_COLUMN_SIZE+SOBEL_OFFSET) * (SobelRowSize+SOBEL_OFFSET)
	MDMA_Sobel_In_Src.XCount			= (SOBEL_COLUMN_SIZE+SOBEL_OFFSET);
	// Copy luma values only
	MDMA_Sobel_In_Src.XModify			= 2;	// 2 byte increment (alternative data skipped)
	// count to copy a block of size (SOBEL_COLUMN_SIZE+SOBEL_OFFSET) * (SobelRowSize+SOBEL_OFFSET)
	MDMA_Sobel_In_Src.YCount			= (SobelRowSize+SOBEL_OFFSET);
	// Move to next row, point to first luma location minus 2
	MDMA_Sobel_In_Src.YModify			= (DataPerLine - ((SOBEL_COLUMN_SIZE+SOBEL_OFFSET) * 2) + 2);	// finally add xmodify		
	
    /*******************************************
    sobel out buffer to video out buffer stream
    *******************************************/

    /**** Sobel Out stream destination buffer config ****/
    
	// count to copy sobel out valid data only
	MDMA_Sobel_Out_Des.XCount			= SOBEL_COLUMN_SIZE;
	// Copy valid data to luma locations only
	MDMA_Sobel_Out_Des.XModify			= 2;
	// count to copy sobel out valid data only
	MDMA_Sobel_Out_Des.YCount			= SobelRowSize;
	// Move to next row, point to first luma location
	MDMA_Sobel_Out_Des.YModify			= (DataPerLine - (SOBEL_COLUMN_SIZE * 2) + 2);	// finally add xmodify
        
    /**** Sobel Out stream source buffer config *****/

	// count to copy sobel out valid data only
	MDMA_Sobel_Out_Src.XCount			= SOBEL_COLUMN_SIZE;
	// Copy luma values only
	MDMA_Sobel_Out_Src.XModify			= 1;
	// count to copy sobel out valid data only
	MDMA_Sobel_Out_Src.YCount			= SobelRowSize;
	// Move to next row
	MDMA_Sobel_Out_Src.YModify			= 3;	// skip last column data in present row and first column data in next row + xmodify
	
	/*********************************************************
    Install MDMA video in buffer to sobel in buffer stream
    *********************************************************/
    // Open MDMA
#if defined(__ADSPBF533__)
   	// DMA Manager Handle, DMA Controller- MDMA stream 0, Client Handle, Stream Handle, live callback
   	ezErrorCheck(adi_dma_MemoryOpen (DMAManagerHandle,ADI_DMA_MDMA_0,NULL,&MDMA_Handle_Stream0,NULL));
#elif defined(__ADSPBF561__)
   	// DMA Manager Handle, DMA Controller 2 - MDMA stream 0, Client Handle, Stream Handle, live callback
   	ezErrorCheck(adi_dma_MemoryOpen (DMAManagerHandle,ADI_DMA_MDMA2_0,NULL,&MDMA_Handle_Stream0,NULL));
#endif
    
	/*********************************************************
    Install MDMA sobel out buffer to video out buffer stream
    *********************************************************/
  	// Open MDMA
#if defined(__ADSPBF533__)
   	// DMA Manager Handle, DMA Controller- MDMA stream 1, Client Handle, Stream Handle, live callback
   	ezErrorCheck(adi_dma_MemoryOpen (DMAManagerHandle,ADI_DMA_MDMA_1,NULL,&MDMA_Handle_Stream1,NULL));
#elif defined(__ADSPBF561__)
   	// DMA Manager Handle, DMA Controller 2 - MDMA stream 1, Client Handle, Stream Handle, live callback
   	ezErrorCheck(adi_dma_MemoryOpen (DMAManagerHandle,ADI_DMA_MDMA2_1,NULL,&MDMA_Handle_Stream1,NULL));
#endif

	return;
}


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

    Function:       CloseMDMA_Streams

    Description:    Closes Memory DMA streams

*********************************************************************/
section ("sdram_bank1")
void CloseMDMA_Streams (void)
{    
    // Close MDMA stream 0
    ezErrorCheck(adi_dma_MemoryClose (MDMA_Handle_Stream0,FALSE));
    
    // Close MDMA stream 1
    ezErrorCheck(adi_dma_MemoryClose (MDMA_Handle_Stream1,FALSE));
    
}

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

    Function:       MDMA_Callback0

    Description:    Memory DMA callback dunction (sobel in)

*********************************************************************/
section ("Callback_Code_L1")
static void MDMA_Callback0( 
	void    *AppHandle,
	u32     Event,
	void    *pArg   
){
    // Case of (event type)
    switch (Event) {
        
        // Case descriptor processed 
        case ADI_DMA_EVENT_DESCRIPTOR_PROCESSED:
        
        	// Check if sobel out is enabled
        	if (!SobelFlag.InitSobelOut)
        	{
        	    // if not, enable Sobel Out MDMA stream
            	SobelFlag.SobelOutMDMALock	= FALSE;
            	// Sobel Out MDMA has been initialised
            	SobelFlag.InitSobelOut	 	= TRUE;	
        	}
        
        	// check sobel in bufx id that generated callback
   			if (SobelFlag.SobelInBufID)
   			{
   			    // Callback generated by Sobel_In_Buf1. Clear flag - indicates buffer already has luma values
				SobelFlag.SobelInBuf1Done	= FALSE;
   			}
			else
			{
			    // Callback generated by Sobel_In_Buf_0. Clear flag - indicates buffer already has luma values
				SobelFlag.SobelInBuf0Done	= FALSE;	
			}
			
			// Mark as Video in bufx to sobel in bufx MDMA is ready for next data stream
			SobelFlag.SobelInMDMALock	= FALSE;
       	
        	break;
        	
        // Case DMA Error
        case ADI_DEV_EVENT_DMA_ERROR_INTERRUPT:

         	// turn on all LEDs and wait for help
            ezTurnOnAllLEDs();
            while (1) ;
                      
		default:	// other events
         	// turn on all LEDs and wait for help
            ezTurnOnAllLEDs();
            while (1) ;

    }
}

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

    Function:       MDMA_Callback1

    Description:    Memory DMA callback function (sobel out)

*********************************************************************/
section ("Callback_Code_L1")
static void MDMA_Callback1( 
	void    *AppHandle,
	u32     Event,
	void    *pArg   
){
    // Case of (event type)
    switch (Event) {
        
        // Case descriptor processed 
        case ADI_DMA_EVENT_DESCRIPTOR_PROCESSED:        	
        	
        	// check Sobel_Out_Bufx id that generated callback
    		if (SobelFlag.SobelOutBufID)
    		{
    		    // callback generated by Sobel_Out_Buf1
    		    // Clear flag - indicates buffer is ready to accept edge detected output
				SobelFlag.SobelOutBuf1Done	= FALSE;	
    		}
			else
			{
			    // callback generated by Sobel_Out_Buf0
			    // Clear flag - indicates buffer is ready to accept edge detected output
				SobelFlag.SobelOutBuf0Done	= FALSE;
			}

			// Mark as Sobel_Out_Bufx to Video_Out_Buf MDMA is ready for data streaming
			SobelFlag.SobelOutMDMALock	= FALSE;
			
        	break;                        

        // Case DMA Error
        case ADI_DEV_EVENT_DMA_ERROR_INTERRUPT:

         	// turn on all LEDs and wait for help
            ezTurnOnAllLEDs();
            while (1) ;
                      
		default:	// other events
         	// turn on all LEDs and wait for help
            ezTurnOnAllLEDs();
            while (1) ;

    }
}

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

    Function:       Sobel_In_Init

    Description:    Initialises Vidio In to Sobel In streaming

*********************************************************************/
section ("Callback_Code_L1")
void SobelInInit (
	u32		*pBuffer
){
	
	/***********************************************
    Initialise Video In/Out buffer address pointers

    Video In Start address - init to point first 
    luma value minus 2 of Video_In_Bufx Active Field1
    to account for sobel algorithim invaild data, 
    pass extra 2 rows per block & 2 columns per row
    
    Video Out Start address - init to point first 
    luma value of Video_Out_Buf Active Field1
    ***********************************************/
	
	if (pBuffer == (u32 *) (&Video_In_Buffer2D[0]))		// implies Video_In_Buf0 ready for sobel conversion
	{
	    // Start address - init to point the first luma value minus 2 of Video_In_Buf0 Active Field1
		pVideoInBuf		= (u8 *)(&Video_In_Buf0[0] + (Field1Skip + ActiveVideoSkip - (DataPerLine + ITU_Y_OFFSET)));	
	}
	
#if defined(__ADSPBF561__)	
	else if (pBuffer == (u32 *) (&Video_In_Buffer2D[1]))	// implies Video_In_Buf1 ready for sobel conversion
	{
	    // Start address - init to point the first luma value minus 2 of Video_In_Buf1 Active Field1	    
		pVideoInBuf		= (u8 *)(&Video_In_Buf1[0] + (Field1Skip + ActiveVideoSkip - (DataPerLine + ITU_Y_OFFSET)));
	}
#endif

	else
		return;			// this buffer is not for us

	// Video out start address - init to point the first luma value of Video_Out_Buf Active Field1
	pVideoOutBuf	= (u8 *)(&Video_Out_Buf[0] + (Field1Skip + ActiveVideoSkip + ITU_Y_OFFSET));		
				
	tpVideoInBuf 	= NULL;			// clear the temp video in buffer pointer
	tpVideoOutBuf 	= NULL;			// clear the temp video out buffer pointer

	/***********************************************
	Init Sobel Buffer management Flags & Counters
	***********************************************/