/******************************************************************************/
//
// Name:  BF533 EZ-KIT video ITU-656 receive mode (8bit) for the Omnivision chip OV6630
//
/******************************************************************************

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

File Name:    BF533_EZ-KIT_ISR.asm

Date Modified:   08/12/05  TL  Rev 1.0

Software:         VisualDSP++4.0, Assembler 2.6.7.5, Linker 3.5.2.2

Hardware:    BF533 EZ-KIT Board (rev 1.7), Blackfin EZ-Extender (rev 1.2)

Chip:     ADSP-BF533 REV 0.4

Special Connections:   None

Purpose:    All interrupt service routines are located here
    
    
Program Parameters:

********************************************************************************/
#include <defBF533.h>

/*****************************************************************************************/
// Global and extern subroutines
/*****************************************************************************************/

.global  PPI_DMA_ISR;
.extern  Recive_DMA_In_Progress;

/*****************************************************************************************/
// Program Define Section
/*****************************************************************************************/

/*****************************************************************************************/
// Program Variable Section
/*****************************************************************************************/

/*****************************************************************************************/
// Program
/*****************************************************************************************/
.section L1_code;

// DMA Interrupt  
PPI_DMA_ISR:

 // service the interrupt request
 p0.h = hi(DMA0_NEXT_DESC_PTR);
 p0.l = lo(DMA0_NEXT_DESC_PTR);
 r0 = 0x1(z);
 w[p0+DMA0_IRQ_STATUS-DMA0_NEXT_DESC_PTR] = r0;
 ssync;
 
 //Turn off the PPI after the Descriptor DMA has been finished
 //if not the interrupt will always be executed because of PPI activities
 p0.h = hi(PPI_CONTROL);
 p0.l = lo(PPI_CONTROL);
 r0 =  0; 
 w[p0+PPI_CONTROL-PPI_CONTROL] = r0;
 SSYNC;
 
 p0.h = Recive_DMA_In_Progress;      
 p0.l = Recive_DMA_In_Progress;      
    r0 = 1;
    [p0] = r0;  
  
 
PPI_DMA_ISR.END:
RTI;
/*******************************************************************************/

//本代码Blackfin示例