isr.c

以TI 公司的OMAP5910为例

//////////////////////////////////////////////////////////////////////////
//            Copyright (C) 2004, Eyoka @ Microunit
//                           All Rights Reserved
//________________________________________________________________________
//
// FILENAME:    isr.c
// PROJECT:     High-Resolution Video System On OMAP
// MODULE:      DSP System
// DESCRIPTION: Interrupt Service Routines.
// TARGET CPU:  DSP-C55xx of OMAP5910
// VERSION:     0.1
//________________________________________________________________________
//
// REVISE HISTORY
// DATE         VERSION AUTHOR  DESCRIPTION
// 2004-11-09   0.1     Eyoka   Created.
//////////////////////////////////////////////////////////////////////////

#include "dspsys.h"
#include "armdsp.h"


/////////////////////////////////////////////////////////////////////
// GLOBAL VARIABLES
/////////////////////////////////////////////////////////////////////

extern volatile BOOL g_bBusy;
extern volatile BOOL g_bStop;
extern volatile WORD g_Task;

/////////////////////////////////////////////////////////////////////
// Interrupt Service Routines
/////////////////////////////////////////////////////////////////////

//___________________________________________________________________
//
// Mailbox1 ISR
//___________________________________________________________________
//
interrupt void ISR_Mailbox1()
{
	WORD data, cmd;
	MBX_Read1(&data, &cmd);

	if(g_bBusy)
	{
		// DSP is busy.
		puts("dsp busy");
		MBX_Write1(0, MBX1CMD_BUSY);
		return;
	}

	switch(cmd)
	{
	case MBX1CMD_ECHO:
		MBX_Write1(data, MBX1CMD_ECHO);
		return;

	case MBX1CMD_CONVERT:
		g_Task = TASK_CONVERT;
		return;

	case MBX1CMD_FILTER:
		g_Task = TASK_FILTER;
		return;

	case MBX1CMD_JPG_ENCODE:
		g_Task = TASK_JPG_ENCODE;
		return;

	case MBX1CMD_JPG_STOP:
		g_bStop = TRUE;
		//@@@@@@@@@@@@@@@@@@
		// TO DO: check g_bStop flag during encoding
		//@@@@@@@@@@@@@@@@@@
		return;

	case MBX1CMD_JPG_RESET:
		g_Task = TASK_JPG_RESET;
		return;

	case MBX1CMD_JPG_UPDATE_SIZE:
		g_Task = TASK_JPG_UPDATE_SIZE;
		return;

	case MBX1CMD_JPG_UPDATE_QUALITY:
		g_Task = TASK_JPG_UPDATE_QUALITY;
		return;

	case MBX1CMD_JPG_UPDATE_SRCMODE:
		g_Task = TASK_JPG_UPDATE_SRCMODE;
		return;

	default:
		MBX_Write1(0, MBX1CMD_ERROR);
	}

}



// the end
//////////////////////////////////////////////////////////////////////////