www.pudn.com > Lab534-VideoMotionDetect.rar > thrControl.c

/* 
 *  Copyright 2002 by Texas Instruments Incorporated. 
 *  All rights reserved. Property of Texas Instruments Incorporated. 
 *  Restricted rights to use, duplicate or disclose this code are 
 *  granted through contract. 
 *   
 */ 
/* 
 *  ======== thrControl.c ======== 
 *  This file shows an example of sending messages from one thread to the 
 *  other using mailbox. 
 */ 
#include  
 
// DSP/BIOS includes 
#include  
#include  
 
// RF includes 
#include  
 
// application includes 
#include "appResources.h"   // application-wide common info 
#include "appThreads.h"     // thread-wide common info 
#include "thrControl.h" 
 
#include "process/thrProcess.h"     /* contains thread specific information */ 
 
// global variables to be modified by GEL 
#define NUMCONTROLS 4 
 
//Structure for external control variables 
typedef struct ExternalControl { 
    Int setReference;	//0 or 1, to set reference frame 
    Int yValue;			//New color values.  All three, 
    Int crValue;		//Y, Cr, and Cb are passed together 
    Int cbValue;		//in one message 
} ExternalControl; 
 
ExternalControl externalControl;        // GEL script writes here 
ExternalControl externalControlPrev;    // this is a local copy  
 
/* 
 *  ======== thrControlInit ======== 
 * 
 */ 
Void thrControlInit() 
{ 
    UTL_assert( NUMCONTROLS == 4 ); 
 
    // set the default Reference Frame and Colors 
    externalControl.setReference = 1; 	//Set first frame as reference 
    externalControl.yValue = 0;			//Initial color is red 
    externalControl.crValue = 39;		//(y,cr,cb) = (0,39,255) 
    externalControl.cbValue = 255; 
     
    externalControlPrev = externalControl; 
} 
 
/* 
 *  ======== thrControlStartup ======== 
 * 
 */ 
Void thrControlStartup() 
{     
    CtrlMsg txMsg1; 
    CtrlMsg txMsg2; 
     
    //Set initial reference frame to be 1st frame. 
    //Only need to send message that we want a new 
    //reference frame. 
    txMsg2.cmd = MSGNEWREFERENCE; 
    txMsg2.arg1 = 0; 
    txMsg2.arg2 = 0; 
     
    MBX_post(&mbxProcess, &txMsg2, 0); 
     
    //Post Message for Color Value.  We encode the (Cr,Cb)  
    //pair into one value, so that we do not have to 
    //post 3 messages. 
    txMsg1.cmd = MSGNEWCOLOR; 
    txMsg1.arg1 = externalControl.yValue; 
    txMsg1.arg2 = (externalControl.crValue << 8) + externalControl.cbValue; 
     
    MBX_post(&mbxProcess, &txMsg1, 0); 
} 
 
/* 
 *  ======== thrControlRun ======== 
 * 
 *  Main function of Control task. 
 */ 
Void thrControlRun() 
{ 
    CtrlMsg txMsg1; 
    CtrlMsg txMsg2; 
     
	// Main loop 
	while (TRUE) { 
	     
	    //See if user requested new reference frame 
	    if (externalControl.setReference) 
	    { 
	    	txMsg1.cmd = MSGNEWREFERENCE; 
	    	txMsg1.arg1 = 0; 
	    	txMsg1.arg2 = 0; 
	    	MBX_post(&mbxProcess, &txMsg1, 0); 
	    	 
	    	//Reset setReference to FALSE 
	    	externalControl.setReference = 0; 
	    } 
	     
	    //See if user requested new color 
	    //We encode (Cr,Cb) pair into one value so that 
	    //we do not have to post 3 messages 
	    if ((externalControl.yValue != externalControlPrev.yValue) || 
	    	(externalControl.crValue != externalControlPrev.crValue) || 
	    	(externalControl.cbValue != externalControlPrev.cbValue)) 
	    { 
	    	txMsg2.cmd = MSGNEWCOLOR; 
	    	txMsg2.arg1 = externalControl.yValue; 
	    	txMsg2.arg2 = (externalControl.crValue << 8) + externalControl.cbValue; 
	    	MBX_post(&mbxProcess, &txMsg2, 0); 
	    } 
	     
	    externalControlPrev = externalControl; 
	     
	    // suspend self for 100 ticks, and then poll again 
	    TSK_sleep( 100 ); 
	} 
}