at89c52.c

一个DVD组合机的MCU代码,FM,机芯出入仓,功放的控制及DVD数据通过通信来访问.

/*-TAB=2-------------------------------------------------------------------*/
/**------------------------------------------------------------------------*
 *                                                                         *
 * NAME:Display.c                                                          *
 *                                                                         *
 *                                                                         *
 * UPDATE: 2002/8/15  YCD                                                  *
 *                                                                         *
 *                                                                         *
 *                                                                         *
 *-------------------------------------------------------------------------*/
#include "..\SRC\ZM.H"

#define TL0_VALUE  0x18
#define TH0_VALUE  0xFC

void DelayMs(BYTE aCount);


BYTE	gMsCount=0;
WORD 	gTimeCount=0;
BYTE 	gSecondTm=0;
BYTE  gStandbyTmCount=0;
extern BYTE  gMpgTmCount;
extern BYTE  gLedTmCount;
extern WORD  gRadioKeyToAutoTmCount;
extern WORD  gCloseMuteWaitTm;

/**
 *@void InitAt89c52(void)
 *@update 2002/8/20
 */
void InitAt89c52(void)
{
	IE=0;

	/*TF1 TR1 TF0 TR0|IE1 IT1 IE0 IT0*/
	/* 0   0   0   0   0   1   0   1 */
	TCON=0X05;

	/*GATE C/T M1 M0|GATE C/T M1 M0 */
	/* 0    0  0  1   0    0  0   1 */
	TMOD=0X11;

	TL0=TL0_VALUE;
	TH0=TH0_VALUE;
	TL1=0;
	TH1=0;

	ET0=1;
	EX1=1;

	TR0=1;
	TR1=1;

	EA=1;
}


/**
 *@interrupt [0x0B] void T0_int (void)
 *@1ms
 *@update 2002/8/20
 */
interrupt [0x0B] void T0_int (void)
{
	gMsCount++;
	if(gMpgTmCount)   gMpgTmCount--;
	if(gLedTmCount)   gLedTmCount--;
	if(gStandbyTmCount) gStandbyTmCount--;
	if(gRadioKeyToAutoTmCount) gRadioKeyToAutoTmCount--;
	if(gCloseMuteWaitTm) gCloseMuteWaitTm--;

	if(gTimeCount==0){
		gSecondTm++;
		gTimeCount=1001;
	}
	gTimeCount--;

	TL0=TL0_VALUE;
	TH0=TH0_VALUE;
}


#ifdef  EX0_INTERRUPTE
/**
 *@interrupt [0x03] void EX0_int (void)
 *@update 2002/8/20
 */
interrupt [0x03] void EX0_int (void)	  /* External Interrupt 0 */
{
}

#endif


/*-----------------------------------------------------------------------*/
bit  gStandbyKey=P2.0;
bit  gboolStandbyContinueKey;
/**
 *@BYTE IsPressStandBy(void)
 *@reutn 1:have 0:no
 *@update 2002/9/19
 */
BYTE IsPressStandBy(void)
{
	BYTE Result=0;

	if(gStandbyKey==BIT_HI) gboolStandbyContinueKey=0;

	if(gboolStandbyContinueKey==0){
		if(gStandbyTmCount==0){
			if(gStandbyKey==BIT_LOW){
				gboolStandbyContinueKey=1;
				gStandbyTmCount=100;
				Result=1;
			}
		}
	}

	return(Result);
}


/*-------------------------------------------------------------------------*/
CTimeOut  gGroupTime[INDEX_TOTAL];
/**
 *@void InitTime(BYTE aIndex,BYTE aCount)
 *@PARAM aIndex>=0X80 is second  or aIndex<0X80 is Ms
 *@UPDATE 2002/8/13
 */
void InitTime(BYTE aIndexType,BYTE aCount)
{
	BYTE i=aIndexType&0x7f;
	gGroupTime[i].mPrevTime=(aIndexType>0x7f)?gSecondTm:gMsCount;
	gGroupTime[i].mCount=aCount;
}

/**
 *@BYTE IsTimeOUt(BYTE aIndex)
 *@PARAM aIndex>=0X80 is second  or aIndex<0X80 is Ms
 *@UPDATE 2002/8/13
 */
BYTE IsTimeOut(BYTE aIndexType)
{
	BYTE CurTime,Result=0;
	BYTE i=aIndexType&0x7f;

	if(gGroupTime[i].mCount==0) Result=1;
	else{
		CurTime=(aIndexType>0x7f)?gSecondTm:gMsCount;
		if(CurTime!=gGroupTime[i].mPrevTime){
			gGroupTime[i].mCount--;
			gGroupTime[i].mPrevTime=CurTime;
		}
	}
	return(Result);
}

/**
 *@void DelayMs(BYTE aCount)
 *@update 2002/9/8
 */
void DelayMs(BYTE aCount)
{
	InitTime(INDEX_DELAY_MS,aCount);
	while( !IsTimeOut(INDEX_DELAY_MS) );
}