callid.c

一种电话遥控板的原程序

#define COMMaxByte			32
 
uchar idata  CallIDSum;
uchar idata  CallIDFormat;
uchar idata  CallidFlag ;
//uchar idata  CallIDAccept;
uchar idata  CallIDStat;
uchar idata  COMBufferLen;
uchar idata  COMBuffer[COMMaxByte];
uchar idata ring_time ;
/*****************************************************
拨特率：1200    248个周期（晶振3.5795M）  delay 830 us
		1200    766个周期（晶振11.0592M）
				when call :150 or 189
*****************************************************/
void Fsk_delay(uchar in)	//call 1 time + 5 
{
	uchar i ;
	for(i=in;--i;) ;		//delay 2*in
}

void callid_open()
{
	COMBufferLen = 0 ;
	CallIDStat = FALSE ;
	CallidFlag = TRUE ;
	CallIDFormat = 0xFF;
	CallIDSum = 0xFF;
	ring_time = 0 ;
	PDWN = 0 ;
}

void callid_close()
{
	COMBufferLen = 0 ;
	CallIDStat = FALSE ;
	CallidFlag = FALSE ;
	CallIDFormat = 0xFF;
	CallIDSum = 0xFF;
//	Callid_Ring_time = 0 ;
	ring_time = 0 ;
	PDWN = 1 ;
}

uchar CallIDStatBit()		//check start bit delay 370
{
	uchar sample ;
	uint i ;

	i = 0 ;
	sample = 0 ; 
	while((FSKDIN == 1)||(sample == 0))						//下降沿检测
	{
		if((FSKDIN == 1)&&(sample ==0))
			sample = 1 ;
		if((DV_FSK == 1)||(RING == 0))
		{
			return 2 ;
		}
		if(i++ > 60000)	return 2 ;
	}
	Fsk_delay(180) ;	//
	Fsk_delay(189) ;
	Fsk_delay(189) ;
	return TRUE ;
}
uchar CallIDReadByte()
{
	uchar i,j ;
	uchar temp;

	temp = 0;
	for(i=8;i>0;i--)             //830us
	{
		temp >>= 1;
		if(FSKDIN == 1)
			temp |= 0x80;
		else
			j++ ;
		Fsk_delay(189) ;
		Fsk_delay(189) ;
	}
	return(temp);
}

uchar CallIDProc()
{
	uchar temp ;
	uchar temp_r ;
	
//	if(CallidFlag == FALSE)	return ERROR ;
StatBitLoop:
//	if(CallIDStatBit() != TRUE)	goto StatBitLoop ;
	temp_r = CallIDStatBit() ;
	if(temp_r == TRUE)
		temp = CallIDReadByte();
	else if(temp_r == 2)
	{
		return 2 ;
	}
	else	goto StatBitLoop ;
//	temp = CallIDReadByte();
	if(CallIDStat != TRUE)
	{
		if((temp == 0x80)||(temp == 0x04))
		{
			CallIDStat = TRUE ;
			CallIDFormat = temp;
			CallIDSum = temp;
		}
		goto StatBitLoop;
	}
	if(COMBufferLen == COMMaxByte)
	{
		return ERROR ;
	}
	if(COMBufferLen == 0)
	{
		CallIDSum += temp;
		COMBuffer[0] = temp;
		COMBufferLen++;
	}
	else if((COMBufferLen-1) == COMBuffer[0])
	{
		CallIDSum += temp;
		if((CallIDSum != 0)||(COMBuffer[0]<8))
		{
			return ERROR ;
		}
		else 
		{
			return OK ;
		}
	}
	else
	{
		temp &= 0x7F;
		CallIDSum += temp;
		COMBuffer[COMBufferLen++] = temp-0x30;
	}
	goto StatBitLoop;
}