ht9200.c

一种51单片机接收电话线上DTMF

/********************************************
	ht9200/ht9170程序
	双音多频接收发射程序
********************************************/

sbit DATA  = P3^7 ;
sbit CLK  = P3^6 ;
sbit CE  = P2^7 ;

/*******************************************
	DTMF 数据口：P0^0 ~ P0^3
*******************************************/
sbit DV  = P2^6 ;
sbit OE  = P3^2 ;
//sbit PWDN  = P3^6 ;
//sbit INH  = P3^7 ;
sbit SB  = P3^3 ;
sbit DXC  = P3^5 ;
#define RING  	T1

uchar idata Check0 ;
uchar idata Counter0 ;
uchar idata Check1 ;
uchar idata Counter1 ;
uchar idata Check3 ;
uchar idata Counter3 ;
uchar idata Check4 ;
uchar idata Counter4 ;

uchar code Table_DTMF[] = {0x0a,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0d,0x0e,0x0f,0x00,0x0b,0x0c} ;
//			    0    1    2    3     4    5   6    7    8    9    A    B     C    D    *    # 

void senddata_ht9200(uchar in)
{
	uchar i;
	for(i=0;i<5;i++)
	{
		if(((in>>i)&0x01) == 1)
			DATA = 1 ;
		else    DATA = 0 ;
		CLK = 0 ;
		CLK = 1 ;
	}
}
/******************************************
	发送子程序
	in 为要发送的数 0-15
******************************************/
void send_ht9200(uchar in)
{
	CE   = 0 ;
	CLK  = 1 ;
	time(50) ;
	EA = 0 ;
	senddata_ht9200(Table_DTMF[in]) ;
	EA = 1 ;
	delay(100) ;
	CE   = 1 ;
}

/*****************************************
	DTMF 读程序
	返回 DTMF值
*****************************************/
uchar DTMF_read(void)
{
	uchar temp ;
	uchar i ;
	
	EA = 0 ;
	P0 = 0xff ;
	OE = 1 ;
	ACC = ACC ;
	temp = P0&0x0f ;
	OE = 0 ;
	EA = 1 ;
	for(i=0;i<16;i++)
	{
		if(temp == Table_DTMF[i])
			return i ;
	}
	return(0xff) ;
}

/******************************************
	初始化检测程序
******************************************/
void checkRING_Init()
{
	Check0 = 2 ;
	Counter0 = 20 ;
}

void checkDV_Init()
{
	Check1 = 2;
	Counter1 = 20;
}
void checkSB_Init()
{
	Check3 = 2 ;
	Counter3 = 20 ;
}

void checkDXC_Init()
{
	Check4 = 2;
	Counter4 = 20;
}
/***************************************
	 检测程序0
	 检测振铃RING
	 返回         TRUE ：有
	 	      FALSE：无
***************************************/
uchar check_RING(void)		//
{
	uchar flag ;
	
	flag = RING ;			//check RING
	if((flag == 0)&&(Counter0 < 30))
		Counter0 ++ ;
	if((flag == 1)&&(Counter0 > 0))
		Counter0 -- ;
	if(Counter0 == 30)
	{
		Counter0 = 20 ;
		if(flag != Check0)
		{
			Check0 = flag ;
			return TRUE ;
		}
		else return FALSE; 
	}
	else if(Counter0 == 0)
	{
		Counter0 = 20 ;
		Check0 = 1;
		return FALSE;
	}
	else
		return FALSE ;
}

/***************************************
	 检测程序1
	 检测有无DTMF信号 DV
	 返回         TRUE ：有
	 	      FALSE：无
***************************************/
uchar check_DV(void)		//
{
	uchar flag ;
	
	flag = DV ;			//check DV
	if((flag == 1)&&(Counter1<30))
		Counter1 ++ ;
	if((flag == 0)&&(Counter1 >0))
		Counter1 -- ;
	if(Counter1 == 30)
	{
		Counter1 = 20 ;
		if(flag != Check1)
		{
			Check1 = flag ;
			return TRUE ;
		}
		else	return FALSE ;
	}
	else if(Counter1 == 0)
	{
		Counter1 = 20 ;
		Check1  = 0 ; 
		return FALSE ;
	}
	else return FALSE ;
}

/***************************************
	 检测程序3
	 检测振铃SB
	 返回         TRUE ：有
	 	      FALSE：无
***************************************/
uchar check_SB(void)		//
{
	uchar flag ;
	
	flag = SB ;			//check SB
	if((flag == 0)&&(Counter3 < 30))
		Counter3 ++ ;
	if((flag == 1)&&(Counter3 > 0))
		Counter3 -- ;
	if(Counter3 == 30)
	{
		Counter3 = 20 ;
		if(flag != Check3)
		{
			Check3 = flag ;
			return TRUE ;
		}
		else return FALSE; 
	}
	else if(Counter3 == 0)
	{
		Counter3 = 20 ;
		Check3 = 1;
		return FALSE;
	}
	else
		return FALSE ;
}

/***************************************
	 检测程序4
	 检测有无DTMF信号 DV
	 返回         TRUE ：有
	 	      FALSE：无
***************************************/
uchar check_DXC(void)		//
{
	uchar flag ;
	
	flag = DXC ;			//check DXC
	if((flag == 1)&&(Counter4<30))
		Counter4 ++ ;
	if((flag == 0)&&(Counter4 >0))
		Counter4 -- ;
	if(Counter4 == 30)
	{
		Counter4 = 20 ;
		if(flag != Check4)
		{
			Check4 = flag ;
			return TRUE ;
		}
		else	return FALSE ;
	}
	else if(Counter4 == 0)
	{
		Counter4 = 20 ;
		Check4  = 0 ; 
		return FALSE ;
	}
	else return FALSE ;
}