mt8880.c

来自「无线红外传感报警系统」· C语言 代码 · 共 117 行

#include "Head.h"
unsigned char Read_80(void)
{   unsigned char data temp;
	CS_80=0;	//片选输入，低电平有效
	temp=P1;
	CP_80=1;
	_nop_();
	_nop_();
	CP_80=0;
	_nop_();
	CS_80=1;
	CP_80=1;	//*构造8880时钟时序
    RS_80=1;
return temp;
}
void Write_80(unsigned char Data)
{	unsigned char data temp;
	CS_80=0;
	temp=P1;
	temp &=0xf0;
	P1=Data+temp;
	WR_80=0;  //write
	_nop_();
	CP_80=1;
	_nop_();
	CP_80=0;
	WR_80=1;
	CS_80=1;
	CP_80=1;
    RS_80=1;
}
unsigned char Read_80status(void)
{	
	RS_80=1;
	return Read_80();
	
}
void  Write_80Cont(unsigned char command)
{
	RS_80=1;
	Write_80(command);
}
unsigned char Read_80Data(void)
{	
	RS_80=0;
	return Read_80();
}
void  Write_80Data(unsigned char command)
{
	RS_80=0;
	Write_80(command);
}
bit SendDTMF(uchar * buff)
{static uchar SendState,i;
switch (SendState)
   {
   case 0: Write_80Data(buff[i++]);  //2
           TimeCNT=1;
		   SendState=1;
		   break;
   case 1: if(TimeCNT<40) break;
   	       SendState=0; TimeCNT=0;
		   if(buff[i]==0xff) {i=0;P1=0xff;return 1;}
		   break;
   }
return 0;
}
/*
void initial_8880(void)
{  unsigned char temp;
	Read_80status();
	Write_80Cont(0);   //CRA
	Write_80Cont(0);
	Write_80Cont(0x01);
	Write_80Cont(0);  //CRB
	Read_80status();
	Write_80Cont(0x0b);
	Write_80Cont(0);   //CRB
	Read_80status();
	HANDUP=0;
	LINE =0;
	delay();
	Write_80Data(0x04);  //2
	delay();
	Write_80Data(0x05);  //0
	delay();
	Write_80Data(0x05);  //0
	delay();
	Read_80status();
	EX1=1;
	IT1=1;
	EA=1;
	P1=0xff;
	while(1) _nop_();;
		{
	_nop_();
	if((Read_80status()&0x02)==0x02)  	   
		    {temp=Read_80Data();
		    P2=temp<<4;
			}
		}
	
} 
void getDTMF(void) interrupt 2 using 2 
{   unsigned char temp;
	
    temp=Read_80status();
	P1=0xff;
	if((temp&0x02)==0x02) 
	{
	temp=Read_80Data();
	P0=temp<<4;
	}
	P1=0xff;
}
*/