baseclk.c

15693 hf reader 伟根26接口

#include "typedef.h"
#include "intrins.h"
#include "time.h"
#include "ll.h"

////////////////////////////////////////////////////
void _sendBit(bit temp)
{
	DIN = 1;
	SCLOCK = 0; _nop_();    
	DIN = temp; _nop_();  
	SCLOCK = 1; _nop_(); 
	SCLOCK = 0;
}
/************************************************************************/
/* clockmaster transfer from uctrl to ASIC*/
/************************************************************************/
void _trans1(void)
{
	SCLOCK = 0;  
	DIN = 0;  _nop_();
	DIN = 1;  _nop_();
	DIN = 0;  _nop_();
	DIN = 1;  _nop_();
	SCLOCK = 1;_nop_();
}
/*****************************************************************/
/* clockmaster transfer from ASIC to uctrl************************/
/*****************************************************************/

void _trans2(void)
{
	SCLOCK = 0;  
	DIN = 1;   _nop_();
	DIN = 0;  _nop_();
	DIN = 1;  _nop_();
	DIN = 0;  _nop_();
}

/*****************************************************************/
/*startbit S1:rising edge on Din while SCLOCK high   *************/
/*****************************************************************/
void _startBit(void)
{ 
	SCLOCK = 0;    _nop_(); 
	DIN    = 0;    _nop_(); 
	SCLOCK = 1;    _nop_(); 
	DIN    = 1;    _nop_(); 
	SCLOCK = 0;    _nop_(); 
}

/*****************************************************************/
/* stopbit ES1:falling edge on Din while SCLOCK high  ************/
/*****************************************************************/
void _stopBit(void)
{ 
	SCLOCK = 0;  _nop_();
	DIN    = 1;  _nop_();
	SCLOCK = 1;  _nop_();
	DIN    = 0;  _nop_();
	SCLOCK = 0;  _nop_();
}
/*****************************************************************/
/* find S2:  a SOF sent by the TAG *******************************/
/*****************************************************************/
uchar _findS2(void)
{
	uchar S2=0;
	while ((!SCLOCK)&&(!TIMERINT));	//等到SCLK变高
	if (SCLOCK)						//sclk变到高电平
	{
		while ((SCLOCK)&&(!TIMERINT)&&(!DOUT));	//等到dout输出为高
		if (DOUT)	//dout已经为高电平
		{
			while ((SCLOCK)&&(!TIMERINT)&&(DOUT));//等sclk变为低电平，dout为高
			if (!SCLOCK)
			{
				S2 = 1;	//找到起始信号
			}
		}
	}
	return (S2);
}

/*****************************************************************/
/* readbit:read data from DOUT*************************************/
/*****************************************************************/
uchar _readbit(void)
{
/*
	uchar i, sample;
	uchar debounce=1; 					// min clockpulse is 4.7us for 106kBaud
	bit doutstore = 0;
	while ((!SCLOCK)&&(!TIMERINT)); 	//wait for rising edge
	
	for (i=0; i<debounce;i++);	
	if (SCLOCK)
	{
		if(ERR)
		{  
			if(ERR) 
			{ 
				sample = 2; 		//冲撞
				return (sample); 
			}
		}
		doutstore=DOUT;

		if (DOUT)
			sample = 1;
		else
			sample = 0; 				//store sample: no debouncing!

		
		while ((SCLOCK)&&(!TIMERINT)&&(doutstore==DOUT));	//等到sclk变为低电平，等待下个数据位
		
		if ((SCLOCK)&&(doutstore != DOUT) )		// ES2
		{
			sample = 0x03;
		}
		else if (TIMERINT)						// timeout
		{
			sample = 0x04;
		}	  
	}
	return(sample); 
*/
	uchar i, sample, doutstore;
	uchar debounce=1; 					// min clockpulse is 4.7us for 106kBaud
	while ((!SCLOCK)&&(!TIMERINT)); 	//wait for rising edge
   
  	for (i=0; i<debounce;i++); 
  	if (SCLOCK)
	{
		if(ERR)
		{  
			if(ERR) { sample = 2; return (sample); }
		}
		doutstore=DOUT;
		if (!DOUT)
			sample = 0;
		else
			sample = 1; 				//store sample: no debouncing!
		
		while ((SCLOCK)&&(!TIMERINT)&&(doutstore ==DOUT));
		
		if ((SCLOCK)&&(doutstore != DOUT) )		// ES2
		{
			sample = 0x03;
		}
		else if (TIMERINT)						// timeout
		{
			sample = 0x04;
		}	  
	}
	return(sample);  
}

/*****************************************************************/
/***read on DOUT and write on DIN, with uctrl master of clock.****/
/*****************************************************************/

uchar _rwbit(uchar wbit)
{ 
	uchar i, rbit;
	if(wbit)
		DIN = 1;
	else
		DIN = 0;
	SCLOCK = 1;
	DOUT = 1;
	for (i=0;i<2;i++); //dummy
	if (!DOUT)
		rbit=0;
	else
		rbit=1;
	SCLOCK = 0;
	return (rbit);
}
/*****************************************************************/