hc595drv.c

包含了８位ＣＲＣ算化程序

/**************** (c) 2007 **********************************************************   
COMPILER : 		C compiler
FILE     : 		Hc595Drv.c
VERSION  :  	1.0
DATE	 : 		2007/2/12
Author   : 		flydragon
************************************************************************************/

#define LEFT_MOVE	/* if define LEFT ,data from right move to left,else to right */

//#define POSITIVE	/*驱动二极管，共阳定义POSITIVE，否则为共阴*/

//#define DELAYTIME 0	/* delay NOP counters */

#include "hc595drv.h"

/******************************************************************************
Function:		DelayTime
Description:	Delay time 
Arguments:		time	is delay clock counter
Returns:		none
Notes:			none
*******************************************************************************/
void DelayTime(void)
{
asm NOP
asm NOP
asm NOP
}
   
/****************************************************************************
Function:	Hc595drv
Description:	
Arguments:	address		 	is  output data start address ;
			bitcounter 		is  move bit counters;
Returns:	none
Notes:		
******************************************************************************/
void Hc595drv(unsigned char*inaddress,unsigned char bitcounter)
{
	unsigned char i,bit;
	unsigned char bitcnt = 0;
	unsigned char Data[2];
	unsigned char *address;
	
	Data[1] = * inaddress;
	Data[0] = *(inaddress - 1);
	address = &Data[1];
	
	HC595_LCLK = 0;	
	
	HC595_OE = 1;
	
	for(i=0;i<bitcounter;i++)
		{
			
		#ifdef LEFT_MOVE
		bit = *(address) & 0x80;
		*(address) = (*(address)) << 1;
		#else
		bit = *(address) & 0x01;
		*(address) = (*(address)) >> 1;
		#endif
				
		HC595_CLK = 0;	
				
		if(bit != 0)
			{
			#ifdef POSITIVE
			
			HC595_DATA = 0;	
			#else
			
			HC595_DATA = 1;	
			#endif
			}
		else
			{
			#ifdef POSITIVE
			
			HC595_DATA = 1;	
			#else
			
			HC595_DATA = 0;	
			#endif
			}
					
		bitcnt ++;
		if(bitcnt >= 8)
			{bitcnt = 0;address--;}
				
		HC595_CLK = 1;	
		
		
		}
					
		HC595_DATA = 0;	
		HC595_LCLK = 1;
		
		HC595_OE = 0;
		
}
/****************************************************************************
Function:	Hc595drv
Description:	
Arguments:	address		 	is  output data start address ;
			bitcounter 		is  move bit counters;
Returns:	none
Notes:		
******************************************************************************/
void Hc595drv_B(unsigned char*inaddress,unsigned char bitcounter)
{
	unsigned char i,bit;
	unsigned char bitcnt = 0;
	unsigned char Data[2];
	unsigned char *address;
	
	Data[1] = * inaddress;
	Data[0] = *(inaddress - 1);
	address = &Data[1];
	
	HC595_LCLK = 0;	
	HC595_DATA = 1;						//OE
	
	for(i=0;i<bitcounter;i++)
		{
			
		#ifdef LEFT_MOVE
		bit = *(address) & 0x80;
		*(address) = (*(address)) << 1;
		#else
		bit = *(address) & 0x01;
		*(address) = (*(address)) >> 1;
		#endif
				
		HC595_CLK = 0;	
						
		if(bit != 0)
			{
			#ifdef POSITIVE
			
			HC595_OE = 0;	
			#else
			
			HC595_OE = 1;	
			#endif
			}
		else
			{
			#ifdef POSITIVE
			
			HC595_OE = 1;	
			#else
			
			HC595_OE = 0;		//DATA
			#endif
			}
		bitcnt ++;
		if(bitcnt >= 8)
			{bitcnt = 0;address--;}			
		
		HC595_CLK = 1;			
		
		}
					
		HC595_OE = 0;		//DATA
		HC595_LCLK = 1;
		
		HC595_DATA = 0;		//OE
		
}


/******2007/2/24*(c)* ******End of file***********************************/