/* 
 Delay functions taken from PICC examples
 
 I2C functions assume use of onboard i2c

*/

/*
 *	Delay functions for HI-TECH C on the PIC
 *
 *	Functions available:
 *		DelayUs(x)	Delay specified number of microseconds
 *		DelayMs(x)	Delay specified number of milliseconds
 *
 *	Note that there are range limits: x must not exceed 255 - for xtal
 *	frequencies > 12MHz the range for DelayUs is even smaller.
 *	To use DelayUs it is only necessary to include this file; to use
 *	DelayMs you must include delay.c in your project.
 *
 */


/* I2C  Functions

  i2c_idle();      -- waits for idle condition on I2C interface
  i2c_Start();     -- sends start and waits for finish of start
  extern i2c_Stop(); -- sends stop and waits for finish of stop
  i2c_doAck();      -- send Ack and waits for finish of Ack
  i2c_doNak();      -- send Nck and waits for finish of Ack

  i2c_WriteTo(unsigned char addr); -- initiates i2c cycle to device at addr

  i2c_PutByte(unsigned char byte);  -- sends byte on i2c bus, check idle first
  i2c_FastPutByte(unsigned char byte); -- same as previous, do not check idle

  unsigned char i2c_GetByte(); -- read byte from i2c bus


*/

/* Microchip 24LC515 Functions

   
   Random Write - writes  one byte (val) to RAM designated by 'cmd'
    to 'addr'. Waits for write to finish via 5 ms delay
 void mem_write(unsigned char cmd,unsigned char val, int addr);

   Block Write - writes  one block of bytes (64 byte buffer pointed to 
   by 'buf' ) to RAM designated by 'cmd' starting at 'addr'.  DOES NOT
   WAIT FOR WRITE TO FINISH upon return, so you either have to check for
   end-of-write or delay for 5 ms before calling this again.
 
  void block_mem_write(unsigned char cmd,int addr, char *buf);


   Random Read - writes  one byte from RAM designated by 'cmd'
    from 'addr'. 
   unsigned char mem_read(unsigned char cmd,int addr);


   Block Read - reads  one block of bytes from RAM designated by 'cmd' 
   starting at 'addr'; 64 bytes returns in 'buf'.

    extern void block_mem_read(unsigned char cmd,int addr,char *buf);


MISSING FUNCTIONS
  
   There should be some functions that check for end of write...

 */

#if 0
#define	XTAL_FREQ	3686L		/* Crystal frequency in KHZ*/
#endif
#define	XTAL_FREQ	14745L		/* Crystal frequency in KHZ*/

#define	MHZ	*1000L			/* number of kHz in a MHz */
#define	KHZ	*1			/* number of kHz in a kHz */

#if	XTAL_FREQ >= 12MHZ

#define	DelayUs(x)	{ unsigned char _dcnt; \
			  _dcnt = (x)*((XTAL_FREQ)/(12MHZ)); \
			  while(--_dcnt != 0) \
				  continue; }
#else

#define	DelayUs(x)	{ unsigned char _dcnt; \
			  _dcnt = (x)/((12MHZ)/(XTAL_FREQ))|1; \
			  while(--_dcnt != 0) \
				  continue; }
#endif


extern void DelayMs(unsigned char);

extern i2c_idle();
extern i2c_Start();
extern i2c_Stop();
extern i2c_doAck();
extern i2c_doNak();


extern i2c_WriteTo(unsigned char addr);


extern i2c_PutByte(unsigned char byte);
extern i2c_FastPutByte(unsigned char byte);

extern unsigned char i2c_GetByte();


extern void mem_write(unsigned char cmd,unsigned char val, int addr);
extern void block_mem_write(unsigned char cmd,int addr, char *buf);
extern unsigned char mem_read(unsigned char cmd,int addr);
extern void block_mem_read(unsigned char cmd,int addr,char *buf);







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