onewire.h

ds18b20原版程序!!已经调试通过了！！！

#ifndef _1wire_h_
#define _1wire_h_

#include <inttypes.h>

/*******************************************/
/* Hardware connection                     */
/*******************************************/

/* Define OW_ONE_BUS if only one 1-Wire-Bus is used
   in the application -> shorter code.
   If not defined make sure to call ow_set_bus() before using 
   a bus. Runtime bus-select increases code size by around 300 
   bytes so use OW_ONE_BUS if possible */
//#define OW_ONE_BUS

#ifdef OW_ONE_BUS

#define OW_PIN  PD6
#define OW_IN   PIND
#define OW_OUT  PORTD
#define OW_DDR  DDRD
#define OW_CONF_DELAYOFFSET 0

#else 
#if F_OSC<1843200
 #warning | experimental multi-bus-mode is not tested for 
 #warning | frequencies below 1,84MHz - use OW_ONE_WIRE or
 #warning | faster clock-source (i.e. internal 2MHz R/C-Osc.)
#endif
#define OW_CONF_CYCLESPERACCESS 13
#define OW_CONF_DELAYOFFSET ( (uint16_t)( ((OW_CONF_CYCLESPERACCESS)*1000000L) / F_OSC  ) )
#endif

/*******************************************/

// #define OW_SHORT_CIRCUIT  0x01

#define OW_MATCH_ROM	0x55
#define OW_SKIP_ROM	    0xCC
#define	OW_SEARCH_ROM	0xF0

#define	OW_SEARCH_FIRST	0xFF		// start new search
#define	OW_PRESENCE_ERR	0xFF
#define	OW_DATA_ERR	    0xFE
#define OW_LAST_DEVICE	0x00		// last device found
//			0x01 ... 0x40: continue searching

// rom-code size including CRC
#define OW_ROMCODE_SIZE 8

extern uint8_t ow_reset(void);

extern uint8_t ow_bit_io( uint8_t b );
extern uint8_t ow_byte_wr( uint8_t b );
extern uint8_t ow_byte_rd( void );

extern uint8_t ow_rom_search( uint8_t diff, uint8_t *id );

extern void ow_command( uint8_t command, uint8_t *id );

extern void ow_parasite_enable(void);
extern void ow_parasite_disable(void);
extern uint8_t ow_input_pin_state(void);

#ifndef OW_ONE_BUS
extern void ow_set_bus(volatile uint8_t* in,
	volatile uint8_t* out,
	volatile uint8_t* ddr,
	uint8_t pin);
#endif

#endif