--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/onewire.h	Wed May 09 00:22:28 2012 +0800
@@ -0,0 +1,93 @@
+#ifndef ONEWIRE_H_
+#define ONEWIRE_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.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_CPU < 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_CPU ) )
+#endif
+
+// Recovery time (T_Rec) minimum 1usec - increase for long lines 
+// 5 usecs is a value give in some Maxim AppNotes
+// 30u secs seem to be reliable for longer lines
+//#define OW_RECOVERY_TIME        5  /* usec */
+//#define OW_RECOVERY_TIME      300 /* usec */
+#define OW_RECOVERY_TIME         10 /* usec */
+
+// Use AVR's internal pull-up resistor instead of external 4,7k resistor.
+// Based on information from Sascha Schade. Experimental but worked in tests
+// with one DS18B20 and one DS18S20 on a rather short bus (60cm), where both 
+// sensores have been parasite-powered.
+#define OW_USE_INTERNAL_PULLUP     1  /* 0=external, 1=internal */
+
+/*******************************************/
+
+
+#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
+
+// 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_command_with_parasite_enable( 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
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif