--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ds18x20.h	Fri May 18 23:57:08 2012 +0800
@@ -0,0 +1,140 @@
+#ifndef DS18X20_H_
+#define DS18X20_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <stdint.h>
+
+// DS18x20 EERPROM support disabled(0) or enabled(1) :
+#define DS18X20_EEPROMSUPPORT     1
+// decicelsius functions disabled(0) or enabled(1):
+#define DS18X20_DECICELSIUS       1
+// max. resolution functions disabled(0) or enabled(1):
+#define DS18X20_MAX_RESOLUTION    1
+// extended output via UART disabled(0) or enabled(1) :
+#define DS18X20_VERBOSE           1
+
+
+/* return values */
+#define DS18X20_OK                0x00
+#define DS18X20_ERROR             0x01
+#define DS18X20_START_FAIL        0x02
+#define DS18X20_ERROR_CRC         0x03
+
+#define DS18X20_INVALID_DECICELSIUS  2000
+
+#define DS18X20_POWER_PARASITE    0x00
+#define DS18X20_POWER_EXTERN      0x01
+
+#define DS18X20_CONVERSION_DONE   0x00
+#define DS18X20_CONVERTING        0x01
+
+/* DS18X20 specific values (see datasheet) */
+#define DS18S20_FAMILY_CODE       0x10
+#define DS18B20_FAMILY_CODE       0x28
+#define DS1822_FAMILY_CODE        0x22
+
+#define DS18X20_CONVERT_T         0x44
+#define DS18X20_READ              0xBE
+#define DS18X20_WRITE             0x4E
+#define DS18X20_EE_WRITE          0x48
+#define DS18X20_EE_RECALL         0xB8
+#define DS18X20_READ_POWER_SUPPLY 0xB4
+
+#define DS18B20_CONF_REG          4
+#define DS18B20_9_BIT             0
+#define DS18B20_10_BIT            (1<<5)
+#define DS18B20_11_BIT            (1<<6)
+#define DS18B20_12_BIT            ((1<<6)|(1<<5))
+#define DS18B20_RES_MASK          ((1<<6)|(1<<5))
+
+// undefined bits in LSB if 18B20 != 12bit
+#define DS18B20_9_BIT_UNDF        ((1<<0)|(1<<1)|(1<<2))
+#define DS18B20_10_BIT_UNDF       ((1<<0)|(1<<1))
+#define DS18B20_11_BIT_UNDF       ((1<<0))
+#define DS18B20_12_BIT_UNDF       0
+
+// conversion times in milliseconds
+#define DS18B20_TCONV_12BIT       750
+#define DS18B20_TCONV_11BIT       DS18B20_TCONV_12_BIT/2
+#define DS18B20_TCONV_10BIT       DS18B20_TCONV_12_BIT/4
+#define DS18B20_TCONV_9BIT        DS18B20_TCONV_12_BIT/8
+#define DS18S20_TCONV             DS18B20_TCONV_12_BIT
+
+// constant to convert the fraction bits to cel*(10^-4)
+#define DS18X20_FRACCONV          625
+
+// scratchpad size in bytes
+#define DS18X20_SP_SIZE           9
+
+// DS18X20 EEPROM-Support
+#define DS18X20_WRITE_SCRATCHPAD  0x4E
+#define DS18X20_COPY_SCRATCHPAD   0x48
+#define DS18X20_RECALL_E2         0xB8
+#define DS18X20_COPYSP_DELAY      10 /* ms */
+#define DS18X20_TH_REG            2
+#define DS18X20_TL_REG            3
+
+#define DS18X20_DECIMAL_CHAR      '.'
+
+
+extern uint8_t DS18X20_find_sensor(uint8_t *diff, 
+	uint8_t id[]);
+extern uint8_t DS18X20_get_power_status(uint8_t id[]);
+extern uint8_t DS18X20_start_meas( uint8_t with_external,
+	uint8_t id[]);
+// returns 1 if conversion is in progress, 0 if finished
+// not available when parasite powered
+extern uint8_t DS18X20_conversion_in_progress(void);
+
+
+#if DS18X20_DECICELSIUS
+extern uint8_t DS18X20_read_decicelsius( uint8_t id[],
+	int16_t *decicelsius );
+extern uint8_t DS18X20_read_decicelsius_single( uint8_t familycode,
+	int16_t *decicelsius );
+extern uint8_t DS18X20_format_from_decicelsius( int16_t decicelsius, 
+	char s[], uint8_t n);
+#endif /* DS18X20_DECICELSIUS */
+
+
+#if DS18X20_MAX_RESOLUTION
+// temperature unit for max. resolution is �C * 10e-4
+// examples: -250625 -> -25.0625�C, 1250000 -> 125.0000 �C
+extern uint8_t DS18X20_read_maxres( uint8_t id[],
+	int32_t *temperaturevalue );
+extern uint8_t DS18X20_read_maxres_single( uint8_t familycode,
+	int32_t *temperaturevalue );
+extern uint8_t DS18X20_format_from_maxres( int32_t temperaturevalue, 
+	char s[], uint8_t n);
+#endif /* DS18X20_MAX_RESOLUTION */
+
+
+#if DS18X20_EEPROMSUPPORT
+// write th, tl and config-register to scratchpad (config ignored on DS18S20)
+uint8_t DS18X20_write_scratchpad( uint8_t id[], 
+	uint8_t th, uint8_t tl, uint8_t conf);
+// read scratchpad into array SP
+uint8_t DS18X20_read_scratchpad( uint8_t id[], uint8_t sp[], uint8_t n);
+// copy values int scratchpad into DS18x20 eeprom
+uint8_t DS18X20_scratchpad_to_eeprom( uint8_t with_power_extern,
+	uint8_t id[] );
+// copy values from DS18x20 eeprom into scratchpad
+uint8_t DS18X20_eeprom_to_scratchpad( uint8_t id[] );
+#endif /* DS18X20_EEPROMSUPPORT */
+
+
+#if DS18X20_VERBOSE
+extern void DS18X20_show_id_uart( uint8_t *id, size_t n );
+extern uint8_t DS18X20_read_meas_all_verbose( void );
+#endif /* DS18X20_VERBOSE */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif