--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/1wire.h	Wed Feb 08 10:37:22 2012 +1030
@@ -0,0 +1,95 @@
+/*
+ * 1 wire header which defines functions and constants
+ *
+ * $Id$
+ *
+ * Copyright (c) 2004
+ *      Daniel O'Connor <darius@dons.net.au>.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef PROGMEM
+#define PROGMEM
+#endif
+
+void		OWInit(void);
+uint8_t		OWTouchReset(void);
+void		OWWriteBit(uint8_t bit);
+uint8_t		OWReadBit(void);
+void		OWWriteByte(uint8_t data);
+uint8_t		OWReadByte(void);
+uint8_t		OWTouchByte(uint8_t data);
+void		OWBlock(uint8_t *data, int len);
+uint8_t		OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only);
+uint8_t		OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only);
+void		OWCRC(uint8_t x, uint8_t *crc);
+void		OWSendCmd(uint8_t *ROM, uint8_t cmd);
+uint8_t		OWProgROM(uint8_t *ROM, uint8_t start, uint8_t len, uint8_t *data, uint8_t exact, uint8_t status);
+int16_t		OWGetTemp(uint8_t *ROM);
+const PROGMEM char *OWTempStatusStr(int16_t val, uint8_t shrt);
+extern const PROGMEM char *OWProgROM_Status[];
+
+
+/* Return codes for OWFirst()/OWNext() */
+#define OW_BADWIRE		-3
+#define OW_BADCRC		-2
+#define OW_NOPRESENCE		-1
+#define OW_NOMODULES		0
+#define OW_FOUND		1
+
+/* General 1 wire commands */
+#define OW_OVRDRV_SKIP_CMD	0x3c
+#define OW_SEARCH_ALRM_CMD	0xec
+#define OW_SEARCH_ROM_CMD	0xf0
+#define OW_READ_ROM_CMD		0x33
+#define OW_MATCH_ROM_CMD	0x55
+#define OW_SKIP_ROM_CMD		0xcc
+
+/* DS1820 commands */
+#define OW_CONVERTT_CMD		0x44
+#define OW_RD_SCR_CMD		0xbe
+#define OW_WR_SCR_CMD		0x4e
+#define OW_CPY_SCR_CMD		0x48
+#define OW_RECALL_CMD		0xb8
+#define OW_RD_PSU_CMD		0xb4
+
+/* DS2502 commands */
+#define OW_READ_MEMORY		0xf0
+#define OW_READ_STATUS		0xaa
+#define OW_GEN_CRC		0xc3
+#define OW_WRITE_MEMORY		0x0f
+#define OW_WRITE_STATUS		0x55
+
+/* Family codes */
+#define OW_FAMILY_ROM		0x09
+#define OW_FAMILY_TEMP		0x10
+
+/* Return codes for OWGetTemp */
+#define OW_TEMP_BADVAL		-6000
+#define OW_TEMP_WRONG_FAM	-6001
+#define OW_TEMP_CRC_ERR		-6002
+#define OW_TEMP_NO_ROM		-6003
+
+/* Helpers for OWGetTemp's number system */
+#define GETWHOLE(x)	((x) / 100)
+#define GETFRAC(x)	abs((x) - (GETWHOLE(x) * 100))