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1 /*
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2 * 1 wire header which defines functions and constants
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3 *
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4 * Copyright (c) 2004
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5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 void OWInit(void);
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30 uint8_t OWTouchReset(void);
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31 void OWWriteBit(uint8_t bit);
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32 uint8_t OWReadBit(void);
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33 void OWWriteByte(uint8_t data);
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34 uint8_t OWReadByte(void);
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35 uint8_t OWTouchByte(uint8_t data);
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36 void OWBlock(uint8_t *data, int len);
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37 uint8_t OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only);
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38 uint8_t OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only);
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39 void OWCRC(uint8_t x, uint8_t *crc);
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40 void OWSendCmd(uint8_t *ROM, uint8_t cmd);
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41 uint8_t OWProgROM(uint8_t *ROM, uint8_t start, uint8_t len, uint8_t *data, uint8_t exact, uint8_t status);
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42 int16_t OWGetTemp(uint8_t *ROM);
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19
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43 PROGMEM const char *OWTempStatusStr(int16_t val, uint8_t shrt);
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44 extern PGM_P const OWProgROM_Status[] PROGMEM;
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0
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45
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46 /* Return codes for OWFirst()/OWNext() */
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47 #define OW_BADWIRE -3
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48 #define OW_BADCRC -2
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49 #define OW_NOPRESENCE -1
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50 #define OW_NOMODULES 0
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51 #define OW_FOUND 1
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52
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53 /* General 1 wire commands */
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54 #define OW_OVRDRV_SKIP_CMD 0x3c
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55 #define OW_SEARCH_ALRM_CMD 0xec
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56 #define OW_SEARCH_ROM_CMD 0xf0
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57 #define OW_READ_ROM_CMD 0x33
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58 #define OW_MATCH_ROM_CMD 0x55
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59 #define OW_SKIP_ROM_CMD 0xcc
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60
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61 /* DS1820 commands */
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62 #define OW_CONVERTT_CMD 0x44
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63 #define OW_RD_SCR_CMD 0xbe
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64 #define OW_WR_SCR_CMD 0x4e
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65 #define OW_CPY_SCR_CMD 0x48
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66 #define OW_RECALL_CMD 0xb8
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67 #define OW_RD_PSU_CMD 0xb4
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68
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69 /* DS2502 commands */
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70 #define OW_READ_MEMORY 0xf0
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71 #define OW_READ_STATUS 0xaa
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72 #define OW_GEN_CRC 0xc3
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73 #define OW_WRITE_MEMORY 0x0f
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74 #define OW_WRITE_STATUS 0x55
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75
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76 /* Family codes */
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77 #define OW_FAMILY_ROM 0x09
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78 #define OW_FAMILY_TEMP 0x10
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79
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80 /* Return codes for OWGetTemp */
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81 #define OW_TEMP_BADVAL -6000
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82 #define OW_TEMP_WRONG_FAM -6001
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83 #define OW_TEMP_CRC_ERR -6002
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84 #define OW_TEMP_NO_ROM -6003
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85
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86 /* Helpers for OWGetTemp's number system */
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87 #define GETWHOLE(x) ((x) / 100)
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88 #define GETFRAC(x) abs((x) - (GETWHOLE(x) * 100))
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