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annotate wh1080_dev.h @ 5:b22a888eb975

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Remove page1_*_pressure - it appears to be old code and is unused.
author Daniel O'Connor <darius@dons.net.au>
date Thu, 11 Feb 2010 12:44:56 +1030
parents 9dab44dcb331
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * WH-1080 data input utility.
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3 * This bases on code supplied to me by Steve Woodford.
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4 *
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5 * Greg Lehey, 16 November 2009
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6 *
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7 * $Id: wh1080_dev.h,v 1.4 2009/12/08 01:03:12 grog Exp grog $
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8 */
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9
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10 #ifdef linux
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11 /*
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12 * I wish I understood linux header files. This whole thing looks like a mess.
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13 * If you can explain it to me, please do.
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14 */
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15 #include <endian.h>
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16 #include <asm/byteorder.h>
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17 #define htobe16 __cpu_to_be16
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18 #define le16toh __le16_to_cpu
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19 #include <time.h>
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20 #else
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21 #include <sys/endian.h>
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22 #endif
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23 /*
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24 * This file describes the WH-1080 weather station as well as I can understand
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25 * it. The station is not documented, and I've pulled this together from
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26 * various source code written by others without access to documentation.
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27 */
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29 /* Vendor and product number for WH-1080 */
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30 #define WH1080_USB_VENDOR 0x1941
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31 #define WH1080_USB_PRODUCT 0x8021
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33 #define WH1080_PAGE_SIZE 32
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34 #define WH1080_PAGE_MASK (~ (WH1080_PAGE_SIZE - 1))
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35
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36 /* Offsets of the first 2 pages */
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37 #define WH1080_PAGE0 0
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38 #define WH1080_PAGE1 0x20
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39 /* First archive record appears to start here */
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40 #define WH1080_FIRST_ARCHIVE 0x100
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41 /* And the last one must be here */
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42 #define WH1080_LAST_ARCHIVE 0xfff0
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43 /* And thus there appear to be this many of them. */
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44 #define WH1080_ARCHIVE_COUNT 4088
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45 /* The records swap this often, in seconds */
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46 #define WH1080_ARCHIVE_INTERVAL 1800
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47 /* Size of archive record */
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48 #define WH1080_ARCHIVE_RECORD_SIZE 16
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49
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50 /* Descriptor stuff. I'm not sure what this is all about. XXX */
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51 #define WH1080_DESCRIPTOR1_SIZE 18
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52 #define WH1080_DESCRIPTOR2_SIZE 9
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53 /*
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54 * Steve Woodford has:
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55 * #define WH1080_DESCRIPTOR3_SIZE 34
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56 * #define WH1080_DESCRIPTOR34_SIZE 0x74
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57 */
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58 #define WH1080_DESCRIPTOR3_SIZE 34
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59 #define WH1080_DESCRIPTOR34_SIZE 0x74
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60
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61 /*
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62 * The device appears to have its data stored in pages of 32 bytes. I have very
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63 * little information beyond what I've gleaned from other people's code, so some
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64 * of this looks very strange.
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65 *
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66 * The following structures define what we know of the first two pages.
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67 */
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68 struct wh1080_page0
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69 {
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70 uint64_t magic; /* one of apparently 2 different magic numbers */
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71 uint64_t magic2;
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72 char mumble [14];
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73 uint16_t current_page; /* byte offset of current readings */
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74 };
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75
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76 /* These seem to be alternate values. No idea why. */
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77 #if BYTE_ORDER == LITTLE_ENDIAN
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78 /* XXX find out which endian this is */
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79 #define WH1080_PAGE0_MAGIC1A 0xffffffffffffaa55ull
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80 #define WH1080_PAGE0_MAGIC1B 0xffffffffffaaaa55ull
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81 #define WH1080_PAGE0_MAGIC2 0xffffffffffffffffull
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82 #else
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83 #define WH1080_PAGE0_MAGIC1A 0x55aaffffffffffffull
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84 #define WH1080_PAGE0_MAGIC1B 0x55aaaaffffffffffull
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85 #define WH1080_PAGE0_MAGIC2 0xffffffffffffffffull
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86 #endif
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87 /* It's not clear what the purpose of page 1 is. One pressure reading comes with the current data. */
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88 struct wh1080_page1
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89 {
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90 uint16_t rel_pressure; /* hPa / 10 */
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91 uint16_t abs_pressure; /* hPa / 10 */
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92 char mumble1 [28];
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93 };
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94
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95 /*
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96 * At least current weather data looks like this. This record should be exactly
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97 * 16 bytes long.
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98 */
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99 struct wh1080_readings
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100 { /* offset: */
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101 uint8_t last_save_mins; /* 0: last save minutes (?) */
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102 uint8_t inside_humidity; /* 1: humidity in percent */
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103 int16_t inside_temp; /* 2: inside temperature, °C/10 */
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104 uint8_t outside_humidity; /* 4: humidity in percent */
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105 int16_t outside_temp; /* 5: outside temperature, °C/10 */
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106 uint16_t pressure; /* 7: absolute pressure, hPa / 10 */
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107 uint8_t wind_speed; /* 9: wind speed in m/s/10, up to 25.5 m/s */
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108 uint8_t wind_gust; /* 10: wind gust speed in m/s/10, up to 25.5 m/s */
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109 char mumble1; /* 11: apparently unused byte */
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110 /*
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111 * wind direction is a number between 0 and 15, repesenting increments of
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112 * 22.5°. It may also have the value 0x80 if there's no wind at all.
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113 */
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114 uint8_t wind_direction; /* 12: */
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115 /*
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116 * Rainfall is measured in units of 0.3 mm, and the value returned is a
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117 * counter. There's only real rainfall if the value returned here is
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118 * different from the previous reading.
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119 */
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120 uint16_t rain; /* 13: */
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121 char mumble2; /* 15: pad to 16 bytes */
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122 } __packed;
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123