Mercurial > public > ostc4
annotate ostc4pack/src/crcmodel.h @ 503:734f7ad46bca
Bugfix display of disabled screen.
It is possible to select a screen as default which is in parallel disabled in the selection view. To avoid this the enable / disable state is not also checked when entering dive mode. The check function was depending on an ACTION. The functionality has been changed to allow the function call without ACTION.
Changed setting of compass circle position from constant position to variable
This was needed to reuse the same function in several views with different compass position
Added new views Navigation and Depth data
Both views were basically already available but the idea behind the layout is to combine all information needed for navigation dives (compass + timer) in one view. The classic maxdepth view just showed the maxdepth with a black box on the right side. this box is now used for display of average depth (shown in classic view Stopwatch)
Minor changes in compass paint function to improve code readability
Use same Y offset for all views
While switching across the views some number were shown ~20 pixel higher than others. This was caused by the usage of the line selection which works for some fonts but not for all => set linenumber to 0 for all views
author | Ideenmodellierer |
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date | Mon, 24 Aug 2020 19:53:27 +0200 |
parents | b70fae5023b4 |
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rev | line source |
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1 /******************************************************************************/ |
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2 /* */ |
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3 /* Author : Ross Williams (ross@guest.adelaide.edu.au.). */ |
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4 /* Date : 3 June 1993. */ |
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5 /* Status : Public domain. */ |
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6 /* */ |
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7 /* Description : This is the header (.h) file for the reference */ |
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8 /* implementation of the Rocksoft^tm Model CRC Algorithm. For more */ |
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9 /* information on the Rocksoft^tm Model CRC Algorithm, see the document */ |
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10 /* titled "A Painless Guide to CRC Error Detection Algorithms" by Ross */ |
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11 /* Williams (ross@guest.adelaide.edu.au.). This document is likely to be in */ |
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12 /* "ftp.adelaide.edu.au/pub/rocksoft". */ |
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13 /* */ |
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14 /* Note: Rocksoft is a trademark of Rocksoft Pty Ltd, Adelaide, Australia. */ |
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15 /* */ |
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16 /******************************************************************************/ |
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17 /* */ |
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18 /* How to Use This Package */ |
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19 /* ----------------------- */ |
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20 /* Step 1: Declare a variable of type cm_t. Declare another variable */ |
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21 /* (p_cm say) of type p_cm_t and initialize it to point to the first */ |
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22 /* variable (e.g. p_cm_t p_cm = &cm_t). */ |
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23 /* */ |
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24 /* Step 2: Assign values to the parameter fields of the structure. */ |
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25 /* If you don't know what to assign, see the document cited earlier. */ |
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26 /* For example: */ |
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27 /* p_cm->cm_width = 16; */ |
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28 /* p_cm->cm_poly = 0x8005L; */ |
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29 /* p_cm->cm_init = 0L; */ |
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30 /* p_cm->cm_refin = TRUE; */ |
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31 /* p_cm->cm_refot = TRUE; */ |
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32 /* p_cm->cm_xorot = 0L; */ |
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33 /* Note: Poly is specified without its top bit (18005 becomes 8005). */ |
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34 /* Note: Width is one bit less than the raw poly width. */ |
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35 /* */ |
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36 /* Step 3: Initialize the instance with a call cm_ini(p_cm); */ |
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37 /* */ |
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38 /* Step 4: Process zero or more message bytes by placing zero or more */ |
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39 /* successive calls to cm_nxt. Example: cm_nxt(p_cm,ch); */ |
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40 /* */ |
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41 /* Step 5: Extract the CRC value at any time by calling crc = cm_crc(p_cm); */ |
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42 /* If the CRC is a 16-bit value, it will be in the bottom 16 bits. */ |
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43 /* */ |
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44 /******************************************************************************/ |
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45 /* */ |
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46 /* Design Notes */ |
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47 /* ------------ */ |
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48 /* PORTABILITY: This package has been coded very conservatively so that */ |
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49 /* it will run on as many machines as possible. For example, all external */ |
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50 /* identifiers have been restricted to 6 characters and all internal ones to */ |
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51 /* 8 characters. The prefix cm (for Crc Model) is used as an attempt to avoid */ |
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52 /* namespace collisions. This package is endian independent. */ |
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53 /* */ |
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54 /* EFFICIENCY: This package (and its interface) is not designed for */ |
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55 /* speed. The purpose of this package is to act as a well-defined reference */ |
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56 /* model for the specification of CRC algorithms. If you want speed, cook up */ |
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57 /* a specific table-driven implementation as described in the document cited */ |
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58 /* above. This package is designed for validation only; if you have found or */ |
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59 /* implemented a CRC algorithm and wish to describe it as a set of parameters */ |
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60 /* to the Rocksoft^tm Model CRC Algorithm, your CRC algorithm implementation */ |
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61 /* should behave identically to this package under those parameters. */ |
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62 /* */ |
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63 /******************************************************************************/ |
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64 |
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65 /* The following #ifndef encloses this entire */ |
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66 /* header file, rendering it indempotent. */ |
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67 #ifndef CM_DONE |
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68 #define CM_DONE |
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69 |
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70 /******************************************************************************/ |
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71 |
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72 /* The following definitions are extracted from my style header file which */ |
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73 /* would be cumbersome to distribute with this package. The DONE_STYLE is the */ |
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74 /* idempotence symbol used in my style header file. */ |
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75 |
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76 #ifndef DONE_STYLE |
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77 |
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78 typedef unsigned long ulong; |
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79 typedef unsigned bool; |
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80 typedef unsigned char *p_ubyte_; |
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81 |
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82 #ifndef TRUE |
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83 #define FALSE 0 |
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84 #define TRUE 1 |
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85 #endif |
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86 |
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87 /* Change to the second definition if you don't have prototypes. */ |
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88 #define P_(A) A |
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89 /* #define P_(A) () */ |
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90 |
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91 /* Uncomment this definition if you don't have void. */ |
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92 /* typedef int void; */ |
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93 |
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94 #endif |
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95 |
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96 /******************************************************************************/ |
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97 |
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98 /* CRC Model Abstract Type */ |
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99 /* ----------------------- */ |
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100 /* The following type stores the context of an executing instance of the */ |
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101 /* model algorithm. Most of the fields are model parameters which must be */ |
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102 /* set before the first initializing call to cm_ini. */ |
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103 typedef struct { |
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104 int cm_width; /* Parameter: Width in bits [8,32]. */ |
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105 ulong cm_poly; /* Parameter: The algorithm's polynomial. */ |
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106 ulong cm_init; /* Parameter: Initial register value. */ |
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107 bool cm_refin; /* Parameter: Reflect input bytes? */ |
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108 bool cm_refot; /* Parameter: Reflect output CRC? */ |
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109 ulong cm_xorot; /* Parameter: XOR this to output CRC. */ |
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110 |
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111 ulong cm_reg; /* Context: Context during execution. */ |
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112 } cm_t; |
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113 typedef cm_t *p_cm_t; |
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114 |
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115 /******************************************************************************/ |
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116 |
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117 /* Functions That Implement The Model */ |
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118 /* ---------------------------------- */ |
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119 /* The following functions animate the cm_t abstraction. */ |
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120 |
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121 void cm_ini P_((p_cm_t p_cm)); |
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122 /* Initializes the argument CRC model instance. */ |
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123 /* All parameter fields must be set before calling this. */ |
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124 |
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125 void cm_nxt P_((p_cm_t p_cm, int ch)); |
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126 /* Processes a single message byte [0,255]. */ |
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127 |
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128 void cm_blk P_((p_cm_t p_cm, p_ubyte_ blk_adr, ulong blk_len)); |
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129 /* Processes a block of message bytes. */ |
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130 |
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131 ulong cm_crc P_((p_cm_t p_cm)); |
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132 /* Returns the CRC value for the message bytes processed so far. */ |
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133 |
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134 /******************************************************************************/ |
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135 |
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136 /* Functions For Table Calculation */ |
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137 /* ------------------------------- */ |
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138 /* The following function can be used to calculate a CRC lookup table. */ |
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139 /* It can also be used at run-time to create or check static tables. */ |
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140 |
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141 ulong cm_tab P_((p_cm_t p_cm, int index)); |
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142 /* Returns the i'th entry for the lookup table for the specified algorithm. */ |
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143 /* The function examines the fields cm_width, cm_poly, cm_refin, and the */ |
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144 /* argument table index in the range [0,255] and returns the table entry in */ |
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145 /* the bottom cm_width bytes of the return value. */ |
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146 |
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147 /******************************************************************************/ |
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148 |
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149 /* End of the header file idempotence #ifndef */ |
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150 #endif |