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331 | cascade | 1 | /**************************************************************************** |
2 | * Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje * |
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3 | * admiralcascade@gmail.com * |
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4 | * Project-URL: http://www.mylifesucks.de/oss/c-osd/ * |
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5 | * * |
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6 | * This program is free software; you can redistribute it and/or modify * |
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7 | * it under the terms of the GNU General Public License as published by * |
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8 | * the Free Software Foundation; either version 2 of the License. * |
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9 | * * |
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10 | * This program is distributed in the hope that it will be useful, * |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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13 | * GNU General Public License for more details. * |
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14 | * * |
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15 | * You should have received a copy of the GNU General Public License * |
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16 | * along with this program; if not, write to the * |
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17 | * Free Software Foundation, Inc., * |
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18 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
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19 | ****************************************************************************/ |
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20 | |||
346 | cascade | 21 | #include <avr/io.h> |
22 | #include <util/delay.h> |
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23 | #include <avr/pgmspace.h> |
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331 | cascade | 24 | #include "max7456_software_spi.h" |
25 | |||
26 | /* ########################################################################## |
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27 | * MAX7456 SPI & Display stuff |
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28 | * ##########################################################################*/ |
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29 | |||
30 | /** |
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31 | * Send a byte through SPI |
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32 | */ |
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33 | void spi_send(uint8_t byte) { |
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34 | for (int8_t i = 7; i >= 0; i--) { |
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35 | if (((byte >> i) & 1)) { |
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36 | MAX_SDIN_HIGH |
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37 | } else { |
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38 | MAX_SDIN_LOW |
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39 | } |
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40 | MAX_SCLK_HIGH |
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41 | MAX_SCLK_LOW |
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42 | } |
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43 | } |
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44 | |||
45 | /** |
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46 | * Send <byte> to <address> of MAX7456 |
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47 | */ |
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48 | void spi_send_byte(uint8_t address, uint8_t byte) { |
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49 | // start sending |
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50 | MAX_CS_LOW |
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51 | |||
52 | spi_send(address); |
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53 | spi_send(byte); |
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54 | |||
55 | // end sending |
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56 | MAX_CS_HIGH |
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57 | } |
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58 | |||
59 | /** |
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60 | * write a <character> to <address> of MAX7456 display memory |
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61 | */ |
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62 | void write_char(uint16_t address, char character) { |
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63 | spi_send_byte(0x05, (address & 0xFF00) >> 8); // DMAH |
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64 | spi_send_byte(0x06, (address & 0x00FF)); // DMAL |
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65 | spi_send_byte(0x07, character); // DMDI |
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66 | } |
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67 | |||
68 | /** |
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69 | * write a character <attribute> to <address> of MAX7456 display memory |
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70 | */ |
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71 | void write_char_att(uint16_t address, char attribute) { |
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72 | // the only important part is that the DMAH[1] is set |
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73 | // so we add 2 which binary is the 2nd lowest byte |
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74 | spi_send_byte(0x05, ((address & 0xFF00) >> 8) | 2); // DMAH |
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75 | spi_send_byte(0x06, (address & 0x00FF)); // DMAL |
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76 | spi_send_byte(0x07, attribute); // DMDI |
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77 | } |
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78 | |||
79 | /** |
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80 | * write a <character> at <x>/<y> to MAX7456 display memory |
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81 | */ |
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82 | void write_char_xy(uint8_t x, uint8_t y, char character) { |
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83 | uint16_t address = y * 30 + x; |
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84 | write_char(address, character); |
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85 | } |
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86 | |||
87 | /** |
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88 | * write a character <attribute> at <x>/<y> to MAX7456 display memory |
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89 | */ |
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90 | void write_char_att_xy(uint8_t x, uint8_t y, char attribute) { |
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91 | uint16_t address = y * 30 + x; |
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92 | write_char_att(address, attribute); |
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93 | } |
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94 | |||
95 | /** |
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96 | * clear display by writing blank characters all over it |
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97 | */ |
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98 | void clear(void) { |
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99 | uint16_t memory_address = 0; |
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100 | for (unsigned int a = 0; a < 480; a++) { |
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101 | write_char(memory_address++, 0); |
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102 | } |
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103 | } |
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104 | |||
105 | /** |
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106 | * write an ascii <character> to <address> of MAX7456 display memory |
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107 | */ |
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108 | void write_ascii_char(uint16_t address, char c) { |
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109 | if (c == 32) c = 0; // remap space |
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110 | else if (c > 48 && c <= 57) c -= 48; // remap numbers |
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111 | else if (c == '0') c = 10; // remap zero |
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112 | else if (c >= 65 && c <= 90) c -= 54; // remap big letters |
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113 | else if (c >= 97 && c <= 122) c -= 60; // remap small letters |
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114 | else if (c == '(') c = 63; // remap |
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115 | else if (c == ')') c = 64; // remap |
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116 | else if (c == '.') c = 65; // remap |
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117 | else if (c == '?') c = 66; // remap |
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118 | else if (c == ';') c = 67; // remap |
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119 | else if (c == ':') c = 68; // remap |
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120 | else if (c == ',') c = 69; // remap |
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121 | else if (c == '\'') c = 70; // remap |
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122 | else if (c == '/') c = 71; // remap |
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123 | else if (c == '"') c = 72; // remap |
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124 | else if (c == '-') c = 73; // remap minus |
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125 | else if (c == '<') c = 74; // remap |
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126 | else if (c == '>') c = 75; // remap |
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127 | else if (c == '@') c = 76; // remap |
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128 | write_char(address, c); |
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129 | } |
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130 | |||
131 | /** |
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132 | * write an ascii <string> at <x>/<y> to MAX7456 display memory |
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133 | */ |
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134 | void write_ascii_string(uint8_t x, uint8_t y, char *string) { |
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135 | while (*string) { |
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136 | write_ascii_char(((x++)+(y * 30)), *string); |
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137 | string++; |
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138 | } |
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139 | } |
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140 | |||
141 | /** |
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346 | cascade | 142 | * write an ascii <string> from progmen at <x>/<y> to MAX7456 display memory |
143 | */ |
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144 | void write_ascii_string_pgm(uint8_t x, uint8_t y, char *string) { |
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145 | while (pgm_read_byte(string) != 0x00) |
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146 | write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++)); |
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147 | } |
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148 | |||
149 | /** |
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331 | cascade | 150 | * Write only the last three digits of a <number> at <x>/<y> to MAX7456 |
151 | * display memory. takes full 16bit numbers as well for stuff |
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152 | * like compass only taking three characters (values <= 999) |
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153 | */ |
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154 | void write_3digit_number_u(uint8_t x, uint8_t y, uint16_t number) { |
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155 | uint16_t num = 100; |
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156 | uint8_t started = 0; |
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157 | |||
158 | while (num > 0) { |
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159 | uint8_t b = number / num; |
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160 | if (b > 0 || started || num == 1) { |
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161 | write_ascii_char((x++)+(y * 30), '0' + b); |
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162 | started = 1; |
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163 | } else { |
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164 | write_ascii_char((x++)+(y * 30), 0); |
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165 | } |
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166 | number -= b * num; |
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167 | |||
168 | num /= 10; |
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169 | } |
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170 | } |
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171 | |||
172 | /** |
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173 | * Write only the last two digits of a number at <x>/<y> to MAX7456 |
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174 | * display memory. takes full 16bit numbers as well for stuff |
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175 | * like seconds only taking two characters (values <= 99) |
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176 | * Since this is used for seconds only and it looks better, there |
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177 | * is a trading 0 attached |
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178 | */ |
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179 | void write_2digit_number_u(uint8_t x, uint8_t y, uint16_t number) { |
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180 | uint16_t num = 10; |
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181 | uint8_t started = 0; |
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182 | |||
183 | while (num > 0) { |
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184 | uint8_t b = number / num; |
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185 | if (b > 0 || started || num == 1) { |
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186 | write_ascii_char((x++)+(y * 30), '0' + b); |
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187 | started = 1; |
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188 | } else { |
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189 | write_ascii_char((x++)+(y * 30), '0'); |
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190 | } |
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191 | number -= b * num; |
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192 | |||
193 | num /= 10; |
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194 | } |
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195 | } |
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196 | |||
197 | /** |
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198 | * write a unsigned number as /10th at <x>/<y> to MAX7456 display memory |
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199 | */ |
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200 | void write_number_u_10th(uint8_t x, uint8_t y, uint16_t number) { |
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201 | uint16_t num = 10000; |
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202 | uint8_t started = 0; |
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203 | |||
204 | while (num > 0) { |
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205 | uint8_t b = number / num; |
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206 | |||
207 | if (b > 0 || started || num == 1) { |
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208 | if ((num / 10) == 0) write_char((x++)+(y * 30), 65); |
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209 | write_ascii_char((x++)+(y * 30), '0' + b); |
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210 | started = 1; |
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211 | } else { |
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212 | write_ascii_char((x++)+(y * 30), 0); |
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213 | } |
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214 | number -= b * num; |
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215 | |||
216 | num /= 10; |
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217 | } |
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218 | } |
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219 | |||
220 | /** |
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221 | * write a unsigned number at <x>/<y> to MAX7456 display memory |
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222 | */ |
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223 | void write_number_u(uint8_t x, uint8_t y, uint16_t number) { |
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224 | uint16_t num = 10000; |
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225 | uint8_t started = 0; |
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226 | |||
227 | while (num > 0) { |
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228 | uint8_t b = number / num; |
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229 | if (b > 0 || started || num == 1) { |
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230 | write_ascii_char((x++)+(y * 30), '0' + b); |
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231 | started = 1; |
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232 | } else { |
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233 | write_ascii_char((x++)+(y * 30), 0); |
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234 | } |
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235 | number -= b * num; |
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236 | |||
237 | num /= 10; |
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238 | } |
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239 | } |
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240 | |||
241 | /** |
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242 | * write a signed number at <x>/<y> to MAX7456 display memory |
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243 | */ |
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244 | void write_number_s(uint8_t x, uint8_t y, int16_t w) { |
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245 | if (((uint16_t) w) > 32767) { |
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246 | w = w - 65536; |
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247 | |||
248 | int16_t num = -10000; |
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249 | uint8_t started = 0; |
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250 | |||
251 | while (num < 0) { |
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252 | uint8_t b = w / num; |
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253 | if (b > 0 || started || num == 1) { |
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254 | if (!started) write_char((x - 1)+(y * 30), 0x49); |
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255 | write_ascii_char((x++)+(y * 30), '0' + b); |
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256 | started = 1; |
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257 | } else { |
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258 | write_ascii_char((x++)+(y * 30), 0); |
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259 | } |
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260 | w -= b * num; |
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261 | |||
262 | num /= 10; |
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263 | } |
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264 | } else { |
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265 | write_char((x)+(y * 30), 0); |
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266 | write_number_u(x, y, w); |
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267 | } |
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268 | } |
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269 | |||
270 | /** |
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271 | * write <seconds> as human readable time at <x>/<y> to MAX7456 display mem |
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272 | */ |
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273 | void write_time(uint8_t x, uint8_t y, uint16_t seconds) { |
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274 | uint16_t min = seconds / 60; |
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275 | seconds -= min * 60; |
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276 | write_3digit_number_u(x, y, min); |
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277 | write_char_xy(x + 3, y, 68); |
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278 | write_2digit_number_u(x + 4, y, seconds); |
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279 | } |
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280 | |||
281 | /** |
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282 | * for testing write all chars to screen |
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283 | */ |
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284 | void write_all_chars() { |
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285 | uint16_t x = 3, y = 2, t = 0; |
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286 | while (t < 256) { |
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287 | write_char_xy(x++, y, t++); |
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288 | if (x > 25) { |
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289 | y++; |
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290 | x = 3; |
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291 | } |
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292 | } |
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293 | } |
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294 | |||
295 | /** |
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296 | * let the MAX7456 learn a new character at <number> |
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297 | * with <data>. |
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298 | */ |
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299 | void learn_char(uint8_t number, unsigned char* data) { |
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300 | // select character to write (CMAH) |
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301 | spi_send_byte(0x09, number); |
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302 | |||
303 | for (uint8_t i = 0; i < 54; i++) { |
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304 | // select 4pixel byte of char (CMAL) |
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305 | spi_send_byte(0x0A, i); |
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306 | |||
307 | // write 4pixel byte of char (CMDI) |
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308 | spi_send_byte(0x0B, data[i]); |
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309 | } |
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310 | |||
311 | // write to the NVM array from the shadow RAM (CMM) |
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312 | spi_send_byte(0x08, 0b10100000); |
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313 | |||
314 | // according to maxim writing to nvram takes about 12ms, lets wait longer |
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315 | _delay_ms(120); |
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316 | } |