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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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403 | cascade | 96 | * clear display by writing blank characters all over it |
331 | cascade | 97 | */ |
98 | void clear(void) { |
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403 | cascade | 99 | uint16_t memory_address = 0; |
331 | cascade | 100 | for (unsigned int a = 0; a < 480; a++) { |
101 | write_char(memory_address++, 0); |
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403 | cascade | 102 | } |
331 | cascade | 103 | } |
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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379 | cascade | 150 | * write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory |
151 | */ |
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152 | void write_string_pgm_down(uint8_t x, uint8_t y, char *string, uint8_t length) { |
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153 | while (length--) |
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154 | write_char((x+(y++ * 30)), pgm_read_byte(string++)); |
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155 | } |
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156 | |||
157 | /** |
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349 | cascade | 158 | * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory |
159 | * <num> represents the largest multiple of 10 that will still be displayable as |
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160 | * the first digit, so num = 10 will be 0-99 and so on |
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161 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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331 | cascade | 162 | */ |
349 | cascade | 163 | void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) { |
164 | // if number is largar than 99[..]9 we must decrease it |
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165 | while (number >= (num * 10)) { |
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166 | number -= num * 10; |
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167 | } |
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331 | cascade | 168 | |
349 | cascade | 169 | uint8_t started = 0; |
331 | cascade | 170 | |
349 | cascade | 171 | while (num > 0) { |
172 | uint8_t b = number / num; |
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173 | if (b > 0 || started || num == 1) { |
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174 | write_ascii_char((x++)+(y * 30), '0' + b); |
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175 | started = 1; |
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176 | } else { |
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177 | if (pad) write_ascii_char((x++)+(y * 30), '0'); |
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178 | else write_ascii_char((x++)+(y * 30), 0); |
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179 | } |
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180 | number -= b * num; |
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181 | |||
182 | num /= 10; |
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183 | } |
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331 | cascade | 184 | } |
185 | |||
186 | /** |
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349 | cascade | 187 | * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory |
188 | * <num> represents the largest multiple of 10 that will still be displayable as |
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189 | * the first digit, so num = 10 will be 0-99 and so on |
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190 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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331 | cascade | 191 | */ |
349 | cascade | 192 | void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) { |
193 | if (((uint16_t) number) > 32767) { |
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194 | number = number - 65536; |
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195 | num *= -1; |
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331 | cascade | 196 | |
349 | cascade | 197 | // if number is smaller than -99[..]9 we must increase it |
198 | while (number <= (num * 10)) { |
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199 | number -= num * 10; |
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200 | } |
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331 | cascade | 201 | |
349 | cascade | 202 | uint8_t started = 0; |
331 | cascade | 203 | |
349 | cascade | 204 | while (num < 0) { |
205 | uint8_t b = number / num; |
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206 | if (pad) write_ascii_char((x)+(y * 30), '0'); |
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207 | if (b > 0 || started || num == 1) { |
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208 | if (!started) write_char((x - 1)+(y * 30), 0x49); |
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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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331 | cascade | 215 | |
349 | cascade | 216 | num /= 10; |
217 | } |
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218 | } else { |
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219 | write_char((x)+(y * 30), 0); |
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220 | write_ndigit_number_u(x, y, number, num, pad); |
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331 | cascade | 221 | } |
222 | } |
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223 | |||
224 | /** |
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349 | cascade | 225 | * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory |
226 | * as /10th of the value |
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227 | * <num> represents the largest multiple of 10 that will still be displayable as |
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228 | * the first digit, so num = 10 will be 0-99 and so on |
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229 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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331 | cascade | 230 | */ |
349 | cascade | 231 | void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) { |
232 | // if number is largar than 99[..]9 we must decrease it |
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233 | while (number >= (num * 10)) { |
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234 | number -= num * 10; |
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235 | } |
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236 | |||
331 | cascade | 237 | |
349 | cascade | 238 | uint8_t started = 0; |
239 | while (num > 0) { |
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240 | uint8_t b = number / num; |
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241 | if (b > 0 || started || num == 1) { |
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242 | if ((num / 10) == 0) { |
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243 | if (!started) write_ascii_char((x - 1)+(y * 30), '0'); |
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244 | write_char((x++)+(y * 30), 65); // decimal point |
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245 | } |
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246 | write_ascii_char((x++)+(y * 30), '0' + b); |
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247 | started = 1; |
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248 | } else { |
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249 | if (pad) write_ascii_char((x++)+(y * 30), '0'); |
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250 | else write_ascii_char((x++)+(y * 30), ' '); |
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251 | } |
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252 | number -= b * num; |
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331 | cascade | 253 | |
349 | cascade | 254 | num /= 10; |
255 | } |
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331 | cascade | 256 | } |
257 | |||
258 | /** |
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349 | cascade | 259 | * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory |
260 | * as /10th of the value |
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261 | * <num> represents the largest multiple of 10 that will still be displayable as |
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262 | * the first digit, so num = 10 will be 0-99 and so on |
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263 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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331 | cascade | 264 | */ |
349 | cascade | 265 | void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) { |
266 | if (((uint16_t) number) > 32767) { |
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267 | number = number - 65536; |
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268 | num *= -1; |
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331 | cascade | 269 | |
349 | cascade | 270 | // if number is smaller than -99[..]9 we must increase it |
271 | while (number <= (num * 10)) { |
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272 | number -= num * 10; |
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273 | } |
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331 | cascade | 274 | |
349 | cascade | 275 | uint8_t started = 0; |
331 | cascade | 276 | |
349 | cascade | 277 | while (num < 0) { |
278 | uint8_t b = number / num; |
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279 | if (pad) write_ascii_char((x)+(y * 30), '0'); |
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280 | if (b > 0 || started || num == 1) { |
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281 | if ((num / 10) == 0) { |
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282 | if (!started) { |
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283 | write_ascii_char((x - 2)+(y * 30), '-'); |
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284 | write_ascii_char((x - 1)+(y * 30), '0'); |
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285 | } |
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286 | write_char((x++)+(y * 30), 65); // decimal point |
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287 | } else if (!started) { |
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288 | write_char((x - 1)+(y * 30), 0x49); // minus |
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289 | } |
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290 | write_ascii_char((x++)+(y * 30), '0' + b); |
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291 | started = 1; |
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292 | } else { |
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293 | write_ascii_char((x++)+(y * 30), 0); |
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294 | } |
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295 | number -= b * num; |
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296 | |||
297 | num /= 10; |
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298 | } |
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299 | } else { |
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331 | cascade | 300 | write_char((x)+(y * 30), 0); |
349 | cascade | 301 | write_ndigit_number_u_10th(x, y, number, num, pad); |
331 | cascade | 302 | } |
303 | } |
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304 | |||
305 | /** |
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306 | * write <seconds> as human readable time at <x>/<y> to MAX7456 display mem |
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307 | */ |
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308 | void write_time(uint8_t x, uint8_t y, uint16_t seconds) { |
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309 | uint16_t min = seconds / 60; |
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310 | seconds -= min * 60; |
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349 | cascade | 311 | write_ndigit_number_u(x, y, min, 100, 0); |
331 | cascade | 312 | write_char_xy(x + 3, y, 68); |
349 | cascade | 313 | write_ndigit_number_u(x + 4, y, seconds, 10, 1); |
331 | cascade | 314 | } |
315 | |||
316 | /** |
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317 | * for testing write all chars to screen |
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318 | */ |
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319 | void write_all_chars() { |
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320 | uint16_t x = 3, y = 2, t = 0; |
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321 | while (t < 256) { |
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322 | write_char_xy(x++, y, t++); |
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323 | if (x > 25) { |
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324 | y++; |
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325 | x = 3; |
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326 | } |
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327 | } |
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328 | } |
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329 | |||
330 | /** |
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331 | * let the MAX7456 learn a new character at <number> |
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332 | * with <data>. |
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333 | */ |
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334 | void learn_char(uint8_t number, unsigned char* data) { |
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335 | // select character to write (CMAH) |
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336 | spi_send_byte(0x09, number); |
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337 | |||
338 | for (uint8_t i = 0; i < 54; i++) { |
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339 | // select 4pixel byte of char (CMAL) |
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340 | spi_send_byte(0x0A, i); |
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341 | |||
342 | // write 4pixel byte of char (CMDI) |
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343 | spi_send_byte(0x0B, data[i]); |
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344 | } |
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345 | |||
346 | // write to the NVM array from the shadow RAM (CMM) |
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347 | spi_send_byte(0x08, 0b10100000); |
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348 | |||
349 | // according to maxim writing to nvram takes about 12ms, lets wait longer |
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350 | _delay_ms(120); |
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351 | } |