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