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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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| 349 | cascade | 150 | * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory |
| 151 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 152 | * the first digit, so num = 10 will be 0-99 and so on |
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| 153 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 154 | */ |
| 349 | cascade | 155 | void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) { |
| 156 | // if number is largar than 99[..]9 we must decrease it |
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| 157 | while (number >= (num * 10)) { |
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| 158 | number -= num * 10; |
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| 159 | } |
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| 331 | cascade | 160 | |
| 349 | cascade | 161 | uint8_t started = 0; |
| 331 | cascade | 162 | |
| 349 | cascade | 163 | while (num > 0) { |
| 164 | uint8_t b = number / num; |
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| 165 | if (b > 0 || started || num == 1) { |
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| 166 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 167 | started = 1; |
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| 168 | } else { |
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| 169 | if (pad) write_ascii_char((x++)+(y * 30), '0'); |
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| 170 | else write_ascii_char((x++)+(y * 30), 0); |
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| 171 | } |
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| 172 | number -= b * num; |
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| 173 | |||
| 174 | num /= 10; |
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| 175 | } |
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| 331 | cascade | 176 | } |
| 177 | |||
| 178 | /** |
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| 349 | cascade | 179 | * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory |
| 180 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 181 | * the first digit, so num = 10 will be 0-99 and so on |
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| 182 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 183 | */ |
| 349 | cascade | 184 | void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) { |
| 185 | if (((uint16_t) number) > 32767) { |
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| 186 | number = number - 65536; |
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| 187 | num *= -1; |
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| 331 | cascade | 188 | |
| 349 | cascade | 189 | // if number is smaller than -99[..]9 we must increase it |
| 190 | while (number <= (num * 10)) { |
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| 191 | number -= num * 10; |
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| 192 | } |
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| 331 | cascade | 193 | |
| 349 | cascade | 194 | uint8_t started = 0; |
| 331 | cascade | 195 | |
| 349 | cascade | 196 | while (num < 0) { |
| 197 | uint8_t b = number / num; |
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| 198 | if (pad) write_ascii_char((x)+(y * 30), '0'); |
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| 199 | if (b > 0 || started || num == 1) { |
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| 200 | if (!started) write_char((x - 1)+(y * 30), 0x49); |
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| 201 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 202 | started = 1; |
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| 203 | } else { |
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| 204 | write_ascii_char((x++)+(y * 30), 0); |
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| 205 | } |
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| 206 | number -= b * num; |
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| 331 | cascade | 207 | |
| 349 | cascade | 208 | num /= 10; |
| 209 | } |
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| 210 | } else { |
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| 211 | write_char((x)+(y * 30), 0); |
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| 212 | write_ndigit_number_u(x, y, number, num, pad); |
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| 331 | cascade | 213 | } |
| 214 | } |
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| 215 | |||
| 216 | /** |
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| 349 | cascade | 217 | * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory |
| 218 | * as /10th of the value |
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| 219 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 220 | * the first digit, so num = 10 will be 0-99 and so on |
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| 221 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 222 | */ |
| 349 | cascade | 223 | void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) { |
| 224 | // if number is largar than 99[..]9 we must decrease it |
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| 225 | while (number >= (num * 10)) { |
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| 226 | number -= num * 10; |
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| 227 | } |
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| 228 | |||
| 331 | cascade | 229 | |
| 349 | cascade | 230 | uint8_t started = 0; |
| 231 | while (num > 0) { |
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| 232 | uint8_t b = number / num; |
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| 233 | if (b > 0 || started || num == 1) { |
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| 234 | if ((num / 10) == 0) { |
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| 235 | if (!started) write_ascii_char((x - 1)+(y * 30), '0'); |
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| 236 | write_char((x++)+(y * 30), 65); // decimal point |
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| 237 | } |
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| 238 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 239 | started = 1; |
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| 240 | } else { |
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| 241 | if (pad) write_ascii_char((x++)+(y * 30), '0'); |
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| 242 | else write_ascii_char((x++)+(y * 30), ' '); |
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| 243 | } |
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| 244 | number -= b * num; |
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| 331 | cascade | 245 | |
| 349 | cascade | 246 | num /= 10; |
| 247 | } |
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| 331 | cascade | 248 | } |
| 249 | |||
| 250 | /** |
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| 349 | cascade | 251 | * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory |
| 252 | * as /10th of the value |
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| 253 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 254 | * the first digit, so num = 10 will be 0-99 and so on |
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| 255 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 256 | */ |
| 349 | cascade | 257 | void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) { |
| 258 | if (((uint16_t) number) > 32767) { |
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| 259 | number = number - 65536; |
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| 260 | num *= -1; |
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| 331 | cascade | 261 | |
| 349 | cascade | 262 | // if number is smaller than -99[..]9 we must increase it |
| 263 | while (number <= (num * 10)) { |
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| 264 | number -= num * 10; |
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| 265 | } |
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| 331 | cascade | 266 | |
| 349 | cascade | 267 | uint8_t started = 0; |
| 331 | cascade | 268 | |
| 349 | cascade | 269 | while (num < 0) { |
| 270 | uint8_t b = number / num; |
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| 271 | if (pad) write_ascii_char((x)+(y * 30), '0'); |
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| 272 | if (b > 0 || started || num == 1) { |
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| 273 | if ((num / 10) == 0) { |
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| 274 | if (!started) { |
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| 275 | write_ascii_char((x - 2)+(y * 30), '-'); |
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| 276 | write_ascii_char((x - 1)+(y * 30), '0'); |
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| 277 | } |
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| 278 | write_char((x++)+(y * 30), 65); // decimal point |
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| 279 | } else if (!started) { |
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| 280 | write_char((x - 1)+(y * 30), 0x49); // minus |
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| 281 | } |
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| 282 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 283 | started = 1; |
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| 284 | } else { |
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| 285 | write_ascii_char((x++)+(y * 30), 0); |
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| 286 | } |
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| 287 | number -= b * num; |
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| 288 | |||
| 289 | num /= 10; |
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| 290 | } |
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| 291 | } else { |
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| 331 | cascade | 292 | write_char((x)+(y * 30), 0); |
| 349 | cascade | 293 | write_ndigit_number_u_10th(x, y, number, num, pad); |
| 331 | cascade | 294 | } |
| 295 | } |
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| 296 | |||
| 297 | /** |
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| 298 | * write <seconds> as human readable time at <x>/<y> to MAX7456 display mem |
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| 299 | */ |
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| 300 | void write_time(uint8_t x, uint8_t y, uint16_t seconds) { |
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| 301 | uint16_t min = seconds / 60; |
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| 302 | seconds -= min * 60; |
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| 349 | cascade | 303 | write_ndigit_number_u(x, y, min, 100, 0); |
| 331 | cascade | 304 | write_char_xy(x + 3, y, 68); |
| 349 | cascade | 305 | write_ndigit_number_u(x + 4, y, seconds, 10, 1); |
| 331 | cascade | 306 | } |
| 307 | |||
| 308 | /** |
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| 309 | * for testing write all chars to screen |
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| 310 | */ |
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| 311 | void write_all_chars() { |
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| 312 | uint16_t x = 3, y = 2, t = 0; |
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| 313 | while (t < 256) { |
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| 314 | write_char_xy(x++, y, t++); |
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| 315 | if (x > 25) { |
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| 316 | y++; |
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| 317 | x = 3; |
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| 318 | } |
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| 319 | } |
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| 320 | } |
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| 321 | |||
| 322 | /** |
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| 323 | * let the MAX7456 learn a new character at <number> |
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| 324 | * with <data>. |
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| 325 | */ |
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| 326 | void learn_char(uint8_t number, unsigned char* data) { |
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| 327 | // select character to write (CMAH) |
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| 328 | spi_send_byte(0x09, number); |
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| 329 | |||
| 330 | for (uint8_t i = 0; i < 54; i++) { |
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| 331 | // select 4pixel byte of char (CMAL) |
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| 332 | spi_send_byte(0x0A, i); |
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| 333 | |||
| 334 | // write 4pixel byte of char (CMDI) |
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| 335 | spi_send_byte(0x0B, data[i]); |
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| 336 | } |
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| 337 | |||
| 338 | // write to the NVM array from the shadow RAM (CMM) |
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| 339 | spi_send_byte(0x08, 0b10100000); |
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| 340 | |||
| 341 | // according to maxim writing to nvram takes about 12ms, lets wait longer |
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| 342 | _delay_ms(120); |
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| 343 | } |