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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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| 404 | cascade | 96 | * clear display memory |
| 97 | * (also sets 8bit mode) |
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| 331 | cascade | 98 | */ |
| 99 | void clear(void) { |
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| 404 | cascade | 100 | /*uint16_t memory_address = 0; |
| 331 | cascade | 101 | for (unsigned int a = 0; a < 480; a++) { |
| 102 | write_char(memory_address++, 0); |
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| 404 | cascade | 103 | }*/ |
| 104 | // clear all display-mem (DMM) |
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| 105 | spi_send_byte(0x04, 0b01000100); |
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| 106 | |||
| 107 | // clearing takes 12uS according to maxim so lets wait longer |
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| 108 | _delay_us(20); |
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| 331 | cascade | 109 | } |
| 110 | |||
| 111 | /** |
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| 112 | * write an ascii <character> to <address> of MAX7456 display memory |
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| 113 | */ |
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| 114 | void write_ascii_char(uint16_t address, char c) { |
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| 115 | if (c == 32) c = 0; // remap space |
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| 116 | else if (c > 48 && c <= 57) c -= 48; // remap numbers |
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| 117 | else if (c == '0') c = 10; // remap zero |
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| 118 | else if (c >= 65 && c <= 90) c -= 54; // remap big letters |
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| 119 | else if (c >= 97 && c <= 122) c -= 60; // remap small letters |
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| 120 | else if (c == '(') c = 63; // remap |
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| 121 | else if (c == ')') c = 64; // remap |
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| 122 | else if (c == '.') c = 65; // remap |
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| 123 | else if (c == '?') c = 66; // remap |
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| 124 | else if (c == ';') c = 67; // remap |
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| 125 | else if (c == ':') c = 68; // remap |
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| 126 | else if (c == ',') c = 69; // remap |
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| 127 | else if (c == '\'') c = 70; // remap |
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| 128 | else if (c == '/') c = 71; // remap |
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| 129 | else if (c == '"') c = 72; // remap |
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| 130 | else if (c == '-') c = 73; // remap minus |
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| 131 | else if (c == '<') c = 74; // remap |
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| 132 | else if (c == '>') c = 75; // remap |
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| 133 | else if (c == '@') c = 76; // remap |
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| 134 | write_char(address, c); |
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| 135 | } |
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| 136 | |||
| 137 | /** |
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| 138 | * write an ascii <string> at <x>/<y> to MAX7456 display memory |
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| 139 | */ |
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| 140 | void write_ascii_string(uint8_t x, uint8_t y, char *string) { |
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| 141 | while (*string) { |
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| 142 | write_ascii_char(((x++)+(y * 30)), *string); |
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| 143 | string++; |
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| 144 | } |
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| 145 | } |
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| 146 | |||
| 147 | /** |
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| 346 | cascade | 148 | * write an ascii <string> from progmen at <x>/<y> to MAX7456 display memory |
| 149 | */ |
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| 150 | void write_ascii_string_pgm(uint8_t x, uint8_t y, char *string) { |
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| 151 | while (pgm_read_byte(string) != 0x00) |
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| 152 | write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++)); |
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| 153 | } |
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| 154 | |||
| 155 | /** |
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| 379 | cascade | 156 | * write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory |
| 157 | */ |
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| 158 | void write_string_pgm_down(uint8_t x, uint8_t y, char *string, uint8_t length) { |
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| 159 | while (length--) |
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| 160 | write_char((x+(y++ * 30)), pgm_read_byte(string++)); |
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| 161 | } |
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| 162 | |||
| 163 | /** |
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| 349 | cascade | 164 | * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory |
| 165 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 166 | * the first digit, so num = 10 will be 0-99 and so on |
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| 167 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 168 | */ |
| 349 | cascade | 169 | void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) { |
| 170 | // if number is largar than 99[..]9 we must decrease it |
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| 171 | while (number >= (num * 10)) { |
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| 172 | number -= num * 10; |
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| 173 | } |
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| 331 | cascade | 174 | |
| 349 | cascade | 175 | uint8_t started = 0; |
| 331 | cascade | 176 | |
| 349 | cascade | 177 | while (num > 0) { |
| 178 | uint8_t b = number / num; |
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| 179 | if (b > 0 || started || num == 1) { |
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| 180 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 181 | started = 1; |
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| 182 | } else { |
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| 183 | if (pad) write_ascii_char((x++)+(y * 30), '0'); |
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| 184 | else write_ascii_char((x++)+(y * 30), 0); |
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| 185 | } |
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| 186 | number -= b * num; |
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| 187 | |||
| 188 | num /= 10; |
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| 189 | } |
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| 331 | cascade | 190 | } |
| 191 | |||
| 192 | /** |
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| 349 | cascade | 193 | * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory |
| 194 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 195 | * the first digit, so num = 10 will be 0-99 and so on |
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| 196 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 197 | */ |
| 349 | cascade | 198 | void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) { |
| 199 | if (((uint16_t) number) > 32767) { |
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| 200 | number = number - 65536; |
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| 201 | num *= -1; |
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| 331 | cascade | 202 | |
| 349 | cascade | 203 | // if number is smaller than -99[..]9 we must increase it |
| 204 | while (number <= (num * 10)) { |
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| 205 | number -= num * 10; |
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| 206 | } |
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| 331 | cascade | 207 | |
| 349 | cascade | 208 | uint8_t started = 0; |
| 331 | cascade | 209 | |
| 349 | cascade | 210 | while (num < 0) { |
| 211 | uint8_t b = number / num; |
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| 212 | if (pad) write_ascii_char((x)+(y * 30), '0'); |
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| 213 | if (b > 0 || started || num == 1) { |
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| 214 | if (!started) write_char((x - 1)+(y * 30), 0x49); |
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| 215 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 216 | started = 1; |
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| 217 | } else { |
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| 218 | write_ascii_char((x++)+(y * 30), 0); |
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| 219 | } |
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| 220 | number -= b * num; |
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| 331 | cascade | 221 | |
| 349 | cascade | 222 | num /= 10; |
| 223 | } |
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| 224 | } else { |
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| 225 | write_char((x)+(y * 30), 0); |
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| 226 | write_ndigit_number_u(x, y, number, num, pad); |
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| 331 | cascade | 227 | } |
| 228 | } |
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| 229 | |||
| 230 | /** |
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| 349 | cascade | 231 | * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory |
| 232 | * as /10th of the value |
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| 233 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 234 | * the first digit, so num = 10 will be 0-99 and so on |
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| 235 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 236 | */ |
| 349 | cascade | 237 | void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) { |
| 238 | // if number is largar than 99[..]9 we must decrease it |
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| 239 | while (number >= (num * 10)) { |
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| 240 | number -= num * 10; |
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| 241 | } |
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| 242 | |||
| 331 | cascade | 243 | |
| 349 | cascade | 244 | uint8_t started = 0; |
| 245 | while (num > 0) { |
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| 246 | uint8_t b = number / num; |
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| 247 | if (b > 0 || started || num == 1) { |
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| 248 | if ((num / 10) == 0) { |
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| 249 | if (!started) write_ascii_char((x - 1)+(y * 30), '0'); |
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| 250 | write_char((x++)+(y * 30), 65); // decimal point |
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| 251 | } |
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| 252 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 253 | started = 1; |
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| 254 | } else { |
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| 255 | if (pad) write_ascii_char((x++)+(y * 30), '0'); |
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| 256 | else write_ascii_char((x++)+(y * 30), ' '); |
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| 257 | } |
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| 258 | number -= b * num; |
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| 331 | cascade | 259 | |
| 349 | cascade | 260 | num /= 10; |
| 261 | } |
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| 331 | cascade | 262 | } |
| 263 | |||
| 264 | /** |
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| 349 | cascade | 265 | * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory |
| 266 | * as /10th of the value |
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| 267 | * <num> represents the largest multiple of 10 that will still be displayable as |
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| 268 | * the first digit, so num = 10 will be 0-99 and so on |
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| 269 | * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of 7 |
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| 331 | cascade | 270 | */ |
| 349 | cascade | 271 | void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) { |
| 272 | if (((uint16_t) number) > 32767) { |
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| 273 | number = number - 65536; |
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| 274 | num *= -1; |
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| 331 | cascade | 275 | |
| 349 | cascade | 276 | // if number is smaller than -99[..]9 we must increase it |
| 277 | while (number <= (num * 10)) { |
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| 278 | number -= num * 10; |
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| 279 | } |
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| 331 | cascade | 280 | |
| 349 | cascade | 281 | uint8_t started = 0; |
| 331 | cascade | 282 | |
| 349 | cascade | 283 | while (num < 0) { |
| 284 | uint8_t b = number / num; |
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| 285 | if (pad) write_ascii_char((x)+(y * 30), '0'); |
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| 286 | if (b > 0 || started || num == 1) { |
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| 287 | if ((num / 10) == 0) { |
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| 288 | if (!started) { |
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| 289 | write_ascii_char((x - 2)+(y * 30), '-'); |
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| 290 | write_ascii_char((x - 1)+(y * 30), '0'); |
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| 291 | } |
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| 292 | write_char((x++)+(y * 30), 65); // decimal point |
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| 293 | } else if (!started) { |
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| 294 | write_char((x - 1)+(y * 30), 0x49); // minus |
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| 295 | } |
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| 296 | write_ascii_char((x++)+(y * 30), '0' + b); |
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| 297 | started = 1; |
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| 298 | } else { |
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| 299 | write_ascii_char((x++)+(y * 30), 0); |
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| 300 | } |
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| 301 | number -= b * num; |
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| 302 | |||
| 303 | num /= 10; |
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| 304 | } |
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| 305 | } else { |
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| 331 | cascade | 306 | write_char((x)+(y * 30), 0); |
| 349 | cascade | 307 | write_ndigit_number_u_10th(x, y, number, num, pad); |
| 331 | cascade | 308 | } |
| 309 | } |
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| 310 | |||
| 311 | /** |
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| 312 | * write <seconds> as human readable time at <x>/<y> to MAX7456 display mem |
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| 313 | */ |
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| 314 | void write_time(uint8_t x, uint8_t y, uint16_t seconds) { |
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| 315 | uint16_t min = seconds / 60; |
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| 316 | seconds -= min * 60; |
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| 349 | cascade | 317 | write_ndigit_number_u(x, y, min, 100, 0); |
| 331 | cascade | 318 | write_char_xy(x + 3, y, 68); |
| 349 | cascade | 319 | write_ndigit_number_u(x + 4, y, seconds, 10, 1); |
| 331 | cascade | 320 | } |
| 321 | |||
| 322 | /** |
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| 323 | * for testing write all chars to screen |
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| 324 | */ |
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| 325 | void write_all_chars() { |
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| 326 | uint16_t x = 3, y = 2, t = 0; |
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| 327 | while (t < 256) { |
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| 328 | write_char_xy(x++, y, t++); |
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| 329 | if (x > 25) { |
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| 330 | y++; |
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| 331 | x = 3; |
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| 332 | } |
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| 333 | } |
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| 334 | } |
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| 335 | |||
| 336 | /** |
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| 337 | * let the MAX7456 learn a new character at <number> |
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| 338 | * with <data>. |
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| 339 | */ |
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| 340 | void learn_char(uint8_t number, unsigned char* data) { |
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| 341 | // select character to write (CMAH) |
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| 342 | spi_send_byte(0x09, number); |
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| 343 | |||
| 344 | for (uint8_t i = 0; i < 54; i++) { |
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| 345 | // select 4pixel byte of char (CMAL) |
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| 346 | spi_send_byte(0x0A, i); |
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| 347 | |||
| 348 | // write 4pixel byte of char (CMDI) |
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| 349 | spi_send_byte(0x0B, data[i]); |
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| 350 | } |
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| 351 | |||
| 352 | // write to the NVM array from the shadow RAM (CMM) |
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| 353 | spi_send_byte(0x08, 0b10100000); |
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| 354 | |||
| 355 | // according to maxim writing to nvram takes about 12ms, lets wait longer |
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| 356 | _delay_ms(120); |
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| 357 | } |