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