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331 cascade 1
/****************************************************************************
728 cascade 2
 *   Copyright (C) 2009-2010 by Claas Anders "CaScAdE" Rathje               *
331 cascade 3
 *   admiralcascade@gmail.com                                               *
4
 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
5
 *                                                                          *
6
 *   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      *
16
 *   along with this program; if not, write to the                          *
17
 *   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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#include <avr/io.h>
22
#include <util/delay.h>
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#include <avr/pgmspace.h> 
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#include <string.h>
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#include <stdlib.h>
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#include "main.h"
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#include "max7456_software_spi.h"
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char conv_array[7]; // general array for number -> char conversation
31
 
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/* ##########################################################################
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 * MAX7456 SPI & Display stuff
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 * ##########################################################################*/
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36
/**
37
 * Send a byte through SPI
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 * inline because it increases the codesize currenlty 'only' by 110byte but saves
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 * the context-change on every char and attribute which is at least done twice
40
 * (address and data byte), a significant speed-bost we do not want to miss :)
331 cascade 41
 */
519 cascade 42
inline void spi_send(uint8_t byte) {
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    for (int8_t i = 7; i >= 0; i--) {
44
        if (((byte >> i) & 1)) {
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            MAX_SDIN_HIGH
46
        } else {
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            MAX_SDIN_LOW
48
        }
49
        MAX_SCLK_HIGH
50
        MAX_SCLK_LOW
51
    }
52
}
53
 
54
/**
55
 *  Send <byte> to <address> of MAX7456
56
 */
57
void spi_send_byte(uint8_t address, uint8_t byte) {
58
    // start sending
59
    MAX_CS_LOW
60
 
61
    spi_send(address);
62
    spi_send(byte);
63
 
64
    // end sending
65
    MAX_CS_HIGH
66
}
67
 
68
/**
69
 *  write a <character> to <address> of MAX7456 display memory
70
 */
71
void write_char(uint16_t address, char character) {
72
    spi_send_byte(0x05, (address & 0xFF00) >> 8); // DMAH
73
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
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    spi_send_byte(0x07, character); // DMDI
75
}
76
 
77
/**
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 *  clear display memory
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 *  (also sets 8bit mode)
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 */
81
void clear(void) {
82
    /*uint16_t memory_address = 0;
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    for (unsigned int a = 0; a < 480; a++) {
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        write_char(memory_address++, 0);
85
    }*/
761 - 86
    // clear all display-mem (DMM)
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    spi_send_byte(0x04, 0b01000100);
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89
    // clearing takes 12uS according to maxim so lets wait longer
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    _delay_us(20);
91
}
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93
 
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#if (ALLCHARSDEBUG|(WRITECHARS != -1))
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/**
97
 * for testing write all chars to screen
98
 */
99
void write_all_chars() {
100
    uint16_t x = 3, y = 2, t = 0;
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    while (t < 256) {
761 - 102
        write_char(x++ + y * 30, t++);
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        if (x > 25) {
104
            y++;
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            x = 3;
106
        }
107
    }
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}
109
 
736 cascade 110
/**
111
 * let the MAX7456 learn a new character at <number>
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 * with <data>.
113
 */
114
void learn_char(uint8_t number, unsigned char* data) {
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    // select character to write (CMAH)
116
    spi_send_byte(0x09, number);
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118
    for (uint8_t i = 0; i < 54; i++) {
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        // select 4pixel byte of char (CMAL)
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        spi_send_byte(0x0A, i);
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122
        // write 4pixel byte of char (CMDI)
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        spi_send_byte(0x0B, data[i]);
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    }
125
 
126
    // write to the NVM array from the shadow RAM (CMM)
127
    spi_send_byte(0x08, 0b10100000);
128
 
129
    // according to maxim writing to nvram takes about 12ms, lets wait longer
130
    _delay_ms(120);
131
}
132
#endif
133
 
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#if !(ALLCHARSDEBUG|(WRITECHARS != -1))
135
 
136
/**
331 cascade 137
 *  write a character <attribute> to <address> of MAX7456 display memory
138
 */
139
void write_char_att(uint16_t address, char attribute) {
140
    // the only important part is that the DMAH[1] is set
141
    // so we add 2 which binary is the 2nd lowest byte
142
    spi_send_byte(0x05, ((address & 0xFF00) >> 8) | 2); // DMAH
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    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
144
    spi_send_byte(0x07, attribute); // DMDI
145
}
146
 
147
/**
148
 *  write a <character> at <x>/<y> to MAX7456 display memory
149
 */
150
void write_char_xy(uint8_t x, uint8_t y, char character) {
151
    uint16_t address = y * 30 + x;
152
    write_char(address, character);
153
}
154
 
155
/**
156
 *  write a  character <attribute> at <x>/<y> to MAX7456 display memory
157
 */
158
void write_char_att_xy(uint8_t x, uint8_t y, char attribute) {
159
    uint16_t address = y * 30 + x;
160
    write_char_att(address, attribute);
161
}
162
 
163
/**
164
 *  write an ascii <character> to <address> of MAX7456 display memory
165
 */
166
void write_ascii_char(uint16_t address, char c) {
167
    if (c == 32) c = 0; // remap space
168
    else if (c > 48 && c <= 57) c -= 48; // remap numbers
169
    else if (c == '0') c = 10; // remap zero
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    else if (c >= 65 && c <= 90) c -= 54; // remap big letters
171
    else if (c >= 97 && c <= 122) c -= 60; // remap small letters
172
    else if (c == '(') c = 63; // remap
173
    else if (c == ')') c = 64; // remap
174
    else if (c == '.') c = 65; // remap
736 cascade 175
    else if (c == '-') c = 73; // remap minus
331 cascade 176
    else if (c == ';') c = 67; // remap
177
    else if (c == ':') c = 68; // remap
178
    else if (c == ',') c = 69; // remap
761 - 179
        //    else if (c == '?') c = 66; // remap
180
        //    else if (c == '\'') c = 70; // remap
757 cascade 181
    else if (c == '/') c = 71; // remap
761 - 182
    //    else if (c == '"') c = 72; // remap
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    //    else if (c == '<') c = 74; // remap
184
    //    else if (c == '>') c = 75; // remap
185
    //    else if (c == '@') c = 76; // remap
331 cascade 186
    write_char(address, c);
187
}
188
 
189
/**
190
 *  write an ascii <string> at <x>/<y> to MAX7456 display memory
191
 */
192
void write_ascii_string(uint8_t x, uint8_t y, char *string) {
193
    while (*string) {
194
        write_ascii_char(((x++)+(y * 30)), *string);
195
        string++;
196
    }
197
}
198
 
199
/**
346 cascade 200
 *  write an ascii <string> from progmen at <x>/<y> to MAX7456 display memory
201
 */
489 woggle 202
void write_ascii_string_pgm(uint8_t x, uint8_t y, const char *string) {
761 - 203
    while (pgm_read_byte(string) != 0x00)
204
        write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++));
346 cascade 205
}
206
 
207
/**
379 cascade 208
 *  write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory
209
 */
489 woggle 210
void write_string_pgm_down(uint8_t x, uint8_t y, const char *string, uint8_t length) {
761 - 211
    while (length--)
212
        write_char((x + (y++ * 30)), pgm_read_byte(string++));
379 cascade 213
}
214
 
215
/**
519 cascade 216
 * Write a unsigned <number> at <x>/<y> to MAX7456 display memory
217
 * <length> represents the length to rightbound the number
349 cascade 218
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 219
 */
519 cascade 220
void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t length, uint8_t pad) {
761 - 221
    itoa(number, conv_array, 10);
222
    for (uint8_t i = 0; i < length - strlen(conv_array); i++) {
223
        if (pad) write_char((x++)+(y * 30), 10);
224
        else write_ascii_char((x++)+(y * 30), 0);
225
    }
226
    write_ascii_string(x, y, conv_array);
331 cascade 227
}
228
 
229
/**
519 cascade 230
 * Write a signed <number> at <x>/<y> to MAX7456 display memory
231
 * <length> represents the length to rightbound the number
349 cascade 232
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 233
 */
519 cascade 234
void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t length, uint8_t pad) {
761 - 235
    itoa(number, conv_array, 10);
236
    for (uint8_t i = 0; i < length - strlen(conv_array); i++) {
237
        if (pad) write_char((x++)+(y * 30), 10);
238
        else write_ascii_char((x++)+(y * 30), 0);
239
    }
240
    write_ascii_string(x, y, conv_array);
331 cascade 241
}
242
 
243
/**
519 cascade 244
 * Write a unsigned <number> at <x>/<y> to MAX7456 display memory as /10th of value
245
 * <length> represents the length to rightbound the number
349 cascade 246
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 247
 */
519 cascade 248
void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t length, uint8_t pad) {
761 - 249
    itoa(number, conv_array, 10);
250
    uint8_t len = strlen(conv_array);
251
    for (uint8_t i = 0; i < length - len; i++) {
252
        if (pad) write_char((x++)+(y * 30), 10); //  zero
253
        else write_char((x++)+(y * 30), 0); // blank
254
    }
255
    char rest = conv_array[len - 1];
256
    conv_array[len - 1] = 0;
257
    if (len == 1) {
258
        write_char((x - 1)+(y * 30), 10); // zero
259
    } else if (len == 2 && conv_array[0] == '-') {
260
        write_char((x - 1)+(y * 30), 0x49); // minus
261
        write_char((x)+(y * 30), 10); // zero
262
    } else {
263
        write_ascii_string(x, y, conv_array);
264
    }
265
    x += len - 1;
266
    write_char((x++)+(y * 30), 65); // decimal point
267
    write_ascii_char((x++)+(y * 30), rest); // after dot
331 cascade 268
}
269
 
270
/**
519 cascade 271
 * Write a signed <number> at <x>/<y> to MAX7456 display memory as /10th of value
272
 * <length> represents the length to rightbound the number
349 cascade 273
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 274
 */
519 cascade 275
void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t length, uint8_t pad) {
761 - 276
    itoa(number, conv_array, 10);
277
    uint8_t len = strlen(conv_array);
278
    for (uint8_t i = 0; i < length - len; i++) {
279
        if (pad) write_char((x++)+(y * 30), 10); //  zero
280
        else write_char((x++)+(y * 30), 0); // blank
281
    }
282
    char rest = conv_array[len - 1];
283
    conv_array[len - 1] = 0;
284
    if (len == 1) {
285
        write_char((x - 1)+(y * 30), 10); // zero
286
    } else if (len == 2 && conv_array[0] == '-') {
287
        write_char((x - 1)+(y * 30), 0x49); // minus
288
        write_char((x)+(y * 30), 10); // zero
289
    } else {
290
        write_ascii_string(x, y, conv_array);
291
    }
292
    x += len - 1;
293
    write_char((x++)+(y * 30), 65); // decimal point
294
    write_ascii_char((x++)+(y * 30), rest); // after dot
331 cascade 295
}
296
 
297
/**
298
 *  write <seconds> as human readable time at <x>/<y> to MAX7456 display mem
299
 */
300
void write_time(uint8_t x, uint8_t y, uint16_t seconds) {
301
    uint16_t min = seconds / 60;
302
    seconds -= min * 60;
519 cascade 303
    write_ndigit_number_u(x, y, min, 3, 0);
331 cascade 304
    write_char_xy(x + 3, y, 68);
519 cascade 305
    write_ndigit_number_u(x + 4, y, seconds, 2, 1);
331 cascade 306
}
307
 
308
/**
412 cascade 309
 * wirte a <position> at <x>/<y> assuming it is a gps position for long-/latitude
310
 */
311
void write_gps_pos(uint8_t x, uint8_t y, int32_t position) {
761 - 312
    if (position < 0) {
313
        position ^= ~0;
314
        position++;
315
        write_char_xy(x++, y, 0x49); // minus
316
    } else {
317
        write_char_xy(x++, y, 0); // clear ('+' would be nice, maybe later)
318
    }
319
    write_ndigit_number_u(x, y, (uint16_t)(position / (int32_t)10000000), 3, 1);
320
    write_char_xy(x + 3, y, 65); // decimal point
321
    position = position - ((position / (int32_t)10000000) * (int32_t)10000000);
322
    write_ndigit_number_u(x + 4, y, (uint16_t)(position / (int32_t)1000), 4, 1);
323
    position = position - ((uint16_t)(position / (int32_t)1000) * (int32_t)1000);
324
    write_ndigit_number_u(x + 8, y, (uint16_t)position, 3, 1);
325
    write_char_xy(x + 11, y, 0xD0); // degree symbol
412 cascade 326
}
514 cascade 327
 
328
#endif