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331 cascade 1
/****************************************************************************
2
 *   Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje                    *
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   *
7
 *   it under the terms of the GNU General Public License as published by   *
8
 *   the Free Software Foundation; either version 2 of the License.         *
9
 *                                                                          *
10
 *   This program is distributed in the hope that it will be useful,        *
11
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
12
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
13
 *   GNU General Public License for more details.                           *
14
 *                                                                          *
15
 *   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.,                                        *
18
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
19
 ****************************************************************************/
20
 
346 cascade 21
#include <avr/io.h>
22
#include <util/delay.h>
23
#include <avr/pgmspace.h> 
331 cascade 24
#include "max7456_software_spi.h"
25
 
26
/* ##########################################################################
27
 * MAX7456 SPI & Display stuff
28
 * ##########################################################################*/
29
 
30
/**
31
 * Send a byte through SPI
32
 */
33
void spi_send(uint8_t byte) {
34
    for (int8_t i = 7; i >= 0; i--) {
35
        if (((byte >> i) & 1)) {
36
            MAX_SDIN_HIGH
37
        } else {
38
            MAX_SDIN_LOW
39
        }
40
        MAX_SCLK_HIGH
41
        MAX_SCLK_LOW
42
    }
43
}
44
 
45
/**
46
 *  Send <byte> to <address> of MAX7456
47
 */
48
void spi_send_byte(uint8_t address, uint8_t byte) {
49
    // start sending
50
    MAX_CS_LOW
51
 
52
    spi_send(address);
53
    spi_send(byte);
54
 
55
    // end sending
56
    MAX_CS_HIGH
57
}
58
 
59
/**
60
 *  write a <character> to <address> of MAX7456 display memory
61
 */
62
void write_char(uint16_t address, char character) {
63
    spi_send_byte(0x05, (address & 0xFF00) >> 8); // DMAH
64
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
65
    spi_send_byte(0x07, character); // DMDI
66
}
67
 
68
/**
69
 *  write a character <attribute> to <address> of MAX7456 display memory
70
 */
71
void write_char_att(uint16_t address, char attribute) {
72
    // the only important part is that the DMAH[1] is set
73
    // so we add 2 which binary is the 2nd lowest byte
74
    spi_send_byte(0x05, ((address & 0xFF00) >> 8) | 2); // DMAH
75
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
76
    spi_send_byte(0x07, attribute); // DMDI
77
}
78
 
79
/**
80
 *  write a <character> at <x>/<y> to MAX7456 display memory
81
 */
82
void write_char_xy(uint8_t x, uint8_t y, char character) {
83
    uint16_t address = y * 30 + x;
84
    write_char(address, character);
85
}
86
 
87
/**
88
 *  write a  character <attribute> at <x>/<y> to MAX7456 display memory
89
 */
90
void write_char_att_xy(uint8_t x, uint8_t y, char attribute) {
91
    uint16_t address = y * 30 + x;
92
    write_char_att(address, attribute);
93
}
94
 
95
/**
96
 *  clear display by writing blank characters all over it
97
 */
98
void clear(void) {
99
    uint16_t memory_address = 0;
100
    for (unsigned int a = 0; a < 480; a++) {
101
        write_char(memory_address++, 0);
102
    }
103
}
104
 
105
/**
106
 *  write an ascii <character> to <address> of MAX7456 display memory
107
 */
108
void write_ascii_char(uint16_t address, char c) {
109
    if (c == 32) c = 0; // remap space
110
    else if (c > 48 && c <= 57) c -= 48; // remap numbers
111
    else if (c == '0') c = 10; // remap zero
112
    else if (c >= 65 && c <= 90) c -= 54; // remap big letters
113
    else if (c >= 97 && c <= 122) c -= 60; // remap small letters
114
    else if (c == '(') c = 63; // remap
115
    else if (c == ')') c = 64; // remap
116
    else if (c == '.') c = 65; // remap
117
    else if (c == '?') c = 66; // remap
118
    else if (c == ';') c = 67; // remap
119
    else if (c == ':') c = 68; // remap
120
    else if (c == ',') c = 69; // remap
121
    else if (c == '\'') c = 70; // remap
122
    else if (c == '/') c = 71; // remap
123
    else if (c == '"') c = 72; // remap
124
    else if (c == '-') c = 73; // remap minus
125
    else if (c == '<') c = 74; // remap
126
    else if (c == '>') c = 75; // remap
127
    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);
137
        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)
146
                write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++));
147
}
148
 
149
/**
379 cascade 150
 *  write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory
151
 */
152
void write_string_pgm_down(uint8_t x, uint8_t y, char *string, uint8_t length) {
153
        while (length--)
154
                write_char((x+(y++ * 30)), pgm_read_byte(string++));
155
}
156
 
157
/**
349 cascade 158
 * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
159
 * <num> represents the largest multiple of 10 that will still be displayable as
160
 * the first digit, so num = 10 will be 0-99 and so on
161
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 162
 */
349 cascade 163
void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) {
164
                // if number is largar than 99[..]9 we must decrease it
165
                while (number >= (num * 10)) {
166
                        number -= num * 10;
167
                }
331 cascade 168
 
349 cascade 169
                uint8_t started = 0;
331 cascade 170
 
349 cascade 171
                while (num > 0) {
172
                        uint8_t b = number / num;
173
                        if (b > 0 || started || num == 1) {
174
                            write_ascii_char((x++)+(y * 30), '0' + b);
175
                            started = 1;
176
                        } else {
177
                                if (pad) write_ascii_char((x++)+(y * 30), '0');
178
                                else write_ascii_char((x++)+(y * 30), 0);
179
                        }
180
                        number -= b * num;
181
 
182
                        num /= 10;
183
                }
331 cascade 184
}
185
 
186
/**
349 cascade 187
 * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
188
 * <num> represents the largest multiple of 10 that will still be displayable as
189
 * the first digit, so num = 10 will be 0-99 and so on
190
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 191
 */
349 cascade 192
void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) {
193
    if (((uint16_t) number) > 32767) {
194
        number = number - 65536;
195
                num *= -1;
331 cascade 196
 
349 cascade 197
                // if number is smaller than -99[..]9 we must increase it
198
                while (number <= (num * 10)) {
199
                        number -= num * 10;
200
                }
331 cascade 201
 
349 cascade 202
                uint8_t started = 0;
331 cascade 203
 
349 cascade 204
                while (num < 0) {
205
                        uint8_t b = number / num;
206
                        if (pad) write_ascii_char((x)+(y * 30), '0');
207
                        if (b > 0 || started || num == 1) {
208
                                if (!started) write_char((x - 1)+(y * 30), 0x49);
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;
331 cascade 215
 
349 cascade 216
                        num /= 10;
217
                }
218
        } else {
219
        write_char((x)+(y * 30), 0);
220
        write_ndigit_number_u(x, y, number, num, pad);
331 cascade 221
    }
222
}
223
 
224
/**
349 cascade 225
 * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
226
 * as /10th of the value
227
 * <num> represents the largest multiple of 10 that will still be displayable as
228
 * the first digit, so num = 10 will be 0-99 and so on
229
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 230
 */
349 cascade 231
void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) {
232
                // if number is largar than 99[..]9 we must decrease it
233
                while (number >= (num * 10)) {
234
                        number -= num * 10;
235
                }
236
 
331 cascade 237
 
349 cascade 238
                uint8_t started = 0;
239
                while (num > 0) {
240
                        uint8_t b = number / num;
241
                        if (b > 0 || started || num == 1) {
242
                                if ((num / 10) == 0) {
243
                                        if (!started) write_ascii_char((x - 1)+(y * 30), '0');
244
                                        write_char((x++)+(y * 30), 65); // decimal point
245
                                }
246
                                write_ascii_char((x++)+(y * 30), '0' + b);
247
                            started = 1;
248
                        } else {
249
                                if (pad) write_ascii_char((x++)+(y * 30), '0');
250
                                else write_ascii_char((x++)+(y * 30), ' ');
251
                        }
252
                        number -= b * num;
331 cascade 253
 
349 cascade 254
                        num /= 10;
255
                }
331 cascade 256
}
257
 
258
/**
349 cascade 259
 * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
260
 * as /10th of the value
261
 * <num> represents the largest multiple of 10 that will still be displayable as
262
 * the first digit, so num = 10 will be 0-99 and so on
263
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
331 cascade 264
 */
349 cascade 265
void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) {
266
    if (((uint16_t) number) > 32767) {
267
        number = number - 65536;
268
                num *= -1;
331 cascade 269
 
349 cascade 270
                // if number is smaller than -99[..]9 we must increase it
271
                while (number <= (num * 10)) {
272
                        number -= num * 10;
273
                }
331 cascade 274
 
349 cascade 275
                uint8_t started = 0;
331 cascade 276
 
349 cascade 277
                while (num < 0) {
278
                        uint8_t b = number / num;
279
                        if (pad) write_ascii_char((x)+(y * 30), '0');
280
                        if (b > 0 || started || num == 1) {
281
                                if ((num / 10) == 0) {
282
                                        if (!started) {
283
                                                write_ascii_char((x - 2)+(y * 30), '-');
284
                                                write_ascii_char((x - 1)+(y * 30), '0');
285
                                        }
286
                                        write_char((x++)+(y * 30), 65); // decimal point
287
                                } else if (!started) {
288
                                        write_char((x - 1)+(y * 30), 0x49); // minus
289
                                }
290
                            write_ascii_char((x++)+(y * 30), '0' + b);
291
                            started = 1;
292
                        } else {
293
                                write_ascii_char((x++)+(y * 30), 0);
294
                        }
295
                        number -= b * num;
296
 
297
                        num /= 10;
298
                }
299
        } else {
331 cascade 300
        write_char((x)+(y * 30), 0);
349 cascade 301
        write_ndigit_number_u_10th(x, y, number, num, pad);
331 cascade 302
    }
303
}
304
 
305
/**
306
 *  write <seconds> as human readable time at <x>/<y> to MAX7456 display mem
307
 */
308
void write_time(uint8_t x, uint8_t y, uint16_t seconds) {
309
    uint16_t min = seconds / 60;
310
    seconds -= min * 60;
349 cascade 311
    write_ndigit_number_u(x, y, min, 100, 0);
331 cascade 312
    write_char_xy(x + 3, y, 68);
349 cascade 313
    write_ndigit_number_u(x + 4, y, seconds, 10, 1);
331 cascade 314
}
315
 
316
/**
317
 * for testing write all chars to screen
318
 */
319
void write_all_chars() {
320
    uint16_t x = 3, y = 2, t = 0;
321
    while (t < 256) {
322
        write_char_xy(x++, y, t++);
323
        if (x > 25) {
324
            y++;
325
            x = 3;
326
        }
327
    }
328
}
329
 
330
/**
331
 * let the MAX7456 learn a new character at <number>
332
 * with <data>.
333
 */
334
void learn_char(uint8_t number, unsigned char* data) {
335
    // select character to write (CMAH)
336
    spi_send_byte(0x09, number);
337
 
338
    for (uint8_t i = 0; i < 54; i++) {
339
        // select 4pixel byte of char (CMAL)
340
        spi_send_byte(0x0A, i);
341
 
342
        // write 4pixel byte of char (CMDI)
343
        spi_send_byte(0x0B, data[i]);
344
    }
345
 
346
    // write to the NVM array from the shadow RAM (CMM)
347
    spi_send_byte(0x08, 0b10100000);
348
 
349
    // according to maxim writing to nvram takes about 12ms, lets wait longer
350
    _delay_ms(120);
351
}