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