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1
/****************************************************************************
1
/****************************************************************************
2
 *   Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje                    *
2
 *   Copyright (C) 2009 by Claas Anders "CaScAdE" Rathje                    *
3
 *   admiralcascade@gmail.com                                               *
3
 *   admiralcascade@gmail.com                                               *
4
 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
4
 *   Project-URL: http://www.mylifesucks.de/oss/c-osd/                      *
5
 *                                                                          *
5
 *                                                                          *
6
 *   This program is free software; you can redistribute it and/or modify   *
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   *
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.         *
8
 *   the Free Software Foundation; either version 2 of the License.         *
9
 *                                                                          *
9
 *                                                                          *
10
 *   This program is distributed in the hope that it will be useful,        *
10
 *   This program is distributed in the hope that it will be useful,        *
11
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
11
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
12
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
12
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
13
 *   GNU General Public License for more details.                           *
13
 *   GNU General Public License for more details.                           *
14
 *                                                                          *
14
 *                                                                          *
15
 *   You should have received a copy of the GNU General Public License      *
15
 *   You should have received a copy of the GNU General Public License      *
16
 *   along with this program; if not, write to the                          *
16
 *   along with this program; if not, write to the                          *
17
 *   Free Software Foundation, Inc.,                                        *
17
 *   Free Software Foundation, Inc.,                                        *
18
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
18
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.              *
19
 ****************************************************************************/
19
 ****************************************************************************/
20
 
20
 
21
#include <avr/io.h>
21
#include <avr/io.h>
22
#include <util/delay.h>
22
#include <util/delay.h>
23
#include <avr/pgmspace.h> 
23
#include <avr/pgmspace.h> 
24
#include "max7456_software_spi.h"
24
#include "max7456_software_spi.h"
25
 
25
 
26
/* ##########################################################################
26
/* ##########################################################################
27
 * MAX7456 SPI & Display stuff
27
 * MAX7456 SPI & Display stuff
28
 * ##########################################################################*/
28
 * ##########################################################################*/
29
 
29
 
30
/**
30
/**
31
 * Send a byte through SPI
31
 * Send a byte through SPI
32
 */
32
 */
33
void spi_send(uint8_t byte) {
33
void spi_send(uint8_t byte) {
34
    for (int8_t i = 7; i >= 0; i--) {
34
    for (int8_t i = 7; i >= 0; i--) {
35
        if (((byte >> i) & 1)) {
35
        if (((byte >> i) & 1)) {
36
            MAX_SDIN_HIGH
36
            MAX_SDIN_HIGH
37
        } else {
37
        } else {
38
            MAX_SDIN_LOW
38
            MAX_SDIN_LOW
39
        }
39
        }
40
        MAX_SCLK_HIGH
40
        MAX_SCLK_HIGH
41
        MAX_SCLK_LOW
41
        MAX_SCLK_LOW
42
    }
42
    }
43
}
43
}
44
 
44
 
45
/**
45
/**
46
 *  Send <byte> to <address> of MAX7456
46
 *  Send <byte> to <address> of MAX7456
47
 */
47
 */
48
void spi_send_byte(uint8_t address, uint8_t byte) {
48
void spi_send_byte(uint8_t address, uint8_t byte) {
49
    // start sending
49
    // start sending
50
    MAX_CS_LOW
50
    MAX_CS_LOW
51
 
51
 
52
    spi_send(address);
52
    spi_send(address);
53
    spi_send(byte);
53
    spi_send(byte);
54
 
54
 
55
    // end sending
55
    // end sending
56
    MAX_CS_HIGH
56
    MAX_CS_HIGH
57
}
57
}
58
 
58
 
59
/**
59
/**
60
 *  write a <character> to <address> of MAX7456 display memory
60
 *  write a <character> to <address> of MAX7456 display memory
61
 */
61
 */
62
void write_char(uint16_t address, char character) {
62
void write_char(uint16_t address, char character) {
63
    spi_send_byte(0x05, (address & 0xFF00) >> 8); // DMAH
63
    spi_send_byte(0x05, (address & 0xFF00) >> 8); // DMAH
64
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
64
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
65
    spi_send_byte(0x07, character); // DMDI
65
    spi_send_byte(0x07, character); // DMDI
66
}
66
}
67
 
67
 
68
/**
68
/**
69
 *  write a character <attribute> to <address> of MAX7456 display memory
69
 *  write a character <attribute> to <address> of MAX7456 display memory
70
 */
70
 */
71
void write_char_att(uint16_t address, char attribute) {
71
void write_char_att(uint16_t address, char attribute) {
72
    // the only important part is that the DMAH[1] is set
72
    // the only important part is that the DMAH[1] is set
73
    // so we add 2 which binary is the 2nd lowest byte
73
    // so we add 2 which binary is the 2nd lowest byte
74
    spi_send_byte(0x05, ((address & 0xFF00) >> 8) | 2); // DMAH
74
    spi_send_byte(0x05, ((address & 0xFF00) >> 8) | 2); // DMAH
75
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
75
    spi_send_byte(0x06, (address & 0x00FF)); // DMAL
76
    spi_send_byte(0x07, attribute); // DMDI
76
    spi_send_byte(0x07, attribute); // DMDI
77
}
77
}
78
 
78
 
79
/**
79
/**
80
 *  write a <character> at <x>/<y> to MAX7456 display memory
80
 *  write a <character> at <x>/<y> to MAX7456 display memory
81
 */
81
 */
82
void write_char_xy(uint8_t x, uint8_t y, char character) {
82
void write_char_xy(uint8_t x, uint8_t y, char character) {
83
    uint16_t address = y * 30 + x;
83
    uint16_t address = y * 30 + x;
84
    write_char(address, character);
84
    write_char(address, character);
85
}
85
}
86
 
86
 
87
/**
87
/**
88
 *  write a  character <attribute> at <x>/<y> to MAX7456 display memory
88
 *  write a  character <attribute> at <x>/<y> to MAX7456 display memory
89
 */
89
 */
90
void write_char_att_xy(uint8_t x, uint8_t y, char attribute) {
90
void write_char_att_xy(uint8_t x, uint8_t y, char attribute) {
91
    uint16_t address = y * 30 + x;
91
    uint16_t address = y * 30 + x;
92
    write_char_att(address, attribute);
92
    write_char_att(address, attribute);
93
}
93
}
94
 
94
 
95
/**
95
/**
96
 *  clear display memory
96
 *  clear display memory
97
 *  (also sets 8bit mode)
97
 *  (also sets 8bit mode)
98
 */
98
 */
99
void clear(void) {
99
void clear(void) {
100
    /*uint16_t memory_address = 0;
100
    /*uint16_t memory_address = 0;
101
    for (unsigned int a = 0; a < 480; a++) {
101
    for (unsigned int a = 0; a < 480; a++) {
102
        write_char(memory_address++, 0);
102
        write_char(memory_address++, 0);
103
    }*/
103
    }*/
104
        // clear all display-mem (DMM)
104
        // clear all display-mem (DMM)
105
    spi_send_byte(0x04, 0b01000100);
105
    spi_send_byte(0x04, 0b01000100);
106
 
106
 
107
    // clearing takes 12uS according to maxim so lets wait longer
107
    // clearing takes 12uS according to maxim so lets wait longer
108
    _delay_us(20);
108
    _delay_us(20);
109
}
109
}
110
 
110
 
111
/**
111
/**
112
 *  write an ascii <character> to <address> of MAX7456 display memory
112
 *  write an ascii <character> to <address> of MAX7456 display memory
113
 */
113
 */
114
void write_ascii_char(uint16_t address, char c) {
114
void write_ascii_char(uint16_t address, char c) {
115
    if (c == 32) c = 0; // remap space
115
    if (c == 32) c = 0; // remap space
116
    else if (c > 48 && c <= 57) c -= 48; // remap numbers
116
    else if (c > 48 && c <= 57) c -= 48; // remap numbers
117
    else if (c == '0') c = 10; // remap zero
117
    else if (c == '0') c = 10; // remap zero
118
    else if (c >= 65 && c <= 90) c -= 54; // remap big letters
118
    else if (c >= 65 && c <= 90) c -= 54; // remap big letters
119
    else if (c >= 97 && c <= 122) c -= 60; // remap small letters
119
    else if (c >= 97 && c <= 122) c -= 60; // remap small letters
120
    else if (c == '(') c = 63; // remap
120
    else if (c == '(') c = 63; // remap
121
    else if (c == ')') c = 64; // remap
121
    else if (c == ')') c = 64; // remap
122
    else if (c == '.') c = 65; // remap
122
    else if (c == '.') c = 65; // remap
123
    else if (c == '?') c = 66; // remap
123
    else if (c == '?') c = 66; // remap
124
    else if (c == ';') c = 67; // remap
124
    else if (c == ';') c = 67; // remap
125
    else if (c == ':') c = 68; // remap
125
    else if (c == ':') c = 68; // remap
126
    else if (c == ',') c = 69; // remap
126
    else if (c == ',') c = 69; // remap
127
    else if (c == '\'') c = 70; // remap
127
    else if (c == '\'') c = 70; // remap
128
    else if (c == '/') c = 71; // remap
128
    else if (c == '/') c = 71; // remap
129
    else if (c == '"') c = 72; // remap
129
    else if (c == '"') c = 72; // remap
130
    else if (c == '-') c = 73; // remap minus
130
    else if (c == '-') c = 73; // remap minus
131
    else if (c == '<') c = 74; // remap
131
    else if (c == '<') c = 74; // remap
132
    else if (c == '>') c = 75; // remap
132
    else if (c == '>') c = 75; // remap
133
    else if (c == '@') c = 76; // remap
133
    else if (c == '@') c = 76; // remap
134
    write_char(address, c);
134
    write_char(address, c);
135
}
135
}
136
 
136
 
137
/**
137
/**
138
 *  write an ascii <string> at <x>/<y> to MAX7456 display memory
138
 *  write an ascii <string> at <x>/<y> to MAX7456 display memory
139
 */
139
 */
140
void write_ascii_string(uint8_t x, uint8_t y, char *string) {
140
void write_ascii_string(uint8_t x, uint8_t y, char *string) {
141
    while (*string) {
141
    while (*string) {
142
        write_ascii_char(((x++)+(y * 30)), *string);
142
        write_ascii_char(((x++)+(y * 30)), *string);
143
        string++;
143
        string++;
144
    }
144
    }
145
}
145
}
146
 
146
 
147
/**
147
/**
148
 *  write an ascii <string> from progmen at <x>/<y> to MAX7456 display memory
148
 *  write an ascii <string> from progmen at <x>/<y> to MAX7456 display memory
149
 */
149
 */
150
void write_ascii_string_pgm(uint8_t x, uint8_t y, char *string) {
150
void write_ascii_string_pgm(uint8_t x, uint8_t y, char *string) {
151
        while (pgm_read_byte(string) != 0x00)
151
        while (pgm_read_byte(string) != 0x00)
152
                write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++));
152
                write_ascii_char(((x++)+(y * 30)), pgm_read_byte(string++));
153
}
153
}
154
 
154
 
155
/**
155
/**
156
 *  write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory
156
 *  write an <string> from progmen at <x>/<y> downwards to MAX7456 display memory
157
 */
157
 */
158
void write_string_pgm_down(uint8_t x, uint8_t y, char *string, uint8_t length) {
158
void write_string_pgm_down(uint8_t x, uint8_t y, char *string, uint8_t length) {
159
        while (length--)
159
        while (length--)
160
                write_char((x+(y++ * 30)), pgm_read_byte(string++));
160
                write_char((x+(y++ * 30)), pgm_read_byte(string++));
161
}
161
}
162
 
162
 
163
/**
163
/**
164
 * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
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
165
 * <num> represents the largest multiple of 10 that will still be displayable as
166
 * the first digit, so num = 10 will be 0-99 and so on
166
 * the first digit, so num = 10 will be 0-99 and so on
167
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
167
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
168
 */
168
 */
169
void write_ndigit_number_u(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) {
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
170
                // if number is largar than 99[..]9 we must decrease it
171
                while (number >= (num * 10)) {
171
                while (number >= (num * 10)) {
172
                        number -= num * 10;
172
                        number -= num * 10;
173
                }
173
                }
174
 
174
 
175
                uint8_t started = 0;
175
                uint8_t started = 0;
176
 
176
 
177
                while (num > 0) {
177
                while (num > 0) {
178
                        uint8_t b = number / num;
178
                        uint8_t b = number / num;
179
                        if (b > 0 || started || num == 1) {
179
                        if (b > 0 || started || num == 1) {
180
                            write_ascii_char((x++)+(y * 30), '0' + b);
180
                            write_ascii_char((x++)+(y * 30), '0' + b);
181
                            started = 1;
181
                            started = 1;
182
                        } else {
182
                        } else {
183
                                if (pad) write_ascii_char((x++)+(y * 30), '0');
183
                                if (pad) write_ascii_char((x++)+(y * 30), '0');
184
                                else write_ascii_char((x++)+(y * 30), 0);
184
                                else write_ascii_char((x++)+(y * 30), 0);
185
                        }
185
                        }
186
                        number -= b * num;
186
                        number -= b * num;
187
 
187
 
188
                        num /= 10;
188
                        num /= 10;
189
                }
189
                }
190
}
190
}
191
 
191
 
192
/**
192
/**
193
 * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
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
194
 * <num> represents the largest multiple of 10 that will still be displayable as
195
 * the first digit, so num = 10 will be 0-99 and so on
195
 * the first digit, so num = 10 will be 0-99 and so on
196
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
196
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
197
 */
197
 */
198
void write_ndigit_number_s(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) {
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) {
199
    if (((uint16_t) number) > 32767) {
200
        number = number - 65536;
200
        number = number - 65536;
201
                num *= -1;
201
                num *= -1;
202
 
202
 
203
                // if number is smaller than -99[..]9 we must increase it
203
                // if number is smaller than -99[..]9 we must increase it
204
                while (number <= (num * 10)) {
204
                while (number <= (num * 10)) {
205
                        number -= num * 10;
205
                        number -= num * 10;
206
                }
206
                }
207
 
207
 
208
                uint8_t started = 0;
208
                uint8_t started = 0;
209
 
209
 
210
                while (num < 0) {
210
                while (num < 0) {
211
                        uint8_t b = number / num;
211
                        uint8_t b = number / num;
212
                        if (pad) write_ascii_char((x)+(y * 30), '0');
212
                        if (pad) write_ascii_char((x)+(y * 30), '0');
213
                        if (b > 0 || started || num == 1) {
213
                        if (b > 0 || started || num == 1) {
214
                                if (!started) write_char((x - 1)+(y * 30), 0x49);
214
                                if (!started) write_char((x - 1)+(y * 30), 0x49);
215
                            write_ascii_char((x++)+(y * 30), '0' + b);
215
                            write_ascii_char((x++)+(y * 30), '0' + b);
216
                            started = 1;
216
                            started = 1;
217
                        } else {
217
                        } else {
218
                                write_ascii_char((x++)+(y * 30), 0);
218
                                write_ascii_char((x++)+(y * 30), 0);
219
                        }
219
                        }
220
                        number -= b * num;
220
                        number -= b * num;
221
 
221
 
222
                        num /= 10;
222
                        num /= 10;
223
                }
223
                }
224
        } else {
224
        } else {
225
        write_char((x)+(y * 30), 0);
225
        write_char((x)+(y * 30), 0);
226
        write_ndigit_number_u(x, y, number, num, pad);
226
        write_ndigit_number_u(x, y, number, num, pad);
227
    }
227
    }
228
}
228
}
229
 
229
 
230
/**
230
/**
231
 * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
231
 * Write only some digits of a unsigned <number> at <x>/<y> to MAX7456 display memory
232
 * as /10th of the value
232
 * as /10th of the value
233
 * <num> represents the largest multiple of 10 that will still be displayable as
233
 * <num> represents the largest multiple of 10 that will still be displayable as
234
 * the first digit, so num = 10 will be 0-99 and so on
234
 * the first digit, so num = 10 will be 0-99 and so on
235
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
235
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
236
 */
236
 */
237
void write_ndigit_number_u_10th(uint8_t x, uint8_t y, uint16_t number, int16_t num, uint8_t pad) {
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
238
                // if number is largar than 99[..]9 we must decrease it
239
                while (number >= (num * 10)) {
239
                while (number >= (num * 10)) {
240
                        number -= num * 10;
240
                        number -= num * 10;
241
                }
241
                }
242
               
242
               
243
 
243
 
244
                uint8_t started = 0;
244
                uint8_t started = 0;
245
                while (num > 0) {
245
                while (num > 0) {
246
                        uint8_t b = number / num;
246
                        uint8_t b = number / num;
247
                        if (b > 0 || started || num == 1) {
247
                        if (b > 0 || started || num == 1) {
248
                                if ((num / 10) == 0) {
248
                                if ((num / 10) == 0) {
249
                                        if (!started) write_ascii_char((x - 1)+(y * 30), '0');
249
                                        if (!started) write_ascii_char((x - 1)+(y * 30), '0');
250
                                        write_char((x++)+(y * 30), 65); // decimal point
250
                                        write_char((x++)+(y * 30), 65); // decimal point
251
                                }
251
                                }
252
                                write_ascii_char((x++)+(y * 30), '0' + b);
252
                                write_ascii_char((x++)+(y * 30), '0' + b);
253
                            started = 1;
253
                            started = 1;
254
                        } else {
254
                        } else {
255
                                if (pad) write_ascii_char((x++)+(y * 30), '0');
255
                                if (pad) write_ascii_char((x++)+(y * 30), '0');
256
                                else write_ascii_char((x++)+(y * 30), ' ');
256
                                else write_ascii_char((x++)+(y * 30), ' ');
257
                        }
257
                        }
258
                        number -= b * num;
258
                        number -= b * num;
259
 
259
 
260
                        num /= 10;
260
                        num /= 10;
261
                }
261
                }
262
}
262
}
263
 
263
 
264
/**
264
/**
265
 * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
265
 * Write only some digits of a signed <number> at <x>/<y> to MAX7456 display memory
266
 * as /10th of the value
266
 * as /10th of the value
267
 * <num> represents the largest multiple of 10 that will still be displayable as
267
 * <num> represents the largest multiple of 10 that will still be displayable as
268
 * the first digit, so num = 10 will be 0-99 and so on
268
 * the first digit, so num = 10 will be 0-99 and so on
269
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
269
 * <pad> = 1 will cause blank spaced to be filled up with zeros e.g. 007 instead of   7
270
 */
270
 */
271
void write_ndigit_number_s_10th(uint8_t x, uint8_t y, int16_t number, int16_t num, uint8_t pad) {
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) {
272
    if (((uint16_t) number) > 32767) {
273
        number = number - 65536;
273
        number = number - 65536;
274
                num *= -1;
274
                num *= -1;
275
 
275
 
276
                // if number is smaller than -99[..]9 we must increase it
276
                // if number is smaller than -99[..]9 we must increase it
277
                while (number <= (num * 10)) {
277
                while (number <= (num * 10)) {
278
                        number -= num * 10;
278
                        number -= num * 10;
279
                }
279
                }
280
 
280
 
281
                uint8_t started = 0;
281
                uint8_t started = 0;
282
 
282
 
283
                while (num < 0) {
283
                while (num < 0) {
284
                        uint8_t b = number / num;
284
                        uint8_t b = number / num;
285
                        if (pad) write_ascii_char((x)+(y * 30), '0');
285
                        if (pad) write_ascii_char((x)+(y * 30), '0');
286
                        if (b > 0 || started || num == 1) {
286
                        if (b > 0 || started || num == 1) {
287
                                if ((num / 10) == 0) {
287
                                if ((num / 10) == 0) {
288
                                        if (!started) {
288
                                        if (!started) {
289
                                                write_ascii_char((x - 2)+(y * 30), '-');
289
                                                write_ascii_char((x - 2)+(y * 30), '-');
290
                                                write_ascii_char((x - 1)+(y * 30), '0');
290
                                                write_ascii_char((x - 1)+(y * 30), '0');
291
                                        }
291
                                        }
292
                                        write_char((x++)+(y * 30), 65); // decimal point
292
                                        write_char((x++)+(y * 30), 65); // decimal point
293
                                } else if (!started) {
293
                                } else if (!started) {
294
                                        write_char((x - 1)+(y * 30), 0x49); // minus
294
                                        write_char((x - 1)+(y * 30), 0x49); // minus
295
                                }
295
                                }
296
                            write_ascii_char((x++)+(y * 30), '0' + b);
296
                            write_ascii_char((x++)+(y * 30), '0' + b);
297
                            started = 1;
297
                            started = 1;
298
                        } else {
298
                        } else {
299
                                write_ascii_char((x++)+(y * 30), 0);
299
                                write_ascii_char((x++)+(y * 30), 0);
300
                        }
300
                        }
301
                        number -= b * num;
301
                        number -= b * num;
302
 
302
 
303
                        num /= 10;
303
                        num /= 10;
304
                }
304
                }
305
        } else {
305
        } else {
306
        write_char((x)+(y * 30), 0);
306
        write_char((x)+(y * 30), 0);
307
        write_ndigit_number_u_10th(x, y, number, num, pad);
307
        write_ndigit_number_u_10th(x, y, number, num, pad);
308
    }
308
    }
309
}
309
}
310
 
310
 
311
/**
311
/**
312
 *  write <seconds> as human readable time at <x>/<y> to MAX7456 display mem
312
 *  write <seconds> as human readable time at <x>/<y> to MAX7456 display mem
313
 */
313
 */
314
void write_time(uint8_t x, uint8_t y, uint16_t seconds) {
314
void write_time(uint8_t x, uint8_t y, uint16_t seconds) {
315
    uint16_t min = seconds / 60;
315
    uint16_t min = seconds / 60;
316
    seconds -= min * 60;
316
    seconds -= min * 60;
317
    write_ndigit_number_u(x, y, min, 100, 0);
317
    write_ndigit_number_u(x, y, min, 100, 0);
318
    write_char_xy(x + 3, y, 68);
318
    write_char_xy(x + 3, y, 68);
319
    write_ndigit_number_u(x + 4, y, seconds, 10, 1);
319
    write_ndigit_number_u(x + 4, y, seconds, 10, 1);
320
}
320
}
321
 
321
 
322
/**
322
/**
323
 * for testing write all chars to screen
323
 * for testing write all chars to screen
324
 */
324
 */
325
void write_all_chars() {
325
void write_all_chars() {
326
    uint16_t x = 3, y = 2, t = 0;
326
    uint16_t x = 3, y = 2, t = 0;
327
    while (t < 256) {
327
    while (t < 256) {
328
        write_char_xy(x++, y, t++);
328
        write_char_xy(x++, y, t++);
329
        if (x > 25) {
329
        if (x > 25) {
330
            y++;
330
            y++;
331
            x = 3;
331
            x = 3;
332
        }
332
        }
333
    }
333
    }
334
}
334
}
335
 
335
 
336
/**
336
/**
337
 * let the MAX7456 learn a new character at <number>
337
 * let the MAX7456 learn a new character at <number>
338
 * with <data>.
338
 * with <data>.
339
 */
339
 */
340
void learn_char(uint8_t number, unsigned char* data) {
340
void learn_char(uint8_t number, unsigned char* data) {
341
    // select character to write (CMAH)
341
    // select character to write (CMAH)
342
    spi_send_byte(0x09, number);
342
    spi_send_byte(0x09, number);
343
 
343
 
344
    for (uint8_t i = 0; i < 54; i++) {
344
    for (uint8_t i = 0; i < 54; i++) {
345
        // select 4pixel byte of char (CMAL)
345
        // select 4pixel byte of char (CMAL)
346
        spi_send_byte(0x0A, i);
346
        spi_send_byte(0x0A, i);
347
 
347
 
348
        // write 4pixel byte of char (CMDI)
348
        // write 4pixel byte of char (CMDI)
349
        spi_send_byte(0x0B, data[i]);
349
        spi_send_byte(0x0B, data[i]);
350
    }
350
    }
351
 
351
 
352
    // write to the NVM array from the shadow RAM (CMM)
352
    // write to the NVM array from the shadow RAM (CMM)
353
    spi_send_byte(0x08, 0b10100000);
353
    spi_send_byte(0x08, 0b10100000);
354
 
354
 
355
    // according to maxim writing to nvram takes about 12ms, lets wait longer
355
    // according to maxim writing to nvram takes about 12ms, lets wait longer
356
    _delay_ms(120);
356
    _delay_ms(120);
357
}
357
}
358
 
358
 
359
/**
359
/**
360
 * wirte a <position> at <x>/<y> assuming it is a gps position for long-/latitude
360
 * wirte a <position> at <x>/<y> assuming it is a gps position for long-/latitude
361
 */
361
 */
362
void write_gps_pos(uint8_t x, uint8_t y, int32_t position) {
362
void write_gps_pos(uint8_t x, uint8_t y, int32_t position) {
363
        if (((uint32_t) position > 2147483647)) {
363
        if (position < 0) {
364
                position = position - 4294967295;
364
                position ^= ~0;
-
 
365
                position++;
365
                write_char_xy(x++, y, 0x49); // minus
366
                write_char_xy(x++, y, 0x49); // minus
366
        } else {
367
        } else {
367
                write_char_xy(x++, y, 0); // clear ('+' would be nice, maybe later)
368
                write_char_xy(x++, y, 0); // clear ('+' would be nice, maybe later)
368
        }
369
        }
369
        write_ndigit_number_u(x, y, (uint16_t) (position / (int32_t) 10000000), 100, 1);
370
        write_ndigit_number_u(x, y, (uint16_t) (position / (int32_t) 10000000), 100, 1);
370
        write_char_xy(x + 3, y, 65); // decimal point
371
        write_char_xy(x + 3, y, 65); // decimal point
371
        position = position - ((position / (int32_t) 10000000) * (int32_t) 10000000);
372
        position = position - ((position / (int32_t) 10000000) * (int32_t) 10000000);
372
        write_ndigit_number_u(x + 4, y, (uint16_t) (position / (int32_t) 1000), 1000, 1);
373
        write_ndigit_number_u(x + 4, y, (uint16_t) (position / (int32_t) 1000), 1000, 1);
373
        position = position - ((uint16_t) (position / (int32_t) 1000) * (int32_t) 1000);
374
        position = position - ((uint16_t) (position / (int32_t) 1000) * (int32_t) 1000);
374
        write_ndigit_number_u(x + 8, y, (uint16_t) position, 100, 1);
375
        write_ndigit_number_u(x + 8, y, (uint16_t) position, 100, 1);
375
        write_char_xy(x + 11, y, 0xD0); // degree symbol
376
        write_char_xy(x + 11, y, 0xD0); // degree symbol
376
}
377
}
377
 
378