1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
#ifndef SKIP_GPIO
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <assert.h>
#include "multiplexer.h"
/** TODO
void printButton(int g)
{
if (GET_GPIO(g)) // !=0 <-> bit is 1 <- port is HIGH=3.3V
printf("Button pressed!\n");
else // port is LOW=0V
printf("Button released!\n");
} **/
//
// Set up a memory regions to access GPIO
//
int multiplexer_setup_root()
{
#ifndef SKIP_GPIO
/* open /dev/mem */
if ((mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0) {
perror("can't open /dev/mem");
return EXIT_FAILURE;
}
/* mmap GPIO */
gpio_map = mmap(
NULL, //Any adddress in our space will do
BLOCK_SIZE, //Map length
PROT_READ|PROT_WRITE,// Enable reading & writting to mapped memory
MAP_SHARED, //Shared with other processes
mem_fd, //File to map
GPIO_BASE //Offset to GPIO peripheral
);
close(mem_fd); //No need to keep mem_fd open after mmap
if (gpio_map == MAP_FAILED) {
perror("mmap error");
return EXIT_FAILURE;
}
// Always use volatile pointer!
gpio = (volatile unsigned *)gpio_map;
#endif
} // multiplexer_setup_root
//
// Shift the bits provided in content into the display
//
void *put_on_display(void *param)
{
t_display_data *display_data = param;
int line, column;
#ifndef SKIP_GPIO
struct timespec start_time, stop_time;
#endif
while (display_data -> keep_running) {
#ifdef SKIP_GPIO
usleep(10000);
printf("=\n");
#endif
display_data -> is_buf = display_data -> should_buf;
#ifdef SKIP_GPIO
for (line=0; line<7; line++) {
for (column=0; column<40; column++) {
if (display_data -> buf[display_data -> is_buf][column] & (0x01 << line))
printf("X");
else
printf(" ");
#else
for (line=7; line>=0; line--) {
GPIO_CLR = 1<<GATE_PIN; // Licht an
if (clock_gettime(CLOCK_MONOTONIC_RAW, &start_time) != 0) {
display_data -> keep_running = 0;
perror("clock_gettime failed");
break;
}
for (column=0; column<8; column++) {
GPIO_CLR = 1<<SER_CLK_PIN;
GPIO_ALTER(column + line == 7) = 1<<SER_DAT_PIN;
usleep(5);
GPIO_SET = 1<<SER_CLK_PIN;
usleep(5);
}
for (column=39; column>=0; column--) {
GPIO_CLR = 1<<SER_CLK_PIN;
GPIO_ALTER(display_data -> buf[display_data -> is_buf][column] & (0x01 << line)) = 1<<SER_DAT_PIN;
usleep(5);
GPIO_SET = 1<<SER_CLK_PIN;
usleep(5);
#endif
}
#ifdef SKIP_GPIO
printf("\n");
#else
if (clock_gettime(CLOCK_MONOTONIC_RAW, &stop_time) != 0) {
display_data -> keep_running = 0;
perror("clock_gettime failed");
break;
}
// wait until start_time + 1ms
usleep((start_time.tv_sec - stop_time.tv_sec) * 1000000 + (start_time.tv_nsec - stop_time.tv_nsec) / 1000 + 1000);
GPIO_SET = 1<<GATE_PIN; // Licht aus
usleep(5);
GPIO_CLR = 1<<PAR_CLK_PIN;
usleep(5);
GPIO_SET = 1<<PAR_CLK_PIN;
#endif
}
}
return NULL;
} // put_on_display
// scroll the text over the display
void *scroll_it(void *param)
{
t_scroll_data *scroll_data = (t_scroll_data *) param;
t_scroll_buffer buf[3];
for (int i=0; i<3; i++)
memset(&buf[i], 0, sizeof(buf[i]));
t_display_data display_data;
multiplexer_setup_non_root(&display_data);
int is_buf = 0;
int column = 0;
struct timespec start_time, stop_time;
while (scroll_data -> keep_running) {
if (clock_gettime(CLOCK_MONOTONIC_RAW, &start_time) != 0) {
scroll_data -> keep_running = 0;
perror("clock_gettime failed");
break;
}
if (scroll_data -> update) {
if ((buf[is_buf] . len != scroll_data -> input_len) || (memcmp(&buf[is_buf] . buf[buf[is_buf] . start], scroll_data -> input, scroll_data -> input_len) != 0)) {
is_buf = (is_buf + 1) % 2;
// copy the currently visible, old content
memcpy(buf[is_buf] . buf, &buf[(is_buf + 1) % 2] . buf[column + 1], 39);
buf[is_buf] . start = 39;
// set the length of the new content
buf[is_buf] . len = scroll_data -> input_len;
// copy the new content from input
for (int i=0; i<2; i++)
memcpy(
&buf[is_buf] . buf[39 + i * buf[is_buf] . len],
scroll_data -> input,
buf[is_buf] . len
);
column = 0;
}
// clear update flag
scroll_data -> update = 0;
}
for (int i=0; i<40; i++)
display_data . buf[(display_data . should_buf + 1) % 3][i] =
buf[is_buf] . buf[column + i];
column++;
if (buf[is_buf] . len > 0)
while (column >= buf[is_buf] . start + buf[is_buf] . len)
column -= buf[is_buf] . len;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &stop_time) != 0) {
scroll_data -> keep_running = 0;
perror("clock_gettime failed");
break;
}
// wait until start_time + 50ms
usleep((start_time.tv_sec - stop_time.tv_sec) * 1000000 + (start_time.tv_nsec - stop_time.tv_nsec) / 1000 + 50000);
display_data . should_buf = (display_data . should_buf + 1) % 3;
}
display_data . keep_running = 0;
pthread_join(display_data . thread_id, NULL);
} // scroll_it
void multiplexer_setup_non_root(t_display_data *display_data)
{
#ifndef SKIP_GPIO
// must use INP_GPIO before we can use OUT_GPIO
INP_GPIO(SER_DAT_PIN);
OUT_GPIO(SER_DAT_PIN);
INP_GPIO(SER_CLK_PIN);
OUT_GPIO(SER_CLK_PIN);
INP_GPIO(GATE_PIN);
OUT_GPIO(GATE_PIN);
INP_GPIO(PAR_CLK_PIN);
OUT_GPIO(PAR_CLK_PIN);
INP_GPIO(SENSE_PIN);
#endif
for (int i=0; i<3; i++)
memset(display_data -> buf[i],0,40);
display_data -> is_buf = 0;
display_data -> should_buf = 0;
display_data -> keep_running = 1;
pthread_create(&display_data -> thread_id, NULL, put_on_display, display_data);
return;
} // multiplexer_setup_non_root
void multiplexer_setup_scroll(t_scroll_data *scroll_data)
{
scroll_data -> update = 0;
scroll_data -> keep_running = 1;
pthread_create(&scroll_data -> thread_id, NULL, scroll_it, scroll_data);
return;
} // multiplexer_setup_scroll
|
