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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <arpa/inet.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <poll.h>
#include <sys/types.h>
#include <error.h>
#include <fcntl.h>
#define termios asmtermios
#define winsize asmwinsize
#define termio asmtermio
#include <asm/termios.h>
#undef termios
#undef winsize
#undef termio
#define S0(x) (x ? x : "")
// start bit: low, 2 stop bits high
struct artnet {
char name[8]; // Art-Net\0
char opcode[2]; // 0x5000 in LE: { 0x00, 0x50 }
uint8_t version_hi; // 0
uint8_t version_lo; // 14
uint8_t sequence; // set to 0 to disable sequencing
uint8_t physical; // original universe
uint8_t sub_uni;
uint8_t net;
uint8_t length_hi;
uint8_t length_lo;
unsigned char data[512];
} __attribute__((packed));
int samomor = 0;
void handle_me (int s __attribute__((unused))) {
samomor++;
}
int rate (int what_rate, int uart) {
int r = 0;
struct termios2 uartattr2;
if (ioctl(uart, TCGETS2, &uartattr2) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "ioctl TCGETS2, fd: %d", uart);
r = 1;
goto r;
}
uartattr2.c_cflag &= ~CBAUD;
uartattr2.c_cflag |= BOTHER;
uartattr2.c_ispeed = what_rate;
uartattr2.c_ospeed = what_rate;
if (ioctl(uart, TCSETS2, &uartattr2) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "ioctl TCSETS2");
r = 2;
goto r;
}
r:
return r;
}
int main (int argc, char ** argv) {
int r = 0;
if (argc != 1+1)
error_at_line(1, 0, __FILE__, __LINE__, "usage: %s /dev/ttyUSB0", S0(argv[0]));
struct sigaction act = {
.sa_handler = handle_me,
.sa_flags = SA_RESTART
};
if (sigaction(SIGINT, &act, NULL) == -1)
error_at_line(2, errno, __FILE__, __LINE__, "sigaction");
int sock = -1;
int uart = open(argv[1], O_WRONLY | O_NOCTTY | O_NDELAY | O_CLOEXEC);
if (uart == -1)
error_at_line(3, errno, __FILE__, __LINE__, "open");
struct termios uartattr;
if (tcgetattr(uart, &uartattr) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "tcgetattr");
r = 4;
goto r;
}
uartattr.c_iflag = 0;
uartattr.c_oflag = 0;
uartattr.c_cflag = CS8 | CSTOPB;
uartattr.c_lflag = 0;
if (tcflush(uart, TCIOFLUSH) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "tcflush");
r = 5;
goto r;
}
if (tcsetattr(uart, TCSANOW, &uartattr) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "tcsetattr");
r = 6;
goto r;
}
if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "socket");
r = 7;
goto r;
}
int z = 1;
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &z, sizeof z) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "setsockopt");
r = 8;
goto r;
}
struct sockaddr_in bind_address = {
.sin_family = AF_INET,
.sin_port = htons(6454),
.sin_addr = {
.s_addr = INADDR_ANY
}
};
if (bind(sock, (struct sockaddr *) &bind_address, sizeof bind_address) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "bind");
r = 9;
goto r;
}
long long last_dmx_burst = 0;
struct artnet udp;
while (!samomor) {
struct pollfd pollfds[2];
pollfds[0].fd = sock;
pollfds[0].events = POLLIN | POLLERR | POLLHUP | POLLNVAL;
// pollfds[1].fd = uart;
// pollfds[1].events = POLLOUT | POLLERR | POLLHUP | POLLNVAL;
int poll_return;
fprintf(stderr, "before poll\n");
if ((poll_return = poll(pollfds, 1 /* corr: I don't care about uart */, -1)) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "poll");
r = 10;
goto r;
}
fprintf(stderr, "after poll\n");
if (!poll_return) { // this can't happen, timeout is -1
error_at_line(0, 0, __FILE__, __LINE__, "this can't happen, poll returned 0 and timeout was -1\n");
r = 11;
goto r;
}
int both_events = pollfds[0].revents /* | pollfds[1].revents */;
if ((both_events & POLLERR) | (both_events & POLLHUP) | (both_events & POLLNVAL)) {
error_at_line(0, 0, __FILE__, __LINE__, "(both_events & POLLERR) | (both_events & POLLHUP) | (both_events & POLLNVAL)");
r = 12;
goto r;
}
struct sockaddr_in sender;
socklen_t sender_len = sizeof sender;
ssize_t bytes = recvfrom(sock, &udp, sizeof udp, MSG_DONTWAIT, (struct sockaddr *) &sender, &sender_len);
if (bytes == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "recvfrom");
r = 13;
goto r;
} else {
fprintf(stderr, "received %ld bytes from %s:%d\n", bytes, inet_ntoa(sender.sin_addr), ntohs(sender.sin_port));
}
if (udp.opcode[0] != 0x00 || udp.opcode[1] != 0x50)
continue;
// if (bytes < 530)
// raise(SIGINT);
for (int i = 0; i < 512; i++)
if (udp.data[i] != 0)
fprintf(stderr, "\tDMX channel %d is %u\n", i+1, udp.data[i]);
struct timespec current_time;
if (clock_gettime(CLOCK_MONOTONIC, ¤t_time) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "clock_gettime");
r = 14;
goto r;
}
long long current_time_ms = current_time.tv_sec*1000+current_time.tv_nsec/1000000;
if (current_time_ms >= last_dmx_burst+50) {
last_dmx_burst = current_time_ms;
} else
continue;
if (tcflush(uart, TCIOFLUSH) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "tcflush");
r = 15;
goto r;
}
switch (rate(10000, uart)) {
case 1:
r = 16;
goto r;
break;
case 2:
r = 17;
goto r;
break;
default:
break;
}
if (tcflush(uart, TCIOFLUSH) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "tcflush");
r = 18;
goto r;
}
usleep(10000);
if (write(uart, "\0", 1) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "write packet start sequence");
r = 19;
goto r;
}
usleep(1000);
switch (rate(250000, uart)) {
case 1:
r = 20;
goto r;
break;
case 2:
r = 21;
goto r;
break;
default:
break;
}
udp.data[-1] = '\0';
#pragma GCC diagnostic ignored "-Wstringop-overread"
if (write(uart, udp.data-1, 513) == -1) {
error_at_line(0, errno, __FILE__, __LINE__, "write packet data");
r = 21;
goto r;
}
#pragma GCC diagnostic pop
}
r:
fprintf(stderr, "closing fds and returning\n");
if (close(uart) == -1)
error_at_line(22, errno, __FILE__, __LINE__, "close(uart)");
if (sock != -1)
if (close(sock) == -1)
error_at_line(23, errno, __FILE__, __LINE__, "close(sock)");
return r;
}
|
