source: trunk/tools/alcons/common.h @ 549

Last change on this file since 549 was 231, checked in by max@…, 5 years ago

Add a serial port multiplexer, usable to communicate with the
ALMOS-MKH kernel over a serial port.

File size: 1.7 KB
Line 
1/*
2 *******************************************************************************
3 * Authors:
4 *     Maxime Villard, 2017
5 *     Jankovic Marco, 01/07/2014
6 *******************************************************************************
7 */
8
9#define XOPEN_SOURCE
10
11#include <stdio.h>
12#include <string.h>
13#include <stdlib.h>
14#include <stdint.h>
15#include <unistd.h>
16#include <fcntl.h>
17#include <sys/types.h>
18#include <sys/stat.h>
19#include <sys/select.h>
20#include <sys/time.h>
21#include <pthread.h>
22#include <signal.h>
23#include <sys/ioctl.h>
24#include <termios.h>
25#include <time.h>
26#include <sys/types.h>
27
28#include <err.h>
29
30#include "config.h"
31
32#define READ_LEN        64
33#define FIFO_LIMIT_SIZE 512
34
35#define XON             0x11
36#define XOFF    0x13
37
38#define UNUSED(x)       (void)(x) /* for unused variables */
39
40/*
41 * Encoding for the multiplexer: we use packets, and their size is at most 2
42 * bytes.
43 *
44 * If [the first byte of the packet has bit7==1]
45 * --> bits [0;6] are the TTY number
46 * --> the next byte is the character (char, as usual)
47 * Else If [the first byte of the packet == 0x11]
48 * --> it's XON
49 * Else If [the first byte of the packet == 0x13]
50 * --> it's XOFF
51 * Else
52 * --> unknown packet, drop it
53 */
54#define PKT_TTY 0
55#define PKT_DAT 1
56#define PACKET_SIZE     2
57
58void *thread_mux_demux(void *a);
59void *thread_read_rx(void *a);
60void *thread_write_tx(void *a);
61
62/******************************************************************************/
63
64extern int slave_fd[NB_CHANNELS];
65extern int master_fd[NB_CHANNELS];
66extern int fifo_rx_fd;
67extern int fifo_tx_fd;
68extern int device_fd;
69extern int test_rx_fd;
70extern int test_tx_fd;
71
72/******************************************************************************/
73
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