Last change
on this file since 266 was
231,
checked in by max@…, 7 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 | |
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1 | /* |
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2 | ******************************************************************************* |
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3 | * Authors: |
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4 | * Maxime Villard, 2017 |
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5 | * Jankovic Marco, 01/07/2014 |
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6 | ******************************************************************************* |
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7 | */ |
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8 | |
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9 | #define XOPEN_SOURCE |
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10 | |
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11 | #include <stdio.h> |
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12 | #include <string.h> |
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13 | #include <stdlib.h> |
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14 | #include <stdint.h> |
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15 | #include <unistd.h> |
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16 | #include <fcntl.h> |
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17 | #include <sys/types.h> |
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18 | #include <sys/stat.h> |
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19 | #include <sys/select.h> |
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20 | #include <sys/time.h> |
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21 | #include <pthread.h> |
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22 | #include <signal.h> |
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23 | #include <sys/ioctl.h> |
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24 | #include <termios.h> |
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25 | #include <time.h> |
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26 | #include <sys/types.h> |
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27 | |
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28 | #include <err.h> |
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29 | |
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30 | #include "config.h" |
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31 | |
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32 | #define READ_LEN 64 |
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33 | #define FIFO_LIMIT_SIZE 512 |
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34 | |
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35 | #define XON 0x11 |
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36 | #define XOFF 0x13 |
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37 | |
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38 | #define UNUSED(x) (void)(x) /* for unused variables */ |
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39 | |
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40 | /* |
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41 | * Encoding for the multiplexer: we use packets, and their size is at most 2 |
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42 | * bytes. |
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43 | * |
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44 | * If [the first byte of the packet has bit7==1] |
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45 | * --> bits [0;6] are the TTY number |
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46 | * --> the next byte is the character (char, as usual) |
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47 | * Else If [the first byte of the packet == 0x11] |
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48 | * --> it's XON |
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49 | * Else If [the first byte of the packet == 0x13] |
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50 | * --> it's XOFF |
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51 | * Else |
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52 | * --> unknown packet, drop it |
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53 | */ |
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54 | #define PKT_TTY 0 |
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55 | #define PKT_DAT 1 |
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56 | #define PACKET_SIZE 2 |
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57 | |
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58 | void *thread_mux_demux(void *a); |
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59 | void *thread_read_rx(void *a); |
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60 | void *thread_write_tx(void *a); |
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61 | |
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62 | /******************************************************************************/ |
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63 | |
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64 | extern int slave_fd[NB_CHANNELS]; |
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65 | extern int master_fd[NB_CHANNELS]; |
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66 | extern int fifo_rx_fd; |
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67 | extern int fifo_tx_fd; |
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68 | extern int device_fd; |
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69 | extern int test_rx_fd; |
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70 | extern int test_tx_fd; |
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71 | |
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72 | /******************************************************************************/ |
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73 | |
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