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Last change
on this file since 518 was
231,
checked in by max@…, 7 years ago
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Add a serial port multiplexer, usable to communicate with the
ALMOS-MKH kernel over a serial port.
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File size:
1.7 KB
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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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