[1] | 1 | #include <stdio.h> |
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| 2 | #include <stdlib.h> |
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| 3 | #include <unistd.h> |
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| 4 | #include <errno.h> |
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| 5 | #include <fcntl.h> |
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| 6 | #include <signal.h> |
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| 7 | #include <termios.h> |
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| 8 | #include <sys/ioctl.h> |
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| 9 | |
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| 10 | volatile int quit; |
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| 11 | |
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| 12 | static void |
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| 13 | set_quit(int s) |
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| 14 | { |
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| 15 | quit = 1; |
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| 16 | } |
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| 17 | |
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| 18 | int |
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| 19 | main(int argc, const char *argv[]) |
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| 20 | { |
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| 21 | int d; |
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| 22 | int bytes; |
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| 23 | int nfds; |
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| 24 | char buf[256]; |
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| 25 | int i; |
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| 26 | fd_set rfds; |
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| 27 | char gpio[2], current[4], tension[4]; |
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| 28 | char *endp; |
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| 29 | int currenti, tensioni; |
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| 30 | int val; |
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| 31 | |
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| 32 | enum { |
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| 33 | INIT, |
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| 34 | GPIO, |
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| 35 | CURRENT, |
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| 36 | TENSION, |
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| 37 | MARK |
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| 38 | } state; |
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| 39 | |
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| 40 | struct termios t, ot; |
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| 41 | |
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| 42 | state = INIT; |
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| 43 | currenti = tensioni = 0; |
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| 44 | |
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| 45 | if (argc != 2) { |
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| 46 | errx(1, "usage: %s <device>", argv[0]); |
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| 47 | } |
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| 48 | |
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| 49 | d = open(argv[1], O_RDWR | O_NOCTTY | O_NONBLOCK, 0); |
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| 50 | if (d < 0) { |
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| 51 | err(1, "open %s", argv[1]); |
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| 52 | } |
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| 53 | fprintf(stderr, "o\n"); |
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| 54 | |
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| 55 | if (tcgetattr(d, &ot) < 0) { |
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| 56 | err(1, "tcgetattr"); |
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| 57 | } |
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| 58 | fprintf(stderr, "tg\n"); |
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| 59 | |
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| 60 | quit = 0; |
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| 61 | |
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| 62 | if (signal(SIGINT, set_quit) == SIG_ERR) { |
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| 63 | err(1, "signal(SIGINT)"); |
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| 64 | } |
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| 65 | if (signal(SIGQUIT, set_quit) == SIG_ERR) { |
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| 66 | err(1, "signal(SIGQUIT)"); |
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| 67 | } |
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| 68 | if (signal(SIGPIPE, set_quit) == SIG_ERR) { |
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| 69 | err(1, "signal(SIGPIPE)"); |
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| 70 | } |
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| 71 | if (signal(SIGTERM, set_quit) == SIG_ERR) { |
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| 72 | err(1, "signal(SIGTERM)"); |
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| 73 | } |
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| 74 | |
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| 75 | t = ot; |
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| 76 | cfmakeraw(&t); |
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| 77 | t.c_cflag |= CLOCAL; |
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| 78 | t.c_cflag &= ~CRTSCTS; |
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| 79 | cfsetspeed(&t, B921600); |
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| 80 | |
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| 81 | if (tcsetattr(d, TCSANOW | TCSAFLUSH, &t) < 0) { |
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| 82 | err(1, "tcsetattr"); |
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| 83 | } |
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| 84 | fprintf(stderr, "tty ready\n"); |
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| 85 | FD_ZERO(&rfds); |
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| 86 | while (quit == 0) { |
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| 87 | FD_SET(d, &rfds); |
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| 88 | nfds = select(d+1, &rfds, NULL, NULL, NULL); |
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| 89 | if (nfds > 0 && FD_ISSET(d, &rfds)) { |
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| 90 | bytes = read(d, buf, sizeof(buf)); |
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| 91 | if (bytes < 0 && errno != EAGAIN) { |
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| 92 | warn("read"); |
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| 93 | } |
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| 94 | for (i = 0; i < bytes; i++) { |
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| 95 | switch(state) { |
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| 96 | case INIT: |
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| 97 | /* look for an X mark */ |
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| 98 | if (buf[i] == 'X') |
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| 99 | state = GPIO; |
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| 100 | break; |
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| 101 | case GPIO: |
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| 102 | gpio[0] = buf[i]; |
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| 103 | gpio[1] = '\0'; |
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| 104 | val = strtol(gpio, &endp, 16); |
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| 105 | if (*endp != '\0') { |
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| 106 | fprintf(stderr, |
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| 107 | "gpio error: %c\n", |
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| 108 | *endp); |
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| 109 | state = INIT; |
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| 110 | } else { |
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| 111 | state = CURRENT; |
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| 112 | currenti = 0; |
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| 113 | printf("%2d ", val); |
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| 114 | } |
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| 115 | break; |
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| 116 | case CURRENT: |
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| 117 | current[currenti] = buf[i]; |
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| 118 | currenti++; |
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| 119 | if (currenti < 3) |
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| 120 | break; |
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| 121 | current[currenti] = '\0'; |
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| 122 | val = strtol(current, &endp, 16); |
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| 123 | if (*endp != '\0') { |
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| 124 | fprintf(stderr, |
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| 125 | "current error: %c\n", |
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| 126 | *endp); |
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| 127 | state = INIT; |
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| 128 | } else { |
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| 129 | state = TENSION; |
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| 130 | tensioni = 0; |
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| 131 | printf("%4d ", val); |
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| 132 | } |
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| 133 | break; |
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| 134 | case TENSION: |
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| 135 | tension[tensioni] = buf[i]; |
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| 136 | tensioni++; |
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| 137 | if (tensioni < 3) |
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| 138 | break; |
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| 139 | tension[tensioni] = '\0'; |
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| 140 | val = strtol(tension, &endp, 16); |
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| 141 | if (*endp != '\0') { |
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| 142 | fprintf(stderr, |
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| 143 | "tension error: %c\n", |
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| 144 | *endp); |
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| 145 | state = INIT; |
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| 146 | } else { |
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| 147 | state = MARK; |
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| 148 | printf("%4d\n", val); |
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| 149 | } |
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| 150 | break; |
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| 151 | case MARK: |
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| 152 | if (buf[i] != 'X') { |
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| 153 | fprintf(stderr, |
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| 154 | "mark error: %c\n", |
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| 155 | buf[i]); |
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| 156 | state = INIT; |
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| 157 | } else { |
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| 158 | state = GPIO; |
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| 159 | } |
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| 160 | break; |
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| 161 | } |
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| 162 | } |
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| 163 | } else if (nfds < 0) { |
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| 164 | warn("select"); |
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| 165 | } |
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| 166 | } |
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| 167 | if (tcsetattr(d, TCSANOW, &ot) < 0) { |
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| 168 | err(1, "restore tcsetattr"); |
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| 169 | } |
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| 170 | exit(0); |
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| 171 | } |
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| 172 | |
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| 173 | |
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