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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