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 <string.h> |
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5 | #include <errno.h> |
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6 | #include <err.h> |
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7 | #include <fcntl.h> |
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8 | #include <signal.h> |
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9 | #include <termios.h> |
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10 | #include <sys/ioctl.h> |
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11 | #include <sys/select.h> |
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12 | |
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13 | struct scale { |
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14 | float read; |
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15 | float result; |
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16 | }; |
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17 | |
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18 | struct scale current_scale; |
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19 | struct scale voltage_scale; |
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20 | float current_r = 0; |
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21 | |
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22 | const float current_ra[] = {0.2, 0.1, 0.05, 0.02}; |
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23 | |
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24 | volatile int quit; |
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25 | const char *prog; |
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26 | |
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27 | static void |
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28 | set_quit(int s) |
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29 | { |
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30 | quit = 1; |
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31 | } |
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32 | |
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33 | static void |
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34 | usage() |
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35 | { |
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36 | errx(1, "usage: %s -c[1|2|3|4] -v[1|2|3] [-n] <device>", prog); |
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37 | } |
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38 | |
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39 | static void |
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40 | get_cal_data(const char *b, int ci, int vi) |
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41 | { |
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42 | int cr[4], vr[3]; |
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43 | float ca[4], vv[3]; |
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44 | int ret; |
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45 | |
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46 | ret = sscanf(b, "cal_data %d %f %d %f %d %f %d %f %d %f %d %f %d %f", |
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47 | &cr[0], &ca[0], &cr[1], &ca[1], &cr[2], &ca[2], &cr[3], &ca[3], |
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48 | &vr[0], &vv[0], &vr[1], &vv[1], &vr[2], &vv[2]); |
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49 | if (ret != 14) { |
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50 | errx(1, "cal_data: converted only %d\n", ret); |
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51 | } |
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52 | for (int i = 0; i < 4; i++) { |
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53 | printf("cr %d ca %f\n", cr[i], ca[i]); |
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54 | } |
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55 | for (int i = 0; i < 3; i++) { |
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56 | printf("vr %d vv %f\n", vr[i], vv[i]); |
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57 | } |
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58 | current_scale.read = cr[ci - 1]; |
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59 | current_scale.result = ca[ci - 1]; |
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60 | voltage_scale.read = vr[vi - 1]; |
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61 | voltage_scale.result = vv[vi - 1]; |
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62 | } |
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63 | |
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64 | static void |
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65 | readline(int d, char *buf, int l) |
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66 | { |
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67 | int i; |
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68 | int bytes; |
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69 | do { |
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70 | for (i = 0; i < l; i++) { |
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71 | do { |
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72 | bytes = read(d, &buf[i], 1); |
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73 | if (quit) |
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74 | return; |
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75 | } while ((bytes < 0 && errno == EAGAIN) || buf[i] == '\r'); |
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76 | if (bytes != 1) { |
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77 | fprintf(stderr, "readline: read %d\n", bytes); |
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78 | err(1, "read line"); |
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79 | } |
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80 | if (buf[i] == '\n') |
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81 | break; |
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82 | } |
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83 | } while (i == 0); |
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84 | if (buf[i] != '\n') { |
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85 | warnx("realine: end of line not found"); |
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86 | } |
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87 | buf[i] = '\0'; |
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88 | } |
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89 | |
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90 | int |
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91 | main(int argc, char * const argv[]) |
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92 | { |
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93 | int d; |
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94 | int bytes; |
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95 | int nfds; |
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96 | int lineno = 0; |
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97 | int nopt = 0; |
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98 | char buf[256]; |
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99 | int i; |
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100 | fd_set rfds; |
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101 | char gpio[3], current[4], tension[4]; |
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102 | char *endp; |
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103 | int gpioi, currenti, tensioni; |
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104 | float current_a, tension_v; |
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105 | int val, gpio_val; |
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106 | int c_opt = 0, v_opt = 0; |
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107 | extern char *optarg; |
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108 | extern int optind; |
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109 | int ch; |
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110 | enum { |
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111 | INIT, |
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112 | GPIO, |
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113 | CURRENT, |
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114 | TENSION, |
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115 | MARK |
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116 | } state; |
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117 | |
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118 | struct termios t, ot; |
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119 | |
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120 | prog = argv[0]; |
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121 | state = INIT; |
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122 | gpioi = currenti = tensioni = 0; |
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123 | |
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124 | while ((ch = getopt(argc, argv, "np:c:v:")) != -1) { |
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125 | switch (ch) { |
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126 | case 'n': |
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127 | nopt = 1; |
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128 | break; |
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129 | case 'c': |
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130 | c_opt = atoi(optarg); |
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131 | if (c_opt < 1 || c_opt > 4) |
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132 | usage(); |
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133 | current_r = current_ra[c_opt -1]; |
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134 | break; |
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135 | case 'v': |
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136 | v_opt = atoi(optarg); |
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137 | if (v_opt < 1 || v_opt > 3) |
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138 | usage(); |
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139 | break; |
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140 | default: |
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141 | usage(); |
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142 | } |
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143 | } |
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144 | argc -= optind; |
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145 | argv += optind; |
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146 | |
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147 | if (argc != 1 || c_opt == 0 || v_opt == 0) |
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148 | usage(); |
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149 | |
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150 | d = open(argv[0], O_RDWR | O_NOCTTY | O_NONBLOCK, 0); |
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151 | if (d < 0) { |
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152 | err(1, "open %s", argv[0]); |
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153 | } |
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154 | fprintf(stderr, "o\n"); |
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155 | |
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156 | if (tcgetattr(d, &ot) < 0) { |
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157 | err(1, "tcgetattr"); |
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158 | } |
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159 | fprintf(stderr, "tg\n"); |
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160 | |
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161 | quit = 0; |
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162 | |
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163 | if (signal(SIGINT, set_quit) == SIG_ERR) { |
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164 | err(1, "signal(SIGINT)"); |
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165 | } |
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166 | if (signal(SIGQUIT, set_quit) == SIG_ERR) { |
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167 | err(1, "signal(SIGQUIT)"); |
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168 | } |
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169 | if (signal(SIGPIPE, set_quit) == SIG_ERR) { |
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170 | err(1, "signal(SIGPIPE)"); |
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171 | } |
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172 | if (signal(SIGTERM, set_quit) == SIG_ERR) { |
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173 | err(1, "signal(SIGTERM)"); |
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174 | } |
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175 | |
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176 | t = ot; |
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177 | cfmakeraw(&t); |
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178 | t.c_cflag |= CLOCAL; |
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179 | t.c_cflag &= ~CRTSCTS; |
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180 | cfsetspeed(&t, B921600); |
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181 | |
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182 | if (tcsetattr(d, TCSANOW | TCSAFLUSH, &t) < 0) { |
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183 | err(1, "tcsetattr"); |
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184 | } |
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185 | fprintf(stderr, "tty ready\n"); |
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186 | do { |
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187 | write(d, "M0\n", 3); |
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188 | readline(d, buf, sizeof(buf)); |
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189 | if (quit) |
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190 | goto quit; |
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191 | } while (memcmp(buf, "OK", 2) != 0); |
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192 | write(d, "C\n", 2); |
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193 | readline(d, buf, sizeof(buf)); |
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194 | if (quit) |
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195 | goto quit; |
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196 | printf("cal_data: %s\n", buf); |
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197 | get_cal_data(buf, c_opt, v_opt); |
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198 | printf("cal_data selected: %f %f, %f %f\n", |
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199 | current_scale.read, current_scale.result, |
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200 | voltage_scale.read, voltage_scale.result); |
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201 | |
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202 | /* start measures */ |
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203 | write(d, "M1\n", 3); |
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204 | FD_ZERO(&rfds); |
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205 | while (quit == 0) { |
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206 | FD_SET(d, &rfds); |
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207 | nfds = select(d+1, &rfds, NULL, NULL, NULL); |
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208 | if (nfds > 0 && FD_ISSET(d, &rfds)) { |
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209 | bytes = read(d, buf, sizeof(buf)); |
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210 | if (bytes < 0 && errno != EAGAIN) { |
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211 | warn("read"); |
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212 | } |
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213 | for (i = 0; i < bytes; i++) { |
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214 | switch(state) { |
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215 | case INIT: |
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216 | /* look for an X mark */ |
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217 | if (buf[i] == 'X') { |
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218 | state = GPIO; |
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219 | gpioi = 0; |
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220 | } |
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221 | break; |
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222 | case GPIO: |
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223 | gpio[gpioi] = buf[i]; |
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224 | gpioi++; |
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225 | if (gpioi < 2) |
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226 | break; |
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227 | gpio[gpioi] = '\0'; |
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228 | gpio_val = strtol(gpio, &endp, 16); |
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229 | if (*endp != '\0') { |
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230 | fprintf(stderr, |
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231 | "gpio error: %c\n", |
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232 | *endp); |
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233 | state = INIT; |
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234 | } else { |
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235 | state = TENSION; |
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236 | tensioni = 0; |
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237 | } |
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238 | break; |
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239 | case CURRENT: |
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240 | current[currenti] = buf[i]; |
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241 | currenti++; |
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242 | if (currenti < 3) |
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243 | break; |
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244 | current[currenti] = '\0'; |
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245 | val = strtol(current, &endp, 16); |
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246 | if (*endp != '\0') { |
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247 | fprintf(stderr, |
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248 | "current error: %c\n", |
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249 | *endp); |
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250 | state = INIT; |
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251 | } else { |
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252 | if (val == 4095) { |
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253 | fprintf(stderr, |
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254 | "current saturation\n" |
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255 | ); |
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256 | } |
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257 | state = MARK; |
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258 | current_a = val / current_scale.read * current_scale.result; |
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259 | /* correct for in our resistor */ |
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260 | tension_v -= current_a * current_r; |
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261 | if (nopt) { |
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262 | printf("%8f ", (float)lineno / 5000); |
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263 | lineno++; |
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264 | } |
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265 | printf("%3d %8f %8f %8f\n", |
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266 | gpio_val, |
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267 | current_a, |
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268 | tension_v, |
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269 | current_a * tension_v); |
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270 | } |
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271 | break; |
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272 | case TENSION: |
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273 | tension[tensioni] = buf[i]; |
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274 | tensioni++; |
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275 | if (tensioni < 3) |
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276 | break; |
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277 | tension[tensioni] = '\0'; |
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278 | val = strtol(tension, &endp, 16); |
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279 | if (*endp != '\0') { |
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280 | fprintf(stderr, |
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281 | "tension error: %c\n", |
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282 | *endp); |
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283 | state = INIT; |
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284 | } else { |
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285 | if (val == 4095) { |
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286 | fprintf(stderr, |
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287 | "tension saturation\n" |
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288 | ); |
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289 | } |
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290 | state = CURRENT; |
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291 | currenti = 0; |
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292 | tension_v = val / voltage_scale.read * voltage_scale.result; |
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293 | } |
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294 | break; |
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295 | case MARK: |
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296 | if (buf[i] != 'X') { |
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297 | fprintf(stderr, |
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298 | "mark error: %c\n", |
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299 | buf[i]); |
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300 | state = INIT; |
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301 | } else { |
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302 | state = GPIO; |
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303 | gpioi = 0; |
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304 | } |
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305 | break; |
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306 | } |
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307 | } |
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308 | } else if (nfds < 0) { |
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309 | warn("select"); |
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310 | } |
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311 | } |
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312 | quit: |
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313 | /* stop measures */ |
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314 | write(d, "M0\n", 3); |
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315 | if (fflush(stdout) == EOF) { |
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316 | warn("fflush"); |
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317 | } |
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318 | if (tcsetattr(d, TCSANOW, &ot) < 0) { |
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319 | err(1, "restore tcsetattr"); |
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320 | } |
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321 | exit(0); |
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322 | } |
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