git.zerfleddert.de Git - rigol/blob - rigol.c

   1 /*
   2 Sprite_tms hack to communicate with a Rigol DS1000-series scope using Linux.
   3 This code is licensed under the GPL V3.
   4
   5 Warning: This code can in theory fubar the communications with the scope to a
   6 point where the Linux USB-stack seems to get confused. Do a
   7 rmmod uhci_hcd; modprobe uhci_hcd
   8 (or alternately: use ohci_hcd) if that happens and you should be fine.
   9  */
  10
  11 #include <usb.h>
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <fcntl.h>
  19 #include <unistd.h>
  20 #include <signal.h>
  21 #include <time.h>
  22
  23 #include <readline/readline.h>
  24 #include <readline/history.h>
  25
  26 #include "usbtmc.h"
  27 #include "png.h"
  28
  29
  30 #define MIN(a,b) (((a)<(b))?(a):(b))
  31
  32 inline char printable (char ch)
  33 {
  34         if (ch < ' ') return '.';
  35         if (ch > '~') return '.';
  36         return ch;
  37 }
  38
  39 //Debugging: Print a buffers contents in hex
  40 void printb (unsigned char *pkt, int len)
  41 {
  42         int i, j;
  43
  44         for (i=0;i<len;i+= 16) {
  45                 printf ("%04x:  ", i);
  46                 for (j=0;j < MIN(len-i, 16);j++) {
  47                         printf (" %02x", pkt[i+j]);
  48                         if (j == 7) printf ("  ");
  49                 }
  50                 if (j < 7) printf ("  ");
  51                 for (;j<17;j++)
  52                         printf ("   ");
  53
  54                 for (j=0;j < MIN(len-i, 16);j++) {
  55                         printf ("%c", printable (pkt[i+j]));
  56                 }
  57                 printf ("\n");
  58         }
  59 }
  60
  61 #define HAVE_READLINE
  62 #ifndef HAVE_READLINE
  63
  64 char *readline (prompt)
  65 {
  66         char *buf;
  67
  68         printf (prompt);
  69         fflush (stdout);
  70         buf = malloc (1024);
  71
  72         if (fgets (buf, 1023, stdin) == NULL) {
  73                 free (buf);
  74                 return NULL;
  75         }
  76         l = strlen (buf);
  77         if (buf[l-1] == '\n') {
  78                 buf[l] = 0;
  79         }
  80         return buf;
  81 }
  82
  83 void add_history (char *buf)
  84 {
  85 }
  86 #endif
  87
  88
  89 void do_plot (struct usb_dev_handle *sc)
  90 {
  91         unsigned char ch1[1024], ch2[1024];
  92         int i, l;
  93
  94         static FILE *gnuplot=NULL;
  95         FILE *fp;
  96
  97         l = usbtmc_sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
  98
  99         if (l != 1024) {
 100                 printf ("hmm. didnt' get 1024 bytes. \n");
 101         }
 102
 103         l = usbtmc_sendscpi(sc, ":WAV:DATA? CHANNEL2", ch2, 1024);
 104
 105         if (l != 1024) {
 106                 printf ("hmm. didnt' get 1024 bytes. \n");
 107         }
 108
 109         if (!gnuplot) {
 110                 gnuplot = popen ("gnuplot", "w");
 111         }
 112
 113         fp = fopen ("temp.dat", "w");
 114         for (i=0xd4;i<0x32c;i++)
 115                 //for (i=0;i<0x400;i++)
 116                 fprintf (fp, "%d %d\n", 255 - ch1[i], 255 - ch2[i]);
 117         fclose (fp);
 118
 119         fprintf (gnuplot, "plot 'temp.dat' using 1 with lines, 'temp.dat' using 2 with lines\n");
 120         fflush (gnuplot);
 121 }
 122
 123
 124 #define ERROR -1e100
 125
 126 double get_float_from_scope (struct usb_dev_handle *sc, char *var)
 127 {
 128         unsigned char buf[1024];
 129         double temp;
 130         int l;
 131
 132         l = usbtmc_sendscpi(sc, var, buf, 1024);
 133         if (l > 0) {
 134                 sscanf ((char*)buf, "%lf", &temp);
 135                 return temp;
 136         }
 137         return ERROR;
 138 }
 139
 140
 141 void do_get_buf (struct usb_dev_handle *sc)
 142 {
 143         FILE *fp;
 144         int i, j, l, bp;
 145         char buf[1024];
 146         unsigned char ch1[1024];
 147         unsigned char data[512*1024];
 148         double sampfreq;
 149
 150         usbtmc_sendscpi (sc, ":STOP", NULL, 0);
 151
 152         sampfreq = get_float_from_scope (sc, ":ACQ:SAMP?");
 153
 154         printf ("Got sampling freq: %g\n", sampfreq);
 155
 156         sprintf (buf, ":TIM:SCAL %.15f", 50 / sampfreq);
 157         printf ("sending scale cmd: %s\n", buf);
 158         usbtmc_sendscpi (sc, buf, NULL, 0);
 159
 160         sleep (1);
 161
 162         bp=0;
 163         for (i=-254*1024;i< 254*1024;i += 600) {
 164                 sprintf (buf, ":TIM:OFFSET %.15f", i / sampfreq);
 165                 printf ("Sending offset cmd:  %s\n", buf);
 166                 usbtmc_sendscpi (sc, buf, NULL, 0);
 167
 168                 l = usbtmc_sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
 169
 170                 if (l != 1024) {
 171                         printf ("hmm. didnt' get 1024 bytes. \n");
 172                 }
 173
 174                 for (j=0;j<600;j++)
 175                         data[bp++] = ch1[j+0xd4];
 176         }
 177         printf ("Got %d bytes of data. \n", bp);
 178
 179         fp = fopen ("ch1.dump", "w");
 180         fwrite (data, bp, 1, fp);
 181         fclose (fp);
 182
 183         usbtmc_sendscpi (sc, ":TIM:OFFSET 0", NULL, 0);
 184 }
 185
 186 void do_get_screen(struct usb_dev_handle *sc)
 187 {
 188         unsigned char screen[320*234];
 189         time_t lt;
 190         char filename[256];
 191         unsigned char *png;
 192         int imglen;
 193         int ret;
 194         int l;
 195         int fd;
 196         pid_t display;
 197
 198         /* Hide "RMT" from screen */
 199         l = usbtmc_sendscpi(sc, ":KEY:LOCK DISABLE", NULL, 0);
 200         usleep(20000);
 201
 202         l = usbtmc_sendscpi(sc, ":LCD:DATA?", screen, sizeof(screen));
 203
 204         if (l != sizeof(screen)) {
 205                 printf ("hmm. didnt' get %d bytes, but %d\n\n", sizeof(screen), l);
 206         }
 207
 208         png = lcd2png(screen, &imglen);
 209
 210         lt = time(NULL);
 211         strftime(filename, sizeof(filename), "screen_%Y%m%d-%H%M%S.png", localtime(&lt));
 212         fd=open(filename, O_CREAT|O_WRONLY, 0644);
 213         if (fd == -1) {
 214                 perror("open");
 215                 exit(EXIT_FAILURE);
 216         }
 217
 218         while(imglen > 0) {
 219                 ret = write(fd, png, imglen);
 220                 if (ret == -1) {
 221                         perror("write");
 222                         exit(EXIT_FAILURE);
 223                 }
 224                 imglen -= ret;
 225         }
 226         close(fd);
 227         free(png);
 228
 229         printf("Waveform saved as %s\n", filename);
 230
 231         display = fork();
 232         switch(display) {
 233                 case 0:
 234                         execlp("display", "display", filename, NULL);
 235                         exit(0);
 236                         break;
 237                 case -1:
 238                         perror("fork");
 239                         break;
 240                 default:
 241                         break;
 242         }
 243 }
 244
 245 void child_reaper(int sig)
 246 {
 247         pid_t child;
 248
 249         do {
 250                 child = waitpid(-1, NULL, WNOHANG);
 251         } while(child > 0);
 252
 253 }
 254
 255 int main(int argc, char **argv)
 256 {
 257         struct usb_dev_handle *sc;
 258         char *scpi;
 259         unsigned char *buff;
 260         int l;
 261         struct sigaction act;
 262
 263         //Initialize scope
 264         sc = usbtmc_initscope();
 265         buff = malloc (1024*1024);
 266         if (buff == NULL) {
 267                 perror("malloc");
 268                 exit(EXIT_FAILURE);
 269         }
 270
 271         bzero(&act, sizeof(act));
 272         act.sa_handler = child_reaper;
 273         act.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 274         if (sigaction(SIGCHLD, &act, NULL) == -1) {
 275                 perror("sigaction");
 276                 exit(EXIT_FAILURE);
 277         }
 278
 279         while (1) {
 280                 scpi = readline ("> ");
 281
 282                 if (!scpi) break;
 283                 if (strlen (scpi) == 0) {
 284                         free (scpi);
 285                         continue;
 286                 }
 287
 288                 add_history (scpi);
 289
 290                 if (strncmp (scpi, "quit", 4) == 0) break;
 291                 if (strncmp (scpi, "plot", 4) == 0) {
 292                         do_plot (sc);
 293                         continue;
 294                 }
 295                 if (strncmp (scpi, "databuf", 7) == 0) {
 296                         do_get_buf (sc);
 297                         continue;
 298                 }
 299                 if (strncmp (scpi, "screen", 6) == 0) {
 300                         do_get_screen (sc);
 301                         continue;
 302                 }
 303
 304                 l = strlen (scpi);
 305                 //printf ("got buf(%d): ", l);
 306                 //printb (scpi, l+2);
 307                 if (strchr (scpi, '?')) {
 308                         //printf ("Expecting reply\n");
 309                         l = usbtmc_sendscpi(sc, scpi, buff, 1024*1024);
 310                         //printf ("Got replylen = %d.\n", l);
 311                         buff[l] = 0; //zero-terminate
 312                         printb (buff, l);
 313                 } else {
 314                         //printf ("No reply expected\n");
 315                         l=usbtmc_sendscpi(sc,scpi,NULL,0);
 316                 }
 317                 free (scpi);
 318         }
 319         //Disable keylock, so the user doesn't have to press the 'force'-button
 320         l=usbtmc_sendscpi(sc, ":KEY:LOCK DISABLE",NULL,0);
 321
 322         //Free up and exit
 323         usb_release_interface(sc,0);
 324         usb_close(sc);
 325         return 0;
 326 }