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 <fcntl.h>
  17 #include <unistd.h>
  18
  19 #include <readline/readline.h>
  20 #include <readline/history.h>
  21
  22
  23 //This routine locates a scope by VID/PID and returns an opened handle to it.
  24 usb_dev_handle *find_scope() {
  25     struct usb_bus *bus;
  26     struct usb_device *dev=NULL;
  27     usb_find_busses();
  28     usb_find_devices();
  29     for (bus=usb_busses; bus; bus=bus->next) {
  30         for (dev=bus->devices; dev; dev=dev->next) {
  31 //          fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
  32             if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) {
  33                 return usb_open(dev);
  34             }
  35         }
  36     }
  37     return NULL;
  38 }
  39
  40 //Helper-routine: Convert a little-endian 4-byte word to an int
  41 void int2chars(unsigned char *buff,unsigned int a) {
  42     buff[3]=(a>>24)&0xff;
  43     buff[2]=(a>>16)&0xff;
  44     buff[1]=(a>>8)&0xff;
  45     buff[0]=(a)&0xff;
  46 }
  47
  48 //Helper-routine: Convert an int to  little-endian 4-byte word
  49 unsigned int chars2int(unsigned char *buff) {
  50     unsigned int a;
  51     a=buff[3]<<24;
  52     a+=buff[2]<<16;
  53     a+=buff[1]<<8;
  54     a+=buff[0];
  55     return a;
  56 }
  57
  58 #define MIN(a,b) (((a)<(b))?(a):(b))
  59
  60 inline char printable (char ch)
  61 {
  62   if (ch < ' ') return '.';
  63   if (ch > '~') return '.';
  64   return ch;
  65 }
  66
  67 //Debugging: Print a buffers contents in hex
  68 void printb (unsigned char *pkt, int len)
  69 {
  70   int i, j;
  71
  72   for (i=0;i<len;i+= 16) {
  73     printf ("%04x:  ", i);
  74     for (j=0;j < MIN(len-i, 16);j++) {
  75       printf (" %02x", pkt[i+j]);
  76       if (j == 7) printf ("  ");
  77     }
  78     if (j < 7) printf ("  ");
  79     for (;j<17;j++)
  80       printf ("   ");
  81
  82     for (j=0;j < MIN(len-i, 16);j++) {
  83       printf ("%c", printable (pkt[i+j]));
  84     }
  85     printf ("\n");
  86   }
  87 }
  88
  89 //Send a scpi-command to the scope. The response goes into the buffer
  90 //called resp, with a size of resplen. If resp==NULL, no response
  91 //is requested.
  92 int sendscpi(usb_dev_handle *dev, char* cmd,
  93              unsigned char *resp, int resplen) {
  94     unsigned char *buff;
  95     int len,r,i;
  96     int cmdlen = strlen(cmd);
  97     static unsigned char seq=0;
  98
  99
 100     buff=malloc(0x40);
 101     seq++;
 102     buff[0]=1; //func
 103     buff[1]=seq; buff[2]=~seq; //nseq
 104     buff[3]=0;
 105     int2chars(buff+4, cmdlen);
 106     buff[8]=1;
 107     buff[9]=0x37;
 108     buff[10]=0x39;
 109     buff[11]=0x39;
 110     //    fprintf(stderr,"Writing header len=%d\n", cmdlen);
 111 //    printb(buff,12);
 112     r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
 113 //    fprintf(stderr,"%i bytes written. Writing cmd\n",r);
 114 //    printb(cmd, cmdlen);
 115     r=usb_bulk_write(dev, 1, cmd, cmdlen, 1000);
 116 //    fprintf(stderr,"%i bytes written.\n",r);
 117     if (resp != NULL && resplen != 0) {
 118         //send read command
 119         buff[0]=2; //func
 120         seq++;
 121         buff[1]=seq; buff[2]=~seq; //nseq
 122         int2chars(buff+4,0x40);
 123         buff[8]=1;
 124         buff[9]=0xA;
 125         buff[10]=0;
 126         buff[11]=0;
 127 //      fprintf(stderr,"Writing resp req header\n");
 128 //      printb(buff,12);
 129         r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
 130 //      fprintf(stderr,"%i bytes written. Reading response hdr\n",r);
 131         r=usb_bulk_read(dev, 2, (char*)buff, 0x40, 1000);
 132 //      printb(buff,r);
 133         len=chars2int(buff+4);
 134         //      fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len);
 135         for (i=0; i<(r-12); i++) {
 136             if (i<resplen) resp[i] = buff[i+12];
 137         }
 138 //      printb(resp,r-12);
 139         if (len > 0x40-12) {
 140 //          fprintf(stderr," Reading response:\n");
 141             if (resplen<len) len=resplen;
 142             r=usb_bulk_read(dev, 2, (char*)resp+(0x40-12), len-(0x40-12),1000);
 143             //      fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12));
 144             return r+(0x40-12);
 145         }
 146         return len;
 147     }
 148     return 0;
 149 }
 150
 151 //Initialize the scope.
 152 void initscope(usb_dev_handle *dev) {
 153     int r;
 154     unsigned char buff[10];
 155     usb_claim_interface(dev,0);
 156     //The following code isn't really necessary, the program works
 157     //OK without it too.
 158     r=usb_control_msg(dev, 0xC8, 9, 0, 0, (char*)buff, 4, 1000);
 159     if (r < 0) {
 160         fprintf (stderr, "Error %d sending init message: %s\n",
 161                 r, strerror (-r));
 162         fprintf (stderr, "Do you have permission on the USB device?\n");
 163         exit (1);
 164     }
 165     if (chars2int(buff)!=0x40004dc) {
 166         fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff));
 167     }
 168     return;
 169 }
 170
 171 #define HAVE_READLINE
 172 #ifndef HAVE_READLINE
 173
 174 char *readline (prompt)
 175 {
 176   char *buf;
 177
 178   printf (prompt);
 179   fflush (stdout);
 180   buf = malloc (1024);
 181
 182   if (fgets (buf, 1023, stdin) == NULL) {
 183     free (buf);
 184     return NULL;
 185   }
 186   l = strlen (buf);
 187   if (buf[l-1] == '\n') {
 188     buf[l] = 0;
 189   }
 190   return buf;
 191 }
 192
 193 void add_history (char *buf)
 194 {
 195 }
 196 #endif
 197
 198
 199 void do_plot (struct usb_dev_handle *sc)
 200 {
 201   unsigned char ch1[1024], ch2[1024];
 202   int i, l;
 203
 204   static FILE *gnuplot=NULL;
 205   FILE *fp;
 206
 207   l = sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
 208
 209   if (l != 1024) {
 210     printf ("hmm. didnt' get 1024 bytes. \n");
 211   }
 212
 213   l = sendscpi(sc, ":WAV:DATA? CHANNEL2", ch2, 1024);
 214
 215   if (l != 1024) {
 216     printf ("hmm. didnt' get 1024 bytes. \n");
 217   }
 218
 219   if (!gnuplot) {
 220     gnuplot = popen ("gnuplot", "w");
 221   }
 222
 223   fp = fopen ("temp.dat", "w");
 224   for (i=0xd4;i<0x32c;i++)
 225     //  for (i=0;i<0x400;i++)
 226     fprintf (fp, "%d %d\n", 255 - ch1[i], 255 - ch2[i]);
 227   fclose (fp);
 228
 229   fprintf (gnuplot, "plot 'temp.dat' using 1 with lines, 'temp.dat' using 2 with lines\n");
 230   fflush (gnuplot);
 231 }
 232
 233
 234 #define ERROR -1e100
 235
 236 double get_float_from_scope (struct usb_dev_handle *sc, char *var)
 237 {
 238   unsigned char buf[1024];
 239   double temp;
 240   int l;
 241
 242   l = sendscpi(sc, var, buf, 1024);
 243   if (l > 0) {
 244     sscanf ((char*)buf, "%lf", &temp);
 245     return temp;
 246   }
 247   return ERROR;
 248 }
 249
 250
 251 void do_get_buf (struct usb_dev_handle *sc)
 252 {
 253   FILE *fp;
 254   int i, j, l, bp;
 255   char buf[1024];
 256   unsigned char ch1[1024];
 257   unsigned char data[512*1024];
 258   double sampfreq;
 259
 260   sendscpi (sc, ":STOP", NULL, 0);
 261
 262   sampfreq = get_float_from_scope (sc, ":ACQ:SAMP?");
 263
 264   printf ("Got sampling freq: %g\n", sampfreq);
 265
 266   sprintf (buf, ":TIM:SCAL %.15f", 50 / sampfreq);
 267   printf ("sending scale cmd: %s\n", buf);
 268   sendscpi (sc, buf, NULL, 0);
 269
 270   sleep (1);
 271
 272   bp=0;
 273   for (i=-254*1024;i< 254*1024;i += 600) {
 274     sprintf (buf, ":TIM:OFFSET %.15f", i / sampfreq);
 275     printf ("Sending offset cmd:  %s\n", buf);
 276     sendscpi (sc, buf, NULL, 0);
 277
 278     l = sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
 279
 280     if (l != 1024) {
 281       printf ("hmm. didnt' get 1024 bytes. \n");
 282     }
 283
 284     for (j=0;j<600;j++)
 285       data[bp++] = ch1[j+0xd4];
 286   }
 287   printf ("Got %d bytes of data. \n", bp);
 288
 289   fp = fopen ("ch1.dump", "w");
 290   fwrite (data, bp, 1, fp);
 291   fclose (fp);
 292
 293   sendscpi (sc, ":TIM:OFFSET 0", NULL, 0);
 294 }
 295
 296
 297
 298 int main(int argc, char **argv)
 299 {
 300   struct usb_dev_handle *sc;
 301   char *scpi;
 302   unsigned char *buff;
 303   int l;
 304   //Init libusb
 305   usb_init();
 306   //Locate and open the scope
 307   sc=find_scope();
 308   if (!sc) {
 309     printf("No scope found.\n");
 310     exit(1);
 311   } else {
 312     printf("Scope found.\n");
 313   }
 314   //Initialize scope
 315   initscope(sc);
 316   buff = malloc (1024*1024);
 317   while (1) {
 318     scpi = readline ("> ");
 319
 320     if (!scpi) break;
 321     if (strlen (scpi) == 0) {
 322       free (scpi);
 323       continue;
 324     }
 325
 326     add_history (scpi);
 327
 328     if (strncmp (scpi, "quit", 4) == 0) break;
 329     if (strncmp (scpi, "plot", 4) == 0) {
 330       do_plot (sc);
 331       continue;
 332     }
 333     if (strncmp (scpi, "databuf", 4) == 0) {
 334       do_get_buf (sc);
 335       continue;
 336     }
 337
 338     l = strlen (scpi);
 339     //       printf ("got buf(%d): ", l);
 340     //       printb (scpi, l+2);
 341     if (strchr (scpi, '?')) {
 342       //        printf ("Expecting reply\n");
 343       l = sendscpi(sc, scpi, buff, 1024*1024);
 344       //          printf ("Got replylen = %d.\n", l);
 345       buff[l] = 0; //zero-terminate
 346       printb (buff, l);
 347     } else {
 348       //        printf ("No reply expected\n");
 349       l=sendscpi(sc,scpi,NULL,0);
 350     }
 351     free (scpi);
 352   }
 353   //Disable keylock, so the user doesn't have to press the 'force'-button
 354   l=sendscpi(sc, ":KEY:LOCK DISABLE",NULL,0);
 355
 356   //Free up and exit
 357   usb_release_interface(sc,0);
 358   usb_close(sc);
 359   return 0;
 360 }