cvs.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 }