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

   1 #include <string.h>
   2 #include <stdio.h>
   3 #include <stdint.h>
   4 #include <usb.h>
   5 #include <arpa/inet.h>
   6
   7 #include "scope.h"
   8 #include "usbtmc.h"
   9
  10 #define USB_TIMEOUT 50000
  11
  12 #if BYTE_ORDER == LITTLE_ENDIAN
  13 #define LE32(x) x
  14 #elif BYTE_ORDER == BIG_ENDIAN
  15 #define LE32(x) ((uint32_t)((((uint32_t)x)>>24) | ((((uint32_t)x)>>8) & 0xff00) | ((((uint32_t)x)<<8) & 0xff0000) | (((uint32_t)x)<<24)))
  16 #else
  17 #error BYTE_ORDER not defined/known!
  18 #endif
  19
  20 //Helper-routine: Convert a little-endian 4-byte word to an int
  21 static void int2chars(unsigned char *buff,unsigned int a) {
  22         buff[3]=(a>>24)&0xff;
  23         buff[2]=(a>>16)&0xff;
  24         buff[1]=(a>>8)&0xff;
  25         buff[0]=(a)&0xff;
  26 }
  27
  28 //Helper-routine: Convert an int to  little-endian 4-byte word
  29 unsigned int chars2int(unsigned char *buff) {
  30         unsigned int a;
  31         a=buff[3]<<24;
  32         a+=buff[2]<<16;
  33         a+=buff[1]<<8;
  34         a+=buff[0];
  35         return a;
  36 }
  37
  38 //This routine locates a scope by VID/PID and returns an opened handle to it.
  39 static usb_dev_handle *usbtmc_find_scope() {
  40         struct usb_bus *bus;
  41         struct usb_device *dev=NULL;
  42         usb_find_busses();
  43         usb_find_devices();
  44         for (bus=usb_busses; bus; bus=bus->next) {
  45                 for (dev=bus->devices; dev; dev=dev->next) {
  46                         //fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
  47                         if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) {
  48                                 return usb_open(dev);
  49                         }
  50                 }
  51         }
  52         return NULL;
  53 }
  54
  55 //Send a scpi-command to the scope. The response goes into the buffer
  56 //called resp, with a size of resplen. If resp==NULL, no response
  57 //is requested.
  58 int usbtmc_sendscpi(struct scope *sc, char* cmd,
  59                 unsigned char *resp, int resplen) {
  60         unsigned char *buff;
  61         int len,r,i;
  62         int cmdlen = strlen(cmd);
  63         static unsigned char seq=0;
  64
  65
  66         buff=malloc(0x40);
  67         seq++;
  68         buff[0]=1; //func
  69         buff[1]=seq; buff[2]=~seq; //nseq
  70         buff[3]=0;
  71         int2chars(buff+4, cmdlen);
  72         buff[8]=1;
  73         buff[9]=0x00;
  74         buff[10]=0x00;
  75         buff[11]=0x00;
  76         //fprintf(stderr,"Writing header len=%d\n", cmdlen);
  77         //printb(buff,12);
  78         r=usb_bulk_write(sc->usb.dev, 1, (char*)buff, 12, USB_TIMEOUT);
  79         //fprintf(stderr,"%i bytes written. Writing cmd\n",r);
  80         //printb(cmd, cmdlen);
  81         r=usb_bulk_write(sc->usb.dev, 1, cmd, cmdlen, USB_TIMEOUT);
  82         //fprintf(stderr,"%i bytes written.\n",r);
  83         if (resp != NULL && resplen != 0) {
  84                 //send read command
  85                 buff[0]=2; //func
  86                 seq++;
  87                 buff[1]=seq; buff[2]=~seq; //nseq
  88                 int2chars(buff+4,0x40);
  89                 buff[8]=0;
  90                 buff[9]=0xA;
  91                 buff[10]=0;
  92                 buff[11]=0;
  93                 //fprintf(stderr,"Writing resp req header\n");
  94                 //printb(buff,12);
  95                 r=usb_bulk_write(sc->usb.dev, 1, (char*)buff, 12, USB_TIMEOUT);
  96                 //fprintf(stderr,"%i bytes written. Reading response hdr\n",r);
  97                 r=usb_bulk_read(sc->usb.dev, 2, (char*)buff, 0x40, USB_TIMEOUT);
  98                 //printb(buff,r);
  99                 len=chars2int(buff+4);
 100                 //fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len);
 101                 for (i=0; i<(r-12); i++) {
 102                         if (i<resplen) resp[i] = buff[i+12];
 103                 }
 104                 //printb(resp,r-12);
 105                 if (len > 0x40-12) {
 106                         //fprintf(stderr," Reading response:\n");
 107                         if (resplen<len) len=resplen;
 108                         r=usb_bulk_read(sc->usb.dev, 2, (char*)resp+(0x40-12), len-(0x40-12), USB_TIMEOUT);
 109                         //fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12));
 110                         return r+(0x40-12);
 111                 }
 112                 return len;
 113         }
 114         return 0;
 115 }
 116
 117 void usbtmc_claim(struct scope *sc)
 118 {
 119         usb_claim_interface(sc->usb.dev, 0);
 120 }
 121
 122 void usbtmc_release(struct scope *sc)
 123 {
 124         usb_release_interface(sc->usb.dev, 0);
 125 }
 126
 127 //Initialize the scope.
 128 struct scope* usbtmc_initscope(void) {
 129         int r;
 130         unsigned char buff[10];
 131         usb_dev_handle *dev;
 132         struct scope *sc;
 133
 134         //Init libusb
 135         usb_init();
 136         //Locate and open the scope
 137         dev = usbtmc_find_scope();
 138         if (!dev) {
 139                 return NULL;
 140         }
 141
 142         sc = calloc(1, sizeof(struct scope));
 143         if (sc == NULL) {
 144                 perror("calloc");
 145                 exit(EXIT_FAILURE);
 146         }
 147
 148         sc->usb.dev = dev;
 149
 150         usbtmc_claim(sc);
 151         //The following code isn't really necessary, the program works
 152         //OK without it too.
 153         r=usb_control_msg(sc->usb.dev, 0xC8, 9, 0, 0, (char*)buff, 4, USB_TIMEOUT);
 154         usbtmc_release(sc);
 155         if (r < 0) {
 156                 fprintf (stderr, "Error %d sending init message: %s\n",
 157                                 r, strerror (-r));
 158                 fprintf (stderr, "Do you have permission on the USB device?\n");
 159                 exit (1);
 160         }
 161         if (chars2int(buff)!=0x40005dc) {
 162                 fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff));
 163         }
 164         return sc;
 165 }
 166
 167 void usbtmc_close(struct scope *sc)
 168 {
 169         //Free up and exit
 170         usb_close(sc->usb.dev);
 171 }