cvs.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 #define USB_ERROR(x) do { if (x < 0) { fprintf(stderr, "usb: %s\n", usb_strerror()); exit(EXIT_FAILURE); } } while(0)
  21
  22 /* This routine locates a scope by VID/PID and returns a struct scope* for it */
  23 static struct scope* usbtmc_find_scope() {
  24         struct usb_bus *bus;
  25         struct usb_device *dev=NULL;
  26         struct usb_dev_handle *devh;
  27
  28         struct scope *sc;
  29
  30         usb_find_busses();
  31         usb_find_devices();
  32
  33         for (bus=usb_busses; bus; bus=bus->next) {
  34                 for (dev=bus->devices; dev; dev=dev->next) {
  35                         if (dev->descriptor.idVendor == 0x400 && dev->descriptor.idProduct == 0x5dc) {
  36                                 devh = usb_open(dev);
  37                                 if (devh == NULL)
  38                                         return NULL;
  39
  40                                 sc = calloc(1, sizeof(struct scope));
  41                                 if (sc == NULL) {
  42                                         perror("calloc");
  43                                         exit(EXIT_FAILURE);
  44                                 }
  45
  46                                 sc->usb.dev = devh;
  47
  48                                 /* TODO: FIXME */
  49                                 sc->usb.brokenRigol = 1;
  50                                 sc->usb.ep_bulk_out = 1;
  51                                 sc->usb.ep_bulk_in = 2;
  52                                 sc->usb.wMaxPacketSize_in = 0x40;
  53
  54                                 return sc;
  55                         }
  56                 }
  57         }
  58
  59         return NULL;
  60 }
  61
  62 /*
  63  * Send a scpi-command to the scope. The response goes into the buffer
  64  * called resp, with a size of resplen. If resp==NULL, no response
  65  * is requested.
  66  */
  67 int usbtmc_sendscpi(struct scope *sc, char* cmd,
  68                 unsigned char *resp, int resplen) {
  69         int len,r;
  70         int cmdlen = strlen(cmd);
  71         struct usbtmc_header *req;
  72
  73         sc->usb.bTag++;
  74
  75         len = sizeof(struct usbtmc_header) + cmdlen;
  76         if (len%4)
  77                 len += 4 - (len%4);
  78
  79         req = calloc(1, len);
  80         if (req == NULL) {
  81                 perror("calloc");
  82                 exit(EXIT_FAILURE);
  83         }
  84
  85         req->MsgID = USBTMC_DEV_DEP_MSG_OUT;
  86         req->bTag = sc->usb.bTag;
  87         req->bTagInverse = ~sc->usb.bTag;
  88         req->TransferSize = LE32(cmdlen);
  89         req->bmTransferAttributes = USBTMC_TRANSFERATTRIB_EOM;
  90         memcpy(req->msg, cmd, cmdlen);
  91
  92         if (sc->usb.brokenRigol) {
  93                 r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
  94                         (char*)req, sizeof(struct usbtmc_header),
  95                         USB_TIMEOUT);
  96                 USB_ERROR(r);
  97
  98                 r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
  99                         (char*)&(req->msg), len - sizeof(struct usbtmc_header),
 100                         USB_TIMEOUT);
 101                 USB_ERROR(r);
 102         } else {
 103                 r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
 104                         (char*)req, len, USB_TIMEOUT);
 105                 USB_ERROR(r);
 106         }
 107
 108         free(req);
 109
 110         if (resp != NULL && resplen != 0) {
 111                 unsigned char *buff;
 112                 struct usbtmc_header *res;
 113                 int bytes_read;
 114
 115                 sc->usb.bTag++;
 116
 117                 req = calloc(1, sizeof(struct usbtmc_header));
 118                 if (req == NULL) {
 119                         perror("calloc");
 120                         exit(EXIT_FAILURE);
 121                 }
 122
 123                 req->MsgID = USBTMC_REQUEST_DEV_DEP_MSG_IN;
 124                 req->bTag = sc->usb.bTag;
 125                 req->bTagInverse = ~sc->usb.bTag;
 126                 req->TransferSize = LE32(sc->usb.wMaxPacketSize_in);
 127                 req->bmTransferAttributes = 0;
 128                 req->TermChar = 0;
 129
 130                 /* send read command */
 131                 r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
 132                         (char*)req, sizeof(struct usbtmc_header), USB_TIMEOUT);
 133                 USB_ERROR(r);
 134
 135                 free(req);
 136
 137                 buff=malloc(sc->usb.wMaxPacketSize_in);
 138                 if (buff == NULL) {
 139                         perror("malloc");
 140                         exit(EXIT_FAILURE);
 141                 }
 142
 143                 r=usb_bulk_read(sc->usb.dev, sc->usb.ep_bulk_in,
 144                         (char*)buff, sc->usb.wMaxPacketSize_in, USB_TIMEOUT);
 145                 USB_ERROR(r);
 146
 147                 if (r < sizeof(struct usbtmc_header)) {
 148                         fprintf(stderr, "Short read!\n");
 149                         return 0;
 150                 }
 151
 152                 bytes_read = r - sizeof(struct usbtmc_header);
 153
 154                 res = (struct usbtmc_header*)buff;
 155                 len = LE32(res->TransferSize);
 156
 157                 memmove(buff, buff + sizeof(struct usbtmc_header), bytes_read);
 158
 159                 buff = realloc(buff, len);
 160                 if (buff == NULL) {
 161                         perror("realloc");
 162                         exit(EXIT_FAILURE);
 163                 }
 164
 165                 while ((len - bytes_read) > 0) {
 166                         r=usb_bulk_read(sc->usb.dev, sc->usb.ep_bulk_in,
 167                                 (char*)buff + bytes_read, len - bytes_read,
 168                                 USB_TIMEOUT);
 169                         USB_ERROR(r);
 170
 171                         bytes_read += r;
 172                 }
 173
 174                 /* TODO: FIXME */
 175                 if (bytes_read > resplen) {
 176                         fprintf(stderr, "Response buffer to small: %d instead of %d bytes!\n",
 177                                 resplen, bytes_read);
 178                         bytes_read = resplen;
 179                 }
 180
 181                 memcpy(resp, buff, bytes_read);
 182                 free(buff);
 183
 184                 return bytes_read;
 185         }
 186         return 0;
 187 }
 188
 189 void usbtmc_claim(struct scope *sc)
 190 {
 191         usb_claim_interface(sc->usb.dev, 0);
 192 }
 193
 194 void usbtmc_release(struct scope *sc)
 195 {
 196         usb_release_interface(sc->usb.dev, 0);
 197 }
 198
 199 //Initialize the scope.
 200 struct scope* usbtmc_initscope(void) {
 201         int r;
 202         unsigned char buff[10];
 203         struct scope *sc;
 204
 205         /* Init libusb */
 206         usb_init();
 207         /* Locate and open the scope */
 208         sc = usbtmc_find_scope();
 209         if (!sc) {
 210                 return NULL;
 211         }
 212
 213         usbtmc_claim(sc);
 214         /* The following code isn't really necessary, the program works
 215            OK without it too. */
 216         r=usb_control_msg(sc->usb.dev, 0xC8, 9, 0, 0, (char*)buff, 4, USB_TIMEOUT);
 217         usbtmc_release(sc);
 218         if (r < 0) {
 219                 fprintf (stderr, "Error %d sending init message: %s\n",
 220                                 r, strerror (-r));
 221                 fprintf (stderr, "Do you have permission on the USB device?\n");
 222                 exit (1);
 223         }
 224         if (LE32((*(uint32_t*)buff))!=0x40005dc) {
 225                 fprintf(stderr,"Init: buff[%i]=%x\n",r,LE32((*(uint32_t*)buff)));
 226         }
 227         return sc;
 228 }
 229
 230 void usbtmc_close(struct scope *sc)
 231 {
 232         /* Free up and exit */
 233         usb_close(sc->usb.dev);
 234 }