[Libusb-devel] error submitting URB: No such file or directory

[pauldamool <pau...@gm...>]

Hi !

I am trying to communicate with an usb device (NI GPIB-USB-B) to get some
physical measurements...
I find the device, but the function usb_bulk_write returns the following
error :

error submitting URB: No such file or directory

I am probably doing something wrong, and I spent lots of time to find my
mistake... Any help pointing out my error would be appreciated.



#################################################"

#include 
#include 
#include 
#include 
#include 

/*CONSTANTS*/
#define VENDOR_ID   0x3923
#define PRODUCT_ID  0x702B
#define EP_IN	0x82
#define EP_OUT	0x2
#define BULK_TIMEOUT 1000




//struct usb_dev_handle *usb_handle = NULL;
int verbose_mode = 0;

static struct usb_device *device_search(void)
{
	struct usb_bus *usb_bus;
	struct usb_device *dev;

	usb_init();
	usb_find_busses();
	usb_find_devices();

	for (usb_bus = usb_busses; usb_bus; usb_bus = usb_bus->next) {
		for (dev = usb_bus->devices; dev; dev = dev->next) {
			if ((dev->descriptor.idVendor == VENDOR_ID) && (dev->descriptor.idProduct
== PRODUCT_ID))
				return dev;
		}
	}
	return NULL;
}

int connectGPIB(){

  struct usb_device *usb_dev;
  usb_dev = device_search();

  int returnValue;

  if(usb_dev == NULL){
    fprintf(stderr, "Device not found\n");
    return -1;
  }

  usb_handle = usb_open(usb_dev);
  if(usb_handle == NULL){
    fprintf(stderr, "Cannot connect the device\n");
    return -1;
  }

    if (usb_handle) {

        returnValue = usb_set_configuration(usb_handle, 1);

        if (returnValue < 0) {	// Linux only
            returnValue = usb_detach_kernel_driver_np(usb_handle,0);
	    if (returnValue < 0) {
                fprintf(stderr, "Detach_kernel failed.\n");
                //return -1;
            }
            returnValue = usb_set_configuration(usb_handle, 1);
            if (returnValue < 0) {
                fprintf(stderr, "Set_configuration failed.\n");
                return -1;
            }
        }

        returnValue = usb_claim_interface(usb_handle, 0);
        if (returnValue < 0) {
            fprintf(stderr, "Claim_interface failed.\n");
            return -1;
        }
    }

  /*GPIB connection : OK*/

  return 1;
}

void disconnectGPIB(){
  if(usb_handle != NULL){
    usb_resetep(usb_handle, EP_IN);
    usb_release_interface(usb_handle, 0);
    usb_close(usb_handle);
}

}



/***********************************************/
//	MAIN
/***********************************************/

int main(void){

  int i;

  int returnValue = connectGPIB();

  if(returnValue < 0){
    fprintf(stderr, "Connexion : failed\n");
    return -1;
  }
  else{printf("Connexion : succeeded\n");}

  char dataInit[72] = "/0x09/0x1A/0x00/0x03/0x10/0x00/0x01/0x33";


  for(i=0;i<2;i++){
    returnValue = usb_bulk_write(usb_handle, EP_OUT , dataInit, 8,
BULK_TIMEOUT);
  }

  if(returnValue < 0){
    fprintf(stderr, "%s\n", usb_strerror());
  }
  disconnectGPIB();  

  return 1;
}

/***********************************************/
//	END MAIN
/***********************************************/



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