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usb bulk transfer

rj j

Hello Sir,

I am making a receipt printer for point of sale application using LPC2368 controller. I want to use USB interface for receiving data from computer to printer.I am using bulk transfer for data receiving and sending data. I started using Keil USB HID source code example and converted this source code for bulk transfer using following changes in configuration descriptor and few other changes

const UWORD8 USB_ConfigDescriptor[] = {
/* Configuration 1 */
  USB_CONFIGUARTION_DESC_SIZE,       /* bLength */
  USB_CONFIGURATION_DESCRIPTOR_TYPE, /* bDescriptorType */
  WBVAL(                             /* wTotalLength */
    1*USB_CONFIGUARTION_DESC_SIZE +
    1*USB_INTERFACE_DESC_SIZE     +
    2*USB_ENDPOINT_DESC_SIZE
  ),
  0x01,                              /* bNumInterfaces */
  0x01,                              /* bConfigurationValue */
  0x00,                              /* iConfiguration */
  USB_CONFIG_BUS_POWERED /*|*/       /* bmAttributes */
/*USB_CONFIG_REMOTE_WAKEUP*/,
  USB_CONFIG_POWER_MA(100),          /* bMaxPower */
/* Interface 0, Alternate Setting 0, MSC Class */
  USB_INTERFACE_DESC_SIZE,           /* bLength */
  USB_INTERFACE_DESCRIPTOR_TYPE,     /* bDescriptorType */
  0x00,                              /* bInterfaceNumber */
  0x00,                              /* bAlternateSetting */
  0x02,                              /* bNumEndpoints */
  USB_DEVICE_CLASS_PRINTER,          /* bInterfaceClass */
  0x01,                              /* bInterfaceSubClass */
  0x02,                             /* bInterfaceProtocol */
  0x62,                              /* iInterface */
/* Bulk In Endpoint */
  USB_ENDPOINT_DESC_SIZE,            /* bLength */
  USB_ENDPOINT_DESCRIPTOR_TYPE,      /* bDescriptorType */
  USB_ENDPOINT_IN(2),                /* bEndpointAddress */
  USB_ENDPOINT_TYPE_BULK,            /* bmAttributes */
  WBVAL(0x0040),                     /* wMaxPacketSize */
  0,                                 /* bInterval */
/* Bulk Out Endpoint */
  USB_ENDPOINT_DESC_SIZE,            /* bLength */
  USB_ENDPOINT_DESCRIPTOR_TYPE,      /* bDescriptorType */
  USB_ENDPOINT_OUT(2),               /* bEndpointAddress */
  USB_ENDPOINT_TYPE_BULK,            /* bmAttributes */
  WBVAL(0x0040),                     /* wMaxPacketSize */
  0,                                 /* bInterval */
/* Terminator */
  0                                  /* bLength */
};

Computer recognize my board usb device as a USB printing support successfully. I just want to know that is there is any class descriptor like HID class descriptor for printer or not?

And also I want to know that Is there is any host application to check bulk out transfer .

Thanks & Regards
Rohit

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