USRP Hardware Driver and USRP Manual: uhd::transport::usb_zero_copy Class Reference

| USRP Hardware Driver and USRP Manual Version: 4.9.0.makepkg-0-g9ec1f582 UHD and USRP Manual |

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uhd::transport::usb_zero_copy Class Reference

`#include <uhd/transport/usb_zero_copy.hpp>`

Inheritance diagram for uhd::transport::usb_zero_copy:

## Public Types
typedef std::shared_ptr< usb_zero_copy > | sptr
Public Types inherited from uhd::transport::zero_copy_if
typedef std::shared_ptr< zero_copy_if > | sptr

## Public Member Functions
| ~usb_zero_copy (void) override
Public Member Functions inherited from uhd::transport::zero_copy_if
virtual | ~zero_copy_if ()
virtual managed_recv_buffer::sptr | get_recv_buff (double timeout=0.1)=0
virtual size_t | get_num_recv_frames (void) const =0
virtual size_t | get_recv_frame_size (void) const =0
virtual managed_send_buffer::sptr | get_send_buff (double timeout=0.1)=0
virtual size_t | get_num_send_frames (void) const =0
virtual size_t | get_send_frame_size (void) const =0

## Static Public Member Functions
static sptr | make (usb_device_handle::sptr handle, const int recv_interface, const unsigned char recv_endpoint, const int send_interface, const unsigned char send_endpoint, const device_addr_t &hints=device_addr_t())

## Detailed Description

A zero copy USB transport provides an efficient way to handle data. by avoiding the extra copy when recv() or send() is called on the handle. Rather, the zero copy transport gives the caller memory references. The caller informs the transport when it is finished with the reference.

On Linux systems, the zero copy transport can use a kernel packet ring. If no platform specific solution is available, make returns a boost asio implementation that wraps functionality around standard send/recv calls.

## Member Typedef Documentation

## ◆ sptr

typedef std::shared_ptr<usb_zero_copy> uhd::transport::usb_zero_copy::sptr

## Constructor & Destructor Documentation

## ◆ ~usb_zero_copy()

uhd::transport::usb_zero_copy::~usb_zero_copy | ( | void |  | ) |
| override

## Member Function Documentation

## ◆ make()

sptr uhd::transport::usb_zero_copy::make | ( | usb_device_handle::sptr | handle,
|  | const int | recv_interface,
|  | const unsigned char | recv_endpoint,
|  | const int | send_interface,
|  | const unsigned char | send_endpoint,
|  | const device_addr_t & | hints = device_addr_t() )
| static

Make a new zero copy USB transport: This transport is for sending and receiving between the host and a pair of USB bulk transfer endpoints. The primary usage for this transport is data transactions. The underlying implementation may be platform specific.

Parameters

  handle | a device handle that uniquely identifying the device
  recv_interface | an integer specifying an IN interface number
  recv_endpoint | an integer specifying an IN endpoint number
  send_interface | an integer specifying an OUT interface number
  send_endpoint | an integer specifying an OUT endpoint number
  hints | optional parameters to pass to the underlying transport

Returns
  a new zero copy USB object

The documentation for this class was generated from the following file:

- usb_zero_copy.hpp