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diff --git a/host/lib/usrp/usrp1/usrp1_iface.hpp b/host/lib/usrp/usrp1/usrp1_iface.hpp
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+//
+// Copyright 2010 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_USRP1_IFACE_HPP
+#define INCLUDED_USRP1_IFACE_HPP
+
+#include <uhd/types/serial.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/utility.hpp>
+#include "usrp1_ctrl.hpp"
+
+/*!
+ * The usrp1 interface class:
+ * Provides a set of functions to implementation layer.
+ * Including spi, peek, poke, control...
+ */
+class usrp1_iface : boost::noncopyable, public uhd::i2c_iface{
+public:
+    typedef boost::shared_ptr<usrp1_iface> sptr;
+
+    /*!
+     * Make a new usrp1 interface with the control transport.
+     * \param ctrl_transport the usrp controller object
+     * \return a new usrp1 interface object
+     */
+    static sptr make(usrp_ctrl::sptr ctrl_transport);
+
+    /*!
+     * Write a register (32 bits)
+     * \param addr the address
+     * \param data the 32bit data
+     */
+    virtual void poke32(boost::uint32_t addr, boost::uint32_t data) = 0;
+
+    /*!
+     * Read a register (32 bits)
+     * \param addr the address
+     * \return the 32bit data
+     */
+    virtual boost::uint32_t peek32(boost::uint32_t addr) = 0;
+
+    /*!
+     * Write a register (16 bits)
+     * \param addr the address
+     * \param data the 16bit data
+     */
+    virtual void poke16(boost::uint32_t addr, boost::uint16_t data) = 0;
+
+    /*!
+     * read a register (16 bits)
+     * \param addr the address
+     * \return the 16bit data
+     */
+    virtual boost::uint16_t peek16(boost::uint32_t addr) = 0;
+
+    /*!
+     * Perform an spi transaction.
+     * \param which_slave the slave device number
+     * \param config spi config args
+     * \param data the bits to write
+     * \param num_bits how many bits in data
+     * \param readback true to readback a value
+     * \return spi data if readback set
+     */
+    virtual boost::uint32_t transact_spi(int which_slave,
+                                         const uhd::spi_config_t &config,
+                                         boost::uint32_t data,
+                                         size_t num_bits,
+                                         bool readback) = 0;
+
+    /*!
+     * Perform a general USB firmware OUT operation
+     * \param request 
+     * \param value
+     * \param index 
+     * \param data 
+     * \return 
+     */
+    virtual void write_firmware_cmd(boost::uint8_t request,
+                                   boost::uint16_t value,
+                                   boost::uint16_t index,
+                                   unsigned char* buff,
+                                   boost::uint16_t length) = 0;
+};
+
+#endif /* INCLUDED_USRP1_IFACE_HPP */