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/* -*- c++ -*- */
/*
* Copyright 2004,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_THRESHOLD_FF_H
#define INCLUDED_GR_THRESHOLD_FF_H
#include <blocks/api.h>
#include <gr_sync_block.h>
namespace gr {
namespace blocks {
/*!
* \brief Output a 1 or zero based on a threshold value.
* \ingroup misc_blk
*
* Test the incoming signal against a threshold. If the signal
* excedes the \p hi value, it will output a 1 until the signal
* falls below the \p lo value.
*/
class BLOCKS_API threshold_ff : virtual public gr_sync_block
{
public:
// gr::blocks::threshold_ff::sptr
typedef boost::shared_ptr<threshold_ff> sptr;
/* \brief Create a threadshold block.
* \param lo Threshold input signal needs to drop below to
* change state to 0.
* \param hi Threshold input signal needs to rise above to
* change state to 1.
* \param initial_state Initial state of the block (0 or 1).
*/
static sptr make(float lo, float hi, float initial_state=0);
virtual float lo () const = 0;
virtual void set_lo (float lo) = 0;
virtual float hi () const = 0;
virtual void set_hi (float hi) = 0;
virtual float last_state () const = 0;
virtual void set_last_state (float last_state) = 0;
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_GR_THRESHOLD_FF_H */
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