root / gr-howto-write-a-block-cmake / lib / howto_square2_ff.cc @ 626018eb
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| 1 | /* -*- c++ -*- */
|
|---|---|
| 2 | /*
|
| 3 | * Copyright 2004,2010 Free Software Foundation, Inc. |
| 4 | * |
| 5 | * This file is part of GNU Radio |
| 6 | * |
| 7 | * GNU Radio is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 3, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * GNU Radio is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with GNU Radio; see the file COPYING. If not, write to |
| 19 | * the Free Software Foundation, Inc., 51 Franklin Street, |
| 20 | * Boston, MA 02110-1301, USA. |
| 21 | */ |
| 22 | |
| 23 | /*
|
| 24 | * config.h is generated by configure. It contains the results |
| 25 | * of probing for features, options etc. It should be the first |
| 26 | * file included in your .cc file. |
| 27 | */ |
| 28 | #ifdef HAVE_CONFIG_H
|
| 29 | #include "config.h" |
| 30 | #endif
|
| 31 | |
| 32 | #include <howto_square2_ff.h> |
| 33 | #include <gr_io_signature.h> |
| 34 | |
| 35 | /*
|
| 36 | * Create a new instance of howto_square2_ff and return |
| 37 | * a boost shared_ptr. This is effectively the public constructor. |
| 38 | */ |
| 39 | howto_square2_ff_sptr |
| 40 | howto_make_square2_ff () |
| 41 | {
|
| 42 | return gnuradio::get_initial_sptr(new howto_square2_ff ()); |
| 43 | } |
| 44 | |
| 45 | /*
|
| 46 | * Specify constraints on number of input and output streams. |
| 47 | * This info is used to construct the input and output signatures |
| 48 | * (2nd & 3rd args to gr_block's constructor). The input and |
| 49 | * output signatures are used by the runtime system to |
| 50 | * check that a valid number and type of inputs and outputs |
| 51 | * are connected to this block. In this case, we accept |
| 52 | * only 1 input and 1 output. |
| 53 | */ |
| 54 | static const int MIN_IN = 1; // mininum number of input streams |
| 55 | static const int MAX_IN = 1; // maximum number of input streams |
| 56 | static const int MIN_OUT = 1; // minimum number of output streams |
| 57 | static const int MAX_OUT = 1; // maximum number of output streams |
| 58 | |
| 59 | /*
|
| 60 | * The private constructor |
| 61 | */ |
| 62 | howto_square2_ff::howto_square2_ff () |
| 63 | : gr_sync_block ("square2_ff",
|
| 64 | gr_make_io_signature (MIN_IN, MAX_IN, sizeof (float)), |
| 65 | gr_make_io_signature (MIN_OUT, MAX_OUT, sizeof (float))) |
| 66 | {
|
| 67 | // nothing else required in this example
|
| 68 | } |
| 69 | |
| 70 | /*
|
| 71 | * Our virtual destructor. |
| 72 | */ |
| 73 | howto_square2_ff::~howto_square2_ff () |
| 74 | {
|
| 75 | // nothing else required in this example
|
| 76 | } |
| 77 | |
| 78 | int
|
| 79 | howto_square2_ff::work (int noutput_items,
|
| 80 | gr_vector_const_void_star &input_items, |
| 81 | gr_vector_void_star &output_items) |
| 82 | {
|
| 83 | const float *in = (const float *) input_items[0]; |
| 84 | float *out = (float *) output_items[0]; |
| 85 | |
| 86 | for (int i = 0; i < noutput_items; i++){ |
| 87 | out[i] = in[i] * in[i]; |
| 88 | } |
| 89 | |
| 90 | // Tell runtime system how many output items we produced.
|
| 91 | return noutput_items;
|
| 92 | } |