Added new blocks for clock freqeuncy correction
diff --git a/lib/misc_utils/controlled_const_source_f_impl.cc b/lib/misc_utils/controlled_const_source_f_impl.cc
new file mode 100644
index 0000000..d58f04f
--- /dev/null
+++ b/lib/misc_utils/controlled_const_source_f_impl.cc
@@ -0,0 +1,86 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 <+YOU OR YOUR COMPANY+>.
+ *
+ * This 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.
+ *
+ * This software 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 software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "controlled_const_source_f_impl.h"
+
+namespace gr {
+ namespace gsm {
+
+ controlled_const_source_f::sptr
+ controlled_const_source_f::make(float constant)
+ {
+ return gnuradio::get_initial_sptr
+ (new controlled_const_source_f_impl(constant));
+ }
+
+ void controlled_const_source_f_impl::set_constant_msg(pmt::pmt_t msg){
+ if(pmt::is_real(msg)){
+ set_constant(pmt::to_double(msg));
+ }
+ }
+
+ /*
+ * The private constructor
+ */
+ controlled_const_source_f_impl::controlled_const_source_f_impl(float constant)
+ : gr::sync_block("controlled_const_source_f",
+ gr::io_signature::make(0, 0, 0),
+ gr::io_signature::make(1, 1, sizeof(float)))
+ {
+ set_constant(constant);
+ message_port_register_in(pmt::mp("constant_msg"));
+ set_msg_handler(pmt::mp("constant_msg"), boost::bind(&controlled_const_source_f_impl::set_constant_msg, this, _1));
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ controlled_const_source_f_impl::~controlled_const_source_f_impl()
+ {
+ }
+
+ int
+ controlled_const_source_f_impl::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ float *optr = (float*)output_items[0];
+ float t;
+
+ t = d_constant;
+ std::fill_n(optr, noutput_items, t);
+
+ return noutput_items;
+ }
+
+ void controlled_const_source_f_impl::set_constant(float constant){
+ d_constant = constant;
+ }
+
+
+
+ } /* namespace gsm */
+} /* namespace gr */
+