rtl_tcp: implement sample rate and gain control

grc/gen_osmosdr_blocks.py

@@ -115,7 +115,7 @@ of devices. If left blank, the first device found will be used.
 Examples (some arguments may be optional):
   fcd=0
   rtl=0,rtl_xtal=28.80001e6,tuner_xtal=26e6,buffers=64 ...
-  rtl_tcp=host=127.0.0.1,port=1234,eof=false,wait=true,psize=16384
+  rtl_tcp=host=127.0.0.1,port=1234,psize=16384
   uhd=0|name,mcr=52e6,nchan=2,subdev='\\\\'B:0 A:0'\\\\' ...
   osmosdr=0|name,mcr=64e6,nchan=5,port=/dev/ttyUSB0 ...
   file=/path/to/file.ext,freq=428e6,rate=1e6,repeat=true,throttle=true ...

lib/rtl/rtl_source_c.cc

@@ -435,7 +435,7 @@ bool rtl_source_c::get_gain_mode( size_t chan )
   return _auto_gain;
 }
 
-double pick_closest_gain(osmosdr::gain_range_t &gains, double required)
+static double pick_closest_gain(osmosdr::gain_range_t &gains, double required)
 {
   double result = required;
   double distance = 100;

lib/rtl_tcp/rtl_tcp_source_c.cc

@@ -46,12 +46,12 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
 {
   std::string host = "127.0.0.1";
   unsigned short port = 1234;
-  bool eof = false;
-  bool wait = true;
   int payload_size = 16384;
 
   _freq = 0;
   _rate = 0;
+  _gain = 0;
+  _auto_gain = false;
 
   dict_t dict = params_to_dict(args);
 
@@ -61,12 +61,6 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
   if (dict.count("port"))
     port = boost::lexical_cast< unsigned short >( dict["port"] );
 
-  if (dict.count("eof"))
-    eof = "true" == dict["eof"] ? true : false;
-
-  if (dict.count("wait"))
-    wait = "true" == dict["wait"] ? true : false;
-
   if (dict.count("psize"))
     payload_size = boost::lexical_cast< int >( dict["psize"] );
 
@@ -80,7 +74,9 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
     payload_size = 16384;
 
   _src = make_rtl_tcp_source_f(sizeof(float), host.c_str(), port, payload_size,
-                               eof, wait);
+                               false, false);
+
+  set_gain_mode(false); // enable manual gain mode by default
 
   /* rtl tcp source provides a stream of interleaved IQ floats */
   gr_deinterleave_sptr deinterleave = gr_make_deinterleave(sizeof(float));
@@ -117,13 +113,24 @@ osmosdr::meta_range_t rtl_tcp_source_c::get_sample_rates( void )
 {
   osmosdr::meta_range_t range;
 
-  range += osmosdr::range_t( get_sample_rate() );
+  range += osmosdr::range_t( 1024000 ); // known to work
+  range += osmosdr::range_t( 1800000 ); // known to work
+  range += osmosdr::range_t( 2048000 ); // known to work
+  range += osmosdr::range_t( 2400000 ); // may work
+  range += osmosdr::range_t( 2600000 ); // may work
+  range += osmosdr::range_t( 2800000 ); // may work
+  range += osmosdr::range_t( 3000000 ); // may work
+  range += osmosdr::range_t( 3200000 ); // max rate, may work
 
   return range;
 }
 
 double rtl_tcp_source_c::set_sample_rate( double rate )
 {
+  _src->set_sample_rate( int(rate) );
+
+  _rate = rate;
+
   return get_sample_rate();
 }
 
@@ -170,7 +177,26 @@ std::vector<std::string> rtl_tcp_source_c::get_gain_names( size_t chan )
 
 osmosdr::gain_range_t rtl_tcp_source_c::get_gain_range( size_t chan )
 {
-  osmosdr::gain_range_t range(0, 0);
+  osmosdr::gain_range_t range;
+
+  range += osmosdr::range_t( -1.0 );
+  range += osmosdr::range_t( 1.5 );
+  range += osmosdr::range_t( 4.0 );
+  range += osmosdr::range_t( 6.5 );
+  range += osmosdr::range_t( 9.0 );
+  range += osmosdr::range_t( 11.5 );
+  range += osmosdr::range_t( 14.0 );
+  range += osmosdr::range_t( 16.5 );
+  range += osmosdr::range_t( 19.0 );
+  range += osmosdr::range_t( 21.5 );
+  range += osmosdr::range_t( 24.0 );
+  range += osmosdr::range_t( 29.0 );
+  range += osmosdr::range_t( 34.0 );
+  range += osmosdr::range_t( 42.0 );
+  range += osmosdr::range_t( 43.0 );
+  range += osmosdr::range_t( 45.0 );
+  range += osmosdr::range_t( 47.0 );
+  range += osmosdr::range_t( 49.0 );
 
   return range;
 }
@@ -182,16 +208,45 @@ osmosdr::gain_range_t rtl_tcp_source_c::get_gain_range( const std::string & name
 
 bool rtl_tcp_source_c::set_gain_mode( bool mode, size_t chan )
 {
+  _src->set_gain_mode(int(!mode));
+
+  _auto_gain = mode;
+
   return get_gain_mode(chan);
 }
 
 bool rtl_tcp_source_c::get_gain_mode( size_t chan )
 {
-  return true;
+  return _auto_gain;
+}
+
+static double pick_closest_gain(osmosdr::gain_range_t &gains, double required)
+{
+  double result = required;
+  double distance = 100;
+
+  BOOST_FOREACH(osmosdr::range_t gain, gains)
+  {
+    double diff = fabs(gain.start() - required);
+
+    if (diff < distance) {
+      distance = diff;
+      result = gain.start();
+    }
+  }
+
+  return result;
 }
 
 double rtl_tcp_source_c::set_gain( double gain, size_t chan )
 {
+  osmosdr::gain_range_t gains = rtl_tcp_source_c::get_gain_range( chan );
+  double picked_gain = pick_closest_gain( gains, gain );
+
+  _src->set_gain( int(picked_gain * 10.0) );
+
+  _gain = gain;
+
   return get_gain(chan);
 }
 

lib/rtl_tcp/rtl_tcp_source_c.h

@@ -75,7 +75,8 @@ public:
   std::string get_antenna( size_t chan = 0 );
 
 private:
-  double _freq, _rate;
+  double _freq, _rate, _gain;
+  bool _auto_gain;
   rtl_tcp_source_f_sptr _src;
 };
 

lib/rtl_tcp/rtl_tcp_source_f.cc

@@ -82,9 +82,7 @@ rtl_tcp_source_f::rtl_tcp_source_f(size_t itemsize,
 	d_eof(eof),
   d_wait(wait),
   d_socket(-1),
-  d_residual(0),
-  d_temp_offset(0),
-  curr_freq(0)
+  d_temp_offset(0)
 {
 	int ret = 0;
 	struct sockaddr_in cliaddr;
@@ -248,12 +246,24 @@ struct command{
 
 void rtl_tcp_source_f::set_freq(int freq)
 {
-	struct command cmd;
-	
-	if (freq != curr_freq) {
-		cmd.cmd = 0x01;
-		cmd.param = freq;
-		send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
-		curr_freq = freq;
-	}
+  struct command cmd = { 0x01, freq };
+  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
+}
+
+void rtl_tcp_source_f::set_sample_rate(int sample_rate)
+{
+  struct command cmd = { 0x02, sample_rate };
+  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
+}
+
+void rtl_tcp_source_f::set_gain_mode(int manual)
+{
+  struct command cmd = { 0x03, manual };
+  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
+}
+
+void rtl_tcp_source_f::set_gain(int gain)
+{
+  struct command cmd = { 0x04, gain };
+  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
 }

lib/rtl_tcp/rtl_tcp_source_f.h

@@ -66,9 +66,7 @@ private:
   bool          d_wait;          // wait if data if not immediately available
   int           d_socket;        // handle to socket
   unsigned char *d_temp_buff;    // hold buffer between calls
-  ssize_t       d_residual;   // hold information about number of bytes stored in the temp buffer
-  size_t        d_temp_offset; // point to temp buffer location offset
-  int           curr_freq;
+  size_t        d_temp_offset;   // point to temp buffer location offset
   float         *d_LUT;
 
  private:
@@ -93,6 +91,9 @@ private:
 	   gr_vector_void_star &output_items);
 
   void set_freq(int freq);
+  void set_sample_rate(int sample_rate);
+  void set_gain_mode(int manual);
+  void set_gain(int gain);
 };