rtl,rtl_tcp: add bias=0|1 parameter to switch off|on bias voltage on

gpio0

grc/gen_osmosdr_blocks.py

@@ -251,8 +251,8 @@
   rtl=serial_number ...
   rtl=0[,rtl_xtal=28.8e6][,tuner_xtal=28.8e6] ...
   rtl=1[,buffers=32][,buflen=N*512] ...
-  rtl=2[,direct_samp=0|1|2][,offset_tune=0|1] ...
-  rtl_tcp=127.0.0.1:1234[,psize=16384][,direct_samp=0|1|2][,offset_tune=0|1] ...
+  rtl=2[,direct_samp=0|1|2][,offset_tune=0|1][,bias=0|1] ...
+  rtl_tcp=127.0.0.1:1234[,psize=16384][,direct_samp=0|1|2][,offset_tune=0|1][,bias=0|1] ...
   osmosdr=0[,buffers=32][,buflen=N*512] ...
   file='/path/to/your file',rate=1e6[,freq=100e6][,repeat=true][,throttle=true] ...
   netsdr=127.0.0.1[:50000][,nchan=2]

lib/rtl/rtl_source_c.cc

@@ -92,6 +92,7 @@ rtl_source_c::rtl_source_c (const std::string &args)
 {
   int ret;
   int index;
+  int bias_tee = 0;
   unsigned int dev_index = 0, rtl_freq = 0, tuner_freq = 0, direct_samp = 0;
   unsigned int offset_tune = 0;
   char manufact[256];
@@ -150,6 +151,9 @@ rtl_source_c::rtl_source_c (const std::string &args)
   if (dict.count("offset_tune"))
     offset_tune = boost::lexical_cast< unsigned int >( dict["offset_tune"] );
 
+  if (dict.count("bias"))
+    bias_tee = boost::lexical_cast<bool>( dict["bias"] );
+
   _buf_num = _buf_len = _buf_head = _buf_used = _buf_offset = 0;
 
   if (dict.count("buffers"))
@@ -217,6 +221,10 @@ rtl_source_c::rtl_source_c (const std::string &args)
       throw std::runtime_error("Failed to enable offset tuning.");
   }
 
+  ret = rtlsdr_set_bias_tee(_dev, bias_tee);
+  if (ret < 0)
+    throw std::runtime_error("Failed to set bias tee.");
+
   ret = rtlsdr_reset_buffer( _dev );
   if (ret < 0)
     throw std::runtime_error("Failed to reset usb buffers.");

lib/rtl_tcp/rtl_tcp_source_c.cc

@@ -154,6 +154,7 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
   unsigned short port = 1234;
   int payload_size = 16384;
   unsigned int direct_samp = 0, offset_tune = 0;
+  int bias_tee = 0;
 
   _freq = 0;
   _rate = 0;
@@ -182,6 +183,9 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
   if (dict.count("offset_tune"))
     offset_tune = boost::lexical_cast< unsigned int >( dict["offset_tune"] );
 
+  if (dict.count("bias"))
+    bias_tee = boost::lexical_cast<bool>( dict["bias"] );
+
   if (!host.length())
     host = "127.0.0.1";
 
@@ -218,7 +222,6 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
     report_error("rtl_tcp_source_f/getaddrinfo",
                  "can't initialize source socket" );
 
-  // FIXME leaks if report_error throws below
   d_temp_buff = new unsigned char[payload_size];   // allow it to hold up to payload_size bytes
   d_LUT = new float[0x100];
   for (int i = 0; i < 0x100; ++i)
@@ -293,14 +296,20 @@ rtl_tcp_source_c::rtl_tcp_source_c(const std::string &args) :
   set_gain_mode(false); /* enable manual gain mode by default */
 
   // set direct sampling
-  struct command cmd = { 0x09, htonl(direct_samp) };
+  struct command cmd;
+
+  cmd = { 0x09, htonl(direct_samp) };
   send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
   if (direct_samp)
     _no_tuner = true;
 
   // set offset tuning
   cmd = { 0x0a, htonl(offset_tune) };
   send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
+
+  // set bias tee
+  cmd = { 0x0e, htonl(bias_tee) };
+  send(d_socket, (const char*)&cmd, sizeof(cmd), 0);
 }
 
 rtl_tcp_source_c::~rtl_tcp_source_c()