limesdr: basic implementation of LimeSDR support

The commit provides a basic implementation of support for LimeSDR USB
receivers based on LMS7002 chip. The solution has several limitations:
 - passing parameters for tune LimeSDR receiver via command-line
   options is not implemented;
 - only hardcoded configuration is used (channel 0 of lower band LNA,
   LMS_FMT_I16 format, gain, bandwidth and timeout);
 - only one device is supported and it is not possible to select a
   desired one in case if several devices are connected to the host.

Test: compare the output of the program for RTL and LimeSDR receivers.
Environment:
 - RTL2832SDR dongle;
 - LMS7002M based USB LimeSDR board;
 - 800MHz-2200MHz omnidirectional antenna with SMA connector.
Procedure:
 - connect RTL dongle to the host and start the program with the
   following parameters:
   $ ./dump1090 --device-type rtlsdr --interactive
 - wait until several planes will be detected;
 - stop the program, connect the LimeSDR board to the host and restart
   the program with the following parameters:
   $ ./dump1090 --device-type limesdr --interactive
 - ensure that the same planes are detected.
Acceptance criteria: the same planes are detected using both receivers
   and track information matches with information from the
   FlightRadar24 application.

Signed-off-by: Gluttton <gluttton@ukr.net>

Makefile

@@ -2,6 +2,7 @@ PROGNAME=dump1090
 
 RTLSDR ?= yes
 BLADERF ?= yes
+LIMESDR ?= yes
 
 CPPFLAGS += -DMODES_DUMP1090_VERSION=\"$(DUMP1090_VERSION)\" -DMODES_DUMP1090_VARIANT=\"dump1090-fa\"
 
@@ -39,6 +40,13 @@ ifeq ($(BLADERF), yes)
   LIBS_SDR += $(shell pkg-config --libs libbladeRF)
 endif
 
+ifeq ($(LIMESDR), yes)
+  SDR_OBJ += sdr_limesdr.o
+  CPPFLAGS += -DENABLE_LIMESDR
+  CFLAGS += $(shell pkg-config --cflags LimeSuite)
+  LIBS_SDR += $(shell pkg-config --libs LimeSuite)
+endif
+
 all: dump1090 view1090
 
 %.o: %.c *.h

README.md

@@ -36,6 +36,11 @@ see https://flightaware.com/adsb/piaware/install
 
 This is packaged with jessie. `sudo apt-get install librtlsdr-dev`
 
+### Dependencies - LimeSDR
+
+You will need a build of [LimeSuite](https://github.com/myriadrf/LimeSuite).  
+See detailed instruction on [the official Wiki](https://wiki.myriadrf.org/Lime_Suite) how to build and install it.
+
 ### Actually building it
 
 Nothing special, just build it (`dpkg-buildpackage -b`)
@@ -45,7 +50,7 @@ Nothing special, just build it (`dpkg-buildpackage -b`)
 First run `prepare-wheezy-tree.sh`. This will create a package tree in
 package-wheezy/. Build in there (`dpkg-buildpackage -b`)
 
-The wheezy build does not include bladeRF support.
+The wheezy build does not include bladeRF and LimeSDR support.
 
 ## Building manually
 
@@ -56,5 +61,8 @@ install them (and a method for starting them) yourself.
 ``make BLADERF=no`` will disable bladeRF support and remove the dependency on
 libbladeRF.
 
-``make RTLSDR=no`` will disable rtl-sdr support and remove the dependency on 
+``make RTLSDR=no`` will disable rtl-sdr support and remove the dependency on
 librtlsdr.
+
+``make LIMESDR=no`` will disable LimeSDR support and remove the dependency on
+libLimeSuite.

dump1090.c

@@ -267,6 +267,9 @@ void showHelp(void) {
 #ifdef ENABLE_BLADERF
            "ENABLE_BLADERF "
 #endif
+#ifdef ENABLE_LIMESDR
+           "ENABLE_LIMESDR "
+#endif
 #ifdef SC16Q11_TABLE_BITS
     // This is a little silly, but that's how the preprocessor works..
 #define _stringize(x) #x

dump1090.h

@@ -280,7 +280,7 @@ typedef enum {
 //======================== structure declarations =========================
 
 typedef enum {
-    SDR_NONE, SDR_IFILE, SDR_RTLSDR, SDR_BLADERF
+    SDR_NONE, SDR_IFILE, SDR_RTLSDR, SDR_BLADERF, SDR_LIMESDR
 } sdr_type_t;
 
 // Structure representing one magnitude buffer

sdr.c

@@ -27,6 +27,9 @@
 #ifdef ENABLE_BLADERF
 #  include "sdr_bladerf.h"
 #endif
+#ifdef ENABLE_LIMESDR
+#  include "sdr_limesdr.h"
+#endif
 
 typedef struct {
     const char *name;
@@ -85,6 +88,10 @@ static sdr_handler sdr_handlers[] = {
     { "bladerf", SDR_BLADERF, bladeRFInitConfig, bladeRFShowHelp, bladeRFHandleOption, bladeRFOpen, bladeRFRun, bladeRFClose },
 #endif
 
+#ifdef ENABLE_LIMESDR
+    { "limesdr", SDR_LIMESDR, limesdrInitConfig, limesdrShowHelp, limesdrHandleOption, limesdrOpen, limesdrRun, limesdrClose },
+#endif
+
     { "ifile", SDR_IFILE, ifileInitConfig, ifileShowHelp, ifileHandleOption, ifileOpen, ifileRun, ifileClose },
     { "none", SDR_NONE, noInitConfig, noShowHelp, noHandleOption, noOpen, noRun, noClose },