Added Foxhunt Mode

src/foxhunt/foxhunt.cpp

@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <cstring>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <math.h>
+#include <time.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+
+#include "../librpitx/src/librpitx.h"
+
+
+int FileFreqTiming;
+
+ngfmdmasync *fmmod;
+static double GlobalTuningFrequency=00000.0;
+int FifoSize=10000; //10ms
+double frequencyshift=20000;
+bool running=true;
+
+void playtone(double Frequency,uint32_t Timing)//Timing in 0.1us
+{
+                uint32_t SumTiming=0;
+                SumTiming+=Timing%100;
+                if(SumTiming>=100)
+                {
+                        Timing+=100;
+                        SumTiming=SumTiming-100;
+                }
+                int NbSamples=(Timing/100);
+
+                while(NbSamples>0)
+                {
+                        usleep(10);
+                        int Available=fmmod->GetBufferAvailable();
+                        if(Available>FifoSize/2)
+                        {
+                                int Index=fmmod->GetUserMemIndex();
+                                if(Available>NbSamples) Available=NbSamples;
+                                for(int j=0;j<Available;j++)
+                                {
+                                        fmmod->SetFrequencySample(Index+j,Frequency);
+                                        NbSamples--;
+
+                                }
+                        }
+                }
+}
+
+
+
+
+
+static void SendTones()
+{
+double basefreq = 1100;
+double freq2 = 1100 + frequencyshift;
+while(running)
+{
+        playtone( 1100 , 10000000) ;
+        playtone( freq2 , 10000000) ;
+}
+}
+
+static void
+terminate(int num)
+{
+    running=false;
+        fprintf(stderr,"Caught signal - Terminating %x\n",num);
+
+}
+
+int main(int argc, char **argv)
+{
+        float frequency=144.5e6;
+        if (argc > 1)
+        {
+
+
+                 frequency=atof(argv[1]);
+                 frequencyshift=atof(argv[2]);
+
+        }
+        else
+        {
+                printf("usage : foxhunt frequency(Hz) frequency shift(Hz)\n");
+                exit(0);
+        }
+
+        for (int i = 0; i < 64; i++) {
+        struct sigaction sa;
+
+        std::memset(&sa, 0, sizeof(sa));
+        sa.sa_handler = terminate;
+        sigaction(i, &sa, NULL);
+    }
+
+        fmmod=new ngfmdmasync(frequency,100000,14,FifoSize);
+        SendTones();
+        delete fmmod;
+        return 0;
+}
+
+
+
+