From d34149cd190be59d5c8c2c223fe20fe446a019fb Mon Sep 17 00:00:00 2001
From: F5OEO <evaristec@gmail.com>
Date: Fri, 2 Nov 2018 14:21:54 +0000
Subject: [PATCH] FT8 Tx using LIB_FT8 from Karlis Goba, YL3JG - Need to
 package it according to library

---
 src/pift8/Makefile  |  17 ++++++
 src/pift8/pift8.cpp | 127 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+)
 create mode 100644 src/pift8/Makefile
 create mode 100644 src/pift8/pift8.cpp

diff --git a/src/pift8/Makefile b/src/pift8/Makefile
new file mode 100644
index 0000000..de96446
--- /dev/null
+++ b/src/pift8/Makefile
@@ -0,0 +1,17 @@
+CXXFLAGS = -std=c++14 -I.
+LDFLAGS = -lm
+
+gen_ft8: gen_ft8.o ft8/encode.o ft8/pack.o ft8/text.o ft8/pack_77.o ft8/encode_91.o common/wave.o
+	$(CXX) $(LDFLAGS) -o $@ $^
+
+pift8: pift8.o ft8/encode.o ft8/pack.o ft8/text.o ft8/pack_77.o ft8/encode_91.o common/wave.o ../librpitx/src/librpitx.a
+	$(CXX) $(LDFLAGS) -o $@ $^
+
+.PHONY: run_tests
+
+run_tests: test
+	@./test
+
+test:  test.o ft8/encode.o ft8/pack.o ft8/text.o ft8/pack_77.o ft8/encode_91.o ft8/unpack.o
+	$(CXX) $(LDFLAGS) -o $@ $^
+
diff --git a/src/pift8/pift8.cpp b/src/pift8/pift8.cpp
new file mode 100644
index 0000000..4fc61ef
--- /dev/null
+++ b/src/pift8/pift8.cpp
@@ -0,0 +1,127 @@
+#include <cstdlib>
+#include <cstring>
+#include <cstdio>
+#include <cmath>
+#include <signal.h>
+
+#include "common/wave.h"
+#include "ft8/pack.h"
+#include "ft8/encode.h"
+#include "ft8/pack_77.h"
+#include "ft8/encode_91.h"
+
+#include "../librpitx/src/librpitx.h"
+
+bool running=true;
+
+// Convert a sequence of symbols (tones) into a sinewave of continuous phase (FSK).
+// Symbol 0 gets encoded as a sine of frequency f0, the others are spaced in increasing
+// fashion.
+void synth_fsk(const uint8_t *symbols, int num_symbols, float f0, float spacing, 
+                float symbol_rate, float signal_rate, float *signal) {
+    float phase = 0;
+    float dt = 1/signal_rate;
+    float dt_sym = 1/symbol_rate;
+    float t = 0;
+    int j = 0;
+    int i = 0;
+    while (j < num_symbols) {
+        float f = f0 + symbols[j] * spacing;
+        phase += 2 * M_PI * f / signal_rate;
+        signal[i] = sin(phase);
+        t += dt;
+        if (t >= dt_sym) {
+            // Move to the next symbol
+            t -= dt_sym;
+            ++j;
+        }
+        ++i;
+    }
+}
+
+
+void usage() {
+    printf("Generate a 15-second WAV file encoding a given message.\n");
+    printf("Usage:\n");
+    printf("\n");
+    printf("gen_ft8 MESSAGE WAV_FILE\n");
+    printf("\n");
+    printf("(Note that you might have to enclose your message in quote marks if it contains spaces)\n");
+}
+
+
+static void
+terminate(int num)
+{
+    running=false;
+	fprintf(stderr,"Caught signal - Terminating\n");
+   
+}
+
+int main(int argc, char **argv) {
+    // Expect two command-line arguments
+    if (argc < 3) {
+        usage();
+        return -1;
+    }
+
+    const char *message = argv[1];
+    const char *wav_path = argv[2];
+
+    // First, pack the text data into 72-bit binary message
+    uint8_t packed[10];
+    //int rc = packmsg(message, packed);
+    int rc = ft8_v2::pack77(message, packed);
+    if (rc < 0) {
+        printf("Cannot parse message!\n");
+        printf("RC = %d\n", rc);
+        return -2;
+    }
+
+    printf("Packed data: ");
+    for (int j = 0; j < 10; ++j) {
+        printf("%02x ", packed[j]);
+    }
+    printf("\n");
+
+    // Second, encode the binary message as a sequence of FSK tones
+    uint8_t tones[NN];          // NN = 79, lack of better name at the moment
+    //genft8(packed, 0, tones);
+    ft8_v2::genft8(packed, tones);
+
+    printf("FSK tones: ");
+    for (int j = 0; j < NN; ++j) {
+        printf("%d", tones[j]);
+    }
+    printf("\n");
+
+    // Third, convert the FSK tones into an audio signal
+    const int num_samples = (int)(0.5 + NN / 6.25 * 12000);
+    const int num_silence = (15 * 12000 - num_samples) / 2;
+    float signal[num_silence + num_samples + num_silence];
+    for (int i = 0; i < num_silence + num_samples + num_silence; i++) {
+        signal[i] = 0;
+    }
+
+    for (int i = 0; i < 64; i++) {
+        struct sigaction sa;
+
+        memset(&sa, 0, sizeof(sa));
+        sa.sa_handler = terminate;
+        sigaction(i, &sa, NULL);
+    }
+
+    ngfmdmasync fmmod(14.070e6,6.25*10000,14,1000);
+	padgpio pad;
+	pad.setlevel(7);// Set max power
+
+	float VCOFreq[10000];
+    for(size_t i=0;(i<NN)&&running;i++)
+    {
+		for(int j=0;j<10000;j++) VCOFreq[j]=6.25*(float)tones[i];
+		fmmod.SetFrequencySamples(VCOFreq,10000);
+	    fprintf(stderr,"Freq %f\n",VCOFreq[i]);
+    }
+     
+    return 0;
+}