Xylos (CCIR tones) TX, jammer update, SD card mod load

Xylos TX (CCIR tones) ;)
Jammer update, still buggy and inefficient
SD card module loader update

firmware/baseband/proc_afskrx.cpp

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "proc_afskrx.hpp"
+#include "sine_table.hpp"
+#include "portapack_shared_memory.hpp"
+
+using namespace lpc43xx;
+
+void AFSKRXProcessor::execute(buffer_c8_t buffer) {
+	/* Called every 2048/3072000 second -- 1500Hz. */
+
+	auto decimator_out = decimator.execute(buffer);
+
+	const buffer_c16_t work_baseband_buffer {
+		(complex16_t*)decimator_out.p,
+		sizeof(*decimator_out.p) * decimator_out.count
+	};
+
+	/* 96kHz complex<int16_t>[64]
+	 * -> FIR filter, <6kHz (0.063fs) pass, gain 1.0
+	 * -> 48kHz int16_t[32] */
+	auto channel = channel_filter.execute(decimator_out, work_baseband_buffer);
+
+	const buffer_s16_t work_audio_buffer {
+		(int16_t*)decimator_out.p,
+		sizeof(*decimator_out.p) * decimator_out.count
+	};
+	
+	/* 48kHz complex<int16_t>[32]
+	 * -> FM demodulation
+	 * -> 48kHz int16_t[32] */
+	auto audio = demod.execute(channel, work_audio_buffer);
+
+	/*static uint64_t audio_present_history = 0;
+	const auto audio_present_now = squelch.execute(audio);
+	audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
+	const bool audio_present = (audio_present_history != 0);
+*/
+	//if( !audio_present ) {
+		// Zero audio buffer.
+		/*for(size_t i=0; i<audio.count; i++) {
+			if ((i % 3) > 1)
+				audio.p[i] = 4096;
+			else
+				audio.p[i] = -4096;
+		}*/
+	//}
+
+	audio_hpf.execute_in_place(audio);
+
+	for(size_t i=0; i<audio.count; i++) {
+		if (spur > 10) {
+			if (audio.p[i] > 2000)
+				sign = 1;
+			if (audio.p[i] < -2000)
+				sign = 0;
+			spur = 0;
+		} else {
+			spur++;
+		}
+		if (sign != prev_sign) {
+			if (freq_timer < 15)		// 48
+				bit = 0;
+			else
+				bit++;
+			freq_timer = 0;
+		}
+		prev_sign = sign;
+		if (freq_timer < 1000) freq_timer++;	// TODO: Limit in a more intelligent way
+	}
+	
+	if (bit_timer >= 40) {
+		bit_timer = 0;
+		// Check bit state here !
+	} else {
+		bit_timer++;
+	}
+	
+    if (sc >= 600) {
+		sc = 0;
+		AFSKDataMessage message;
+		memcpy(message.data,aud,128*2);
+		shared_memory.application_queue.push(message);
+		audc = 0;
+	} else {
+		sc++;
+	}
+	
+	if (audc < 4) {
+		memcpy(aud+(audc*32),audio.p,32*2);
+		audc++;
+	}
+	
+	fill_audio_buffer(audio);
+}
+
+void AFSKRXProcessor::data_handler(
+	const double data
+) {
+	/*AFSKDataMessage message;
+	message.data = 'T';
+	shared_memory.application_queue.push(message);*/
+}