Improved close call precision

firmware/baseband/Makefile

@@ -144,6 +144,7 @@ CPPSRC = main.cpp \
          proc_wfm_audio.cpp \
          proc_ais.cpp \
          proc_wideband_spectrum.cpp \
+         proc_closecall.cpp \
          proc_tpms.cpp \
          proc_ert.cpp \
          proc_capture.cpp \

firmware/baseband/baseband_thread.cpp

@@ -36,6 +36,7 @@
 #include "proc_wfm_audio.hpp"
 #include "proc_ais.hpp"
 #include "proc_wideband_spectrum.hpp"
+#include "proc_closecall.hpp"
 #include "proc_tpms.hpp"
 #include "proc_ert.hpp"
 #include "proc_capture.hpp"
@@ -132,7 +133,7 @@ BasebandProcessor* BasebandThread::create_processor(const int32_t mode) {
 	case 5:		return new TPMSProcessor();
 	case 6:		return new ERTProcessor();
 	case 7:		return new CaptureProcessor();
-	case 10:	return new WidebandSpectrum();	// Close call
+	case 10:	return new CloseCallProcessor();
 	default:	return nullptr;
 	}
 }

firmware/baseband/proc_closecall.cpp

@@ -0,0 +1,72 @@
+/*
+ * 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_closecall.hpp"
+
+#include "event_m4.hpp"
+
+#include <cstdint>
+#include <cstddef>
+
+#include <array>
+
+void CloseCallProcessor::execute(const buffer_c8_t& buffer) {
+	// 2048 complex8_t samples per buffer.
+	// 102.4us per buffer. 20480 instruction cycles per buffer.
+
+	if( phase == 0 ) {
+		std::fill(spectrum.begin(), spectrum.end(), 0);
+	}
+
+	for(size_t i=0; i<spectrum.size(); i++) {
+		// TODO: Removed window-presum windowing, due to lack of available code RAM.
+		// TODO: Apply window to improve spectrum bin sidelobes.
+		spectrum[i] += buffer.p[i +    0];
+		spectrum[i] += buffer.p[i + 1024];
+	}
+
+	if( phase == 127 ) {
+		const buffer_c16_t buffer_c16 {
+			spectrum.data(),
+			spectrum.size(),
+			buffer.sampling_rate
+		};
+		channel_spectrum.feed(
+			buffer_c16,
+			0, 0
+		);
+		phase = 0;
+	} else {
+		phase++;
+	}
+}
+
+void CloseCallProcessor::on_message(const Message* const message) {
+	switch(message->id) {
+	case Message::ID::UpdateSpectrum:
+	case Message::ID::SpectrumStreamingConfig:
+		channel_spectrum.on_message(message);
+		break;
+		
+	default:
+		break;
+	}
+}

firmware/baseband/proc_closecall.hpp

@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+
+#ifndef __PROC_CLOSECALLPROCESSOR_H__
+#define __PROC_CLOSECALLPROCESSOR_H__
+
+#include "baseband_processor.hpp"
+#include "spectrum_collector.hpp"
+
+#include "message.hpp"
+
+#include <cstddef>
+#include <array>
+#include <complex>
+
+class CloseCallProcessor : public BasebandProcessor {
+public:
+	void execute(const buffer_c8_t& buffer) override;
+
+	void on_message(const Message* const message) override;
+
+private:
+	SpectrumCollector channel_spectrum;
+
+	std::array<complex16_t, 256> spectrum;
+
+	size_t phase = 0;
+};
+
+#endif/*__PROC_CLOSECALLPROCESSOR_H__*/

firmware/baseband/spectrum_collector.cpp

@@ -47,6 +47,7 @@ void SpectrumCollector::on_message(const Message* const message) {
 }
 
 void SpectrumCollector::set_state(const SpectrumStreamingConfigMessage& message) {
+	set_decimation_factor(message.decimation_factor);
 	if( message.mode == SpectrumStreamingConfigMessage::Mode::Running ) {
 		start();
 	} else {