Rough implementation of capture mode

firmware/application/Makefile

@@ -179,6 +179,7 @@ CPPSRC = main.cpp \
          ../common/tpms_packet.cpp \
          ert_app.cpp \
          ../common/ert_packet.cpp \
+         capture_app.cpp \
          sd_card.cpp \
          file.cpp \
          log_file.cpp \

firmware/application/capture_app.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2016 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 "capture_app.hpp"
+
+#include "baseband_api.hpp"
+
+#include "utility.hpp"
+
+namespace ui {
+
+CaptureAppView::CaptureAppView(NavigationView&) {
+	capture_thread = std::make_unique<AudioThread>("baseband.c16");
+
+	radio::enable({
+		tuning_frequency(),
+		sampling_rate,
+		baseband_bandwidth,
+		rf::Direction::Receive,
+		false, 16, 16,
+		1,
+	});
+
+	baseband::start({
+		.mode = 7,
+		.sampling_rate = sampling_rate,
+		.decimation_factor = 1,
+	});
+}
+
+CaptureAppView::~CaptureAppView() {
+	baseband::stop();
+	radio::disable();
+}
+
+uint32_t CaptureAppView::target_frequency() const {
+	return initial_target_frequency;
+}
+
+uint32_t CaptureAppView::tuning_frequency() const {
+	return target_frequency() - (sampling_rate / 4);
+}
+
+} /* namespace ui */

firmware/application/capture_app.hpp

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 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 __CAPTURE_APP_HPP__
+#define __CAPTURE_APP_HPP__
+
+#include "ui_widget.hpp"
+#include "ui_navigation.hpp"
+
+#include "audio_thread.hpp"
+
+#include <string>
+#include <memory>
+
+namespace ui {
+
+class CaptureAppView : public View {
+public:
+	CaptureAppView(NavigationView& nav);
+	~CaptureAppView();
+
+	std::string title() const override { return "Capture"; };
+
+private:
+	static constexpr uint32_t initial_target_frequency = 91500000;
+	static constexpr uint32_t sampling_rate = 2457600;
+	static constexpr uint32_t baseband_bandwidth = 1750000;
+
+	std::unique_ptr<AudioThread> capture_thread;
+
+	uint32_t target_frequency() const;
+	uint32_t tuning_frequency() const;
+};
+
+} /* namespace ui */
+
+#endif/*__CAPTURE_APP_HPP__*/

firmware/application/ui_navigation.cpp

@@ -31,6 +31,7 @@
 #include "ais_app.hpp"
 #include "ert_app.hpp"
 #include "tpms_app.hpp"
+#include "capture_app.hpp"
 
 #include "core_control.hpp"
 
@@ -168,7 +169,7 @@ ReceiverMenuView::ReceiverMenuView(NavigationView& nav) {
 SystemMenuView::SystemMenuView(NavigationView& nav) {
 	add_items<7>({ {
 		{ "Receiver", [&nav](){ nav.push<ReceiverMenuView>(); } },
-		{ "Capture",  [&nav](){ nav.push<NotImplementedView>(); } },
+		{ "Capture",  [&nav](){ nav.push<CaptureAppView>(); } },
 		{ "Analyze",  [&nav](){ nav.push<NotImplementedView>(); } },
 		{ "Setup",    [&nav](){ nav.push<SetupMenuView>(); } },
 		{ "About",    [&nav](){ nav.push<AboutView>(); } },

firmware/baseband/Makefile

@@ -145,6 +145,7 @@ CPPSRC = main.cpp \
          proc_wideband_spectrum.cpp \
          proc_tpms.cpp \
          proc_ert.cpp \
+         proc_capture.cpp \
          dsp_squelch.cpp \
          clock_recovery.cpp \
          packet_builder.cpp \

firmware/baseband/baseband_thread.cpp

@@ -38,6 +38,7 @@
 #include "proc_wideband_spectrum.hpp"
 #include "proc_tpms.hpp"
 #include "proc_ert.hpp"
+#include "proc_capture.hpp"
 
 #include "portapack_shared_memory.hpp"
 
@@ -130,6 +131,7 @@ BasebandProcessor* BasebandThread::create_processor(const int32_t mode) {
 	case 4:		return new WidebandSpectrum();
 	case 5:		return new TPMSProcessor();
 	case 6:		return new ERTProcessor();
+	case 7:		return new CaptureProcessor();
 	default:	return nullptr;
 	}
 }

firmware/baseband/proc_capture.cpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2016 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_capture.hpp"
+
+#include "dsp_fir_taps.hpp"
+
+#include "utility.hpp"
+
+CaptureProcessor::CaptureProcessor() {
+	decim_0.configure(taps_200k_decim_0.taps, 33554432);
+	decim_1.configure(taps_200k_decim_1.taps, 131072);
+
+	stream = std::make_unique<StreamInput>(15);
+}
+
+void CaptureProcessor::execute(const buffer_c8_t& buffer) {
+	/* 2.4576MHz, 2048 samples */
+	const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
+	const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
+	const auto decimator_out = decim_1_out;
+
+	if( stream ) {
+		const size_t bytes_to_write = sizeof(*decimator_out.p) * decimator_out.count;
+		const auto result = stream->write(decimator_out.p, bytes_to_write);
+	}
+}

firmware/baseband/proc_capture.hpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2016 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_CAPTURE_HPP__
+#define __PROC_CAPTURE_HPP__
+
+#include "baseband_processor.hpp"
+#include "dsp_decimate.hpp"
+
+#include "stream_input.hpp"
+
+#include <array>
+#include <memory>
+
+class CaptureProcessor : public BasebandProcessor {
+public:
+	CaptureProcessor();
+
+	void execute(const buffer_c8_t& buffer) override;
+
+private:
+	std::array<complex16_t, 512> dst;
+	const buffer_c16_t dst_buffer {
+		dst.data(),
+		dst.size()
+	};
+
+	dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0;
+	dsp::decimate::FIRC16xR16x16Decim2 decim_1;
+
+	std::unique_ptr<StreamInput> stream;
+};
+
+#endif/*__PROC_CAPTURE_HPP__*/