Improved close call precision

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;
+	}
+}