Quick and dirty temperature logger, debug view of temp vs. time.

firmware/application/temperature_logger.cpp

@@ -0,0 +1,65 @@
+/*
+ * 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 "temperature_logger.hpp"
+
+#include "radio.hpp"
+
+#include <algorithm>
+
+void TemperatureLogger::second_tick() {
+	sample_phase++;
+	if( sample_phase >= sample_interval ) {
+		push_sample(read_sample());
+	}
+}
+
+size_t TemperatureLogger::size() const {
+	return std::min(samples.size(), samples_count);
+}
+
+std::vector<TemperatureLogger::sample_t> TemperatureLogger::history() const {
+	std::vector<sample_t> result;
+
+	const auto n = size();
+	result.resize(n);
+	
+	// Copy the last N samples from the buffer, since new samples are added at the end.
+	std::copy(samples.cend() - n, samples.cend(), result.data());
+	
+	return result;
+}
+
+TemperatureLogger::sample_t TemperatureLogger::read_sample() {
+	// MAX2837 does not return a valid temperature if in "shutdown" mode.
+	return radio::second_if.temp_sense() & 0x1f;
+}
+
+void TemperatureLogger::push_sample(const TemperatureLogger::sample_t sample) {
+	// Started out building a pseudo-FIFO, then got lazy.
+
+	// Shift samples: samples[1:] -> samples[0:-1]
+	// New sample goes into samples[-1]
+	std::copy(samples.cbegin() + 1, samples.cend(), samples.begin());
+	samples.back() = sample;
+	samples_count++;
+	sample_phase = 0;
+}