Const/pass-by-reference a bunch more baseband stuff.

firmware/baseband/audio_stats_collector.hpp

@@ -32,7 +32,7 @@
 class AudioStatsCollector {
 public:
 	template<typename Callback>
-	void feed(buffer_s16_t src, Callback callback) {
+	void feed(const buffer_s16_t& src, Callback callback) {
 		consume_audio_buffer(src);
 
 		if( update_stats(src.count, src.sampling_rate) ) {
@@ -55,7 +55,7 @@ private:
 
 	AudioStatistics statistics;
 
-	void consume_audio_buffer(buffer_s16_t src) {
+	void consume_audio_buffer(const buffer_s16_t& src) {
 		auto src_p = src.p;
 		const auto src_end = &src.p[src.count];
 		while(src_p < src_end) {

firmware/baseband/baseband_processor.hpp

@@ -37,7 +37,7 @@ class BasebandProcessor {
 public:
 	virtual ~BasebandProcessor() = default;
 
-	virtual void execute(buffer_c8_t& buffer) = 0;
+	virtual void execute(const buffer_c8_t& buffer) = 0;
 
 	void update_spectrum();
 

firmware/baseband/baseband_stats_collector.hpp

@@ -46,7 +46,7 @@ public:
 	}
 
 	template<typename Callback>
-	void process(buffer_c8_t buffer, Callback callback) {
+	void process(const buffer_c8_t& buffer, Callback callback) {
 		samples += buffer.count;
 
 		const size_t report_samples = buffer.sampling_rate * report_interval;

firmware/baseband/block_decimator.hpp

@@ -65,7 +65,7 @@ public:
 	}
 
 	template<typename BlockCallback>
-	void feed(const buffer_c16_t src, BlockCallback callback) {
+	void feed(const buffer_c16_t& src, BlockCallback callback) {
 		/* NOTE: Input block size must be >= factor */
 
 		set_input_sampling_rate(src.sampling_rate);

firmware/baseband/channel_decimator.cpp

@@ -21,7 +21,7 @@
 
 #include "channel_decimator.hpp"
 
-buffer_c16_t ChannelDecimator::execute_decimation(buffer_c8_t buffer) {
+buffer_c16_t ChannelDecimator::execute_decimation(const buffer_c8_t& buffer) {
 	const buffer_c16_t work_baseband_buffer {
 		work_baseband.data(),
 		work_baseband.size()
@@ -80,8 +80,8 @@ buffer_c16_t ChannelDecimator::execute_decimation(buffer_c8_t buffer) {
 }
 
 buffer_c16_t ChannelDecimator::execute_stage_0(
-	buffer_c8_t buffer,
-	buffer_c16_t work_baseband_buffer
+	const buffer_c8_t& buffer,
+	const buffer_c16_t& work_baseband_buffer
 ) {
 	if( fs_over_4_downconvert ) {
 		return translate.execute(buffer, work_baseband_buffer);

firmware/baseband/channel_decimator.hpp

@@ -57,7 +57,7 @@ public:
 		decimation_factor = f;
 	}
 
-	buffer_c16_t execute(buffer_c8_t buffer) {
+	buffer_c16_t execute(const buffer_c8_t& buffer) {
 		auto decimated = execute_decimation(buffer);
 
 		return decimated;
@@ -76,11 +76,11 @@ private:
 	DecimationFactor decimation_factor;
 	const bool fs_over_4_downconvert;
 
-	buffer_c16_t execute_decimation(buffer_c8_t buffer);
+	buffer_c16_t execute_decimation(const buffer_c8_t& buffer);
 
 	buffer_c16_t execute_stage_0(
-		buffer_c8_t buffer,
-		buffer_c16_t work_baseband_buffer
+		const buffer_c8_t& buffer,
+		const buffer_c16_t& work_baseband_buffer
 	);
 };
 

firmware/baseband/channel_stats_collector.hpp

@@ -34,7 +34,7 @@
 class ChannelStatsCollector {
 public:
 	template<typename Callback>
-	void feed(buffer_c16_t src, Callback callback) {
+	void feed(const buffer_c16_t& src, Callback callback) {
 		auto src_p = src.p;
 		while(src_p < &src.p[src.count]) {
 			const uint32_t sample = *__SIMD32(src_p)++;

firmware/baseband/proc_ais.cpp

@@ -26,7 +26,7 @@
 #include "i2s.hpp"
 using namespace lpc43xx;
 
-void AISProcessor::execute(buffer_c8_t& buffer) {
+void AISProcessor::execute(const buffer_c8_t& buffer) {
 	/* 2.4576MHz, 2048 samples */
 
 	auto decimator_out = decimator.execute(buffer);

firmware/baseband/proc_ais.hpp

@@ -42,7 +42,7 @@
 
 class AISProcessor : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By32 };

firmware/baseband/proc_am_audio.cpp

@@ -23,7 +23,7 @@
 
 #include <cstdint>
 
-void NarrowbandAMAudio::execute(buffer_c8_t& buffer) {
+void NarrowbandAMAudio::execute(const buffer_c8_t& buffer) {
 	auto decimator_out = decimator.execute(buffer);
 
 	const buffer_c16_t work_baseband_buffer {

firmware/baseband/proc_am_audio.hpp

@@ -38,7 +38,7 @@ public:
 		channel_filter.configure(channel_filter_taps.taps, 2);
 	}
 
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator;

firmware/baseband/proc_ert.cpp

@@ -41,7 +41,7 @@ float ERTProcessor::abs(const complex8_t& v) {
 	return std::sqrt(r2_i2);
 }
 
-void ERTProcessor::execute(buffer_c8_t& buffer) {
+void ERTProcessor::execute(const buffer_c8_t& buffer) {
 	/* 4.194304MHz, 2048 samples */
 	// auto decimator_out = decimator.execute(buffer);
 

firmware/baseband/proc_ert.hpp

@@ -50,7 +50,7 @@ constexpr size_t idm_payload_length_max { 1408 };
 
 class ERTProcessor : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	const uint32_t baseband_sampling_rate = 4194304;

firmware/baseband/proc_nfm_audio.cpp

@@ -24,7 +24,7 @@
 #include <cstdint>
 #include <cstddef>
 
-void NarrowbandFMAudio::execute(buffer_c8_t& buffer) {
+void NarrowbandFMAudio::execute(const buffer_c8_t& buffer) {
 	/* Called every 2048/3072000 second -- 1500Hz. */
 
 	auto decimator_out = decimator.execute(buffer);

firmware/baseband/proc_nfm_audio.hpp

@@ -39,7 +39,7 @@ public:
 		channel_filter.configure(channel_filter_taps.taps, 2);
 	}
 
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator;

firmware/baseband/proc_tpms.cpp

@@ -26,7 +26,7 @@
 #include "i2s.hpp"
 using namespace lpc43xx;
 
-void TPMSProcessor::execute(buffer_c8_t& buffer) {
+void TPMSProcessor::execute(const buffer_c8_t& buffer) {
 	/* 2.4576MHz, 2048 samples */
 
 	auto decimator_out = decimator.execute(buffer);

firmware/baseband/proc_tpms.hpp

@@ -50,7 +50,7 @@ constexpr std::array<std::complex<float>, 8> rect_taps_153k6_1t_p { {
 
 class TPMSProcessor : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 };

firmware/baseband/proc_wfm_audio.cpp

@@ -23,7 +23,7 @@
 
 #include <cstdint>
 
-void WidebandFMAudio::execute(buffer_c8_t& buffer) {
+void WidebandFMAudio::execute(const buffer_c8_t& buffer) {
 	auto decimator_out = decimator.execute(buffer);
 
 	const buffer_s16_t work_audio_buffer {

firmware/baseband/proc_wfm_audio.hpp

@@ -37,7 +37,7 @@ public:
 		decimator.set_decimation_factor(ChannelDecimator::DecimationFactor::By4);
 	}
 
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	ChannelDecimator decimator;

firmware/baseband/proc_wideband_spectrum.cpp

@@ -33,7 +33,7 @@ using namespace lpc43xx;
 
 #include <array>
 
-void WidebandSpectrum::execute(buffer_c8_t& buffer) {
+void WidebandSpectrum::execute(const buffer_c8_t& buffer) {
 	// 2048 complex8_t samples per buffer.
 	// 102.4us per buffer. 20480 instruction cycles per buffer.
 

firmware/baseband/proc_wideband_spectrum.hpp

@@ -30,7 +30,7 @@
 
 class WidebandSpectrum : public BasebandProcessor {
 public:
-	void execute(buffer_c8_t& buffer) override;
+	void execute(const buffer_c8_t& buffer) override;
 
 private:
 	size_t sample_count = 0;

firmware/baseband/rssi_stats_collector.hpp

@@ -31,7 +31,7 @@
 class RSSIStatisticsCollector {
 public:
 	template<typename Callback>
-	void process(rf::rssi::buffer_t buffer, Callback callback) {
+	void process(const rf::rssi::buffer_t& buffer, Callback callback) {
 		auto p = buffer.p;
 		if( p == nullptr ) {
 			return;