Fixed ADSB TX frame rotation

firmware/application/main.cpp

@@ -23,17 +23,15 @@
 // Color bitmaps generated with:
 // Gimp image > indexed colors (16), then "xxd -i *.bmp"
 
-//TEST: ADS-B tx manchester encoder, velocity and squawk frames
+//TEST: ADS-B tx velocity and squawk frames
 //TEST: Menuview refresh, seems to blink a lot
 //TEST: Check AFSK transmit end, skips last bits ?
 //TEST: Imperial in whipcalc
 
-//BUG: ADSB transmit baseband code works only if stuck in a loop (txdone message makes everything go nuts)
 //BUG: CPLD-related rx ok, tx bad, see portapack.cpp lines 214+ to disable CPLD overlay
 //BUG: REPLAY See what's wrong with quality (format, or need for interpolation filter ?)
 //BUG: SCANNER Lock on frequency, if frequency jump, still locked on first one
 //BUG: SCANNER Multiple slices
-//BUG: REPLAY freezes when SD card not present
 //BUG: RDS doesn't stop baseband when stopping tx ?
 
 //TODO: REPLAY Convert C16 to C8 on M0 core

firmware/application/ui_adsb_tx.cpp

@@ -118,6 +118,8 @@ ADSBPositionView::ADSBPositionView(NavigationView& nav) {
 }
 
 void ADSBPositionView::collect_frames(const uint32_t ICAO_address, std::vector<ADSBFrame>& frame_list) {
+	if (!enabled) return;
+	
 	ADSBFrame temp_frame;
 	
 	encode_frame_pos(temp_frame, ICAO_address, geopos.altitude(),
@@ -149,6 +151,8 @@ ADSBCallsignView::ADSBCallsignView(NavigationView& nav) {
 }
 
 void ADSBCallsignView::collect_frames(const uint32_t ICAO_address, std::vector<ADSBFrame>& frame_list) {
+	if (!enabled) return;
+	
 	ADSBFrame temp_frame;
 	
 	encode_frame_id(temp_frame, ICAO_address, callsign);
@@ -175,6 +179,8 @@ ADSBSpeedView::ADSBSpeedView() {
 }
 
 void ADSBSpeedView::collect_frames(const uint32_t ICAO_address, std::vector<ADSBFrame>& frame_list) {
+	if (!enabled) return;
+	
 	ADSBFrame temp_frame;
 	
 	encode_frame_velo(temp_frame, ICAO_address, field_speed.value(),
@@ -193,6 +199,8 @@ ADSBSquawkView::ADSBSquawkView() {
 }
 
 void ADSBSquawkView::collect_frames(const uint32_t ICAO_address, std::vector<ADSBFrame>& frame_list) {
+	if (!enabled) return;
+	
 	ADSBFrame temp_frame;
 	(void)ICAO_address;
 	
@@ -201,83 +209,35 @@ void ADSBSquawkView::collect_frames(const uint32_t ICAO_address, std::vector<ADS
 	frame_list.emplace_back(temp_frame);
 }
 
-void ADSBTxView::focus() {
+ADSBTXThread::ADSBTXThread(
-	tab_view.focus();
+	std::vector<ADSBFrame> frames
+) : frames_ {  std::move(frames) }
+{
+	thread = chThdCreateFromHeap(NULL, 1024, NORMALPRIO + 10, ADSBTXThread::static_fn, this);
 }
 
-ADSBTxView::~ADSBTxView() {
+ADSBTXThread::~ADSBTXThread() {
-	transmitter_model.disable();
+	if( thread ) {
-	baseband::shutdown();
+		chThdTerminate(thread);
-}
+		chThdWait(thread);
-
+		thread = nullptr;
-void ADSBTxView::generate_frames() {
-	const uint32_t ICAO_address = sym_icao.value_hex_u64();
-	
-	/* This scheme kinda sucks. Each "tab"'s collect_frames method
-	 * is called to generate its related frame(s). Getting values
-	 * from each widget of each tab would be better ?
-	 * */
-	view_position.collect_frames(ICAO_address, frames);
-	view_callsign.collect_frames(ICAO_address, frames);
-	view_speed.collect_frames(ICAO_address, frames);
-	view_squawk.collect_frames(ICAO_address, frames);
-	
-	// DEBUG: Show how many frames were generated
-	text_frame.set(to_string_dec_uint(frames.size()) + " frame(s).");
-
-	//memset(bin_ptr, 0, 240);
-
-	//auto raw_ptr = frames[0].get_raw_data();
-	
-	// The preamble isn't manchester encoded
-	//memcpy(bin_ptr, adsb_preamble, 16);
-	
-	// Convert to binary with manchester encoding (1 byte per bit, faster for baseband code)
-	/*for (c = 0; c < 112; c++) {
-		if ((raw_ptr[c >> 3] << (c & 7)) & 0x80) {
-			bin_ptr[(c * 2) + 16] = 1;
-			bin_ptr[(c * 2) + 16 + 1] = 0;
-		} else {
-			bin_ptr[(c * 2) + 16] = 0;
-			bin_ptr[(c * 2) + 16 + 1] = 1;
 	}
-	}*/
-	
-	/*manchester_encode(bin_ptr + 16, raw_ptr, 112, 0);
-	
-	// Display in hex for debug
-	text_frame.set(to_string_hex_array(frames[0].get_raw_data(), 14));
-
-	button_callsign.set_text(callsign);*/
 }
 
-void ADSBTxView::start_tx() {
+msg_t ADSBTXThread::static_fn(void* arg) {
-	generate_frames();
+	auto obj = static_cast<ADSBTXThread*>(arg);
-	
+	obj->run();
-	transmitter_model.set_sampling_rate(4000000U);
+	return 0;
-	transmitter_model.set_rf_amp(true);
-	transmitter_model.set_baseband_bandwidth(10000000);
-	transmitter_model.enable();
-	
-	baseband::set_adsb();
 }
 
-void ADSBTxView::on_txdone(const bool v) {
+void ADSBTXThread::run() {
-	(void)v;
-	/*if (v) {
-		transmitter_model.disable();
-		tx_view.set_transmitting(false);
-	}*/
-}
-
-void ADSBTxView::rotate_frames() {
 	uint8_t * bin_ptr = shared_memory.bb_data.data;
 	uint8_t * raw_ptr;
 	uint32_t frame_index = 0;	//, plane_index = 0;
-	uint32_t c;	//, regen = 0;
+	//uint32_t regen = 0;
 	//float offs = 0;
 	
-	for (;;) {
+	while( !chThdShouldTerminate() ) {
 		/*if (!regen) {
 			regen = 10;
 			
@@ -294,28 +254,24 @@ void ADSBTxView::rotate_frames() {
 			offs += 0.001;
 		}*/
 		
-		memset(bin_ptr, 0, 240);
+		memset(bin_ptr, 0, 256);	// 112 bits * 2 parts = 224 should be enough
 		
-		raw_ptr = frames[frame_index].get_raw_data();
+		raw_ptr = frames_[frame_index].get_raw_data();
 		
+		// The preamble isn't manchester encoded
 		memcpy(bin_ptr, adsb_preamble, 16);
 		
 		// Convert to binary (1 byte per bit, faster for baseband code)
-		for (c = 0; c < 112; c++) {
+		manchester_encode(bin_ptr + 16, raw_ptr, 112, 0);
-			if ((raw_ptr[c >> 3] << (c & 7)) & 0x80) {
+	
-				bin_ptr[(c * 2) + 16] = 1;
+		// Display in hex for debug
-				bin_ptr[(c * 2) + 16 + 1] = 0;
+		//text_frame.set(to_string_hex_array(frames[0].get_raw_data(), 14));
-			} else {
-				bin_ptr[(c * 2) + 16] = 0;
-				bin_ptr[(c * 2) + 16 + 1] = 1;
-			}
-		}
 	
 		baseband::set_adsb();
 		
 		chThdSleepMilliseconds(50);
 		
-		if (frame_index == frames.size()) {
+		if (frame_index == frames_.size()) {
 			frame_index = 0;
 			//if (regen)
 			//	regen--;
@@ -325,6 +281,46 @@ void ADSBTxView::rotate_frames() {
 	}
 }
 
+void ADSBTxView::focus() {
+	tab_view.focus();
+}
+
+ADSBTxView::~ADSBTxView() {
+	transmitter_model.disable();
+	baseband::shutdown();
+}
+
+void ADSBTxView::generate_frames() {
+	const uint32_t ICAO_address = sym_icao.value_hex_u64();
+	
+	frames.clear();
+	
+	/* This scheme kinda sucks. Each "tab"'s collect_frames method
+	 * is called to generate its related frame(s). Getting values
+	 * from each widget of each tab would be better ?
+	 * */
+	view_position.collect_frames(ICAO_address, frames);
+	view_callsign.collect_frames(ICAO_address, frames);
+	view_speed.collect_frames(ICAO_address, frames);
+	view_squawk.collect_frames(ICAO_address, frames);
+	
+	// Show how many frames were generated
+	//text_frame.set(to_string_dec_uint(frames.size()) + " frame(s).");
+}
+
+void ADSBTxView::start_tx() {
+	generate_frames();
+	
+	transmitter_model.set_sampling_rate(4000000U);
+	transmitter_model.set_rf_amp(true);
+	transmitter_model.set_baseband_bandwidth(10000000);
+	transmitter_model.enable();
+	
+	baseband::set_adsb();
+	
+	tx_thread = std::make_unique<ADSBTXThread>(frames);
+}
+
 ADSBTxView::ADSBTxView(
 	NavigationView& nav
 ) : nav_ { nav }
@@ -349,11 +345,16 @@ ADSBTxView::ADSBTxView(
 	view_speed.set_parent_rect(view_rect);
 	view_squawk.set_parent_rect(view_rect);
 	
+	tx_view.on_edit_frequency = [this, &nav]() {
+		auto new_view = nav.push<FrequencyKeypadView>(receiver_model.tuning_frequency());
+		new_view->on_changed = [this](rf::Frequency f) {
+			transmitter_model.set_tuning_frequency(f);
+		};
+	};
+	
 	tx_view.on_start = [this]() {
 		start_tx();
 		tx_view.set_transmitting(true);
-		// Disable for DEBUG
-		//rotate_frames();
 	};
 	
 	tx_view.on_stop = [this]() {

firmware/application/ui_adsb_tx.hpp

@@ -152,6 +152,25 @@ private:
 	};
 };
 
+class ADSBTXThread {
+public:
+	ADSBTXThread(std::vector<ADSBFrame> frames);
+	~ADSBTXThread();
+
+	ADSBTXThread(const ADSBTXThread&) = delete;
+	ADSBTXThread(ADSBTXThread&&) = delete;
+	ADSBTXThread& operator=(const ADSBTXThread&) = delete;
+	ADSBTXThread& operator=(ADSBTXThread&&) = delete;
+
+private:
+	std::vector<ADSBFrame> frames_ { };
+	Thread* thread { nullptr };
+
+	static msg_t static_fn(void* arg);
+	
+	void run();
+};
+
 class ADSBTxView : public View {
 public:
 	ADSBTxView(NavigationView& nav);
@@ -203,8 +222,6 @@ private:
 	
 	void start_tx();
 	void generate_frames();
-	void rotate_frames();
-	void on_txdone(const bool v);
 	
 	ADSBPositionView view_position { nav_ };
 	ADSBCallsignView view_callsign { nav_ };
@@ -239,13 +256,7 @@ private:
 		0
 	};
 	
-	MessageHandlerRegistration message_handler_tx_done {
+	std::unique_ptr<ADSBTXThread> tx_thread { };
-		Message::ID::TXDone,
-		[this](const Message* const p) {
-			const auto message = *reinterpret_cast<const TXDoneMessage*>(p);
-			this->on_txdone(message.done);
-		}
-	};
 };
 
 } /* namespace ui */

firmware/baseband/proc_adsbtx.cpp

@@ -37,54 +37,14 @@ void ADSBTXProcessor::execute(const buffer_c8_t& buffer) {
 	
 	if (!configured) return;
 
-	/*if (terminate) {
 	for (size_t i = 0; i < buffer.count; i++) {
-			buffer.p[i] = { 0, 0 };
-		}
-		terminate--;
-		if (!terminate) {
-			message.done = true;
-			shared_memory.application_queue.push(message);
-			configured = false;
-			return;
-		}
-	} else {*/
-	
-		for (size_t i = 0; i < buffer.count; i++) {
-			
-			/*if (active) {
-				if (!sample) {
-					sample = 300;
-					if (bit_pos >= 112) {
-						active = false;	// Stop
-						cur_bit = 0;
-					} else {
-						cur_bit = shared_memory.bb_data.data[bit_pos];
-						bit_pos++;
-					}
-				} else
-					sample--;
-				
-				if (!preamble) {
-					if (sample == 150)
-						cur_bit ^= 1;	// Invert
-				}
-			} else {*/
-				/*cur_bit = 0;
-				if (bit_pos >= 16384) {
-					configured = false;
-					message.done = true;
-					shared_memory.application_queue.push(message);
-				}*/
 		if (bit_pos >= (240 << 1)) {
 			configured = false;
-					terminate = 100;
 			cur_bit = 0;
 		} else {
 			cur_bit = shared_memory.bb_data.data[bit_pos >> 1];
 			bit_pos++;
 		}
-			//}
 		
 		if (cur_bit) {
 			// Crude AM
@@ -94,7 +54,6 @@ void ADSBTXProcessor::execute(const buffer_c8_t& buffer) {
 			buffer.p[i] = { 0, 0 };
 		}
 	}
-	//}
 }
 
 void ADSBTXProcessor::on_message(const Message* const p) {
@@ -103,9 +62,7 @@ void ADSBTXProcessor::on_message(const Message* const p) {
 	if (message.id == Message::ID::ADSBConfigure) {
 		bit_pos = 0;
 		phase = 0;
-		active = true;
 		configured = true;
-		terminate = 0;
 	}
 }
 

firmware/baseband/proc_adsbtx.hpp

@@ -44,8 +44,6 @@ private:
 		{ 0, -127 }		
 	};
 	
-	bool active { };
-	uint32_t terminate { };
     uint32_t bit_pos { 0 };
     uint32_t cur_bit { 0 };
 	uint32_t phase { 0 };

firmware/common/manchester.cpp

@@ -70,13 +70,16 @@ FormattedSymbols format_symbols(
 	return { hex_data, hex_error };
 }
 
-void manchester_encode(uint8_t * dest, uint8_t * src, size_t length, const size_t sense) {
+void manchester_encode(uint8_t * dest, uint8_t * src, const size_t length, const size_t sense) {
-	uint_fast8_t part = sense ? 0 : 0xFF;
+	uint8_t part = sense ? 0 : 0xFF;
 	
 	for (size_t c = 0; c < length; c++) {
 		if ((src[c >> 3] << (c & 7)) & 0x80) {
 			*(dest++) = part;
 			*(dest++) = ~part;
+		} else {
+			*(dest++) = ~part;
+			*(dest++) = part;
 		}
 	}
 }

firmware/common/manchester.hpp

@@ -67,6 +67,6 @@ FormattedSymbols format_symbols(
 	const ManchesterDecoder& decoder
 );
 
-void manchester_encode(uint8_t * dest, uint8_t * src, size_t length, const size_t sense = 0);
+void manchester_encode(uint8_t * dest, uint8_t * src, const size_t length, const size_t sense = 0);
 
 #endif/*__MANCHESTER_H__*/