Started work on ADS-B TX baseband processor

firmware/baseband/CMakeLists.txt

@@ -342,10 +342,10 @@ DeclareTargets(POOK ook)
 
 ### Jammer
 
-#set(MODE_CPPSRC
-#	proc_jammer.cpp
-#)
-#DeclareTargets(PJAM jammer)
+set(MODE_CPPSRC
+	proc_jammer.cpp
+)
+DeclareTargets(PJAM jammer)
 
 ### Audio transmit
 
@@ -389,6 +389,13 @@ set(MODE_CPPSRC
 )
 DeclareTargets(PRDS rds)
 
+### ADS-B TX
+
+set(MODE_CPPSRC
+	proc_adsbtx.cpp
+)
+DeclareTargets(PADS ads)
+
 ### HackRF "factory" firmware
 
 add_custom_command(

firmware/baseband/proc_adsbtx.cpp

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ *
+ * 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_adsbtx.hpp"
+#include "portapack_shared_memory.hpp"
+#include "sine_table_int8.hpp"
+#include "event_m4.hpp"
+
+#include <cstdint>
+
+void ADSBTXProcessor::execute(const buffer_c8_t& buffer) {
+	
+	// This is called at 2M/2048 = 977Hz
+	
+	if (!configured) return;
+	
+	for (size_t i = 0; i < buffer.count; i++) {
+		
+		// Synthesis at 2M
+		/*if (preamble == true) {
+			if (bit_pos >= 16) {
+				bit_pos = 0;
+				preamble = false;
+				bit_part = 0;
+			} else {
+				cur_bit = (preamble_parts << bit_pos) >> 15;
+				bit_pos++;
+			}
+		}*/
+		//if (preamble == false) {
+			if (!bit_part) {
+				if (bit_pos >= 112) {
+					// Stop
+					cur_bit = 0;
+				} else {
+					cur_bit = shared_memory.tx_data[bit_pos];
+					bit_pos++;
+					bit_part = 1;
+				}
+			} else {
+				bit_part = 0;
+				cur_bit ^= 1;
+			}
+		//}
+		
+		// 8D48: 10001101 01001000
+		//       1001010110100110 0110010110010101
+		
+		if (cur_bit) {
+			phase = (phase + 0x1FE0000);			// What ?
+			sphase = phase + (64 << 18);
+
+			re = (sine_table_i8[(sphase & 0x03FC0000) >> 18]);
+			im = (sine_table_i8[(phase & 0x03FC0000) >> 18]);
+		} else {
+			re = 0;
+			im = 0;
+		}
+	
+		buffer.p[i] = {(int8_t)re, (int8_t)im};
+	}
+	
+	// TEST
+	message.n = 200;
+	shared_memory.application_queue.push(message);
+	configured = false;
+}
+
+void ADSBTXProcessor::on_message(const Message* const p) {
+	const auto message = *reinterpret_cast<const ADSBConfigureMessage*>(p);
+	
+	if (message.id == Message::ID::ADSBConfigure) {
+		bit_pos = 0;
+		cur_bit = 0;
+		preamble = true;
+		configured = true;
+	}
+}
+
+int main() {
+	EventDispatcher event_dispatcher { std::make_unique<ADSBTXProcessor>() };
+	event_dispatcher.run();
+	return 0;
+}

firmware/baseband/proc_adsbtx.hpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ *
+ * 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_ADSBTX_H__
+#define __PROC_ADSBTX_H__
+
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+
+class ADSBTXProcessor : public BasebandProcessor {
+public:
+	void execute(const buffer_c8_t& buffer) override;
+	
+	void on_message(const Message* const p) override;
+
+private:
+	bool configured = false;
+	
+	BasebandThread baseband_thread { 2000000, this, NORMALPRIO + 20, baseband::Direction::Transmit };	// 2280000
+	
+	const uint16_t preamble_parts = 0b1010000101000000;
+	uint8_t bit_part;
+	bool preamble;
+	int8_t re, im;
+    uint16_t bit_pos = 0;
+    uint8_t cur_bit = 0;
+	uint32_t phase, sphase;
+	int32_t sig, frq;
+	
+	TXDoneMessage message;
+};
+
+#endif

firmware/baseband/proc_jammer.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
@@ -21,7 +22,7 @@
 
 #include "proc_jammer.hpp"
 #include "portapack_shared_memory.hpp"
-#include "sine_table.hpp"
+#include "sine_table_int8.hpp"
 #include "event_m4.hpp"
 
 #include <cstdint>
@@ -29,6 +30,9 @@
 #define POLY_MASK_32 0xB4BCD35C
 
 void JammerProcessor::execute(const buffer_c8_t& buffer) {
+	
+	if (!configured) return;
+	
 	for (size_t i = 0; i<buffer.count; i++) {
 
 		if (s >= 10000) {	//shared_memory.jammer_ranges[ir].duration
@@ -66,21 +70,68 @@ void JammerProcessor::execute(const buffer_c8_t& buffer) {
 		}
 		
 		aphase += 8830;
-		sample = sine_table_f32[(aphase & 0x03FF0000)>>18]*256;
+		sample = sine_table_i8[(sphase & 0x03FC0000) >> 18];
 		
-		//FM
-		frq = sample * jammer_bw;		// Bandwidth
+		// FM
+		frq = sample * jammer_bw;
 		
 		phase = (phase + frq);
-		sphase = phase + (256<<16);
+		sphase = phase + (64 << 18);
 
-		re = sine_table_f32[(sphase & 0x03FF0000)>>18]*127;
-		im = sine_table_f32[(phase & 0x03FF0000)>>18]*127;
+		re = (sine_table_i8[(sphase & 0x03FC0000) >> 18]);
+		im = (sine_table_i8[(phase & 0x03FC0000) >> 18]);
 		
-		buffer.p[i] = {(int8_t)re,(int8_t)im};
+		buffer.p[i] = {(int8_t)re, (int8_t)im};
 	}
 };
 
+void JammerProcessor::on_message(const Message* const msg) {
+	/*const auto message = *reinterpret_cast<const DTMFTXConfigMessage*>(msg);
+	
+	if (message.id == Message::ID::DTMFTXConfig) {
+		
+		// Translate DTMF message to index in DTMF frequencies table
+		tone_ptr = &shared_memory.tx_data[0];
+		for (;;) {
+			tone_code = *tone_ptr;
+			if (tone_code == 0xFF)
+				break;				// End of message
+			else if (tone_code <= 9)
+				// That's already fine bro.
+				*tone_ptr = tone_code;
+			else if (tone_code == 'A')
+				*tone_ptr = 10;
+			else if (tone_code == 'B')
+				*tone_ptr = 11;
+			else if (tone_code == 'C')
+				*tone_ptr = 12;
+			else if (tone_code == 'D')
+				*tone_ptr = 13;
+			else if (tone_code == '#')
+				*tone_ptr = 14;
+			else if (tone_code == '*')
+				*tone_ptr = 15;
+			else {
+				*tone_ptr = 0xFF;	// Invalid character, stop here
+			}
+			tone_ptr++;
+		}
+		
+		// 1<<18 = 262144
+		// m = (262144 * a) / 1536000
+		// a = 262144 / 1536000 (*1000 = 171)
+		bw = 171 * (message.bw);
+		tone_length = message.tone_length * 154;		// 153.6
+		pause_length = message.pause_length * 154;		// 153.6
+		as = 0;
+		tone = false;
+		timer = 0;
+		tone_idx = 0;
+
+		configured = true;
+	}*/
+}
+
 int main() {
 	EventDispatcher event_dispatcher { std::make_unique<JammerProcessor>() };
 	event_dispatcher.run();

firmware/baseband/proc_jammer.hpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
@@ -28,8 +29,14 @@
 class JammerProcessor : public BasebandProcessor {
 public:
 	void execute(const buffer_c8_t& buffer) override;
+	
+	void on_message(const Message* const msg) override;
 
 private:
+	bool configured = false;
+	
+	BasebandThread baseband_thread { 1536000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
+	
     int32_t lfsr32 = 0xABCDE;
     uint32_t s;
 	int8_t r, ir, re, im;