Fixed LCR transmit and AFSK baseband module

firmware/baseband/proc_afsk.cpp

@@ -0,0 +1,144 @@
+/*
+ * 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_afsk.hpp"
+#include "portapack_shared_memory.hpp"
+#include "sine_table_int8.hpp"
+#include "event_m4.hpp"
+
+#include <cstdint>
+
+void AFSKProcessor::execute(const buffer_c8_t& buffer) {
+	
+	// This is called at 2280000/2048 = 1113Hz
+	
+	if (!configured) return;
+	
+	for (size_t i = 0; i<buffer.count; i++) {
+		
+		// Tone generation at 2280000/10 = 228kHz
+		if (s >= (10 - 1)) {
+			s = 0;
+			
+			if (sample_count >= afsk_samples_per_bit) {
+				if (configured == true) {
+					cur_byte = message_data[byte_pos];
+					ext_byte = message_data[byte_pos + 1];
+				}
+				if (!cur_byte) {
+					if (afsk_repeat) {
+						afsk_repeat--;
+						bit_pos = 0;
+						byte_pos = 0;
+						cur_byte = message_data[0];
+						ext_byte = message_data[1];
+						message.n = afsk_repeat;
+						shared_memory.application_queue.push(message);
+					} else {
+						message.n = 0;
+						configured = false;
+						shared_memory.application_queue.push(message);
+						cur_byte = 0;
+						ext_byte = 0;
+					}
+				}
+				
+				if (afsk_alt_format) {
+					// 0bbbbbbbbp
+					// Start, 8-bit data, parity
+					gbyte = 0;
+					gbyte = cur_byte << 1;
+					gbyte |= (ext_byte & 1);
+				} else {
+					// 0bbbbbbbp1
+					// Start, 7-bit data, parity, stop
+					gbyte = 0;
+					gbyte = cur_byte << 1;
+					gbyte |= 1;
+				}
+				
+				cur_bit = (gbyte >> (9 - bit_pos)) & 1;
+
+				if (bit_pos == 9) {
+					bit_pos = 0;
+					if (!afsk_alt_format)
+						byte_pos++;
+					else
+						byte_pos += 2;
+				} else {
+					bit_pos++;
+				}
+				
+				sample_count = 0;
+			} else {
+				sample_count++;
+			}
+			if (cur_bit)
+				tone_phase += afsk_phase_inc_mark;
+			else
+				tone_phase += afsk_phase_inc_space;
+		} else {
+			s++;
+		}
+		
+		tone_sample = (sine_table_i8[(tone_phase & 0x03FC0000)>>18]); 
+		
+		// FM
+		// 1<<18 = 262144
+		// m = (262144 * BW) / 2280000 (* 115, see ui_lcr afsk_bw setting)
+		frq = tone_sample * afsk_bw;
+		
+		phase = (phase + frq);
+		sphase = phase + (64<<18);
+
+		re = (sine_table_i8[(sphase & 0x03FC0000)>>18]);
+		im = (sine_table_i8[(phase & 0x03FC0000)>>18]);
+		
+		buffer.p[i] = {(int8_t)re,(int8_t)im};
+	}
+}
+
+void AFSKProcessor::on_message(const Message* const p) {
+	const auto message = *reinterpret_cast<const AFSKConfigureMessage*>(p);
+	if (message.id == Message::ID::AFSKConfigure) {
+		memcpy(message_data, message.message_data, 256);
+		afsk_samples_per_bit = message.afsk_samples_per_bit;
+		afsk_phase_inc_mark = message.afsk_phase_inc_mark;
+		afsk_phase_inc_space = message.afsk_phase_inc_space;
+		afsk_repeat = message.afsk_repeat;
+		afsk_bw = message.afsk_bw;
+		afsk_alt_format = message.afsk_alt_format;
+	
+		bit_pos = 0;
+		byte_pos = 0;
+		cur_byte = 0;
+		ext_byte = 0;
+		cur_bit = 0;
+		configured = true;
+	}
+}
+
+int main() {
+	EventDispatcher event_dispatcher { std::make_unique<AFSKProcessor>() };
+	event_dispatcher.run();
+	return 0;
+}