Push packet timestamping earlier in packet handling.

Ideally, it'd get pushed back into baseband, and baseband would correct for the length of the packet (based on preamble/access code match timestamp minus preamble/access code duration) to give the exact time the packet started.

firmware/application/app_ais.cpp

@@ -220,6 +220,10 @@ bool Packet::is_valid() const {
 	return true;
 }
 
+rtc::RTC Packet::received_at() const {
+	return received_at_;
+}
+
 uint32_t Packet::message_id() const {
 	return field_.read(0, 6);
 }
@@ -303,7 +307,7 @@ bool AISModel::on_packet(const baseband::ais::Packet& packet) {
 			entry += (nibble >= 10) ? ('W' + nibble) : ('0' + nibble);
 		}
 
-		log_file.write_entry(entry);
+		log_file.write_entry(packet.received_at(), entry);
 	}
 
 	return true;
@@ -318,7 +322,9 @@ void AISView::on_show() {
 	message_map.register_handler(Message::ID::AISPacket,
 		[this](Message* const p) {
 			const auto message = static_cast<const AISPacketMessage*>(p);
-			const baseband::ais::Packet packet { message->packet.payload, message->packet.bits_received };
+			rtc::RTC datetime;
+			rtcGetTime(&RTCD1, &datetime);
+			const baseband::ais::Packet packet { datetime, message->packet.payload, message->packet.bits_received };
 			if( this->model.on_packet(packet) ) {
 				this->log(packet);
 			}

firmware/application/app_ais.hpp

@@ -27,6 +27,9 @@
 #include "log_file.hpp"
 #include "field_reader.hpp"
 
+#include "lpc43xx_cpp.hpp"
+using namespace lpc43xx;
+
 #include <cstdint>
 #include <cstddef>
 #include <string>
@@ -61,10 +64,12 @@ using MMSI = uint32_t;
 class Packet {
 public:
 	constexpr Packet(
+		const rtc::RTC& received_at,
 		const std::bitset<1024>& payload,
 		const size_t payload_length
 	) : payload_ { payload },
 		payload_length_ { payload_length },
+		received_at_ { received_at },
 		field_ { payload_ }
 	{
 	}
@@ -73,6 +78,8 @@ public:
 	
 	bool is_valid() const;
 
+	rtc::RTC received_at() const;
+
 	uint32_t message_id() const;
 	MMSI user_id() const;
 	MMSI source_id() const;
@@ -89,6 +96,7 @@ public:
 private:
 	const std::bitset<1024> payload_;
 	const size_t payload_length_;
+	const rtc::RTC received_at_;
 	const FieldReader field_;
 };
 

firmware/application/app_ert.cpp

@@ -26,6 +26,9 @@ using namespace portapack;
 
 #include "manchester.hpp"
 
+#include "lpc43xx_cpp.hpp"
+using namespace lpc43xx;
+
 ERTModel::ERTModel() {
 	receiver_model.set_baseband_configuration({
 		.mode = 6,
@@ -38,6 +41,9 @@ ERTModel::ERTModel() {
 }
 
 std::string ERTModel::on_packet(const ERTPacketMessage& message) {
+	rtc::RTC received_at;
+	rtcGetTime(&RTCD1, &received_at);
+
 	std::string entry;
 
 	if( message.packet.preamble == 0x555516a3 ) {
@@ -55,7 +61,7 @@ std::string ERTModel::on_packet(const ERTPacketMessage& message) {
 	entry += hex_formatted.errors;
 
 	if( log_file.is_ready() ) {
-		log_file.write_entry(entry);
+		log_file.write_entry(received_at, entry);
 	}
 
 	return entry;

firmware/application/app_tpms.cpp

@@ -26,6 +26,9 @@ using namespace portapack;
 
 #include "string_format.hpp"
 
+#include "lpc43xx_cpp.hpp"
+using namespace lpc43xx;
+
 TPMSModel::TPMSModel() {
 	receiver_model.set_baseband_configuration({
 		.mode = 5,
@@ -38,6 +41,9 @@ TPMSModel::TPMSModel() {
 }
 
 ManchesterFormatted TPMSModel::on_packet(const TPMSPacketMessage& message) {
+	rtc::RTC received_at;
+	rtcGetTime(&RTCD1, &received_at);
+
 	const ManchesterDecoder decoder(message.packet.payload, message.packet.bits_received, 1);
 	const auto hex_formatted = format_manchester(decoder);
 
@@ -47,7 +53,7 @@ ManchesterFormatted TPMSModel::on_packet(const TPMSPacketMessage& message) {
 		const auto tuning_frequency_str = to_string_dec_uint(tuning_frequency, 10);
 
 		std::string entry = tuning_frequency_str + " FSK 38.4 19.2 " + hex_formatted.data + "/" + hex_formatted.errors;
-		log_file.write_entry(entry);
+		log_file.write_entry(received_at, entry);
 	}
 
 	return hex_formatted;

firmware/application/log_file.cpp

@@ -53,9 +53,7 @@ bool LogFile::is_ready() {
 	return !f_error(&f);
 }
 
-bool LogFile::write_entry(const std::string entry) {
+bool LogFile::write_entry(const rtc::RTC& datetime, const std::string entry) {
-	rtc::RTC datetime;
-	rtcGetTime(&RTCD1, &datetime);
 	std::string timestamp = 
 		to_string_dec_uint(datetime.year(), 4, '0') +
 		to_string_dec_uint(datetime.month(), 2, '0') +

firmware/application/log_file.hpp

@@ -26,6 +26,9 @@
 
 #include "ff.h"
 
+#include "lpc43xx_cpp.hpp"
+using namespace lpc43xx;
+
 class LogFile {
 public:
 	~LogFile();
@@ -34,7 +37,7 @@ public:
 	bool close();
 	bool is_ready();
 
-	bool write_entry(const std::string entry);
+	bool write_entry(const rtc::RTC& datetime, const std::string entry);
 
 private:
 	FIL f;