Reused ACT (led0) light as activity light.

Controller.cpp

@@ -2,6 +2,7 @@
 #include "u2f.hpp"
 #include <iostream>
 #include "IO.hpp"
+#include "LED.hpp"
 
 using namespace std;
 
@@ -11,11 +12,18 @@ Controller::Controller(const uint32_t startChannel)
 
 void Controller::handleTransaction()
 {
+	if (channels.size() != 0 && chrono::duration_cast<chrono::seconds>(chrono::system_clock::now() - lastMessage) < 5s)
+		toggleACTLED();
+	else
+		enableACTLED(false);
+
 	auto msg = U2FMessage::readNonBlock();
 
 	if (!msg)
 		return;
 	
+	lastMessage = chrono::system_clock::now();
+
 	auto opChannel = msg->cid;
 
 	if (msg->cmd == U2FHID_INIT)

Controller.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <map>
+#include <chrono>
 #include "Channel.hpp"
 
 class Controller
@@ -7,6 +8,7 @@ class Controller
 	protected:
 		std::map<uint32_t, Channel>               channels;
 		uint32_t                                  currChannel;
+		std::chrono::system_clock::time_point     lastMessage; 
 
 	public:
 		Controller(const uint32_t startChannel = 1);

LED.cpp

@@ -0,0 +1,49 @@
+#include "LED.hpp"
+#include <fstream>
+#include <stdexcept>
+#include <string>
+
+using namespace std;
+
+bool& ledState()
+{
+	static bool state = true;
+	return state;
+}
+
+bool getLEDState()
+{
+	return ledState();
+}
+
+void disableACTTrigger(bool nowDisabled)
+{
+	ofstream trigFile{ "/sys/class/leds/led0/trigger", ofstream::out | ofstream::trunc };
+
+	if (!trigFile)
+		throw runtime_error{ "Failed to retrieve led0 trigger file" };
+
+	if (!static_cast<bool>(trigFile << (nowDisabled ? "none" : "mmc0")))
+		throw runtime_error{ "Failed to write led0 trigger to file" };
+}
+
+void enableACTLED(bool nowOn)
+{
+	if (nowOn == getLEDState())
+		return;
+
+	ofstream enabledFile{ "/sys/class/leds/led0/brightness", ofstream::out | ofstream::trunc };
+
+	if (!enabledFile)
+		throw runtime_error{ "Failed to retrieve led0 brightness" };
+
+	if (!static_cast<bool>(enabledFile << to_string(nowOn ? 0 : 1)))
+		throw runtime_error{ "Failed to write led0 brightness to file" };
+
+	ledState() = nowOn;
+}
+
+void toggleACTLED()
+{
+	enableACTLED(!getLEDState());
+}

LED.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+bool getLEDState();
+void disableACTTrigger(bool nowDisabled);
+void enableACTLED(bool nowOn);
+void toggleACTLED();

monitor.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include "Storage.hpp"
 #include "Controller.hpp"
+#include "LED.hpp"
 #include <signal.h>
 #include <unistd.h>
 
@@ -12,6 +13,16 @@ volatile bool contProc = true;
 
 int main()
 {
+	try
+	{
+		disableACTTrigger(true);
+		enableACTLED(false);
+	}
+	catch (runtime_error &e)
+	{
+		cerr << e.what() << endl;
+	}
+
 	signal(SIGINT, signalCallback);
 	Storage::init();
 
@@ -25,11 +36,21 @@ int main()
 
 	Storage::save();
 
+	try
+	{
+		disableACTTrigger(false);
+		enableACTLED(true);
+	}
+	catch (runtime_error &e)
+	{
+		cerr << e.what() << endl;
+	}
+
 	return EXIT_SUCCESS;
 }
 
 void signalCallback([[maybe_unused]] int signum)
 {
 	contProc = false;
-	clog << "Caught SIGINT signal" << endl;
+	clog << "\nCaught SIGINT signal" << endl;
 }