Added external measure command

defrost.cfg.sample

@@ -1,2 +1,4 @@
-ListenPort = 15000
-LogPath = "/var/log/defrost.log"
+ListenPort = 15000
+LogPath = "/var/log/defrost.log"
+PortAddress = 956
+MeasureCommand = "echo 6.5"

defrost.cpp

@@ -8,19 +8,36 @@
 #include <sstream>
 #include <unistd.h>
 #include <sys/file.h>
+#include <sys/io.h>
 #include <errno.h>
 #include <cmath>
+#include <stdio.h>
 
+const int BASE_DEFAULT = 0x3BC;
 
-void temperature_update()
+string Read(FILE *f)
+{
+	char buffer[256];
+	string result = "";
+	while (fgets(buffer, sizeof(buffer), f) != nullptr)
+	{
+		result += buffer;
+	}
+	return result;
+}
+
+void temperature_update(const string &cmd)
 {
 	// other helper variables
 	float temperature = 1.5; 
+	auto output = popen(cmd.c_str(), "r");
+	if (output == nullptr) return;
+	string value = Read(output);
+	pclose(output);
+	temperature = atof(value.c_str());
 
 	registers[REGISTER_CUR_TEMP] = (int)(temperature * 100);
-	float additional_temperature = 2.5;
-	registers[REGISTER_SECONDARY_TEMP] = (int)(additional_temperature * 100);
-
+	registers[REGISTER_SECONDARY_TEMP] = (int)(temperature * 100);
 }
 
 int main(int argc, char *argv[])
@@ -40,10 +57,25 @@ int main(int argc, char *argv[])
 		}
 		// load config
 		ConfigParser cfg;
-		cfg.Load(argv[1]	);
+		cfg.Load(argv[1]);
 		mainlog.InitLogging(cfg.GetParam("LogPath"), LIBLOGSINGLEFILE, "defrost", true);
 		mainlog.LogString("Defrost service started");
 
+		int port_base = BASE_DEFAULT;
+		auto port_address = cfg.GetParamSilent("PortAddress");
+		if (port_address != "")
+		{
+			port_base = atoi(port_address.c_str());
+		}
+
+		if (ioperm(port_base, 1, 1))
+		{
+			mainlog.LogString("Access to port denied");
+			return EXIT_FAILURE;
+		}
+		
+		string measure_command = cfg.GetParam("MeasureCommand");
+	
 		if (pthread_mutex_init(&register_mutex, NULL) != 0)
 		{
 			mainlog.LogString("Unable to create registers_mutex");
@@ -62,7 +94,7 @@ int main(int argc, char *argv[])
 		while (true)
 		{
 			LockMutex(register_mutex);
-			temperature_update();
+			temperature_update(measure_command);
 			int mode = registers[REGISTER_MODE];
 			if (mode == 0)
 			{
@@ -74,7 +106,7 @@ int main(int argc, char *argv[])
 				io_value = registers[REGISTER_CUR_STATE];
 			}
 			registers[REGISTER_CUR_STATE] = io_value;
-			//gpio.write(io_value);
+			outb(io_value, port_base);
 			ReleaseMutex(register_mutex);
 			sleep(1);
 		}

liblog.cpp

@@ -49,7 +49,7 @@ void LogFile::InitLogging(string logpath, int method, string prefix, bool reopen
 			file = OpenFileWithRetries(filename.str(), "at");
 			if (file == NULL)
 			{
-				throw (string)("Unable to open file for logging");
+				throw (string)("Unable to open file \"" + filename.str() + "\"for logging");
             }
 		}
 		else
@@ -64,8 +64,8 @@ void LogFile::InitLogging(string logpath, int method, string prefix, bool reopen
 			file = OpenFileWithRetries(filename.str(), "at");
 			lastname = filename.str();
 			if (file == NULL)
-			{
-				throw (string)("Unable to open file for logging");
+			{
+				throw (string)("Unable to open file \"" + filename.str() + "\"for logging");
             }
 		}
 	}
@@ -105,8 +105,8 @@ void LogFile::LogString(string s, string pfx)
 			filename << logpath << "/" << fileprefix << ".log";
 			file = OpenFileWithRetries(filename.str(), "at");
 			if (file == NULL)
-			{
-				throw (string)("Unable to open file for logging");
+			{
+				throw (string)("Unable to open file \"" + filename.str() + "\"for logging");
 				pthread_mutex_unlock(&filemutex);
 				return;
 			}