private static AppSettings Load()
{
try
{
throw new Exception();
byte[] settingsSize = new byte[4];
BatteryRAM.Read(0, settingsSize, 0, 4);
int size = settingsSize[0] * 256 + settingsSize[1];
if (size == 0 || size > 2044)
{
throw new Exception();
}
int pages = size / 4 + (size % 4 == 0 ? 0 : 1);
byte[] aux = new byte[pages * 4];
BatteryRAM.Read(4, aux, 0, pages * 4);
byte[] settings = new byte[size];
Array.Copy(aux, settings, size);
return((AppSettings)Reflection.Deserialize(settings, typeof(AppSettings)));
}
catch
{
return(new AppSettings());
}
}
public void Save()
{
byte[] settings = Reflection.Serialize(this, typeof(AppSettings));
if (settings.Length > 2044)
{
//EMX has 2048 bytes of battery backed-up RAM. 4 bytes are reserved for size
throw new Exception("Settings size exceed memory limit");
}
byte[] settingsSize = new byte[4] {
(byte)(settings.Length / 256), (byte)(settings.Length % 256), 0, 0
};
int pages = settings.Length / 4 + (settings.Length % 4 == 0 ? 0 : 1);
byte[] settingsPages = new byte[4 * pages];
Array.Copy(settings, settingsPages, settings.Length);
try
{
BatteryRAM.Write(0, settingsSize, 0, 4);
BatteryRAM.Write(4, settingsPages, 0, pages * 4);
}
catch (Exception)
{
//TODO: emulator throws exception
}
}
public static void SetDateTime(DateTime newTime)
{
var buf = new byte[4];
Utility.InsertValueIntoArray(buf, 0, 4, RtcValidMagic);
RealTimeClock.SetTime(newTime); // Update RTC.
BatteryRAM.Write(0, buf, 0, 4); // Mark it valid in BatteryRam.
RtcIsValid = true; // Mark it valid in code.
Utility.SetLocalTime(newTime); // Don't forget to update the framework clock too!
var evt = OnRtcUpdate;
if (evt != null)
{
evt(newTime);
}
}
public const UInt32 RtcValidMagic = 0x6d605ea1; // This is set in BatteryRam when the RTC is valid.
static WallClock()
{
// Establish if the RTC is valid or not based on a magic value set in battery RAM.
var buf = new byte[4];
BatteryRAM.Read(0, buf, 0, buf.Length);
var batteryRamClockVal = Utility.ExtractValueFromArray(buf, 0, 4);
RtcIsValid = batteryRamClockVal == RtcValidMagic;
if (RtcIsValid)
{
Utility.SetLocalTime(RealTimeClock.GetTime());
}
else
{
Utility.SetLocalTime(new DateTime(2011, 01, 01, 0, 0, 0)); // Fake the start of 2011.
}
}
