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Save settings to Mountaineer ETH flash



what is the best way to save settings to the the flash memory?

I’ve tried the ExtendedWeakReference class, but my settings won’t survive power down, although I’ve set:


I have a project with one Mountaineer ETH mainboard, one BrightSign HD220 Video-Player and a Windows Service installed on a Windows Server 2012.

The Mountaineer sends a http request to the Windows Service, the Service responds with a json-file, which contains the IP of the Brightsign-Player.

I want to save the IP of the Brightsign Player in flash. In case of the Windows Server isn’t available, the Mountaineer can load the IP-Address from flash so that the communication between the Mountaineer and the Brightsign-Player works.

I hope you understand what I want to do.

Thank you in advance.


Thank you for this answere. Both flags are already set.
A sleep of 3000 ms after the

EWR.Target = Settings;

is performed aswell.


I save the settings in a seperate thread.

        private Settings m_Settings;

        /// <summary>
        /// This static field refers to the extended weak reference object, in 
        // order to prevent it from being garbage-collected.
        /// </summary>
        private static ExtendedWeakReference StaticSettingsExtendedWeakReference;

        /// <summary>
        /// This private class is used as a signature to uniquely identify data 
        /// we own.  It is not necessary to create a dedicated class for this 
        /// purpose.
        /// </summary>
        private static class TypeUniqueToOurApp { }

        /// <summary>
        /// This is the class that will be stored in Flash memory.  This class 
        /// must be serializable.
        /// </summary>
        private sealed class Settings
            /// <summary>
            /// This method sets the number of boots.
            /// </summary>
            /// <param name="ipAddress">The number of times the device has been 
            /// booted.</param>
            public Settings(byte[] ipAddress)
                IpAddress = ipAddress;

            // Fields must be serializable.
            public byte[] IpAddress;

private bool InitFlashMemory()
                StaticSettingsExtendedWeakReference= ExtendedWeakReference.RecoverOrCreate(typeof(TypeUniqueToOurApp), 0, ExtendedWeakReference.c_SurvivePowerdown);
                StaticSettingsExtendedWeakReference.Priority = (Int32)ExtendedWeakReference.PriorityLevel.System;
                return true;
                return false;

private void StartSaveSettingThread()
            m_SaveConfigToFlashThread = new Thread(SaveSetting);

private void SaveSetting()
            if (m_PlayerIP.Length > 0)
                m_Settings = new Settings(m_PlayerIP);
                while (StaticSettingsExtendedWeakReference.Target == null)
                    StaticSettingsExtendedWeakReference.Target = m_Settings;
                WriteLogAndDisplay("Settings saved!", true);

Edit: The “StaticSettingsExtendedWeakReference” was setted wrong. The one above is correct now.


That unit has •8 MB external Flash, for data logging.

please see this thread for how to access it
Works way better than EWR.