Reset ethernet port

I received my Netduino Plus 2 about 1 week ago, and I have really enjoyed experimenting with it so far. What a great little board !!

But, I had found an issue that kinda drove me crazy....

Working on an ethernet type of app, I ended up finding out that the ethernet did not seem to initialize (show ACT LED) when power had been removed for 15 or more seconds (i.e. first Power Up). I found that simply pressing the onboard button to reset, or even just unplug it again quickly then reconnect would resolve the issue.

For reliability though, this bothered me. For instance: what if a device lost power, it would not reset itself until YOU push the button. Not good.

I found all sorts of issues posted here but couldn't find anything that sounded like my issue.

I also had tried using the power management command to cycle power to the ethernet chip, no go...

Doing a hardware reboot via software ( PowerState.RebootDevice(false); ) alone, did not solve the issue either.

FINALLY today, I found that if I send a reset to the ethernet IC, THEN reboot, VOILA !! it finally works

The reset "/ENC_RESET" comes out on pin 54 from the Micro, and relates to (Cpu.Pin)50. It is normally HIGH.

private static OutputPort resetEthernetPort = new OutputPort((Cpu.Pin)50, true); //0x32 hex

I cycle it low, sleep 50ms, then back high and RebootDevice:

resetEthernetPort.Write(false); Thread.Sleep(50); resetEthernetPort.Write(true);

PowerState.RebootDevice(false);

Just wanted to share, if this helps anyone else out.

Here is the section of code:

private static OutputPort resetEthernetPort = new OutputPort((Cpu.Pin)50, true); //0x32 hexpublic static bool DHCP = false;// if DHCP set to true, these two values dont matter.   Subnet mask is set to: 255.255.255.0public static string myIPaddress = "192.168.137.10";public static string myGatewayAddress = "192.168.137.1";private static void resetEthernet()        {            resetEthernetPort.Write(false);            Thread.Sleep(50);            resetEthernetPort.Write(true);        }private static void rebootME()        {            resetEthernet();            PowerState.RebootDevice(false);        }private static void checkIP()        {            NetworkInterface NI;            if (DHCP)            {                Debug.Print("Setting to DHCP.");                NetworkInterface.GetAllNetworkInterfaces()[0].EnableDhcp();            }            else            {                Debug.Print("Setting to static IP address.");                NetworkInterface.GetAllNetworkInterfaces()[0].EnableStaticIP(myIPaddress, "255.255.255.0", myGatewayAddress);            }            int countTry = 1;            while (true)            {                NI = NetworkInterface.GetAllNetworkInterfaces()[0];                if (NI.IPAddress != "0.0.0.0")                {                    Debug.Print("IP Address Obtained: " + NI.IPAddress);                    break;                }                else                {                    Debug.Print("Try #" + countTry + ". No IP Address ...");                    Thread.Sleep(2000);                }                countTry++;                if (countTry == 6)                {                    Debug.Print("Failure after 5 tries.  Rebooting device...");                    rebootME();                }            }        }

I was hoping that just doing a quick reset at the beginning of the program would also work, but for some reason it doesn't. It seems to need the Reboot Device, also.

Oh... and I DO have the current firmware, v4.2.1.2