Ethernet Shield Reset

Projects General Guidance
1

Quick Question, Hopefully a quick answer.

I have an ethernet shield connected to an arduino uno. A condition has come up in testing that requires a restart to the Ethernet Shield but NOT to the arduino itself. I bent the reset pin on the ethernet shield so that it did not connect to the arduino, connected pin 6 to the ethernet shield's reset, and issued the following command

void ResetEthernet()
{
  Serial.println("4th");
  pinMode(6, OUTPUT);
  digitalWrite(6, LOW);
  delay(500);
  Serial.println("5th");
  digitalWrite(6, HIGH);
  Serial.println("6th");
  delay(500);
  pinMode(6, INPUT);
  Serial.println("7th");
     // start Ethernet
  Ethernet.begin(Config.mac, Config.ip, Config.gateway, Config.subnet);
}

When i use the serial monitor, i only get the 4th println and then my setup() code is called signifying the arduino has been reset. Any suggestions?

2

According to fungus, just the Ethernet.begin() call should reset the ethernet shield.
http://arduino.cc/forum/index.php/topic,75006.0.html

3

Yes, it does a soft reset on the ethernet shield. However, what i am proposing to do is basically press the reset button on the ethernet shield through code. Using some more serial.println i was able to determine that the pinMode() command seems to be whats restarting the arduino. Not sure why though?

4

Seems there may be a diode mod that could fix the problem if the shield needs to start after the arduino.

5

Maybe you need to bend one more pin. There is a reset pin on the ICSP connector (pin 5). Maybe that is how the reset is getting to the Uno.

6

Older reset info.

7

I believe you are right surfertim! much thanks!
If i am looking at the bottom of the shield with Italy facing normally..which one is pin5..i find the schematics to be a little vague

8

Pin 5 is easier to find on the component side of the Uno. It is the pin under the IC in ICSP.
You should be able to see a very small white dot at pin 1.

There is also a small white dot at pin 1 on the shield.