W5500 board fails on Mega 2560

Question

I’ve spent the last 3 days trying to get a W5500 Ethernet Shield to work on a Mega 2560 and got nowhere. I started a thread on the Arduino forum asking for help and got a good number of replies but am still unable to get the board to work. Rather than copy paste everything from the Arduino forum into this post i ask that you have a read of my thread. Two different W5500 Ethernet Shields fail 100% on three different Mega 2560s but the shields work fine on a Uno. Where can i look for help next? Thanks.

Ricky · Answer

Can you attach the ethernet shield image and code and settings?

Edward · Answer

Hi. You must be used Ethernet2 library of Arduino. It doesn’t work Ethernet library. it is W5100 target library. refer to below link. arduino.cc Ethernet - Arduino Reference The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. Maybe 1.8.0 Arduino IDE version is not installed Ethernet2 library. So, you have to install Ethernet2 library. path is (Enter to Arduino IDE → Sketch → library manage) You should be install to 1.0.3 ethernet2 library. ethernet2_library786×443 15.2 KB Thank you

warwound · Answer

Thanks for the replies. First let me say that i think the problem is related to SPI and not the ethernet library being used. Let me explain… I have installed the Ethernet2 library and tried this example sketch: github.com adafruit/Ethernet2/blob/master/examples/DhcpAddressPrinter/DhcpAddressPrinter.ino /* DHCP-based IP printer This sketch uses the DHCP extensions to the Ethernet library to get an IP address via DHCP and print the address obtained. using an Arduino Wiznet Ethernet shield. Circuit: * Ethernet shield attached to pins 10, 11, 12, 13 created 12 April 2011 modified 9 Apr 2012 by Tom Igoe */ #include #include // Enter a MAC address for your controller below. This file has been truncated. show original The sketch works with my W5500 Ethernet Shield on a Uno but fails on two different Mega 2560s. On the Mega 2560s the sketch always hangs at: Ethernet.begin(mac) I’ve left the sketch running for many minutes many times but the call to Ethernet.begin always fails to return. Now i also have the SdFat library installed and am trying this example sketch: github.com greiman/SdFat/blob/master/examples/SdInfo/SdInfo.ino /* * This program attempts to initialize an SD card and analyze its structure. */ #include "SdFat.h" #include "sdios.h" /* Set DISABLE_CS_PIN to disable a second SPI device. For example, with the Ethernet shield, set DISABLE_CS_PIN to 10 to disable the Ethernet controller. */ const int8_t DISABLE_CS_PIN = -1; /* Change the value of SD_CS_PIN if you are using SPI and your hardware does not use the default value, SS. Common values are: Arduino Ethernet shield: pin 4 Sparkfun SD shield: pin 8 Adafruit SD shields and modules: pin 10 */ // SDCARD_SS_PIN is defined for the built-in SD on some boards. This file has been truncated. show original The sketch works fine on a Uno but again fails on both my Mega 2560s. It logs an error code 0x20, which i can’t find any reference to in order to understand the error. On both example sketches…

warwound · Answer

I’ve made some progress and the ethernet part of the shield is now working. I simply jumpered the shield ICSP pins to the Mega ICSP pins and then jumpered pin 10 from shield to Mega. (I thought i’d done exactly this previously but am not sure). So ethernet works. I then jumpered pin 4 from shield to Mega. Ethernet still works - with and without an sdcard inserted into the shield. However all sketches fail to access the sdcard part of the shield, they still fail as before with the SdFat example showing error code 0x20. The sdcard sketches i have tried all set the Mega SS pin to OUTPUT mode HIGH and ethernet CS pin 10 to OUTPUT mode HIGH. I shall experiment more but if anyone has any suggestions i’d be glad to read them. Did Wiznet ever fix that buggy implementation of SPI in the W5000 chip or is that still a problem with the W5500 chip?