WIZ820io provides easy and simple Ethernet connectivity to small platforms like GR-KURUMI (Compatible with Arduino Pro Mini).
WIZnet W5200 ethernet chip is used in WIZ820io.
To use WIZ820io with GR-KURUMI, users need to replace 4 files in the Ethernet library for GR-KURUMI.




WIZ820io_GR_KURUMIPWDN, nINT signals are not used.



Install W5200 library

Download modified w5100.cpp & w5100.h and files (attached) and overwrite onto the”RLduino78/libraries/Ethernet/utility” folder in your project in e2studio.

  • Uncomment a below line in the modified w5100.h
//#define W5100_ETHERNET_SHIELD
  • Change MAX_SOCK_NUM as 8 on Ethernet.h in RLduino78/libraries.
//#define MAX_SOCK_NUM 4 //for W5100 Ethernet Shield
#define MAX_SOCK_NUM 8 //for W5200 Ethernet Shield / WIZ820io
view raw Ethenret_ConfigMSN.h hosted with ❤ by GitHub

SPI Configuration

    • Set SPI Mode as Mode0 and change the SPI.h in ” RLduino78/libraries/SPI” as below,
//#define SPI_MODE_MASK 0x3000 // DAP = bit 13, CKP = bit 12 on SCR
#define SPI_MODE_MASK 0x0000 // DAP = bit 13, CKP = bit 12 on SCR for WIZ820ioIZ820iohield
view raw spi_ConfigSPIMode.h hosted with ❤ by GitHub
    • Set SPI Clock Divider (@16MHz)and change the in SPI.c in “RLduino78/libraries/SPI ” as below,
#include "pins_arduino.h"
#include "SPI.h"
void SPIClass::begin() {
SPI_SIRxx = 0x0007; // Clear Error Flag , エラ-フラグをクリ
SPI_SMRxx = 0x0020; // Config. SPI Mode , モ-ド設定
SPI_SCRx = 0xF007; // Config. Serial , シリアル通信動作設定
//SPI_SDRxx = SPI_CLOCK_DIV4 << 9; // Config. SPI Clock Diviver (@8MHz), 動作クロックの分周設定
SPI_SDRxx = SPI_CLOCK_DIV2 << 9; // Config. SPI Clock Diviver (@16MHz)動作クロックの分周設定
view raw spi_SetSPIClock.cpp hosted with ❤ by GitHub

Using the W5200 library and evaluate existing Ethernet example.

All other steps are the same as the steps from the Arduino Ethernet Shield. You can find examples in the Arduino IDE, go to Files->Examples->Ethernet, open any example, then copy it to your sketch file (gr_sketch.cpp) and change configuration values properly.
After that, you can check if it is work well. For example, if you choose ‘WebServer’, you should change IP Address first and compile and download it. Then you can access web server page through your web browser of your PC or something.

Revision History

Initial Release : 28 July 2013