WIZnet Developer Forum

Multiple SPI-Devices

Hi,

I am using a WIZ820io with an Arduino Nano. If the WIZ820io is the only device on the SPI Bus it is working correctly. But when I add a second device (a MFRC522 RFID-Reader) to the SPI Bus - the module is not working any more. (MFRC522 => Works, WIZ820io => Not working)

I found an application note for w5100 which says that the SEN-Pin must be changed. But the w5200 didn’t have such a SEN-pin.

What could be the problem???

Hi,
SEN means SPIEN pin #6 in W5200.

Hi,

but i can’t set this pin. It doesn’t have a pin outside of wiz820io :frowning:.

Hi,
WIZ810io have no SPIEN pin. you are right.
WIZ810io doesn’t support mulit-slave.

I recommend that you will replace WIZ820io with W5200 ehternet sheild.
refer to
http://www.wiznet.co.kr/sub_modules/en/product/Product_Detail.asp?cate1=5&cate2=81&cate3=82&pid=1208

Thanks.

Hi,
The above my post is wrong. I am sorry that I mis-understood W5200 with W5100.
W5200 have no problem using multi slave.
So, WIZ820io have no SEN pin.

If you can’t use it with others, It maybe have another problem.

thanks.

Copyright © 2017 WIZnet Co., Ltd. All Rights Reserved.