Multiple SPI-Devices


#1

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???


#2

Hi,
SEN means SPIEN pin #6 in W5200.


#3

Hi,

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


#4

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.


#5

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.