Hi, @anjulatha
Welcome to the forum.
If you google
arduino spi two devices
It will show you tutorial on how to interface more than one device on the SPI bus.
You do not have to use a mutliplexer.
Tom... 
Hi, @anjulatha
Welcome to the forum.
If you google
arduino spi two devices
It will show you tutorial on how to interface more than one device on the SPI bus.
You do not have to use a mutliplexer.
Tom...