nRF2401 PIN Function.

[Francis Feng]

• Please tell me what interfaces these three are? Is SPI compatible here?

• 

[Kazi Afroza Sultana]

Hello,

As I said in my previous reply, this is very old IC. Later we have nRF24L01+, you can see the block diagram of nRF24L01+ where SPI is present, so you will have the functionaities of CSN; SCK, MISO, MOSI pin directly. 

This is from nRF2401

It's not the functionalities of SPI directly but its similar. You have to bit-bang with GPIOs and its not an easy process. Why your customer is not trangferring to the current version of this chip? Then it will be easier to get support.