Interfacing of nRF52840 with SPI based NOR flash

[pradeepyadav]

Hi, I was trying to interface nRF 52840 with a SPI based NOR flash (IS25LP064A). I am using SPI example in 16.0.0 sdk version. But i am not able to read the device id as this should be first step to start using the SPI nor flash to make sure every thing is good to go. I have tried MODE 0 and MODE 3 both of them does nothing for me, not able to resolve what is wrong with setup.

Any leads will be help full, Thank you.

[awneil]

So what debugging have you done to find what's going on?

• What hardware are you using ?
• How have you verified your hardware ?
• Have you stepped through the code, to see what's happening inside the nRF52840 ?
• Have you used an oscilloscope or analyser to see what's happening on the wires ?

[pradeepyadav]

Hi thanks for quick reply.

I am using nRF52840 and NOR flash (IS25LP064A).

I have verified both of them, I have check the flash with arduino, could able to read the device id.

I have tried to use two nrf52840 one as master and other as slave, that also worked fine.

[pradeepyadav]

I would like to know, in which mode i have to manage CS pin. The SPI device that i am using supports mode 0 and mode 3.

[awneil]

pradeepyadav said:

I have verified both of them

So you've verified each one separately - but how have you verified the combination of nRF52840 + IS25LP064A ?

Show your schematic.

And, again:

• What hardware are you using ?
• Have you stepped through the code, to see what's happening inside the nRF52840 ?
• Have you used an oscilloscope or analyser to see what's happening on the wires ?

[awneil]

pradeepyadav said:

I would like to know, in which mode i have to manage CS pin

As always, You have to do whatever the slave's datasheet tells you! 

But you say you have it working with Arduino,  so you must have already answered that question to get that working:  the slave neither knows nor cares what master you use - so it won't change!