SPI External Flash Interface

[arjun]

Hi,

I am trying to interface external flash with the nrf52. I am able to read the device id. After writing to the status - configuration - bank address registers, I am able to read the register values.

But when I am trying to write to the flash and read from it, I am getting FF only. For reference, I went through the following documentation - infocenter.nordicsemi.com/index.jsp

For reading and writing, I have used the commands given in the above documentation (Write - 0x02 / Read - 0x0B).

Kindly give me some suggestions on, how to debug.

[MartinBL]

In your tag you specify nRF52832, which doesn't have quad SPI. So I'm a little confused, why are you referring to the QSPI documentaion for the nRF52840, and does the read/write commands referenced above have anything to do with reading and writing to your particular FLASH device?

[arjun]

I was referring to the the timing diagram and command set, which explain the working of spi interface with respect to memory.

The read/write commands referenced are given in the datasheet of the memory ic.

[MartinBL]

Ok, I see. What flash IC are you using?

[arjun]

I am using S70FL01GS flash ic..

[MartinBL]

1. I assume you are handling WP pin correctly? Seems like it must be pulled high when writing or left unconnected.
2. Do you have a logic analyzer you can use to see what data are actually transferred on the bus?
3. Do you mind uploading your relevant code?