SPI External Flash Interface

RE: SPI External Flash Interface

arjun — Thu, 03 May 2018 05:42:27 GMT

Hi Vinayak,

As per the issues I faced, I came to the following conclusions -

First thing you have to do is configure the WP/HOLD pins as output. Set the both pins to high. This is to ensure that you have disabled the write protect on memory and you aren't holding the instructions by pausing your device (Hold - low).

Second thing is to always call write enable function (execute write enable command) before executing any fucntion that may cause change in the content of memory

Next thing is, after sending the write instruction(command+address+data) or any similar function, wait until Write in Progress (WIP) bit in the status register is set to zero.

Regards

RE: SPI External Flash Interface

vinayaka — Wed, 14 Mar 2018 06:35:39 GMT

Hi Arjun,

am also facing the same issue, can you please share the modification.

RE: SPI External Flash Interface

arjun — Fri, 20 Oct 2017 05:15:23 GMT

Him Martin,

I have uploaded the code and shared the details in the Mypage.

RE: SPI External Flash Interface

MartinBL — Thu, 19 Oct 2017 13:09:02 GMT

Good question. It's been a long time since I did that myself. I suppose you click here and go with the flow:

RE: SPI External Flash Interface

arjun — Thu, 19 Oct 2017 12:53:36 GMT

How do I create an account in MyPage. There is no "Sign in" option available in the link you have provided.

RE: SPI External Flash Interface

MartinBL — Thu, 19 Oct 2017 10:21:05 GMT

Unfortunately you will need a sepparate account for mypage.

RE: SPI External Flash Interface

arjun — Thu, 19 Oct 2017 05:30:53 GMT

Hi Martin, I could not access the link you sent me using my nordic forum username.

RE: SPI External Flash Interface

MartinBL — Mon, 16 Oct 2017 13:20:22 GMT

You can upload your code in confidence at our official support portal, MyPage, here.

RE: SPI External Flash Interface

arjun — Fri, 13 Oct 2017 13:27:32 GMT

Could you send me some link or mail id so that I cn share my code..

RE: SPI External Flash Interface

arjun — Fri, 13 Oct 2017 13:19:35 GMT

Ya, After initializing the SPI, I am setting the WP and HOLD pins as high. I was able to read the Device ID and write to the status and configuration registers. This I verified by reading the buffer registers, where I stored the values.

I can't use logic analyzer, as in my board, I don't have provision to tap SPI lines.

RE: SPI External Flash Interface

MartinBL — Fri, 13 Oct 2017 13:05:13 GMT

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

RE: SPI External Flash Interface

arjun — Fri, 13 Oct 2017 08:40:20 GMT

I am using S70FL01GS flash ic..

RE: SPI External Flash Interface

MartinBL — Fri, 13 Oct 2017 07:43:14 GMT

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

RE: SPI External Flash Interface

arjun — Thu, 12 Oct 2017 10:23:15 GMT

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.

RE: SPI External Flash Interface

MartinBL — Thu, 12 Oct 2017 09:23:58 GMT

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?