Trying to configure an external NOR flash causes the application to crash

RE: Trying to configure an external NOR flash causes the application to crash

AMarch01 — Wed, 18 Dec 2024 13:15:19 GMT

Good job, way to stick with it.

RE: Trying to configure an external NOR flash causes the application to crash

Simen Eilevstjonn — Wed, 18 Dec 2024 13:01:13 GMT

I found the issue.

Pin reset is being reenabled by west flash. (ref Use RESET pin as GPIO - nRF52840 )

When I flashed using nRF Connect Programmer, it did work.

The SPI flash example now works

RE: Trying to configure an external NOR flash causes the application to crash

Vidar Berg — Wed, 18 Dec 2024 12:56:29 GMT

[quote user="Simen Eilevstjonn"]The problem is indeed due to the reset pin. When testing now, it still resets the device despite both[/quote]

Note that if your build includes multiple images (e.g., application and mcuboot), the same DT overlay must also be applied to the other images (apply configuration changes to images included via sysbuild).

To confirm that the pinreset function is not enabled on your device, please read out the configuration register at 0x10001200 (PSELRESET[0]). For example, if you are using nrfjprog:

$ nrfjprog --memrd 0x10001200

RE: Trying to configure an external NOR flash causes the application to crash

AMarch01 — Wed, 18 Dec 2024 12:52:52 GMT

I missed that detail > " MISO pin being the same as the reset pin"

I am not sure how that would work in a real-world scenario, especially with this being an input pin. At least you know now.

RE: Trying to configure an external NOR flash causes the application to crash

Simen Eilevstjonn — Wed, 18 Dec 2024 12:48:39 GMT

The problem is indeed due to the reset pin. When testing now, it still resets the device despite both

&uicr {
	/delete-property/ gpio-as-nreset;
};

and

CONFIG_GPIO_AS_PINRESET=n

RE: Trying to configure an external NOR flash causes the application to crash

AMarch01 — Wed, 18 Dec 2024 12:47:18 GMT

Here is a link to someone doing low level access to a flash device. Perhaps it will help?
Interface External flash to nrf52832 - Nordic Q&A - Nordic DevZone - Nordic DevZone

RE: Trying to configure an external NOR flash causes the application to crash

AMarch01 — Wed, 18 Dec 2024 12:42:17 GMT

Ah, sorry, I read ahead on the links (drilled down) and they started to mention file systems.

RE: Trying to configure an external NOR flash causes the application to crash

Simen Eilevstjonn — Wed, 18 Dec 2024 09:02:53 GMT

The device repeatedly, every 250 ms, approximately, tries to read the status register of the flash.

However, the clock should continue for 16 more cycles to get the response, but this is not done. All lines stay low for a while before MOSI and CS go high again.

RE: Trying to configure an external NOR flash causes the application to crash

Simen Eilevstjonn — Wed, 18 Dec 2024 06:42:53 GMT

I started with that example, but since I have a custom board, I must do the configuration myself.

That sample did also not start, so I tried in another application where there was no flash API calls, just the Kconfig lines to enable the flash.

I have not yet tried a file system.

RE: Trying to configure an external NOR flash causes the application to crash

AMarch01 — Tue, 17 Dec 2024 20:51:01 GMT

I suggest as a sanity check, the spi_flash program. I only have experience with it on the nrf52840 DK , but its a low level simple program. If you can get that to work, you should be able to build from there.
That said, I pretty much just save a struct of data to flash, so if you don't need a file system. Perhaps you can get away with just writing blocks of data directly to it?
A M