Zephyr nRF52 flash driver

[jlz]

I plan to use the flash device driver from Nordic (52840) in a Zephyr system. My plan is to use the <flash.h> api but it seams that this api is not available in a default configuration.

I have experimented with this parameters from the project::

CONFIG_FLASH_NRF=y
CONFIG_FLASH_HAS_DRIVER_ENABLED=y

And it's obviously not working because ->

flash_dev = device_get_binding(FLASH_DEV_NAME);

returns NULL.

[jlz]

I now have the flash_dev working. I now use this configuration flags.

CONFIG_FLASH=y
CONFIG_SOC_FLASH_NRF=y
CONFIG_FLASH_HAS_DRIVER_ENABLED=y

But the configuration is not fully configured. Still get exception error when the driver executes write_op().

[Vidar Berg]

Hi,

Can you instead send this question to the Zephyr mailing list?  

https://lists.zephyrproject.org/g/users.  

I can look into this if not, but it will probably take longer time.    

[jlz]

Sure, But this is not really a Zephyr component because it's part of the Nordic device driver implementation. I do agree that CONFIG_ flags is part of Zephyr but the NOR driver is Nordic. I have not used Nordics NOR driver before so I'm not sure witch part needs to be configured from a default state. I can see a that the flash geometry is there but still exception error in write_op().

[jlz]

I fixed the exception error by removing the UNALIGNED_GET() from write_op. Strange why this issue occur, any comments? I also mange to write to the device but only ones. I use flash_write_protection_set(flash_dev, false) but I cannot write to the device anymore. Read and Erase works and I do not get any errors back from the flash_write api.

[Vidar Berg]

Hi, 

Thanks for the update. I've started to look into this, but takes time to get familiar with the code base. Please include flash related code snippets in your answer for reference. 

"I also mange to write to the device but only ones". 

As you may know, the flash is all ones by default (i.e., after an erase). So are you certain that the flash was actually written to? Also worth noting is that flash writes must be word aligned. Writing to an unaligned address in flash will lead to a  fault exception.