How to replicate the spiflash sample code for external flash other than MX25R64

[Srikara]

we are using nRF52840 

External flash is 128Mb flash.

we have tested the C:\ncs\v2.1.0\zephyr\samples\drivers\spi_flash\ on DK and it works fine.

In MAIN.C file for the following line 

flash_dev = DEVICE_DT_GET(DT_ALIAS(spi_flash0)); 

it fills flash_dev  with "mx25r6435f@0"(defined in DTS).

Our query here is how spi_flash0 is understood as  mx25r6435f@0.

Our external flash is MT25QL128ABA and it is of 128Mb.

we are using Qspi: parameter to define it.

For this same falsh when we use the same code as function in our application 

flash_dev = DEVICE_DT_GET(DT_ALIAS(spi_flash0));  is not getting success.

Can you suggest what and all the parameters we need to modify to proceed further to bring up our flash.

It is SPI flash only.

[Srikara]

Can I get help on this 

[Sigurd Hellesvik]

Hi,

You can add a new external flash using the devicetree.

You can search the nRF Connect SDK for examples on this. For example https://github.com/nrfconnect/sdk-zephyr/blob/main/tests/drivers/flash/boards/nrf52840dk_mx25l51245g.overlay.

To get JEDEC information about your external flash, see its datasheet. Try the JESD216 Sample to read out JEDEC info also.

Regards,
Sigurd Hellesvik

[Srikara]

With the changes suggested , the SPI_flash ported to our custom application works with out any error.

 [email protected] SPI flash testing
00> 
00> ==========================
00> 
00> 
00> Test 1: Flash erase
00> 
00> Flash erase succeeded!
00> 
00> 
00> Test 2: Flash write
00> 
00> Attempting to write 4 bytes
00> 
00> Data read matches data written. Good!!

Thank you. If any other input needed will connect back

[Srikara]

one thing i missed is as this is success, how i can write one file to flash and read the content of the file

[Sigurd Hellesvik]

To write and read from flash, I suggest using a Storage driver or a File System.
For samples, see NVS sample or FS Samples.

Regards,
Sigurd Hellesvik