LPC54018 persistent variable storage in single SPI Flash across power cycles

[mitchkapa]

Hi,

I'm using an LPC54S018 microcontroller with a single 16 MB SPIFI flash.  The application code is too large to fit into RAM and so I am using the XIP_IMAGE flag during compile.  I need to store variables in the flash for access across power cycles.  I have been following the steps listed in this forum post:

https://community.nxp.com/t5/Kinetis-Microcontrollers/STORING-VARIABLES-IN-FLASH/m-p/650092

but I can't modify the "test" variable once the code is running, because it is read-only.  Is there a way to make the test variable read/write, and able to be saved across power cycles?

Thanks for your help,

Mitch

[ZhangJennie]

Hi

We need to use spifi flash command to erase and write spifi flash.

I suggest you check SDK spifi polling demo code:

Have a nice day,

Jun Zhang