imx rt 1020 Nor Flash and freertos?

[bp1979]

Hi,

I have an imx rt 1020 evk board which has external flash. The external flash does not support RWW. So I have learned to put my code in RAM to prevent reading from flash (executing program code) while writing to flash (erasing/programming).

This went fine, until I started to integrate my prototype in my actual application, which runs in a freertos environment. 

Now I can make a simple test which consists of the following steps:

- initialize flash,

- erase a sector

- program some bytes

When I execute this test sequence before the freertos scheduler starts, all is good.

But, when I run this test sequence in a task, I get guaranteed hardfaults. I guess the reason is that while erasing/programming task switches happen, thus code gets executed which is stored in flash and boom, I'm screwed.

What is the best way to cope with this? I have 64K of ITC memory, but my application is 120K in debug (and still 80K in release build). So I am not really able to store my entire app in flash.

Can you please advise how to deal with this?

many thanks.

[jeremyzhou · Accepted solution]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
I'd like to suggest you implement critical section protection for a variety of flash operations.
Have a great day,
TIC

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[bp1979]

I thought it would be a bit drastic to disable interrupts during erasing, but it works perfectly. Thanks, simple and works like a charm