little fs for stm32h743ii

[KNaim.1]

Dear all,

I have dev a custom board  pcb based on stm32h743ii with 32MB of flash and 32MB  sdram FMC  for a 7 inch lcd HD. I am new on cubeide i coming from esp32 world and i have some programing dev question .

Is it a good idear to implement :

To partition the flash in 2 regions 1 for system the 2  to store image in the flash in png or jpeg format then load them....

What is the best solution for this family of mcu.

[AScha.3]

Hi,

the H743xI has 2MB flash , this should be enough for most programs. :)

(Just my program on H743 here , has about 10000 lines C , needs about 170 KB flash, with -O2 optimizer set. )

>What is the best solution for this family of mcu.

As always: what fits your needs, the cpu dont matter. Most used here is probably fatfs .

Can be selected in Cube:

...also for external flash...

So for your pictures : are pics fix - or changing many times ?

-> just because you write them once to the external flash or want to modify them often?

If fix, i would write them simply as data arrays, no file system needed.

If edit pics, change them often, i would prefer something like a sd-card, with fatfs (so edit on PC is easy).

[KNaim.1]

Thanks for this first answer i don't have sram on the pcb  and not usb otg when i have builded the board  it was my first 4 layers pcb  and i was really happy that my custom board was working after the first soldering with the following spec:

QSPI flash    25Q256JVEN / 32MB

sdram : w9825g6kh 256/ 32 MB

LTDC: 24 bit rgb888

I2C : touch ft 5426

Is it possible to create a file system fatfs on a partition of the QSPI flash ? 

[AScha.3]

Yes, should work.

I searched forum : > QSPI flash fatfs <

->

https://community.st.com/t5/stm32-mcus-products/what-is-the-best-way-to-get-started-with-qspi-flash-and-stm32f7/m-p/394248#M109899

or

you could use the sdram , for display only small part used, i suppose.