interfacing sd card with petit fatfs file system by chang

[VKUMA.12]

Petit fatfs file sysytem consumes ram 290 bytes instead of 44 bytes mention on the document.

http://elm-chan.org/fsw/ff/00index_p.html

Also pff.c file consumes all ram

[chaaalyy]

Features

• Very small RAM consumption (44 bytes work area + certain stack).

...

You forgot the "certain stack" 😉 compare it to the "standard" edition of fatFS and you´ll see, it IS small ...

[VKUMA.12]

thanks for reply , but total how much ram required to run petit fatfs.

[Piranha]

If you don't know what a stack memory is, then start with learning that!

[VKUMA.12]

Thanks for reply but my question is still same, how much stack memory it will take and i think its not small memory, it takes over 300 bytes.

[waclawek.jan]

> Petit fatfs file sysytem consumes ram 290 bytes

How do you know?

JW

[VKUMA.12]

because value of data in keil shows 300 after compiling with memory error.

[waclawek.jan]

Observe in mapfile how exacrltly the data are allocated. There may be RAM area lost because of padding/alignment, or inappropriate choice of data width.

Optimization of any kind - here for minimal memory space - requires effort and understanding of the used tools (compiler, linker etc.).

JW