topic Re: MPC5744P in S32 Design Studio

MPC5744P

1121146885 — Mon, 29 Oct 2018 02:12:31 GMT

请教一些各位大神，MPC5744P中，如何使得在软件复位后指定RAM分区里的数据不丢失？

in MPC5744P,

How to make the data in the specified RAM partition not lost after the software reset?

Re: MPC5744P

jiri_kral — Mon, 29 Oct 2018 09:23:35 GMT

Hi,

Normally after reset are uninitialized variables set to 0 by startup code. You can put your variables into .noinit section. In this case variables will be skipped out from setting to 0:

__attribute__ ((section(".noinit"))) uint16_t my_global_array[100];

Jiri

Re: MPC5744P

1121146885 — Mon, 29 Oct 2018 13:49:29 GMT

Oh!Thank you so much,my friend!

Re: MPC5744P

1121146885 — Tue, 30 Oct 2018 00:59:32 GMT

hello sir,

more question to me, my aim is to define a bootloader_start_var __, I jut use __attribute__ ((section(".noinit"))) to define my var didn't work, I found there is't .noinit section in the 57xx_flash.ld.

Do i need to define the .noinit section in the .ld files? should I do something in the file startup.s?

I am a totally newbies, thanks for your time!