topic Re: S32K144 - switch to big-endian? in S32 Design Studio

S32K144 - switch to big-endian?

Novalis — Wed, 12 Aug 2020 11:11:58 GMT

Hello,
is it possible to switch to big-endian in S32DS for S32K144? I am porting some project from Coldfire V1 and there are so many structures used in communication, which assume big-endiannes ...

I tried -mbig-endian in compiler options, but I got "compiled for a big endian system and target is little endian" error :smileysad:

Is it even possible to switch to big-endian?

Thanks,

Martin

Re: S32K144 - switch to big-endian?

jiri_kral — Wed, 12 Aug 2020 11:32:58 GMT

Hi,

as far as I know, there is no such gcc parameter or __attribute__. Normally is such situation handled by some "endian_swap" function in receive/transmit.

Jiri

Re: S32K144 - switch to big-endian?

Novalis — Wed, 12 Aug 2020 11:58:49 GMT

I just did "send(uin8t_ *ptr_to_struct, uint16_t len)" before, now I would need to make copy of the struct, do the swapping and then send it, that would be so much rewriting for all the structures, so I thought that it would may be possible to switch S32K144 (to big-endian mode somehow (may be SETEND instruction, but it seems that it doesn't exist in Cortex-M series anymore - see ARM Cortex-M - Wikipedia ).

Re: S32K144 - switch to big-endian?

alexanderfedoto — Mon, 17 Aug 2020 20:48:49 GMT

Seems like "compiled for a big endian system and target is little endian" error is the linker error since libraries are Little Endian. NXP GCC contains only LE prebuilt libraries.