S32KのトピックRe: S32K311 has any software reset APIs keep ram value?

S32K311 has any software reset APIs keep ram value?

EvaKi — Fri, 23 Aug 2024 09:23:57 GMT

I want to use software reset function to reset MCU(not watchDOG timeout),

After the reset, I want to keep the values in the RAM array.

I use

Power_Ip_MC_ME_SocTriggerResetEvent(POWER_IP_FUNC_RESET_MODE); or

Power_Ip_MC_ME_SocTriggerResetEvent(POWER_IP_DEST_RESET_MODE);

RAM array loss value

Re: S32K311 has any software reset APIs keep ram value?

Julián_AragónM — Fri, 23 Aug 2024 17:48:56 GMT

Hi @EvaKi,

Functional resets will keep SRAM data unchanged by the hardware mechanism. Destructive resets cannot guarantee the SRAM data integrity.

In the default startup code for S32DS SRAM ECC initialization will be performed regardless of the reset source, so the SRAM data is overwritten after each reset. This is why you see the RAM array lose its values.

Best regards,
Julián

Re: S32K311 has any software reset APIs keep ram value?

EvaKi — Mon, 26 Aug 2024 02:02:54 GMT

Hi @Julián_AragónM

Does NXP have any demo codes for solving this startup code for S32K3 SRAM ECC initialization?

RAM retention across functional reset

Re: S32K311 has any software reset APIs keep ram value?

Julián_AragónM — Mon, 26 Aug 2024 16:37:30 GMT

Hi @EvaKi,

I'm not aware of any example, but please take a look at the following community post: SRAM ECC Initialization for S32K344 - NXP Community.

Best regards,
Julián