SNVS general purpose registers

[DanielePagani]

    Dear sirs,

we're wondering if it's correct to use the SNVS module for temporary storage of some variables, in order to keep their value even after a Reset Software. 

As example:

#include "fsl_snvs_lp.h"

int main(void){

...

uint32_t registers[4];

SNVS_LP_Init(SNVS);

registers[0]=SNVS->LPGPR_ALIAS[0];

registers[1]=SNVS->LPGPR_ALIAS[1];

registers[2]=SNVS->LPGPR_ALIAS[2];

registers[3]=SNVS->LPGPR_ALIAS[3];

PRINTF("Registers:%u,%u,%u,%u\n",registers[0],registers[1],registers[2],registers[3]);

registers[0]++;

registers[1]+=2;

registers[2]+=3;

registers[3]+=4;

SNVS->LPGPR_ALIAS[0]=registers[0];

SNVS->LPGPR_ALIAS[1]=registers[1];

SNVS->LPGPR_ALIAS[2]=registers[2];

SNVS->LPGPR_ALIAS[3]=registers[3];

SNVS_LP_Deinit(SNVS);

NVIC_SystemReset();

...

}

The example seems to work fine, but at Chapter 19.2 - SNVS introduction of IMXRT1060 Reference Manual (we're using MIMXRT1060-EVK board) we read:

"SNVS incorporates both security and non-security functionality. The SNVS non-security functionality is described in this document, but the SNVS security functionality is described only in the Security Reference Manual."

We don't know if some security-related features can affect general purpose registers.

BR

Daniele

[victorjimenez · Accepted solution]

Hello Daniele,

If I understood correctly, you want to use the SNVS_LP General Purpose Registers, right? If this is the case, then the security features won't affect these registers at all.

Have a great day,
TIC

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