LPC55S69 : unmapped MPU

EugeneHiihtaja — Wed, 20 May 2020 11:02:01 GMT

Hi !

Looks like MPU of LPC has only 8 sections and as result a lot of memory is covered by default privileged access only:

/* Enable MPU with privileged background access i.e. unmapped regions have privileged access. */
portMPU_CTRL_REG |= (portMPU_PRIV_BACKGROUND_ENABLE | portMPU_ENABLE);

But what are other memory attributes in those areas ?

Read, Write and execute Execute ?

Can unmapped area be used as normal RW memory and for access peripheral devices ?

Or what are limitations and default attributes for LPC55S69 memory map ?

Regards,

Eugene

Re: LPC55S69 : unmapped MPU

Alice_Yang — Fri, 22 May 2020 07:50:24 GMT

Hello Eugene Hiihtaj,

You can use the register MPU_CTRL->PRIVDEFENA control software access to default memory:

About detail please refer to Cortex-m33 User Guide, I attached it for you.

Have a great day,
TIC

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LPC55S69 : unmapped MPU

Re: LPC55S69 : unmapped MPU