MSP-EXP432P401R: Where can I find software examples?

Bálint Garas

Intellectual 675 points

Part Number: MSP-EXP432P401R
Other Parts Discussed in Thread: MSP430FR5989

Hello everyone!

I am looking for a software example(or some general explaining) that helps with the flash memory.

Previously I was using MCUs with FRAM only(msp430fr5989).

I would like to achieve persistent variables but so far I wasnt successful.

I understand that the logic is read-modify-write.

My questions:

How can I create a persistent variable(fore. uchar)?

Do I have to follow the read-modify-write algorythm? or can I do modify-write only?(thinking about something like var++, where var is persistent),

How do I use the variables that I store in flash?

When I am using them are they moved to the ram?

As I understand, I should not write my variables new value everytime they change, right?

I think this beacuse of the limited amount of read/write on flash memory. Correct me if I am wrong.

I looked at the flash_program_memory software example on dev.ti.com, but i couldnt figure it out.

Also I checked slaa704 and slau356i but i couldnt exactly figure it out.

Bálint

over 5 years ago

0 Lukas Badura over 5 years ago

TI__Expert 4695 points

Hi,

You can find code examples in the SDK for the MSP432P401R

Best regards

Lukas

0 Bálint Garas over 5 years ago in reply to Lukas Badura

Intellectual 675 points

Dear Lukas,

I have the sdk installed. I checked all 3 example codes, but none of them is about reading back the flash. 2 is about erasing, and 1 is about writing.

Bálint

0 Bálint Garas over 5 years ago in reply to Bálint Garas

Intellectual 675 points

Hello!

After testing and reading some msp430 documentation I learned that I should use pointers for this task.

Now I have no trouble reading the memory.

I have another question though:

In my application I would like to store some data in the flash. I use MAP_FlashCtl_programMemory to write to the flash, and I can see that after erasing a sector I can write whatever I want in it. But is it possible to change only one byte using this above mentioned function without erasing the whole sector? If not I need to read the sector to RAM, change the one byte , erase the sector and write the whole sector back. If yes how is it done, can you direct me to an example?

Bálint

0 Alexis Crandall20 over 5 years ago in reply to Bálint Garas

TI__Genius 15590 points

HI Bálint,

No, you will have to erase the flash before programming it.

Thanks,

Alexis

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

MSP-EXP432P401R: Where can I find software examples?