how to erase partial of a page in flash memory

[lyrics]

Hello.

I'm using nRF52833, pca10100.

Can I erase only 16 bytes (or more..)?

I read this explaination, and there's an erase page partial register, but I don't know how to use it. Do you have any code or examples to refer to?

Regards,

lyrics

[Håkon Alseth]

Hi,

 

Can I erase only 16 bytes (or more..)?

No, an erase will be aligned on a flash page, which is 4k in the nRF52-series devices.

I read this explaination, and there's an erase page partial register, but I don't know how to use it. Do you have any code or examples to refer to?

This is related to chunking up an erase operation into several time slices. A full erase of a page takes 87.5ms for the nRF52833, as shown here: https://infocenter.nordicsemi.com/topic/ps_nrf52833/nvmc.html?cp=4_1_0_3_2_10#unique_1917145559

The problem is that any flash access during this time will halt the CPU until the flash operation is finished. The "partial erase" allows you to do 9 x 10 ms chunks for erasing one page to avoid such a long CPU halt time at once.

 

Kind regards,

Håkon