The time to erase the flash is too long

[alex kim]

Hi,

I am using 

• nRF52840
• SDK 15.3.0
• Keil IDE
• The soft device is S140 
• JLinkRTTViewer for debug

Device has both Central & peripheral functions.
It takes about 15 seconds to erase flash 63 pages.
It takes too long to erase the flash 63 page in 15 seconds.
Below is the erase command I used.

uint32_t pages_to_erase = (size + 0xFFF) / 0x1000; // (1Sector = 0x1000 (4096) Bytes)

rc = nrf_fstorage_erase (
     & fstorage, / * The instance to use. * /
     addr, / * The address of the flash pages to erase. * /
     pages_to_erase, / * The number of pages to erase. * /
     NULL); / * Optional parameter, backend-dependent. * /

Please advise.

[Vidar Berg]

Hi,

It takes up to 85 ms to erase a flash page according to the product specification, but that's not including the overhead you have when you have to schedule flash operations through the Softdevice. It would be faster if you could erase the flash using the NVMC directly before enabling the Softdevice.

More on how flash operations are scheduled when Softdevice is enabled: Flash memory API