nrf_flash_write , how to assign dynamic addressing of location.

[Rommel]

Hi, 

Am trying to store the data fetched through ble scanning to the flash memory of the nrf52840 DK. So I have been making use fo the flash_storage example in the SDK/examples/peripherals. 

 rc = nrf_fstorage_write(&fstorage,0x3f000 +  10, m_hello_world, sizeof(hello_world), NULL);
APP_ERROR_CHECK(rc);

This throws error .

If I change the above code to 

 rc = nrf_fstorage_write(&fstorage,0x3f000, m_hello_world, sizeof(hello_world), NULL);
APP_ERROR_CHECK(rc);

This code , doesn't throw error. I want to auto update the location for storing the data into flash memory, can anyone help me out in this issue. 

Thanks, 

[tesc]

Hi,

When you get an error you should always run a debug build and/or do a debug session in order to figure out exactly where it fails and with what error value. Without that it can be difficult or impossible to tell what went wrong. However, in this case I suspect you get the error code NRF_ERROR_INVALID_ADDR (0x10, or 16 in decimal) from the nrf_fstorage_write() function call, because of the value of the dest parameter.

Flash is organized in groups that are four bytes ins size. This is called a "word". In order to write to flash, the address that you write to must be the address of such a word. (Another way to describe this: The address (which is in bytes) must be divisible by four.) The address 0x3F000 is word aligned, and should work. The address 0x3F000 + 10 is not, and so it should not work. Are you sure you did not mean "0x3F000 + 0x10" (which is word aligned)?

Regards,
Terje