nrf9160 : Writing to flash at a specified location using nrfjprog command line utility

[Aswin P V]

Hi,

We have a requirement where we need to store some application parameters (Eg. APN name ) in the nrf9160 flash. This parameters will be storing during production time by using the nrfjprog command line utility.

Our requirement is we need to write a binary file at a specified flash location( 0xFA000 ) in nrf and application code should able to read this.

We are able to use the 'memwr' option.

Eg: nrfjprog -f UNKNOWN --memwr 1024000 --val 0x00000105

However this can only be used to write 4 byte at a time. Can we able to write a file as a whole ( 4096 bytes file in form of .bin or .hex)?

Or is there any option to specify the offset where we write using the '--program <hex-file>' option in nrfjprog?

Thanks and regards,

Aswin

[Ivan Herrera]

An intel hex file (.hex) already contains data on the off-set (start-address) the data needs to be written to. 

https://en.wikipedia.org/wiki/Intel_HEX#Format

If you properly encode your hex file, you should just be able to program it using nrfjprog --program into place. 

[Aswin P V]

oh okay. The program command will only write in those location? Does it erase the other portion of flash?

[Ivan Herrera]

Correct. The programmer will only write in that location and leave the other flash untouched. It does not erase anything unless you specifically tell it to do so.