Hi all,
I am trying to save an UART variable I am receiving. My case is very similar to the example Flash Write Example, but I would write few bytes instead of the whole flash page it is possible?
My application uses a nRF52 and requires SDk13
Thanks
Sure, you can write single word (32 bits) into the flash. Just make sure it's "empty" (= 0xFFFFFFFF aka all bits set to 1) before writing otherwise your write will probably result into wrong data (flash technology cannot change 0 bits to 1 unless you erase whole page). This is one of main added values of all the pstorage/fstorage/FDS libraries, they should manage page erase, backup etc. so you do just "logical" operations and leave dealing with "physical" addressing to lower layer functions and module logic.
Sure, you can write single word (32 bits) into the flash. Just make sure it's "empty" (= 0xFFFFFFFF aka all bits set to 1) before writing otherwise your write will probably result into wrong data (flash technology cannot change 0 bits to 1 unless you erase whole page). This is one of main added values of all the pstorage/fstorage/FDS libraries, they should manage page erase, backup etc. so you do just "logical" operations and leave dealing with "physical" addressing to lower layer functions and module logic.
Its possible to write single byte (bit:) into the flash. Rest of bytes (bits) in 32-bit word must be set to 0xFF.
The write command must contain 32 bits, that what I was saying. Sure you can "change" only single bit which will effectively mean that you will "write" single bit.
I was using the UICR for the task, but I would go into troubles If I want edit the data your options are FSD?
What do you mean by "I was using the UICR for the task"? That is NVM region but with specific restrictions, you can basically just write one-time into few registers. For that classic routine should be used (as for any direct work with registers!): read out full 32-bit value, mask the bits you are modifying merge it with new value you want to push in. Then simply set the register (pointer to register 32-bit address in continuous address space of the chip) to new value and you are done. Or you meant UART not UICR? I'm confused.
I was using the UICR one-time registers and planning to move to another solutions like FDS. the problem with UICR registers it is not flexible (does not alllow multiple writes/edit) and I wont like to use a whole flash page if I want to use few bytes FDS case. What other practical solution exists?
