write struct to flash

[Aduka_27]

Hi guys,

I just want to ask you is it possible to write a struct into flash using sd_flash_write() function. I can successfully write and ready INT values, but the problem occurs when I want to write and read a structure. I have already tried to define a pointer as struct structName *pointer_name, but there is always a warning message that informs me the pointer is not compatible with sd_flash_write(). Can you please help me to solve this problem.

Br,

Adnan.

[Jared]

Hi,

Use the FDS module, See this case on how.

regards

Jared 

[Aduka_27]

Hi,

I am using nRF Mesh SDK including softdevice. In that case, I am not sure is it possible to use the FDS module in the mesh part? 

Br,

Adnan.

[Jared]

Hi,

Indeed, if you use Mesh SDK then you should use the flash manager and the flash manager API.

regards

Jared

[Aduka_27]

Is it possible to use softdevice APIs in Mesh, as I tried in my example: 

Write function inside which I call sd_flash_page_erase that automatically goes inside sys callback function:

void write_Tasks(){

    if(flash_status != FLASH_IDLE){
    
        __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Flash is busy in status %d. Try again later! \n", flash_status); 
        return 1;
    }else{
        
        uint32_t err_code = sd_flash_page_erase(pg_num_task);
        if (err_code != 0){
            
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Fatal error in task list erase function: err_code is %d \n", err_code);
        }
        flash_status = LIST_WRITE; 
    }
}

This is the way how I use sd_flash_write function, but I think here is an issue:

if(flash_status == LIST_WRITE){
 
            uint32_t err_code = sd_flash_write(pointer_task, task_list, 12);
            nrf_delay_ms(100);
            if(err_code != 0){
            
                __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Fatal error in task list write function: err_code is %d \n", err_code);
            }
            flash_status = LIST_FINISHED;

And finally this is the way how I define a free space: 

uint 32_t pg_size_task = NRF_FICR->CODEPAGESIZE;
uint32_t pg_num_task = NRF_FICR->CODESIZE-4;
struct TaskInstance *pointer_task = (struct TaskInstance *)(pg_size_task * pg_num_task);

Is it possible to finish my code in this way, keeping these functions? Thanks in advance!

Br,

Adnan.

[Aduka_27]

And also one extra question, my struct looks like this: 

struct name1{

    (enum) enum1 enum_name;
    struct name2 xyz[2];
    int int_value;
};

Is it possible to store it in the flash if it looks like this with int, enum and another struct in itself?

Br,

Adnan.

[Jared]

Hi,

It's perfectly fine to save a struct in flash. Regarding your choice to use the Softdevice API directly, this is not recommended, I strongly suggest that you use the flash manager instead.

regards

Jared