Saving & Reading a structure using FDS (Flash Data Storage) SDK15.3

[Ameer Usman]

I am trying to save and read a structure using FDS, how do I go about it?

I have the structure:

typedef struct
{
    uint16_t total_runhours_flash;
    float total_energy_consumed_flash;
}energy_struct;

energy_struct energy_variables;

Is this correct by populating the record as such?:

fds_record_t record;
fds_record_desc_t record_desc;

record.file_id = FILE_ID;
record.key = ENERGY_KEY;
record.data.p_data = &energy_variables;
record.data.length_words = sizeof(energy_variables);

fds_record_desc_t desc = {0};

rc = fds_record_update(&desc, &record);
APP_ERROR_CHECK(rc);

And to read is the main problem, I can't seem to match the types in which it would load data from the structure: (This is giving error)

energy_variables = (struct energy_struct *) config.p_data;

[Einar Thorsrud]

Hi,

The first two code snippets (defining a struct and writing it with FDS looks sensible). I am not sure what you want to convey in the last. What are you trying to do? What fails? If you need a simple example you can refer to this post. You can also refer to the FDS example, but it is a bit over-complicated.

[Ameer Usman]

In the last snip I am trying to read the structure I saved into a structure variable of the same kind but I dont believe it is working, maybe my data types are out of place?

[Ameer Usman]

So from the FDS example I kind of figured it out.

The write function would be like:

fds_record_t record;
fds_record_desc_t record_desc;

record.file_id = FILE_ID;
record.key = ENERGY_KEY;
record.data.p_data = &energy_variables;
record.data.length_words = ( sizeof(energy_variables) + 3 ) / sizeof(uint32_t);

fds_record_desc_t desc = {0};

rc = fds_record_update(&desc, &record);
APP_ERROR_CHECK(rc);

And for reading:

rc = fds_record_open(&desc, &config);
APP_ERROR_CHECK(rc);

memcpy(&energy_variables, config.p_data, sizeof(energy_struct));