flash memory R/W

[hitsato]

I am using nRF 5 SDK v 14.2.0.

Store six items of data in flash memory with int or float,
In the program, the values ​​of the six items are acquired,
I want to operate with that value,
Including include and variables, coding method
I do not understand.
It is a simple sample program and it will be helpful if you let me know.

Thank you.

[Vidar Berg]

Hi,

Recommend you to have a look at our Flash Data Storage Example, it uses the Experimental: Flash Data Storage library to manage persistent storage.   

[hitsato]

Thank you for your reply.

I saw these two pages once, but after all I did not know which part of the sample to divert.
infocenter.nordicsemi.com/index.jsp
infocenter.nordicsemi.com/index.jsp

Also, I did not understand the difference between Flash Data Storage and Flash Storage.

It depends on being posted here.

When using Flash Data Storage,
What is necessary with include etc. other than logic,
In logic, the concrete procedure of writing and reading
We would like to have a professor only.

Sorry to trouble you, but thank you.

[Vidar Berg]

Did you see the "Usage" section of the FDS module documentation (link)? It should give an idea of what APIs  to use.

[hitsato]

From the information received, after the writing, reading operation confirmation and
In order to do debug, I tried it as follows,
With "fds_register" "fds_init" "fds_record_write" and "fds_record_find" added this time
Unknown function 0x000008C8
And it was impossible to confirm the operation of the sample itself.
The place of error is different every time debugging

////////////////////////////////////
//              FDS               //
////////////////////////////////////
// Simple event handler to handle errors during initialization.
static void fds_evt_handler(fds_evt_t const * p_fds_evt)
{
    ret_code_t ret;

    switch (p_fds_evt->id)
    {
        case FDS_EVT_INIT:
            if (p_fds_evt->result != FDS_SUCCESS)
            {
                // Initialization failed.
                //NRF_LOG_RAW_INFO("----(Initialization failed.)(p_fds_evt->result:%d----\n", (p_fds_evt->result);
                SEGGER_RTT_printf(0,"(Initialization failed.)p_fds_evt->result: %X \n",p_fds_evt->result);
            }
            break;

        default:
            break;
    }
}

/////////////////////////////////////
//  fds　test         　　         //
/////////////////////////////////////
ble_stack_init();

ret_code_t ret = fds_register(fds_evt_handler);
if (ret != FDS_SUCCESS)
{
    /* fds_register error. */
    NRF_LOG_RAW_INFO("----(fds_register error.)ret:%d----\n", ret);
}

ret = fds_init();
if (ret != FDS_SUCCESS)
{
    /* fds_init error. */
    NRF_LOG_RAW_INFO("----(fds_init error.)ret:%d----\n", ret);
}

#define FILE_ID         0x0001  /* The ID of the file to write the records into. */
#define RECORD_KEY_1    0x1111  /* A key for the first record. */
#define RECORD_KEY_2    0x2222  /* A key for the second record. */

static uint32_t   const m_deadbeef = 0xDEADBEEF;
static char       const m_hello[]  = "Hello, world!";

fds_record_t        record;
fds_record_desc_t   record_desc;

// Set up record.
record.file_id           = FILE_ID;
record.key               = RECORD_KEY_1;
record.data.p_data       = &m_deadbeef;
record.data.length_words = 1;   /* one word is four bytes. */

ret_code_t rc;
rc = fds_record_write(&record_desc, &record);
if (rc != FDS_SUCCESS)
{
    /* Handle error. */
    NRF_LOG_RAW_INFO("----(Handle error.)rc:%d----\n", rc);
}

// Set up record.
//record.file_id           = FILE_ID;
//record.key               = RECORD_KEY_2;
//record.data.p_data       = &m_hello;
///* The following calculation takes into account any eventual remainder of the division. */
//record.data.length_words = (sizeof(m_hello) + 3) / 4;
//
//rc = fds_record_write(&record_desc, &record);
//if (rc != FDS_SUCCESS)
//{
//    /* Handle error. */
//    NRF_LOG_RAW_INFO("----(Handle error.)rc:%d----\n", rc);
//
//}

// Set up record.
record.file_id           = FILE_ID;
record.key               = RECORD_KEY_1;

fds_flash_record_t  flash_record;
fds_find_token_t    ftok;

/* It is required to zero the token before first use. */
memset(&ftok, 0x00, sizeof(fds_find_token_t));

/* Loop until all records with the given key and file ID have been found. */
for( ; ; )
{
    ret = fds_record_find(record.file_id, record.key , &record_desc, &ftok);
    if (ret != FDS_SUCCESS)
    {
        /* Handle error. */
        NRF_LOG_RAW_INFO("----(fds_record_find error.)ret:%d----\n", ret);
        break;
    }

    ret = fds_record_open(&record_desc, &flash_record);
    if (ret != FDS_SUCCESS)
    {
        /* Handle error. */
        NRF_LOG_RAW_INFO("----(fds_record_open error.)ret:%d----\n", ret);
    }

    /* Access the record through the flash_record structure. */

    /* Close the record when done. */
    ret = fds_record_close(&record_desc);
    if (ret != FDS_SUCCESS)
    {
        /* Handle error. */
        NRF_LOG_RAW_INFO("----(fds_record_close error.)ret:%d----\n", ret);
    }
}
/////////////////////////////////////

[hitsato]

Also, the data handled by fds this time is written from smartphone with Bluetooth,
I want to read the written value with this program,
Can you do it?