Can't manage to read from flash

[Lola]

Hi, Following the docs I think I am able to write to flash but it will not read anything .

This is how I set it up, write and read :

 static void sys_evt_dispatch(uint32_t sys_evt)
{
    fs_sys_event_handler(sys_evt);
    ble_advertising_on_sys_evt(sys_evt);
}


static void fds_evt_handler(fds_evt_t const * const p_fds_evt)
{
    switch (p_fds_evt->id)
    {
        case FDS_EVT_INIT:
            if (p_fds_evt->result != FDS_SUCCESS)
            {
                 NRF_LOG_INFO("failed initializing\r\n"); 
            }
            
            break;

       case FDS_EVT_WRITE:

       if (p_fds_evt->result == FDS_SUCCESS)
           {
               write_flag=1;
                NRF_LOG_INFO("finish write\r\n"); 
           }
      break;

        default:
            break;
    }
}



void initStorage()
{

        ret_code_t ret = fds_register(fds_evt_handler);
        if (ret != FDS_SUCCESS)
        {
            NRF_LOG_INFO("FAILED TO INIT STORAGE\r\n"); 
        }
        ret = fds_init();
        if (ret != FDS_SUCCESS)
        {
            NRF_LOG_INFO("ERROR INIT\r\n"); 
        }
        else
        NRF_LOG_INFO("INIT IT \r\n"); 

     


}


  void  write()
{
      #define FILE_ID     0x1111
      #define REC_KEY     0x2222
      static uint32_t const m_deadbeef = 0xDEADBEEF;
      fds_record_t        record;
      fds_record_desc_t   record_desc;
      fds_record_chunk_t  record_chunk;
      // Set up data.
      record_chunk.p_data         = &m_deadbeef;
      record_chunk.length_words   = 1;
      // Set up record.
      record.file_id                  = FILE_ID;
      record.key               = REC_KEY;
      record.data.p_chunks       = &record_chunk;
      record.data.num_chunks   = 1;
    
      ret_code_t ret = fds_record_write(&record_desc, &record);
      if (ret != FDS_SUCCESS)
      {
           NRF_LOG_INFO("FAILED TO SAVE\r\n"); 
      }

          else
 NRF_LOG_INFO("Writing Record ID = %d \r\n",record_desc.record_id);



}


void read ()
{
      NRF_LOG_INFO("START READING\r\n"); 

      #define FILE_ID     0x1111
      #define REC_KEY     0x2222
      fds_flash_record_t  flash_record;
      fds_record_desc_t   record_desc;
      fds_find_token_t    ftok={0};
      // Loop until all records with the given key and file ID have been found.
      while (fds_record_find(FILE_ID, REC_KEY, &record_desc, &ftok) == FDS_SUCCESS)
      {
         NRF_LOG_INFO("FOUND SOMETHING\r\n");
          if (fds_record_open(&record_desc, &flash_record) != FDS_SUCCESS)
          {
             NRF_LOG_INFO("ERROR OPEN\r\n"); 
          }
          // Access the record through the flash_record structure.

          NRF_LOG_INFO("Found Record ID = %d\r\n",record_desc.record_id);
          //NRF_LOG_INFO("Found data = %s\r\n",flash_record.p_data);

           


          // Close the record when done.
          if (fds_record_close(&record_desc) != FDS_SUCCESS)
          {
              NRF_LOG_INFO("ERROR CLOSE\r\n"); 
          }
      }


}

I can see that there are no errors so it means I am able to init and write with :

   initStorage();


     nrf_delay_ms(1000);
     write();
     nrf_delay_ms(1000);
     read ();

You can see on the log that the FDS_EVT_WRITE will not be called but I do get a record write ID ! The log :

:INFO:PROGRAM STARTED
:INFO:INIT IT 
:INFO:Writing Record ID = 1 
:INFO:START READING

[Alex]

I don't know what happened but suspect that you run your code several times and it allocates record every time so you run out of space. Try to erase chip, program code and start it again printing all events, even unsuccessful:

static void fds_evt_handler(fds_evt_t const * const p_fds_evt)
{
    switch (p_fds_evt->id)
    {
NRF_LOG_INFO("fds event: %d %d\r\n", p_fds_evt->id, (p_fds_evt->result);
        case FDS_EVT_INIT:
            if (p_fds_evt->result != FDS_SUCCESS)
            {
                 NRF_LOG_INFO("failed initializing\r\n");