Can't manage to read from flash

RE: Can't manage to read from flash

FormerMember — Tue, 23 May 2017 10:52:45 GMT

This problem is continued in this thread.

RE: Can't manage to read from flash

Lola — Mon, 22 May 2017 16:41:30 GMT

So after trying and reading everything, I can say that the problem is that when I write, I get no callback on the fds_evt_handler , which DOES give me a callback when I init the fds. I MUST say that this code works together with the blu_uart, I have tried to set the ble after it, and also before it, non worked. What else could I explore here ? there are no error messages when I write, nothing happens, I even get success(=0) on the ret value after I write. Maybe the process is wrong ?

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 15:27:58 GMT

Also full description of FDS is here

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 15:26:21 GMT

By the way, see if this thread can help you link text

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 15:23:36 GMT

I can't tell you at the moment why no event come up but regarding full chip, as far as I understand you need to call fds_record_write once to create record in flash. If you want to update record in flash then fds_record_update has to be called.

RE: Can't manage to read from flash

Lola — Mon, 22 May 2017 15:08:49 GMT

Thanks a lot, i erased the chip, now we back to the previous one, where nothing happens after the save.. means there is no error and the handler is not being called (only on init)

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 15:05:18 GMT

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");

RE: Can't manage to read from flash

Lola — Mon, 22 May 2017 14:54:31 GMT

Thanks it's 7 , where do I find what 7 is ? does it means FDS_ERR_NO_SPACE_IN_FLASH ? if so , how is that possible?

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 14:39:49 GMT

In Write function you have:

  ret_code_t ret = fds_record_write(&record_desc, &record);
  if (ret != FDS_SUCCESS)
  {
       NRF_LOG_INFO("FAILED TO SAVE\r\n"); 
  }

What is the value of ret variable when you have FAILED TO SAVE? Then find description of fds_record_write to find out error code explanation

RE: Can't manage to read from flash

Lola — Mon, 22 May 2017 14:37:24 GMT

What? I am not sure I get what you are saying, find it where ? and what to do with it ?

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 14:09:01 GMT

You need to find out ret code from fds_record_write(&record_desc, &record);

RE: Can't manage to read from flash

Lola — Mon, 22 May 2017 14:05:50 GMT

Yes, I receive the init event good ,thanks. Well now it suddenly started printing "FAILED TO SAVE" ( please take a look at the write() function where I print it)

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 14:01:20 GMT

Do you receive FDS_EVT_INIT?

RE: Can't manage to read from flash

Lola — Mon, 22 May 2017 13:55:40 GMT

@Alex It will not even get into the case FDS_EVT_WRITE , so I put your line in there and it will not print it at all.

RE: Can't manage to read from flash

Alex — Mon, 22 May 2017 13:53:01 GMT

It means Write started but not finished. Try in event handler log result:

       case FDS_EVT_WRITE:
NRF_LOG_INFO("write result %d\r\n",p_fds_evt->result); 
       if (p_fds_evt->result == FDS_SUCCESS)
           {
               write_flag=1;
                NRF_LOG_INFO("finish write\r\n"); 
           }