FDS save under same id and key

[Moritz]

Hey, I want to save stuff to flash under the same id and key which should be no problem as shown in the documentation. But when I save it and retrieve the data only the last saved data is in both of the entries. I use SDK 13.

Here is the relevant code.

static ret_code_t fds_read(void)
{
		#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};//Important, make sure you zero init the ftok token
		uint32_t *data;
		uint32_t err_code;
		
		NRF_LOG_INFO("Start searching... \r\n");
		// 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)
		{
				err_code = fds_record_open(&record_desc, &flash_record);
				if ( err_code != FDS_SUCCESS)
				{
					return err_code;		
				}
				
				NRF_LOG_INFO("Found Record ID = %d\r\n",record_desc.record_id);
				NRF_LOG_INFO("Data = ");
				data = (uint32_t *) flash_record.p_data;
				for (uint8_t i=0;i<flash_record.p_header->tl.length_words;i++)
				{
					NRF_LOG_INFO("0x%x ",data[i]);
              
				}
				NRF_LOG_INFO("\r\n");
				// Access the record through the flash_record structure.
				// Close the record when done.
				err_code = fds_record_close(&record_desc);
				if (err_code != FDS_SUCCESS)
				{
					return err_code;	
				}
		}
		return NRF_SUCCESS;
		
} 

And here the write function:

static ret_code_t fds_test_write(void)
{
		#define FILE_ID     0x1111
		#define REC_KEY     0x2222
		static uint32_t m_deadbeef[2] = {0xDEADBEEF,0xBAADF00D};
		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   = 2;
		// Set up record.
		record.file_id              = FILE_ID;
		record.key              		= REC_KEY;
		record.data.p_chunks       = &record_chunk;
		record.data.num_chunks   = 1;
			
                write_flag = 0;
		ret_code_t ret = fds_record_write(&record_desc, &record);
		if (ret != FDS_SUCCESS)
		{
				return ret;
		}
		 NRF_LOG_INFO("Writing Record ID = %d \r\n",record_desc.record_id);

                m_deadbeef[0] = 1;
                m_deadbeef[1] = 2;
                // Set up data.
		record_chunk.p_data         = m_deadbeef;
		record_chunk.length_words   = 2;
		// Set up record.
		record.file_id              = FILE_ID;
		record.key              		= REC_KEY;
		record.data.p_chunks       = &record_chunk;
		record.data.num_chunks   = 1;

		while (write_flag==0);	
                write_flag = 0;
		ret = fds_record_write(&record_desc, &record);
		if (ret != FDS_SUCCESS)
		{
				return ret;
		}
		 NRF_LOG_INFO("Writing Record ID = %d \r\n",record_desc.record_id);
}

The relevant output is this.

APP:INFO:Writing Record ID = 7 
APP:INFO:Writing Record ID = 8 
APP:INFO:Start searching... 
APP:INFO:Found Record ID = 7
APP:INFO:Data = APP:INFO:0x1 APP:INFO:0x2 APP:INFO:
APP:INFO:Found Record ID = 8
APP:INFO:Data = APP:INFO:0x1 APP:INFO:0x2 APP:INFO:

Anyone knows whats wrong? Thanks in advance.

[Moritz]

I did a workaround now and just gave every set of data its own rec_key some more lines of code but it works now.

[Petter Myhre]

Could you share your complete project so I can test it here?

[Moritz]

drive.google.com/open

here is the project. I programm in segger embeded studio, so i hope the Keil project still works. I can compile it but cant flash it because of the code limitation.

[Petter Myhre]

You shouldn't change the data pointed to before you get the successful FDS_EVT_WRITE event.

So, do something like:

while (write_flag==0);	
        
m_deadbeef[0] = 1;
m_deadbeef[1] = 2;

[Moritz]

works and makes sense. My idea was to speed things up and check for the write process when I already set the data. Thanks a lot.