how to store data[20][20] in flash using FDS

RE: how to store data[20][20] in flash using FDS

Ole Bauck — Fri, 30 Sep 2016 10:34:29 GMT

Hi, I just commented so that other people could find out that the discussion was taken elsewhere.

RE: how to store data[20][20] in flash using FDS

saiteja — Fri, 30 Sep 2016 09:45:21 GMT

hey sorry, no one is answered to that question. that question posted by me just before 20 minutes.

RE: how to store data[20][20] in flash using FDS

Ole Bauck — Fri, 30 Sep 2016 09:23:21 GMT

This will be answered in this question: devzone.nordicsemi.com/.../

RE: how to store data[20][20] in flash using FDS

saiteja — Thu, 29 Sep 2016 14:07:35 GMT

hi is it possible to store float array in fds. i am able to store int values but unable to store float values. i am using example in this link :- github.com/.../nRF52-fds-example

i am writing float m_deadbeef[20][3]; //////(LIKE this i need to store 5 arrays and i should retrieve it back)

here is how i am reading back data from FDS

float *data;
		
uint32_t err_code;
		
		NRF_LOG_PRINTF("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_PRINTF("Found Record ID = %d\r\n",record_desc.record_id);
				
NRF_LOG_PRINTF("Data = ");
				
data = (float *) flash_record.p_data;
				
for (uint8_t i=0;i<flash_record.p_header->tl.length_words;i++)
				
{
					
NRF_LOG_PRINTF("%f ",data[i]);
				
}
				
NRF_LOG_PRINTF("\r\n");

i am getting emty data

RE: how to store data[20][20] in flash using FDS

Ole Bauck — Tue, 20 Sep 2016 10:15:22 GMT

Here is an example that shows how to use FDS.

For storing 2 dimensional array just declare the data for example as:

static uint32_t m_data[2][2] = ...
...
record_chunk.p_data         = m_data;
record_chunk.length_words   = sizeof(m_data)/sizeof(uint32_t);

The content will be stored sequentially (data[0][0], data[0][1] ... data[0][n], data[1][0], data[1][1] ...).