How to write, read and store uint8_t data_array via FDS

Question

Hello everybody, I used SDK14.2.0 , S132 . I keep the data from nus_data in the uint8_t array. Then I am trying to write the array with use fds_write. My fds_write function; static ret_code_t kls_fds_write(uint32_t file_id, uint32_t record_key , uint8_t write_data[]) { fds_record_t record; fds_record_desc_t record_desc; // Set up record. record.file_id = file_id; record.key = record_key; record.data.p_data = &write_data; record.data.length_words = (sizeof(write_data) + 3) / 4; //sizeof(write_data); //(sizeof(write_data) + 3) / sizeof(uint32_t); ret_code_t rc; rc = fds_record_write(&record_desc, &record); if (rc != FDS_SUCCESS) { /* Handle error. */ NRF_LOG_INFO("FDS Write Handle error."); return rc; } NRF_LOG_INFO("Writing Record ID = %d ",record_desc.record_id); return NRF_SUCCESS; } I use my fds_write function by this way; static void save_data( uint8_t *p_data) { NRF_LOG_INFO("save_data"); uint8_t source_data_0[10] ; // assign source datas ******************************** for (uint32_t i = 0; i < 10; i++) { source_data_0[i] = p_data[i]; } while (flag_write_fds == false); kls_fds_write(FILE_ID, RECORD_KEY, source_data_0); NRF_LOG_HEXDUMP_INFO(source_data_0, sizeof(source_data_0)); allow_advertisement = false; } Then I am trying to read and store the data into another array. My fds_read function; static ret_code_t kls_fds_read(uint32_t file_id, uint32_t relevant_record_key , uint8_t read_data[]) { fds_flash_record_t flash_record; fds_record_desc_t record_desc; fds_find_token_t ftok; fds_record_t record; /* It is required to zero the token before first use. */ memset(&ftok, 0x00, sizeof(fds_find_token_t)); uint32_t err_code; NRF_LOG_INFO("Start searching... "); // Loop until all records with the given key and file ID have been found. while (fds_record_find(file_id, relevant_record_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 ",record_desc.record_id); uint8_t * pointer_to_record_data; pointer_to_record_data = (uint8_t *)record.data.p_data; if(flash_record.p_header->record_key == relevant_record_key) { for(uint8_t i = 0; i < 10; i++) { read_data[i] = *pointer_to_record_data; pointer_to_record_data++; } } NRF_LOG_INFO("Data = "); NRF_LOG_HEXDUMP_INFO(read_data, sizeof(read_data)); NRF_LOG_INFO(" "); // 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; } I use my fds_read function by this way; static void first_Setup(void) { NRF_LOG_INFO("first_Setup Start"); uint8_t dest_data_0[10] = {0}; while (flag_write_fds == 0); kls_fds_read(FILE_ID, RECORD_KEY, dest_data_0); NRF_LOG_INFO("dest_data_0 : "); NRF_LOG_HEXDUMP_INFO(dest_data_0, 10); } I can write and read something but these are not meaningful data. Or I can not read the data I wrote because of anything. I obviously could not figure out exactly where the problem was. The steps I want to take are as follows; Store particular nus_data into an array (uint8_t source_data_0[10] ) -> I'm already doing this. No problem. Write the stored array(uint8_t source_data_0[10] ) via FDS -> I do that already, but I do not know exactly whether it is successful. Read the stored array (uint8_t source_data_0[10] )via FDS and Store the read array(source_data_0[10] ) in another array (uint8_t dest_data_0[10] = {0}). Test Result; I sent the nus data( "aaaaaaaaaa" ) and I can store it into source_data_0[] successfully. Then I use my fds_write function; 0> app: save_data 0> app: Writing Record ID = 1 0> 0> app: 61 61 61 61 61 61 61 61|aaaaaaaa 0> app: 61 61 |aa Finally I tried to read and result is; 0> app: first_Setup Start 0> app: Start searching... 0> 0> app: Found Record ID = 1 0> 0> app: Data = 0> app: 00 04 00 20 |... 0> app: 0> 0> app: dest_data_0 : 0> app: 00 04 00 20 E9 08 00 00|... é... 0> app: 7D 05 |}. As a result; The data I read is not the same as the data I write . May be I read it in the wrong format, I do not know exactly. So, Do you have any suggestion ?

purgoufr · Accepted Answer

Hi Haakonsh, 
 Thank you very much for your interest. I reach the solution through another question. But I learned a lot from your answers. So I wanted to share the situation with you. 
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How to write, read and store uint8_t data_array via FDS

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