Expand error checks in _calculate_blocksize_match_tdbstore

The minimum size required by tdbstore is either 2 sectors or 10 pages,
whichever is larger. Correspondingly, adjust the error checks in
_calculate_blocksize_match_tdbstore to match this requirement.

Author: Kyle Kearney

features/storage/kvstore/conf/kv_config.cpp

@@ -176,13 +176,19 @@ int _calculate_blocksize_match_tdbstore(BlockDevice *bd)
 {
     bd_size_t size = bd->size();
     bd_size_t erase_size = bd->get_erase_size();
+    bd_size_t page_size = bd->get_program_size();
     bd_size_t number_of_sector = size / erase_size;
-
-    if (number_of_sector < 2) {
+    bd_size_t number_of_page = size / page_size;
+    if (number_of_sector < TDBStore::STORE_SECTORS) {
         tr_warning("KV Config: There are less than two sectors - TDBStore will not work.");
         return -1;
     }
 
+    if (number_of_page < TDBStore::STORE_PAGES) {
+        tr_warning("KV Config: There are less than ten pages sectors - TDBStore will not work.");
+        return -1;
+    }
+
 
     if (number_of_sector % 2 != 0) {
         tr_warning("KV Config: Number of sectors is not an even number. Consider changing the BlockDevice size");
@@ -575,9 +581,9 @@ int _create_internal_tdb(BlockDevice **internal_bd, KVStore **internal_tdb, bd_s
         return MBED_ERROR_FAILED_OPERATION ;
     }
 
-    //Check if TDBStore has at least 2 sector.
+    //Check if TDBStore has at least 2 sectors or 10 pages.
     if (_calculate_blocksize_match_tdbstore(*internal_bd) != MBED_SUCCESS) {
-        tr_error("KV Config: Can not create TDBStore with less then 2 sector.");
+        tr_error("KV Config: Can not create TDBStore with less then 2 sectors or 10 pages.");
         return MBED_ERROR_INVALID_ARGUMENT;
     }
 
@@ -743,9 +749,9 @@ int _storage_config_tdb_external_common()
         return MBED_ERROR_FAILED_OPERATION ;
     }
 
-    //Check that there is at least 2 sector for the external TDBStore
+    //Check that there is at least 2 sectors for the external TDBStore
     if (_calculate_blocksize_match_tdbstore(kvstore_config.external_bd) != MBED_SUCCESS) {
-        tr_error("KV Config: Can not create TDBStore with less then 2 sector.");
+        tr_error("KV Config: Can not create TDBStore with less then 2 sectors or 10 pages.");
         return MBED_ERROR_INVALID_SIZE;
     }
 

features/storage/kvstore/tdbstore/TDBStore.cpp

@@ -1463,11 +1463,6 @@ int TDBStore::get_default_flash_addresses(bd_addr_t *start_address, bd_size_t *s
         return MBED_ERROR_INITIALIZATION_FAILED;
     }
 
-    // Use the last 2 sectors or 10 pages of flash for the TDBStore by default (whichever is larger)
-    // For each area: must be a minimum of 1 page of reserved and 2 pages for master record
-    static const int STORE_SECTORS = 2;
-    static const int STORE_PAGES = 10;
-
     // Let's work from end of the flash backwards
     bd_addr_t curr_addr = flash.get_flash_start() + flash.get_flash_size();
     bd_size_t sector_space = 0;

features/storage/kvstore/tdbstore/TDBStore.h

@@ -36,6 +36,13 @@ class TDBStore : public KVStore {
 
     static const uint32_t RESERVED_AREA_SIZE = 64;
 
+    // Use the last 2 sectors or 10 pages of flash for the TDBStore by default (whichever is larger)
+    // For each area: must be a minimum of 1 page of reserved and 2 pages for master record
+    /** Minimum number of internal flash sectors required for TDBStore */
+    static const int STORE_SECTORS = 2;
+    /** Minimum number of internal flash pages required for TDBStore */
+    static const int STORE_PAGES = 10;
+
     /**
      * @brief Class constructor
      *