Arduino_UnifiedStorage::debuggingModeEnabled and InternalStorage::readPartitions() report different number of partitions

[aliphys]

The Arduino_UnifiedStorage library provides the following two ways to access information about the partitions on the Internal storage, both of which are exhibited in SimpleStorageWriteRead.ino:

• Arduino_UnifiedStorage::debuggingModeEnabled = true;
  • This prints information about the storage media operations to the Serial Monitor.
• std::vector<Partition> partitions = InternalStorage::readPartitions();
  • The function InternalStorage::readPartitions() is called to retrieve a list of partition configurations from the internal storage of the device. This is stored as a dynamically resizable array of objects, in this case partitions

However, each approach has its own reality as to what partitions exist. As an example, if we format the Portenta H7 Internal storage to have a single 12MB FAT partition (by uploading the AUS_SPIS_FORMAT_001 sketch):

• The debug messages tell us that there are four partitions, one of which is FAT

[Partitioning][readPartitions][INFO] Partition 1 is formatted with FAT file system
[Partitioning][readPartitions][INFO] Partition 2 is empty, skipping
[Partitioning][readPartitions][INFO] Partition 3 is empty, skipping
[Partitioning][readPartitions][INFO] Partition 4 is empty, skipping

• The partitions vector (as defined above) shows that only one partition exists

Partition: 1
Size: 12284
Type: FAT

There should be no difference between the number of partitions reported by both approaches.

[aliphys]

Full Serial Monitor for three relevant test cases on both the Portenta H7 and Portenta C33 are presented below.

Portenta H7

Test Case	Description	Serial Monitor
AUS_SPIS_FORMAT_001	Format 12MB FAT Partition on Portenta H7	--- Test Case ID: AUS_SPIS_FORMAT_001 --- Arduino_UnifiedStorage debug messages ON. [Partitioning][isPartitioningSchemeValid][INFO] Partitioning Scheme is Valid [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][INFO] Partition 1 created [Partitioning][formatPartition][INFO] Formatting partition 1 [Partitioning][formatPartition][INFO] Partition 1 formatted successfully [Partitioning][readPartitions][INFO] Partition 1 is formatted with FAT file system [Partitioning][readPartitions][INFO] Partition 2 is empty, skipping [Partitioning][readPartitions][INFO] Partition 3 is empty, skipping [Partitioning][readPartitions][INFO] Partition 4 is empty, skipping Partition: 1 Size: 12284 Type: FAT
AUS_SPIS_FORMAT_002	Format 12MB LittleFS Partition on Portenta H7	--- Test Case ID: AUS_SPIS_FORMAT_002 --- Arduino_UnifiedStorage debug messages ON. [Partitioning][isPartitioningSchemeValid][INFO] Partitioning Scheme is Valid [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][INFO] Partition 1 created [Partitioning][formatPartition][INFO] Formatting partition 1 [Partitioning][formatPartition][INFO] Partition 1 formatted successfully [Partitioning][readPartitions][INFO] Partition 1 is formatted with LittleFS file system [Partitioning][readPartitions][INFO] Partition 2 is empty, skipping [Partitioning][readPartitions][INFO] Partition 3 is empty, skipping [Partitioning][readPartitions][INFO] Partition 4 is empty, skipping Partition: 1 Size: 12284 Type: LitlleFS
AUS_SPIS_FORMAT_003	Format 6MB FAT + 6MB LittleFS Partition Portenta H7	--- Test Case ID: AUS_SPIS_FORMAT_003 --- Arduino_UnifiedStorage debug messages ON. [Partitioning][isPartitioningSchemeValid][INFO] Partitioning Scheme is Valid [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][INFO] Partition 1 created [Partitioning][formatPartition][INFO] Formatting partition 1 [Partitioning][formatPartition][INFO] Partition 1 formatted successfully [Partitioning][INFO] Partition 2 created [Partitioning][formatPartition][INFO] Formatting partition 2 [Partitioning][formatPartition][INFO] Partition 2 formatted successfully [Partitioning][readPartitions][INFO] Partition 1 is formatted with LittleFS file system [Partitioning][readPartitions][INFO] Partition 2 is formatted with FAT file system [Partitioning][readPartitions][INFO] Partition 3 is empty, skipping [Partitioning][readPartitions][INFO] Partition 4 is empty, skipping Partition: 1 Size: 6140 Type: LitlleFS Partition: 2 Size: 6144 Type: FAT

Portenta C33

Test Case	Description	Serial Monitor
AUS_SPIS_FORMAT_001	Format 12MB FAT Partition on Portenta C33	--- Test Case ID: AUS_SPIS_FORMAT_001 --- Arduino_UnifiedStorage debug messages ON. [Partitioning][isPartitioningSchemeValid][INFO] Partitioning Scheme is Valid [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][INFO] Partition 1 created [Partitioning][formatPartition][INFO] Formatting partition 1 [Partitioning][formatPartition][INFO] Partition 1 formatted successfully [Partitioning][readPartitions][INFO] Partition 1 is formatted with FAT file system [Partitioning][readPartitions][INFO] Partition 2 is empty, skipping [Partitioning][readPartitions][INFO] Partition 3 is empty, skipping [Partitioning][readPartitions][INFO] Partition 4 is empty, skipping Partition: 1 Size: 12284 Type: FAT
AUS_SPIS_FORMAT_002	Format 12MB LittleFS Partition on Portenta C33	--- Test Case ID: AUS_SPIS_FORMAT_002 --- Arduino_UnifiedStorage debug messages ON. [Partitioning][isPartitioningSchemeValid][INFO] Partitioning Scheme is Valid [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][INFO] Partition 1 created [Partitioning][formatPartition][INFO] Formatting partition 1 [Partitioning][formatPartition][INFO] Partition 1 formatted successfully [Partitioning][readPartitions][INFO] Partition 1 is formatted with LittleFS file system [Partitioning][readPartitions][INFO] Partition 2 is empty, skipping [Partitioning][readPartitions][INFO] Partition 3 is empty, skipping [Partitioning][readPartitions][INFO] Partition 4 is empty, skipping Partition: 1 Size: 12284 Type: LitlleFS
AUS_SPIS_FORMAT_003	Format 6MB FAT + 6MB LittleFS Partition Portenta C33	--- Test Case ID: AUS_SPIS_FORMAT_003 --- Arduino_UnifiedStorage debug messages ON. [Partitioning][isPartitioningSchemeValid][INFO] Partitioning Scheme is Valid [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][eraseMBRSector][INFO] MBR Sector Erased [Partitioning][INFO] Partition 1 created [Partitioning][formatPartition][INFO] Formatting partition 1 [Partitioning][formatPartition][INFO] Partition 1 formatted successfully [Partitioning][INFO] Partition 2 created [Partitioning][formatPartition][INFO] Formatting partition 2 [Partitioning][formatPartition][INFO] Partition 2 formatted successfully [Partitioning][readPartitions][INFO] Partition 1 is formatted with LittleFS file system [Partitioning][readPartitions][INFO] Partition 2 is formatted with FAT file system [Partitioning][readPartitions][INFO] Partition 3 is empty, skipping [Partitioning][readPartitions][INFO] Partition 4 is empty, skipping Partition: 1 Size: 6140 Type: LitlleFS Partition: 2 Size: 6144 Type: FAT

Note:

• The difference in reported partitions, exists similarly with both the Portenta H7 (mbed) and Portenta C33 (renesas). So unlikely that this is limited to a single platform.
• This is not limited to LittleFS or FAT. Issue exists when the internal storage is formatted as LittleFS and/or FAT.
• The function InternalStorage::readPartitions() reports LittleFS as LitlleFS. This typo is resolved in Ensure prettyPrintFileSystemType() returns correct spelling for LittleFS #44

[aliphys]

PR #39 rewrites functionality of the InternalStorage class which may fix issues presented here.