B4R Question Issues with the ESP8266 FileSystem

Discussion in 'B4R Questions' started by Marcel Cornelisse, Dec 18, 2017.

  1. Marcel Cornelisse

    Marcel Cornelisse New Member Licensed User

    I'm new to the platform so I apologize upfront in case this turns out to be a stupid question.

    I have an ESP01 (ESP8266) module and I want to store some data that will survive restarts of the ESP01. If I understood well, one of the options to achieve this is to use the ESP8266 file system implemented by the rESP8266FileSystem (V1.0) library. I used code as shown. The code doesnt work and I dont see any errors at runtime either.

    The logging indicates there are 10 bytes written which is as I expected, but there are 0 bytes (no data) read and the file position remains 0

    Furthermore the ListFiles Sub doesnt list any files at all, although the ReadFile Sub can find the file. I also tried to format the file system first (code removed), but that doesnt help either.

    What am I doing wrong?

    #Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 1000
    #End Region

    Sub Process_Globals
    Public Serial1 As Serial
    Private fs As ESP8266FileSystem
    Private myFile As String = "myFiles/file1"
    End Sub

    Private Sub AppStart
    End Sub

    Sub Start
    If(fs.initialize) Then
    Log(" file system successfully initialized")
    Log("could not initialize filesystem")
    End If


    End Sub

    Sub WriteFile
    If (fs.OpenReadWrite(myFile)) Then
    Log("file successfyully openend for write processing")
    Private buffer(10As Byte ="1234567890".GetBytes
    Log("Bytes written: ", fs.Stream.WriteBytes(buffer,0,buffer.Length))
    Log("file system total size ", fs.TotalSize)
    Log("file system used size ", fs.UsedSize)
    Log("file size ", fs.CurrentFile.size)
    End If
    End Sub

    Sub Readfile
    If (fs.OpenRead(myFile)) Then
    Log("file successfyully openend for read processing")
    Log("file name ", fs.CurrentFile.Name)
    Log("file size ", fs.CurrentFile.size)
    Private buffer(10As Byte
    Log ("number of bytes read: ", fs.Stream.ReadBytes(buffer,0,buffer.Length))
    Log("position after reading file: ", fs.Position)
    Private conv As ByteConverter
    Log("data read: ", conv.StringFromBytes(buffer))
    Log("cannot open file for read: ", myFile)
    End If

    End Sub

    Sub ListFiles
    For Each f As File In fs.ListFiles("/")
    Log("Name: ", f.Name, ", Size: ", f.Size)
    End Sub
  2. Erel

    Erel Administrator Staff Member Licensed User

    Your code looks correct. This is the output when I run it:

    file system successfully initialized
    file successfyully openend for write processing
    Bytes written: 10
    file system total size 2949250
    file system used size 100651
    file size 10
    file successfyully openend for read processing
    file name myFiles/file1
    file size 10
    number of bytes read: 10
    position after reading file: 10
    data read: 1234567890

    Try to set the Flash Size in the board configuration to 4M3M.
  3. Marcel Cornelisse

    Marcel Cornelisse New Member Licensed User

    Hi Erel,
    Thx for your fast response. Glad to see my code is correct :).
    I tried your suggestion but this made the program crash immediately with the following message:

    ets Jan 8 2013,rst cause:4, boot mode1,7)
    wdt reset

    Although Im pretty sure I have a 1M/512 board (ESP01), I tried some other flash configurations as well.
    None of them worked.

    Before using B4R, I have used the Expressif flash tool to blank the flash. I also used the Arduino "eeprom_clear" sketch to clear the EEPROM.
    Could this have permanently damaged the file system?

    There is some good news as well, storing data into flash using the rEEPROM library works fine.
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