SD-FAT-Engine issues

Javalin · 2013-03-28 12:59

Hello all,

Having some issues with Kye's version 2.0 SD-MMC_FATEngine driver. Generally works well, but I am trying to recieve some serial data and then write it to a file - the driver keeps locking up at random times. Attached demo function which illustrates the problem. Am I missing something?

    long        StackSpace[150], DataStackSpace[300]
    byte        txDataBuffer[1000], txDataBufferFileName[13]

The object is being used in multiple cogs, using a lock.

    ' lock
    if(debugSDCardLock := locknew) == -1
        pst.str(string("NoSDLocks", 13))
    else
        pst.str(string("SDLockID="))
        pst.dec(debugSDCardLock)
        pst.tx(13)

    ' started with
    coginit(COG_PAC,FileSystemTest,@dataStackSpace)

the code :

PRI FileSystemTest | waitcounter

    ' quick and dirty file name
    txDataBufferFileName[0] := "d"
    txDataBufferFileName[1] := "a"
    txDataBufferFileName[2] := "t"
    txDataBufferFileName[3] := "a"
    txDataBufferFileName[4] := "2"
    txDataBufferFileName[5] := "."
    txDataBufferFileName[6] := "x"
    txDataBufferFileName[7] := "m"
    txDataBufferFileName[8] := "l"                                

    ' make up some data (ABCD....)
    repeat waitcounter from 0 to 15
        txDataBuffer[waitcounter] := waitcounter+65

    ' debug
    pst.str(@txDataBufferFileName)
    pst.tx(13)
    pst.str(@txDataBuffer)
    pst.tx(13)    

    
    repeat

        pst.str(string("Start:",13))        
    
        ' lock - wait till lock == true
        waitcounter := 0
        repeat until not lockset(debugSDCardLock) OR waitcounter > 50
            waitcnt(clkfreq/10+cnt)
            waitcounter++
         
        if waitcounter => 50
            pst.str(string("lock failed",13))

        else

            pst.str(string(" -> Lock OK",13))        
             
            if(FileExists(@txDataBufferFileName))
                SDCard.DeleteEntry(@txDataBufferFileName)
                pst.str(string("->deleted",13))
            else
                pst.str(string("->No File",13))                                
             
            pst.str(string("->Create File",13))        
            SDCard.newFile(@txDataBufferFileName)
            pst.str(string("->Open File",13))        
            SDCard.openFile(@txDataBufferFileName,"W")
                              
            repeat 10                              
                SDCard.WriteString(@txDataBuffer)
                pst.str(string("->Write....",13))                     
            
            pst.str(string("Close!",13))        
            SDCard.CloseFile
             
            lockclr(debugSDCardLock)        
             
            pst.str(string("SDataDone",13))


            waitcnt(clkfreq*2+cnt)

Typical console output, but can lockup in different places:

data2.xml
ABCDEFGHIJKLMNOP
Start:
 -> Lock OK
->deleted
->Create File

Grateful for any help, Thanks. Hopefully something simple. Sometimes it works once.

James

kuroneko · 2013-03-28 17:12

repeat until not lockset(debugSDCardLock) OR waitcounter > 50

if you never get the lock waitcounter will be 51 when the loop exits
if you get the lock waitcounter could be 0..49, 50 or 51

You could try something along the lines of

repeat until (locked := not lockset(debugSDCardLock)) OR waitcounter > 50

and then check locked first before you consider timeout (which is kind of built into !locked AND loop exit).

Cluso99 · 2013-03-29 14:13

IIRC the filename needs to be a string and therefore '0' terminated. It maybe that your byte allocation is zeroed, but you should not rely on this. Therefore, add the line
txDataBufferFileName[9] := 0
I haven't looked elsewhere at your code, so this might not be the problem.

SD-FAT-Engine issues

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