Access to disk_sys

2020-02-27T21:03:40.123000Z

Ok, I found the problem. Even the SysLibAsync commands takes up to 15 ms and set a watchdog for task with 10ms cicles. So a good idea to manipulate files are always use a second task.

Access to disk_sys

2020-02-27T21:03:36.152000Z

Ok, I see, but I thought that SysLibFileAsync should execute that asynchronously and avoid watchdog timeouts.

Access to disk_sys

2020-02-27T21:03:34.678000Z

Hi,
try to execute read/write operations in a separate low priority task with enough cycletime.
SysFileOpen can take up to 100ms and SysFileWrite can take several 100ms.

That should be the source of your watchdog

Access to disk_sys

2020-02-27T21:03:33.240000Z

Helo,

I'm trying to access files from internal memory (create, open and write), but even using SysLibAsync I still getting watchdog timout when try to execute de open command.

The code that I wrote for tests are below. Any idea of what I can do to avoid that watchdog exception?

SYSFILE_OPEN : SysFileOpenAsync;
SYSFILE_CLOSE : SysFileCloseAsync;
SYSFILE_WRITE : SysFileWriteAsync;
BUFFER : STRING := 'test';
FILE : DWORD := 0;
WRITEN : DWORD;
ERROR : BOOL;
ERRORID : WORD;
ESTADO : INT := 0;
PRONTO : BOOL;

CASE ESTADO OF
0: (Abrindo o arquivo)
SYSFILE_OPEN(stFileName := '\My Documents\teste.txt', stMode := 'a', bEnable := TRUE, hFile => FILE, bError=> ERROR, wErrorID => ERRORID, bDone => PRONTO);
IF PRONTO THEN
ESTADO := 1;
END_IF
1: (Escrevendo no arquivo)
SYSFILE_WRITE(hFile := FILE, pBuffer := ADR(BUFFER ), dwSize:= SIZEOF(BUFFER ), bError=> ERROR, wErrorID => ERRORID, dwWrite => WRITEN, bEnable := TRUE, bDone => PRONTO);
IF PRONTO THEN
ESTADO := 2;
END_IF
2: (Fechando o arquivo)
SYSFILE_CLOSE(hFile := FILE, bEnable := TRUE, bDone => PRONTO);
IF PRONTO THEN
SYSFILE_OPEN(bEnable := FALSE);
SYSFILE_WRITE(bEnable := FALSE);
SYSFILE_CLOSE(bEnable := FALSE);
ESTADO := 0;
END_IF
ELSE
ESTADO := 0;
END_CASE

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