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File System fopen() Problem

I get into this problem. I have a thread that process a message queue. One of my possible action on reception of a message is to open a file with the function fopen(). The file is located on a USB flashdisk and I am opening it with the option "w" :
Logfile = fopen("U:\\Log.txt", "w");

I am using this file for logging. For testing purpose I am entering 200 values coming from ADC and then closing the file.

The first time the message is processed everything is fine. Now , the second time the message is received and process, the fopen() function is stalling for at least a minute then return with success and complete the following processing. I have noticed also that the connect and disconnect detection is not functioning normally too after the first fopen()/fclose().

Any ideas what could be the problem? Anything I need to know when opening, writing and closing a file?

Thank you

0 re yoReinhard Keil over 10 years ago

Which version of the File System are you using?
What is your target hardware?
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0 Keaven Pineau over 10 years ago in reply to re yoReinhard Keil

Hi,

I am using the version 6.4.0 of the file system. I am working on 3 different boards : STM32F4-Discovery, STM32429i-Eval and MCBST32F400. The media is a 8 GB USB key connected on USB Full Speed port.
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0 Christopher Seidl

over 10 years ago in reply to Keaven Pineau

Hello Keaven,

I have tried with the following code on the 429I-Discovery board:

void Thread (void const *argument ) {
  static unsigned int result;
  static FILE *f;
  uint8_t i = 0;

  USBH_Initialize (0);

  while (1) {
    result = USBH_MSC_DriveMount ("U0:");
    if (result == USBH_MSC_OK) {
      memset(fbuf, ++i, sizeof(fbuf));
      f = fopen ("Test.txt", "w");
      if (f != NULL) {
        LED_On(0);
        fwrite (fbuf, sizeof(fbuf), 1, f);
        fclose (f);
        LED_Off(0);
      }
    }
    osDelay (1);
  }
}

Everything works as expected. Have you changed anything in the FS_Config_USB_0.h? What are your settings for the thread stacks (Default, Main, Total) in RTX_Conf_CM.c?

Kind regards,

Christopher