Simultaneous File I/O access to SD Drive using FAT and USB Msc device

Hello

I have the following setup 1)Hardware - a STM32F4xx Keil dev board type circuit 2)Middleware RL-USB with a composite configuration - Msc and Cdc connected to a Windows computer and 3:) RL-FLash FS (using a SD card running in native mode). It all running under RL RTX.

Everthing just about works... but when i use File I/O routines such as fcheck, ffind etc - (via the Usb Cdc interface) - it does not work. I tried fcheck - it comes back with a 1 - an error.

I did have this all working - I patched the ST USB device firmware together to make a composite driver, reworked the various ST routines and using the RL-Flash FS and got it all to work. When I say it worked - I don't mean having simultaneous access to files. The idea was to copy a file across using windows and then using a hyperterminal CLI interface to (with the Cdc interface) re-program the STM32Fxx flash. Ok so if was working why did I change it - well I was really hopping to use the Keil middleware in the project and then there is a very good chance there wont be any funny stuff. I had "funny stuff" on my ST code - sometimes - when hooked up to certain HP laptops.

I have tried variation on this theme - but it's not working.

....


FAT_VI      *mc0;
Media_INFO  info;


__task void init (void)
{
        CreateMailboxes();

        t_TerminalTask          = os_tsk_create (TerminalTask,5);
        t_LedTickTask           = os_tsk_create (LedTickTask,5);
        os_evt_set(EVENT_BOOTUP_COMPLETE,t_LedTickTask);

        t_I2C1Task              = os_tsk_create (I2C1Task,5);
        t_PowerManagmentTask    = os_tsk_create (PowerManagmentTask,2);
        t_ADCTask               = os_tsk_create (ADCTask, 2);
        os_evt_set(EVENT_BOOTUP_COMPLETE,t_PowerManagmentTask);


        usbd_init  ();

        mc0 = ioc_getcb (NULL);
        if (ioc_init (mc0) == 0)
                {
                ioc_read_info (&info, mc0);
                usbd_msc_init ();
                }
        usbd_connect(__TRUE);
        while (!usbd_configured ());


        os_tsk_delete_self ();
}

Any ideas? Does the RL-FS work with either the USB Msc or using the File I/O routines like fopen, fclose etc - but not both. There is a polling mechanism in the the Usb Msc to check if the drive is ready/available so it would seem to me that this is a viable possibility?

Many Thanks
Peter