请教一个关于rtx的问题

mewan · 发表于 2016-5-23 15:53:07

我用rtx和fatfs的时候开启多任务,经常出现死机的情况,我看安福莱的例子里也有好多没有使用多任务支持.

/*------------------------------------------------------------------------*/
/* Sample code of OS dependent controls for FatFs                      */
/* (C)ChaN, 2014                                                       */
/*------------------------------------------------------------------------*/

#include "ff.h"

#if _FS_REENTRANT
/*------------------------------------------------------------------------*/
/* Create a Synchronization Object
/*------------------------------------------------------------------------*/
/* This function is called in f_mount() function to create a new
/  synchronization object, such as semaphore and mutex. When a 0 is returned,
/  the f_mount() function fails with FR_INT_ERR.
*/
_SYNC_t fs_MUX;

int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create the sync object */
BYTE vol,          /* Corresponding volume (logical drive number) */
_SYNC_t *sobj       /* Pointer to return the created sync object */
)
{
int ret;

// *sobj = CreateMutex(NULL, FALSE, NULL);       /* Win32 */
// ret = (int)(*sobj != INVALID_HANDLE_VALUE);

// *sobj = SyncObjects[vol];          /* uITRON (give a static sync object) */
// ret = 1;                         /* The initial value of the semaphore must be 1. */

// *sobj = OSMutexCreate(0, &err);       /* uC/OS-II */
// ret = (int)(err == OS_NO_ERR);

// *sobj = xSemaphoreCreateMutex(); /* FreeRTOS */
// ret = (int)(*sobj != NULL);

os_mut_init(sobj);
ret = (int)(*sobj != 0);
return ret;
}

/*------------------------------------------------------------------------*/
/* Delete a Synchronization Object                                     */
/*------------------------------------------------------------------------*/
/* This function is called in f_mount() function to delete a synchronization
/  object that created with ff_cre_syncobj() function. When a 0 is returned,
/  the f_mount() function fails with FR_INT_ERR.
*/

int ff_del_syncobj ( /* 1:Function succeeded, 0:Could not delete due to any error */
_SYNC_t sobj       /* Sync object tied to the logical drive to be deleted */
)
{
int ret;

// ret = CloseHandle(sobj); /* Win32 */

// ret = 1;                   /* uITRON (nothing to do) */

// OSMutexDel(sobj, OS_DEL_ALWAYS, &err); /* uC/OS-II */
// ret = (int)(err == OS_NO_ERR);

//  vSemaphoreDelete(sobj);       /* FreeRTOS */
// ret = 1;

sobj = 0;
ret = 1;
return ret;
}

/*------------------------------------------------------------------------*/
/* Request Grant to Access the Volume                                  */
/*------------------------------------------------------------------------*/
/* This function is called on entering file functions to lock the volume.
/  When a 0 is returned, the file function fails with FR_TIMEOUT.
*/

int ff_req_grant ( /* 1:Got a grant to access the volume, 0:Could not get a grant */
_SYNC_t sobj /* Sync object to wait */
)
{
int ret;

// ret = (int)(WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0); /* Win32 */

// ret = (int)(wai_sem(sobj) == E_OK);          /* uITRON */

// OSMutexPend(sobj, _FS_TIMEOUT, &err));       /* uC/OS-II */
// ret = (int)(err == OS_NO_ERR);

// ret = (int)(xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE); /* FreeRTOS */

OS_RESULT result = os_mut_wait(sobj,_FS_TIMEOUT);
if(result == OS_R_TMO)
{
      return 0;
}
else
{
      return 1;
}
}

/*------------------------------------------------------------------------*/
/* Release Grant to Access the Volume                                  */
/*------------------------------------------------------------------------*/
/* This function is called on leaving file functions to unlock the volume.
*/

void ff_rel_grant (
_SYNC_t sobj /* Sync object to be signaled */
)
{
// ReleaseMutex(sobj);       /* Win32 */

// sig_sem(sobj);          /* uITRON */

// OSMutexPost(sobj);       /* uC/OS-II */

// xSemaphoreGive(sobj); /* FreeRTOS */

os_mut_release(sobj);
}

#endif

#if _USE_LFN == 3 /* LFN with a working buffer on the heap */
/*------------------------------------------------------------------------*/
/* Allocate a memory block                                              */
/*------------------------------------------------------------------------*/
/* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
*/

void* ff_memalloc ( /* Returns pointer to the allocated memory block */
UINT msize       /* Number of bytes to allocate */
)
{
return malloc(msize); /* Allocate a new memory block with POSIX API */
}

/*------------------------------------------------------------------------*/
/* Free a memory block                                                 */
/*------------------------------------------------------------------------*/

void ff_memfree (
void* mblock /* Pointer to the memory block to free */
)
{
free(mblock); /* Discard the memory block with POSIX API */
}

#endif