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[paragraph] 在ucos下,使用fatfs文件系统,因为把文件系统有关的变量定义为全局变量,并且有多个任务需要调用fatfs文件系统的相关函数,
在网上比较了许多方法,有人使用关中断的方式,但是关中断造成的影响太严重了,还有使用调度锁的方法,比关中断好,但是
感觉用互斥信号量最合适,最终考虑使用互斥信号量,然后发现fatfs支持多任务操作系统的重入,借鉴安富莱综合例程,
下面是我的syscall.c源文件- /*------------------------------------------------------------------------*/
- /* Sample code of OS dependent controls for FatFs */
- /* (C)ChaN, 2012 */
- /*------------------------------------------------------------------------*/
- #include <stdlib.h> /* ANSI memory controls */
- //#include <malloc.h> /* ANSI memory controls */
- #include "ff.h"
- #if _FS_REENTRANT
- OS_MUTEX SD_FILE_MUTEX;
- /*------------------------------------------------------------------------*/
- /* Create a Synchronization Object
- /*------------------------------------------------------------------------*/
- /* This function is called by 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.
- */
- int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create due to any error */
- BYTE vol, /* Corresponding logical drive being processed */
- _SYNC_t* sobj /* Pointer to return the created sync object */
- )
- {
- int ret;
- OS_ERR err;
- OSMutexCreate((OS_MUTEX *)&SD_FILE_MUTEX, (CPU_CHAR *)"FatFSMutex",(OS_ERR *)&err);
-
- *sobj = SD_FILE_MUTEX;
-
- ret = (int)(err == OS_ERR_NONE);
- // *sobj = CreateMutex(NULL, FALSE, NULL); /* Win32 */
- // ret = (int)(*sobj != INVALID_HANDLE_VALUE);
- // *sobj = SyncObjects[vol]; /* uITRON (give a static created semaphore) */
- // ret = 1;
- // *sobj = OSMutexCreate(0, &err); /* uC/OS-II */
- // ret = (int)(err == OS_NO_ERR);
- // *sobj = xSemaphoreCreateMutex(); /* FreeRTOS */
- // ret = (int)(*sobj != NULL);
- 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;
- OS_ERR err;
-
- OSMutexDel ((OS_MUTEX *)&sobj,(OS_OPT )OS_OPT_DEL_ALWAYS, (OS_ERR *)&err);
-
- ret = (int)(err == OS_ERR_NONE);
- // 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);
- // xSemaphoreDelete(sobj); /* FreeRTOS */
- // ret = 1;
- return ret;
- }
- /*------------------------------------------------------------------------*/
- /* Request Grant to Access the Volume */
- /*------------------------------------------------------------------------*/
- /* This function is called on entering file functions to lock the volume.
- / When a FALSE is returned, the file function fails with FR_TIMEOUT.
- */
- int ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
- _SYNC_t sobj /* Sync object to wait */
- )
- {
- int ret;
- OS_ERR err;
-
- OSMutexPend ((OS_MUTEX *)&sobj,(OS_TICK )_FS_TIMEOUT,(OS_OPT )OS_OPT_PEND_BLOCKING,(CPU_TS )0,(OS_ERR *)&err);
-
- ret = (int)(err == OS_ERR_NONE);
- // 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 */
- return ret;
- }
- /*------------------------------------------------------------------------*/
- /* 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 */
- )
- {
- OS_ERR err;
- OSMutexPost ((OS_MUTEX *)&sobj,(OS_OPT )OS_OPT_POST_1,(OS_ERR *)&err);
- // ReleaseMutex(sobj); /* Win32 */
- // sig_sem(sobj); /* uITRON */
- // OSMutexPost(sobj); /* uC/OS-II */
- // xSemaphoreGive(sobj); /* FreeRTOS */
- }
- #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);
- }
- /*------------------------------------------------------------------------*/
- /* Free a memory block */
- /*------------------------------------------------------------------------*/
- void ff_memfree (
- void* mblock /* Pointer to the memory block to free */
- )
- {
- free(mblock);
- }
- #endif
复制代码 但是在单步调试的过程中,发现互斥信号量的创建,接受都没问题,但是ff_rel_grant发送信号量是,返回的err是OS_ERR_MUTEX_NOT_OWNER,
然后单步调试安富莱的综合例程,也发现了同样的问题。不知该如何处理,前来请教。 |
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