text: /*------------------------------------------------------------------------*/
  /* Sample Code of OS Dependent Functions for FatFs                        */
  /* (C)ChaN, 2018                                                          */
  /*------------------------------------------------------------------------*/
  
  #include <stdint.h>
  #include <stddef.h>
  #include <stdlib.h>
  
  #ifdef ENABLE_OS
  #include "os_hal_inc.h"
  #endif
  #include "ff.h"
  
  
  #if FF_USE_LFN == 3	/* Dynamic memory allocation */
  
  /*------------------------------------------------------------------------*/
  /* Allocate a memory block                                                */
  /*------------------------------------------------------------------------*/
  
  void* ff_memalloc (	/* Returns pointer to the allocated memory block (null if not enough core) */
  	UINT msize		/* Number of bytes to allocate */
  )
  {
  
  #ifdef OS_FREERTOS   /* FREERTOS */
  	return pvPortMalloc(msize);
  #else
  	return malloc(msize);	/* Allocate a new memory block with POSIX API */
  #endif
  
  }
  
  
  /*------------------------------------------------------------------------*/
  /* Free a memory block                                                    */
  /*------------------------------------------------------------------------*/
  
  void ff_memfree (
  	void* mblock	/* Pointer to the memory block to free (nothing to do if null) */
  )
  {
  
  #ifdef OS_FREERTOS	/* FREERTOS */
  	vPortFree(mblock);
  #else
  	free(mblock);	/* Discard the memory block with POSIX API */
  #endif
  
  }
  
  #endif
  
  
  
  #if FF_FS_REENTRANT	/* Mutal exclusion */
  
  /*------------------------------------------------------------------------*/
  /* Create a Synchronization Object                                        */
  /*------------------------------------------------------------------------*/
  /* This function is called in f_mount() function to create a new
  /  synchronization object for the volume, such as semaphore and mutex.
  /  When a 0 is returned, the f_mount() function fails with FR_INT_ERR.
  */
  
  //const osMutexDef_t Mutex[FF_VOLUMES];	/* Table of CMSIS-RTOS mutex */
  
  
  int ff_cre_syncobj (	/* 1:Function succeeded, 0:Could not create the sync object */
  	BYTE vol,			/* Corresponding volume (logical drive number) */
  	FF_SYNC_t* sobj		/* Pointer to return the created sync object */
  )
  {
  	/* Win32 */
  //	*sobj = CreateMutex(NULL, FALSE, NULL);
  //	return (int)(*sobj != INVALID_HANDLE_VALUE);
  
  	/* uITRON */
  //	T_CSEM csem = {TA_TPRI,1,1};
  //	*sobj = acre_sem(&csem);
  //	return (int)(*sobj > 0);
  
  	/* uC/OS-II */
  //	OS_ERR err;
  //	*sobj = OSMutexCreate(0, &err);
  //	return (int)(err == OS_NO_ERR);
  
  	/* FreeRTOS */
  #ifdef OS_FREERTOS   /* FREERTOS */
  	*sobj = xSemaphoreCreateMutex();
  	return (int)(*sobj != NULL);
  #else
  	return 1;
  #endif
  
  	/* CMSIS-RTOS */
  //	*sobj = osMutexCreate(&Mutex[vol]);
  //	return (int)(*sobj != NULL);
  }
  
  
  /*------------------------------------------------------------------------*/
  /* 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 an error */
  	FF_SYNC_t sobj		/* Sync object tied to the logical drive to be deleted */
  )
  {
  	/* Win32 */
  //	return (int)CloseHandle(sobj);
  
  	/* uITRON */
  //	return (int)(del_sem(sobj) == E_OK);
  
  	/* uC/OS-II */
  //	OS_ERR err;
  //	OSMutexDel(sobj, OS_DEL_ALWAYS, &err);
  //	return (int)(err == OS_NO_ERR);
  
  	/* FreeRTOS */
  #ifdef OS_FREERTOS   /* FREERTOS */
  	vSemaphoreDelete(sobj);
  #endif
  	return 1;
  
  	/* CMSIS-RTOS */
  //	return (int)(osMutexDelete(sobj) == osOK);
  }
  
  
  /*------------------------------------------------------------------------*/
  /* 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 */
  	FF_SYNC_t sobj	/* Sync object to wait */
  )
  {
  	/* Win32 */
  //	return (int)(WaitForSingleObject(sobj, FF_FS_TIMEOUT) == WAIT_OBJECT_0);
  
  	/* uITRON */
  //	return (int)(wai_sem(sobj) == E_OK);
  
  	/* uC/OS-II */
  //	OS_ERR err;
  //	OSMutexPend(sobj, FF_FS_TIMEOUT, &err));
  //	return (int)(err == OS_NO_ERR);
  
  	/* FreeRTOS */
  #ifdef OS_FREERTOS   /* FREERTOS */
  	return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);	/* FreeRTOS */
  #else
  	return 1;
  #endif
  
  	/* CMSIS-RTOS */
  //	return (int)(osMutexWait(sobj, FF_FS_TIMEOUT) == osOK);
  }
  
  
  /*------------------------------------------------------------------------*/
  /* Release Grant to Access the Volume                                     */
  /*------------------------------------------------------------------------*/
  /* This function is called on leaving file functions to unlock the volume.
  */
  
  void ff_rel_grant (
  	FF_SYNC_t sobj	/* Sync object to be signaled */
  )
  {
  	/* Win32 */
  //	ReleaseMutex(sobj);
  
  	/* uITRON */
  //	sig_sem(sobj);
  
  	/* uC/OS-II */
  //	OSMutexPost(sobj);
  
  	/* FreeRTOS */
  #ifdef OS_FREERTOS   /* FREERTOS */
  	xSemaphoreGive(sobj);
  #endif
  	/* CMSIS-RTOS */
  //	osMutexRelease(sobj);
  }
  
  #endif
  
  