/*------------------------------------------------------------------------*/
/* Sample Code of OS Dependent Functions for FatFs                        */
/* (C)ChaN, 2017                                                          */
/*------------------------------------------------------------------------*/


#include "ff.h"
#include <FreeRTOS.h>
#include <task.h>
#include <semphr.h>
#include <stdlib.h>


#if FF_USE_LFN == 3	/* Dynamic memory allocation */

/*------------------------------------------------------------------------*/
/* Allocate a memory block                                                */
/*------------------------------------------------------------------------*/

void* ff_memalloc (	/* Returns pointer to the allocated memory block (null on not enough core) */
	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 (nothing to do for null) */
)
{
	free(mblock);	/* Free the memory block with POSIX API */
}

#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];	/* CMSIS-RTOS */


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 */
)
{
	/* FreeRTOS */
    *sobj = xSemaphoreCreateMutex();
    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 */
)
{
	/* FreeRTOS */
    vSemaphoreDelete(sobj);
    return 1;
}


/*------------------------------------------------------------------------*/
/* 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 */
)
{
    if (uxPortIsInISR())
    {
        BaseType_t xHigherPriorityTaskWoken = pdFALSE;
        int success = (int)xSemaphoreTakeFromISR(sobj, &xHigherPriorityTaskWoken);
        if (!success && FF_FS_TIMEOUT > 0)
        {
            vPortDebugBreak();
            abort(); /* Tried to block on mutex from ISR, couldn't... rewrite your program to avoid libc interactions in ISRs! */
        }
        if (xHigherPriorityTaskWoken)
            portYIELD_FROM_ISR();
        return success;
    }
    else
    {
        /* FreeRTOS */
        return (int)(xSemaphoreTake(sobj, FF_FS_TIMEOUT) == pdTRUE);
    }
}


/*------------------------------------------------------------------------*/
/* 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 */
)
{
    if (uxPortIsInISR())
    {
        BaseType_t xHigherPriorityTaskWoken = pdFALSE;
        xSemaphoreGiveFromISR(sobj, &xHigherPriorityTaskWoken);
        if (xHigherPriorityTaskWoken)
            portYIELD_FROM_ISR();
    }
    else
    {
        /* FreeRTOS */
        xSemaphoreGive(sobj);
    }
}

#endif

