149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*------------------------------------------------------------------------*/
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/* Sample code of OS dependent controls for FatFs */
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/* (C)ChaN, 2012 */
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/*------------------------------------------------------------------------*/
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#include <stdlib.h> /* ANSI process controls */
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#include <stdio.h>
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#include "ff.h"
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#include "csi_kernel.h"
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#include "osal/string.h"
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//#include "osal/osal_sema.h"
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//#include "osal/osal_alloc.h"
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#if FF_FS_REENTRANT
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/*------------------------------------------------------------------------*/
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/* Create a Synchronization Object */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount() function to create a new
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synchronization object, such as semaphore and mutex. When a 0 is returned,
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the f_mount() function fails with FR_INT_ERR.
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*/
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int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create due to any error */
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BYTE vol, /* Corresponding logical drive being processed */
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FF_SYNC_t *sobj /* Pointer to return the created sync object */
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)
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{
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int ret = 1;
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static os_mutex_t *sem[FF_VOLUMES]; /* FreeRTOS */
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//只会申请一次,不考虑会失败
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if(!sem[vol])
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{
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sem[vol] = os_zalloc(sizeof(os_mutex_t));
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int mutex_ret = os_mutex_init(sem[vol]);
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if(mutex_ret)
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{
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ret = 0;
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os_free(sem[vol]);
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sem[vol] = NULL;
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}
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else
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{
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*sobj = sem[vol];
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}
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}
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Delete a Synchronization Object */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount() function to delete a synchronization
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/ object that created with ff_cre_syncobj function. When a 0 is returned,
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/ the f_mount() function fails with FR_INT_ERR.
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*/
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int ff_del_syncobj ( /* 1:Function succeeded, 0:Could not delete due to any error */
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FF_SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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)
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{
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int ret = 1;
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//不移除信号量
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Request Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on entering file functions to lock the volume.
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/ When a 0 is returned, the file function fails with FR_TIMEOUT.
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*/
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int ff_req_grant ( /* 1:Got a grant to access the volume, 0:Could not get a grant */
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FF_SYNC_t sobj /* Sync object to wait */
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)
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{
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int ret;
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ret = os_mutex_lock(sobj,FF_FS_TIMEOUT);
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if(!ret)
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{
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ret = 1;
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}
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else
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{
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ret = 0;
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}
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Release Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on leaving file functions to unlock the volume.
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*/
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void ff_rel_grant (
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FF_SYNC_t sobj /* Sync object to be signaled */
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)
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{
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os_mutex_unlock(sobj);
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}
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#endif
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#if FF_USE_LFN == 3 /* LFN with a working buffer on the heap */
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/*------------------------------------------------------------------------*/
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/* Allocate a memory block */
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/*------------------------------------------------------------------------*/
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/* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
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*/
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void* ff_memalloc ( /* Returns pointer to the allocated memory block */
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UINT msize /* Number of bytes to allocate */
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)
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{
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//_os_printf("msize:%d\r\n",msize);
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return os_malloc_psram(msize); /* Allocate a memory block with POSIX API */
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}
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/*------------------------------------------------------------------------*/
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/* Free a memory block */
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/*------------------------------------------------------------------------*/
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void ff_memfree (
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void* mblock /* Pointer to the memory block to free */
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)
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{
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os_free_psram(mblock);
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}
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#endif
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