SAMV71 Xplained Ultra Software Package 1.0

syscall.c

00001 /*------------------------------------------------------------------------*/
00002 /* Sample code of OS dependent controls for FatFs R0.08                   */
00003 /* (C)ChaN, 2010                                                          */
00004 /*------------------------------------------------------------------------*/
00005 
00006 #include <stdlib.h>        /* ANSI memory controls */
00007 #include <malloc.h>        /* ANSI memory controls */
00008 
00009 #include "../ff.h"
00010 
00011 
00012 #if _FS_REENTRANT
00013 /*------------------------------------------------------------------------*/
00014 /* Create a Synchronization Object
00015 /*------------------------------------------------------------------------*/
00016 /* This function is called in f_mount function to create a new
00017 /  synchronization object, such as semaphore and mutex. When a FALSE is
00018 /  returned, the f_mount function fails with FR_INT_ERR.
00019 */
00020 
00021 BOOL ff_cre_syncobj (    /* TRUE:Function succeeded, FALSE:Could not create due to any error */
00022     BYTE vol,            /* Corresponding logical drive being processed */
00023     _SYNC_t *sobj        /* Pointer to return the created sync object */
00024 )
00025 {
00026     BOOL ret;
00027 
00028     *sobj = CreateMutex(NULL, FALSE, NULL);                    /* Win32 */
00029     ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE;
00030 
00031 //    *sobj = SyncObjects[vol];    /* uITRON (give a static created sync object) */
00032 //    ret = TRUE;                    /* The initial value of the semaphore must be 1. */
00033 
00034 //    *sobj = OSMutexCreate(0, &err);                /* uC/OS-II */
00035 //    ret = (err == OS_NO_ERR) ? TRUE : FALSE;
00036 
00037 //    *sobj = xSemaphoreCreateMutex();            /* FreeRTOS */
00038 //    ret = (*sobj != NULL) ? TRUE : FALSE;
00039 
00040     return ret;
00041 }
00042 
00043 
00044 
00045 /*------------------------------------------------------------------------*/
00046 /* Delete a Synchronization Object                                        */
00047 /*------------------------------------------------------------------------*/
00048 /* This function is called in f_mount function to delete a synchronization
00049 /  object that created with ff_cre_syncobj function. When a FALSE is
00050 /  returned, the f_mount function fails with FR_INT_ERR.
00051 */
00052 
00053 BOOL ff_del_syncobj (    /* TRUE:Function succeeded, FALSE:Could not delete due to any error */
00054     _SYNC_t sobj        /* Sync object tied to the logical drive to be deleted */
00055 )
00056 {
00057     BOOL ret;
00058 
00059     ret = CloseHandle(sobj);    /* Win32 *
00060 
00061 //    ret = TRUE;                    /* uITRON (nothing to do) *
00062 
00063 //    OSMutexDel(sobj, OS_DEL_ALWAYS, &err);        /* uC/OS-II */
00064 //    ret = (err == OS_NO_ERR) ? TRUE : FALSE;
00065 
00066 //    ret = TRUE;                    /* FreeRTOS (nothing to do) */
00067 
00068     return ret;
00069 }
00070 
00071 
00072 
00073 /*------------------------------------------------------------------------*/
00074 /* Request Grant to Access the Volume                                     */
00075 /*------------------------------------------------------------------------*/
00076 /* This function is called on entering file functions to lock the volume.
00077 /  When a FALSE is returned, the file function fails with FR_TIMEOUT.
00078 */
00079 
00080 BOOL ff_req_grant (    /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
00081     _SYNC_t sobj    /* Sync object to wait */
00082 )
00083 {
00084     BOOL ret;
00085 
00086     ret = (WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE;    /* Win32 */
00087 
00088 //    ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE;    /* uITRON */
00089 
00090 //    OSMutexPend(sobj, _FS_TIMEOUT, &err));            /* uC/OS-II */
00091 //    ret = (err == OS_NO_ERR) ? TRUE : FALSE;
00092 
00093 //    ret = (xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE) ? TRUE : FALSE;    /* FreeRTOS */
00094 
00095     return ret;
00096 }
00097 
00098 
00099 
00100 /*------------------------------------------------------------------------*/
00101 /* Release Grant to Access the Volume                                     */
00102 /*------------------------------------------------------------------------*/
00103 /* This function is called on leaving file functions to unlock the volume.
00104 */
00105 
00106 void ff_rel_grant (
00107     _SYNC_t sobj    /* Sync object to be signalled */
00108 )
00109 {
00110     ReleaseMutex(sobj);        /* Win32 */
00111 
00112 //    sig_sem(sobj);            /* uITRON */
00113 
00114 //    OSMutexPost(sobj);        /* uC/OS-II */
00115 
00116 //    xSemaphoreGive(sobj);    /* FreeRTOS */
00117 
00118 }
00119 
00120 #endif
00121 
00122 
00123 
00124 
00125 #if _USE_LFN == 3    /* LFN with a working buffer on the heap */
00126 /*------------------------------------------------------------------------*/
00127 /* Allocate a memory block                                                */
00128 /*------------------------------------------------------------------------*/
00129 /* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
00130 */
00131 
00132 void* ff_memalloc (    /* Returns pointer to the allocated memory block */
00133     UINT size        /* Number of bytes to allocate */
00134 )
00135 {
00136     return malloc(size);
00137 }
00138 
00139 
00140 /*------------------------------------------------------------------------*/
00141 /* Free a memory block                                                    */
00142 /*------------------------------------------------------------------------*/
00143 
00144 void ff_memfree(
00145     void* mblock    /* Pointer to the memory block to free */
00146 )
00147 {
00148     free(mblock);
00149 }
00150 
00151 #endif
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines