Diff: FileSystems/ff_rtos_helpers.cpp

Revision:

2:887c6b45e7fa

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FileSystems/ff_rtos_helpers.cpp	Tue Dec 02 15:21:18 2014 +0000
@@ -0,0 +1,197 @@
+/*
+ *  Copyright 2014 Embedded Artists AB
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/******************************************************************************
+ * Includes
+ *****************************************************************************/
+
+#include "ff.h"
+#include "mbed.h"
+#include "rtos.h"
+
+/******************************************************************************
+ * Defines and typedefs
+ *****************************************************************************/
+
+/******************************************************************************
+ * External global variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Local variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Global Functions
+ *****************************************************************************/
+
+#if _FS_REENTRANT
+/*------------------------------------------------------------------------*/
+/* Create a Synchronization Object                                        */
+/*------------------------------------------------------------------------*/
+/* This function is called in f_mount function to create a new
+/  synchronization object, such as semaphore and mutex. When a zero is
+/  returned, the f_mount function fails with FR_INT_ERR.
+*/
+
+int ff_cre_syncobj (	/* TRUE:Function succeeded, FALSE: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;
+
+//	*sobj = CreateMutex(NULL, FALSE, NULL);	/* Win32 */
+//	ret = (*sobj != INVALID_HANDLE_VALUE);
+
+//	*sobj = SyncObjects[vol];	/* uITRON (give a static sync object) */
+//	ret = 1;					/* The initial value of the semaphore must be 1. */
+
+//	*sobj = OSMutexCreate(0, &err);			/* uC/OS-II */
+//	ret = (err == OS_NO_ERR);
+
+//	*sobj = xSemaphoreCreateMutex();		/* FreeRTOS */
+//	ret = (*sobj != NULL);
+
+	*sobj = new Mutex();					/* MBED RTOS */
+//	*sobj = new Semaphore(1);				/* MBED RTOS */
+	ret = (*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 zero is
+/  returned, the f_mount function fails with FR_INT_ERR.
+*/
+
+int ff_del_syncobj (	/* TRUE:Function succeeded, FALSE:Could not delete due to any error */
+	_SYNC_t sobj		/* Sync object tied to the logical drive to be deleted */
+)
+{
+	BOOL ret;
+
+//	ret = CloseHandle(sobj);	/* Win32 */
+
+//	ret = 1;					/* uITRON (nothing to do) */
+
+//	OSMutexDel(sobj, OS_DEL_ALWAYS, &err);	/* uC/OS-II */
+//	ret = (err == OS_NO_ERR);
+
+//	ret = 1;					/* FreeRTOS (nothing to do) */
+
+	if (sobj != NULL) {			/* MBED RTOS */
+		free(sobj);
+	}
+	ret = 1;
+
+	return ret;
+}
+
+
+
+/*------------------------------------------------------------------------*/
+/* Request Grant to Access the Volume                                     */
+/*------------------------------------------------------------------------*/
+/* This function is called on entering file functions to lock the volume.
+/  When a zero 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;
+
+//	ret = (WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0);	/* Win32 */
+
+//	ret = (wai_sem(sobj) == E_OK);	/* uITRON */
+
+//	OSMutexPend(sobj, _FS_TIMEOUT, &err));			/* uC/OS-II */
+//	ret = (err == OS_NO_ERR);
+
+//	ret = (xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE);	/* FreeRTOS */
+
+	ret = ((*((Mutex*)sobj)).lock(_FS_TIMEOUT) == osOK);   /* MBED RTOS */
+//    static volatile osThreadId lastid = Thread::gettid();
+//	ret = ((*((Semaphore*)sobj)).wait(_FS_TIMEOUT) == 1);   /* MBED RTOS */
+
+	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 */
+)
+{
+//	ReleaseMutex(sobj);		/* Win32 */
+
+//	sig_sem(sobj);			/* uITRON */
+
+//	OSMutexPost(sobj);		/* uC/OS-II */
+
+//	xSemaphoreGive(sobj);	/* FreeRTOS */
+
+	(*((Mutex*)sobj)).unlock();			/* MBED RTOS */
+//	(*((Semaphore*)sobj)).release();	/* MBED RTOS */
+}
+
+#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 size		/* Number of bytes to allocate */
+)
+{
+	return malloc(size);
+}
+
+
+/*------------------------------------------------------------------------*/
+/* Free a memory block                                                    */
+/*------------------------------------------------------------------------*/
+
+void ff_memfree(
+	void* mblock	/* Pointer to the memory block to free */
+)
+{
+	free(mblock);
+}
+
+#endif
+
+