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/*
* FreeRTOS+FAT build 191128 - Note: FreeRTOS+FAT is still in the lab!
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Authors include James Walmsley, Hein Tibosch and Richard Barry
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* https://www.FreeRTOS.org
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
#include "ff_headers.h"
#include "event_groups.h"
#ifndef configUSE_RECURSIVE_MUTEXES
#error configUSE_RECURSIVE_MUTEXES must be set to 1 in FreeRTOSConfig.h
#else
#if( configUSE_RECURSIVE_MUTEXES != 1 )
#error configUSE_RECURSIVE_MUTEXES must be set to 1 in FreeRTOSConfig.h
#endif
#endif /* configUSE_RECURSIVE_MUTEXES */
#if ( INCLUDE_vTaskDelay != 1 )
#error Missing some FreeRTOS define
#endif
/* There are two areas which are protected with a semaphore:
Directories and the FAT area.
The masks below are used when calling Group Event functions. */
#define FF_FAT_LOCK_EVENT_BITS ( ( const EventBits_t ) FF_FAT_LOCK )
#define FF_DIR_LOCK_EVENT_BITS ( ( const EventBits_t ) FF_DIR_LOCK )
/* This is not a real lock: it is a bit (or semaphore) will will be given
each time when a sector buffer is released. */
#define FF_BUF_LOCK_EVENT_BITS ( ( const EventBits_t ) FF_BUF_LOCK )
/*-----------------------------------------------------------*/
BaseType_t FF_TrySemaphore( void *pxSemaphore, uint32_t ulTime_ms )
{
BaseType_t xReturn;
configASSERT( pxSemaphore );
xReturn = xSemaphoreTakeRecursive( ( SemaphoreHandle_t ) pxSemaphore, pdMS_TO_TICKS( ulTime_ms ) );
return xReturn;
}
/*-----------------------------------------------------------*/
void FF_PendSemaphore( void *pxSemaphore )
{
configASSERT( pxSemaphore );
xSemaphoreTakeRecursive( ( SemaphoreHandle_t ) pxSemaphore, portMAX_DELAY );
}
/*-----------------------------------------------------------*/
void FF_ReleaseSemaphore( void *pxSemaphore )
{
configASSERT( pxSemaphore );
xSemaphoreGiveRecursive( ( SemaphoreHandle_t ) pxSemaphore );
}
/*-----------------------------------------------------------*/
void FF_Sleep( uint32_t ulTime_ms )
{
vTaskDelay( pdMS_TO_TICKS( ulTime_ms ) );
}
/*-----------------------------------------------------------*/
void FF_DeleteEvents( FF_IOManager_t *pxIOManager )
{
if( pxIOManager->xEventGroup != NULL )
{
vEventGroupDelete( pxIOManager->xEventGroup );
}
}
/*-----------------------------------------------------------*/
BaseType_t FF_CreateEvents( FF_IOManager_t *pxIOManager )
{
BaseType_t xResult;
pxIOManager->xEventGroup = xEventGroupCreate();
if( pxIOManager->xEventGroup != NULL )
{
xEventGroupSetBits( pxIOManager->xEventGroup,
FF_FAT_LOCK_EVENT_BITS | FF_DIR_LOCK_EVENT_BITS | FF_BUF_LOCK_EVENT_BITS );
xResult = pdTRUE;
}
else
{
xResult = pdFALSE;
}
return xResult;
}
/*-----------------------------------------------------------*/
void FF_LockDirectory( FF_IOManager_t *pxIOManager )
{
EventBits_t xBits;
for( ;; )
{
/* Called when a task want to make changes to a directory.
First it waits for the desired bit to come high. */
xEventGroupWaitBits( pxIOManager->xEventGroup,
FF_DIR_LOCK_EVENT_BITS, /* uxBitsToWaitFor */
( EventBits_t )0, /* xClearOnExit */
pdFALSE, /* xWaitForAllBits n.a. */
pdMS_TO_TICKS( 10000UL ) );
/* The next operation will only succeed for 1 task at a time,
because it is an atomary test & set operation: */
xBits = xEventGroupClearBits( pxIOManager->xEventGroup, FF_DIR_LOCK_EVENT_BITS );
if( ( xBits & FF_DIR_LOCK_EVENT_BITS ) != 0 )
{
/* This task has cleared the desired bit.
It now 'owns' the resource. */
break;
}
}
}
/*-----------------------------------------------------------*/
void FF_UnlockDirectory( FF_IOManager_t *pxIOManager )
{
configASSERT( ( xEventGroupGetBits( pxIOManager->xEventGroup ) & FF_DIR_LOCK_EVENT_BITS ) == 0 );
xEventGroupSetBits( pxIOManager->xEventGroup, FF_DIR_LOCK_EVENT_BITS );
}
/*-----------------------------------------------------------*/
int FF_Has_Lock( FF_IOManager_t *pxIOManager, uint32_t aBits )
{
int iReturn;
void *handle = xTaskGetCurrentTaskHandle();
if( ( aBits & FF_FAT_LOCK_EVENT_BITS ) != 0 )
{
if( ( pxIOManager->pvFATLockHandle != NULL ) && ( pxIOManager->pvFATLockHandle == handle ) )
{
iReturn = pdTRUE;
}
else
{
iReturn = pdFALSE;
}
}
else
{
iReturn = pdFALSE;
}
return iReturn;
}
void FF_Assert_Lock( FF_IOManager_t *pxIOManager, uint32_t aBits )
{
void *handle = xTaskGetCurrentTaskHandle();
if( ( aBits & FF_FAT_LOCK_EVENT_BITS ) != 0 )
{
configASSERT( ( pxIOManager->pvFATLockHandle != NULL ) && ( pxIOManager->pvFATLockHandle == handle ) );
/* In case configASSERT() is not defined. */
( void ) pxIOManager;
( void ) handle;
}
}
void FF_LockFAT( FF_IOManager_t *pxIOManager )
{
EventBits_t xBits;
configASSERT( FF_Has_Lock( pxIOManager, FF_FAT_LOCK ) == pdFALSE );
for( ;; )
{
/* Called when a task want to make changes to the FAT area.
First it waits for the desired bit to come high. */
xEventGroupWaitBits( pxIOManager->xEventGroup,
FF_FAT_LOCK_EVENT_BITS, /* uxBitsToWaitFor */
( EventBits_t )0, /* xClearOnExit */
pdFALSE, /* xWaitForAllBits n.a. */
pdMS_TO_TICKS( 10000UL ) );
/* The next operation will only succeed for 1 task at a time,
because it is an atomary test & set operation: */
xBits = xEventGroupClearBits( pxIOManager->xEventGroup, FF_FAT_LOCK_EVENT_BITS );
if( ( xBits & FF_FAT_LOCK_EVENT_BITS ) != 0 )
{
/* This task has cleared the desired bit.
It now 'owns' the resource. */
pxIOManager->pvFATLockHandle = xTaskGetCurrentTaskHandle();
break;
}
}
}
/*-----------------------------------------------------------*/
void FF_UnlockFAT( FF_IOManager_t *pxIOManager )
{
configASSERT( ( xEventGroupGetBits( pxIOManager->xEventGroup ) & FF_FAT_LOCK_EVENT_BITS ) == 0 );
pxIOManager->pvFATLockHandle = NULL;
xEventGroupSetBits( pxIOManager->xEventGroup, FF_FAT_LOCK_EVENT_BITS );
}
/*-----------------------------------------------------------*/
BaseType_t FF_BufferWait( FF_IOManager_t *pxIOManager, uint32_t xWaitMS )
{
EventBits_t xBits;
BaseType_t xReturn;
/* This function is called when a task is waiting for a sector buffer
to become available. */
xBits = xEventGroupWaitBits( pxIOManager->xEventGroup,
FF_BUF_LOCK_EVENT_BITS, /* uxBitsToWaitFor */
FF_BUF_LOCK_EVENT_BITS, /* xClearOnExit */
pdFALSE, /* xWaitForAllBits n.a. */
pdMS_TO_TICKS( xWaitMS ) );
if( ( xBits & FF_BUF_LOCK_EVENT_BITS ) != 0 )
{
xReturn = pdTRUE;
}
else
{
xReturn = pdFALSE;
}
return xReturn;
}
/*-----------------------------------------------------------*/
void FF_BufferProceed( FF_IOManager_t *pxIOManager )
{
/* Wake-up all tasks that are waiting for a sector buffer to become available. */
xEventGroupSetBits( pxIOManager->xEventGroup, FF_BUF_LOCK_EVENT_BITS );
}
/*-----------------------------------------------------------*/
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