diff options
Diffstat (limited to 'FreeRTOS-Labs/Source/FreeRTOS-Plus-FAT/ff_dev_support.c')
| -rw-r--r-- | FreeRTOS-Labs/Source/FreeRTOS-Plus-FAT/ff_dev_support.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/FreeRTOS-Labs/Source/FreeRTOS-Plus-FAT/ff_dev_support.c b/FreeRTOS-Labs/Source/FreeRTOS-Plus-FAT/ff_dev_support.c new file mode 100644 index 000000000..4aee325f5 --- /dev/null +++ b/FreeRTOS-Labs/Source/FreeRTOS-Plus-FAT/ff_dev_support.c @@ -0,0 +1,235 @@ +/*
+ * 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 <string.h>
+
+/* FreeRTOS includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "portable.h"
+
+#include "ff_headers.h"
+#include "ff_devices.h"
+
+#ifndef ARRAY_SIZE
+# define ARRAY_SIZE( x ) ( int )( sizeof( x ) / sizeof( x )[ 0 ] )
+#endif
+
+#if( ffconfigDEV_SUPPORT == 0 )
+ #error No use to include this module if ffconfigDEV_SUPPORT is disabled
+#endif /* ffconfigDEV_SUPPORT == 0 */
+
+struct SFileCache
+{
+ char pcFileName[16];
+ uint32_t ulFileLength;
+ uint32_t ulFilePointer;
+};
+
+struct SFileCache xFiles[ 16 ];
+
+enum eCACHE_ACTION
+{
+ eCACHE_LOOKUP,
+ eCACHE_ADD,
+ eCACHE_REMOVE,
+};
+
+const char pcDevicePath[] = ffconfigDEV_PATH;
+
+struct SFileCache *pxFindFile( const char *pcFname, enum eCACHE_ACTION eAction )
+{
+BaseType_t xIndex, xFreeIndex = -1;
+struct SFileCache *pxResult = NULL;
+
+ for( xIndex = 0; xIndex < ARRAY_SIZE( xFiles ); xIndex++ )
+ {
+ if( xFiles[ xIndex ].pcFileName[ 0 ] == '\0' )
+ {
+ if( xFreeIndex < 0 )
+ {
+ xFreeIndex = xIndex;
+ }
+ }
+ else if( strcmp( xFiles[ xIndex ].pcFileName, pcFname ) == 0 )
+ {
+ if( eAction == eCACHE_REMOVE )
+ {
+ xFiles[ xIndex ].pcFileName[ 0 ] = '\0';
+ }
+
+ pxResult = xFiles + xIndex;
+ break;
+ }
+ }
+
+ if( ( pxResult == NULL ) && ( eAction == eCACHE_ADD ) && ( xFreeIndex >= 0 ) )
+ {
+ pxResult = xFiles + xFreeIndex;
+ snprintf( pxResult->pcFileName, sizeof( pxResult->pcFileName ), "%s", pcFname );
+ pxResult->ulFileLength = 0;
+ pxResult->ulFilePointer = 0;
+ }
+
+ return pxResult;
+}
+
+BaseType_t xCheckDevicePath( const char *pcPath )
+{
+BaseType_t xDevLength;
+BaseType_t xPathLength;
+BaseType_t xIsDevice;
+
+ xDevLength = sizeof( pcDevicePath ) - 1;
+ xPathLength = strlen( pcPath );
+
+ /* System "/dev" should not match with "/device/etc". */
+ if( ( xPathLength >= xDevLength ) &&
+ ( memcmp( pcDevicePath, pcPath, xDevLength ) == 0 ) &&
+ ( ( pcPath[ xDevLength ] == '\0' ) || ( pcPath[ xDevLength ] == '/' ) ) )
+ {
+ xIsDevice = FF_DEV_CHAR_DEV;
+ }
+ else
+ {
+ xIsDevice = FF_DEV_NO_DEV;
+ }
+
+ return xIsDevice;
+}
+
+BaseType_t FF_Device_Open( const char *pcPath, FF_FILE *pxStream )
+{
+uint8_t ucIsDevice;
+
+ ucIsDevice = xCheckDevicePath( pcPath );
+ if( ucIsDevice != pdFALSE )
+ {
+ const char *pcBaseName = pcPath;
+
+ if( memcmp( pcBaseName, pcDevicePath, sizeof( pcDevicePath ) - 1 ) == 0 )
+ {
+ pcBaseName = pcBaseName + sizeof( pcDevicePath );
+ }
+
+ pxStream->pxDevNode = pxFindFile( pcBaseName, eCACHE_ADD );
+ if( pxStream->pxDevNode != NULL )
+ {
+ pxStream->pxDevNode->ulFilePointer = 0;
+ if( ( pxStream->ucMode & ( FF_MODE_WRITE | FF_MODE_APPEND | FF_MODE_CREATE ) ) == 0 )
+ {
+ pxStream->ulFileSize = pxStream->pxDevNode->ulFileLength;
+ }
+ }
+ }
+
+ return ucIsDevice;
+}
+
+void FF_Device_Close( FF_FILE * pxStream )
+{
+ if( pxStream->pxDevNode != NULL )
+ {
+ pxStream->ulFileSize = 0ul;
+ pxStream->ulFilePointer = 0ul;
+ }
+}
+
+size_t FF_Device_Read( void *pvBuf, size_t lSize, size_t lCount, FF_FILE * pxStream )
+{
+ lCount *= lSize;
+ return lCount;
+}
+
+size_t FF_Device_Write( const void *pvBuf, size_t lSize, size_t lCount, FF_FILE * pxStream )
+{
+ lCount *= lSize;
+
+ if( pxStream->pxDevNode != NULL )
+ {
+
+ pxStream->pxDevNode->ulFilePointer += lCount;
+ if( pxStream->pxDevNode->ulFileLength < pxStream->pxDevNode->ulFilePointer )
+ {
+ pxStream->pxDevNode->ulFileLength = pxStream->pxDevNode->ulFilePointer;
+ }
+ }
+ return lCount;
+}
+
+int FF_Device_Seek( FF_FILE *pxStream, long lOffset, int iWhence )
+{
+ if( pxStream->pxDevNode != NULL )
+ {
+ if( iWhence == FF_SEEK_SET )
+ {
+ pxStream->pxDevNode->ulFilePointer = lOffset;
+ }
+ else if( iWhence == FF_SEEK_END )
+ {
+ pxStream->pxDevNode->ulFilePointer = pxStream->pxDevNode->ulFileLength - lOffset;
+ }
+ }
+
+ return 0;
+}
+
+int FF_Device_GetDirEnt( const char *pcPath, FF_DirEnt_t *pxDirEnt )
+{
+BaseType_t xIsDotDir = 0;
+ if( pxDirEnt->pcFileName[ 0 ] == '.' )
+ {
+ if( ( pxDirEnt->pcFileName[ 1 ] == '.' ) &&
+ ( pxDirEnt->pcFileName[ 2 ] == '\0' ) )
+ {
+ xIsDotDir = 2;
+ }
+ else if( pxDirEnt->pcFileName[ 1 ] == '\0' )
+ {
+ xIsDotDir = 1;
+ }
+ }
+ if( xIsDotDir == 0 )
+ {
+ struct SFileCache *pxDevNode;
+
+ pxDevNode = pxFindFile( pxDirEnt->pcFileName, eCACHE_LOOKUP );
+
+ pxDirEnt->ucIsDeviceDir = FF_DEV_CHAR_DEV;
+ if( pxDevNode != NULL )
+ {
+ pxDirEnt->ulFileSize = pxDevNode->ulFileLength;
+ }
+ else if( pxDirEnt->ulFileSize < 2048 )
+ {
+ pxDirEnt->ulFileSize = 2048;
+ }
+ }
+
+ return 1024;
+}
+
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