RAMFileSystem.h

00001 /*
00002  *  Copyright 2014 Embedded Artists AB
00003  *
00004  *  Licensed under the Apache License, Version 2.0 (the "License");
00005  *  you may not use this file except in compliance with the License.
00006  *  You may obtain a copy of the License at
00007  *
00008  *    http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  *  Unless required by applicable law or agreed to in writing, software
00011  *  distributed under the License is distributed on an "AS IS" BASIS,
00012  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *  See the License for the specific language governing permissions and
00014  *  limitations under the License.
00015  */
00016 
00017 #ifndef RAMFILESYSTEM_H
00018 #define RAMFILESYSTEM_H
00019 
00020 #include "mbed.h"
00021 #include "FATFileSystem.h"
00022 #include "sdram.h"
00023 #include <stdint.h>
00024 
00025 /** Creates a FAT file system in SDRAM
00026  *
00027  * @code
00028  * #include "mbed.h"
00029  * #include "RAMFileSystem.h"
00030  *
00031  * RAMFileSystem ramfs(0xA0000000, 4*1024*1024, "ram"); // 4MB of ram starting at 0xA...
00032  *  
00033  * int main() {
00034  *     sdram_init();
00035  *
00036  *     FILE *fp = fopen("/ram/myfile.txt", "w");
00037  *     fprintf(fp, "Hello World!\n");
00038  *     fclose(fp);
00039  * }
00040  * @endcode
00041  */
00042 class RAMFileSystem : public FATFileSystem {
00043 public:
00044 
00045     /** Create the File System in RAM
00046      *
00047      * @param addr Start of memory to use for file system
00048      * @param size Number of bytes to use for file system
00049      * @param name The name used to access the virtual filesystem
00050      */
00051     RAMFileSystem(uint32_t addr, uint32_t size, const char* name);
00052     virtual int disk_initialize();
00053     virtual int disk_status();
00054     virtual int disk_read(uint8_t * buffer, uint64_t sector, uint8_t count);
00055     virtual int disk_write(const uint8_t * buffer, uint64_t sector, uint8_t count);
00056     virtual int disk_sync();
00057     virtual uint64_t disk_sectors();
00058 
00059     uint64_t disk_size();
00060 
00061 protected:
00062 
00063     uint32_t memStart;
00064     uint32_t memSize;
00065     int status;
00066 };
00067 
00068 #endif