RAMFileSystem.cpp

00001 #include "RAMFileSystem.h"
00002 #include "mbed_debug.h"
00003 
00004 #define RAMFS_DBG       0
00005 
00006 #define SECTOR_SIZE   512
00007 
00008 RAMFileSystem::RAMFileSystem(uint32_t addr, uint32_t size, const char* name) :
00009     FATFileSystem(name) {
00010     memStart = addr;
00011     memSize = size - (size % SECTOR_SIZE);
00012     status = 1; //1: disk not initialized
00013 }
00014 
00015 int RAMFileSystem::disk_initialize() {
00016     debug_if(RAMFS_DBG, "init RAM fs\n");
00017     status = 0; //OK
00018     return status;
00019 }
00020 
00021 int RAMFileSystem::disk_write(const uint8_t *buffer, uint64_t sector) {
00022     debug_if(RAMFS_DBG, "write to sector %llu\n", sector);
00023     if (sector >= disk_sectors()) {
00024         return 1;
00025     }
00026     
00027     memcpy((uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), buffer, SECTOR_SIZE);
00028     return 0;
00029 }
00030 
00031 int RAMFileSystem::disk_read(uint8_t *buffer, uint64_t sector) {
00032     debug_if(RAMFS_DBG, "read from sector %llu\n", sector);
00033     if (sector >= disk_sectors()) {
00034         return 1;
00035     }
00036     
00037     memcpy(buffer, (uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), SECTOR_SIZE);
00038     return 0;
00039 }
00040 
00041 int RAMFileSystem::disk_nwrite(const uint8_t *buffer, uint64_t sector, uint8_t count) {
00042     debug_if(RAMFS_DBG, "write to sector(s) %llu..%llu\n", sector, sector+count);
00043     if ((sector+count-1) >= disk_sectors()) {
00044         return 1;
00045     }
00046     
00047     memcpy((uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), buffer, SECTOR_SIZE*count);
00048     return 0;
00049 }
00050 
00051 int RAMFileSystem::disk_nread(uint8_t *buffer, uint64_t sector, uint8_t count) {
00052     debug_if(RAMFS_DBG, "read from sector(s) %llu..%llu\n", sector, sector+count);
00053     if ((sector+count-1) >= disk_sectors()) {
00054         return 1;
00055     }
00056     
00057     memcpy(buffer, (uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), SECTOR_SIZE*count);
00058     return 0;
00059 }
00060 
00061 int RAMFileSystem::disk_status() { 
00062     debug_if(RAMFS_DBG, "disk status %d\n", status);
00063     return status; 
00064 }
00065 int RAMFileSystem::disk_sync() { 
00066     return 0; 
00067 }
00068 uint64_t RAMFileSystem::disk_sectors() { 
00069     debug_if(RAMFS_DBG, "returning fs has %u sectors\n", memSize/SECTOR_SIZE);
00070     return memSize/SECTOR_SIZE; 
00071 }
00072 
00073 uint64_t RAMFileSystem::disk_size() {
00074     return memSize;
00075 }
00076