Diff: FileSystems/RAMFileSystem.cpp

Revision:

0:6b68dac0d986

Child:

9:a33326afd686

diff -r 000000000000 -r 6b68dac0d986 FileSystems/RAMFileSystem.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FileSystems/RAMFileSystem.cpp	Fri Nov 21 11:42:51 2014 +0000
@@ -0,0 +1,56 @@
+#include "RAMFileSystem.h"
+#include "mbed_debug.h"
+
+#define RAMFS_DBG       0
+
+#define SECTOR_SIZE   512
+
+RAMFileSystem::RAMFileSystem(uint32_t addr, uint32_t size, const char* name) :
+    FATFileSystem(name) {
+    memStart = addr;
+    memSize = size - (size % SECTOR_SIZE);
+    status = 1; //1: disk not initialized
+}
+
+int RAMFileSystem::disk_initialize() {
+    debug_if(RAMFS_DBG, "init RAM fs\n");
+    status = 0; //OK
+    return status;
+}
+
+int RAMFileSystem::disk_write(const uint8_t *buffer, uint64_t sector, uint8_t count) {
+    debug_if(RAMFS_DBG, "write to sector(s) %llu..%llu\n", sector, sector+count);
+    if ((sector+count-1) >= disk_sectors()) {
+        return 1;
+    }
+    
+    memcpy((uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), buffer, SECTOR_SIZE*count);
+    return 0;
+}
+
+int RAMFileSystem::disk_read(uint8_t *buffer, uint64_t sector, uint8_t count) {
+    debug_if(RAMFS_DBG, "read from sector(s) %llu..%llu\n", sector, sector+count);
+    if ((sector+count-1) >= disk_sectors()) {
+        return 1;
+    }
+    
+    memcpy(buffer, (uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), SECTOR_SIZE*count);
+    return 0;
+}
+
+int RAMFileSystem::disk_status() { 
+    debug_if(RAMFS_DBG, "disk status %d\n", status);
+    return status; 
+}
+int RAMFileSystem::disk_sync() { 
+    return 0; 
+}
+uint64_t RAMFileSystem::disk_sectors() { 
+    debug_if(RAMFS_DBG, "returning fs has %u sectors\n", memSize/SECTOR_SIZE);
+    return memSize/SECTOR_SIZE; 
+}
+
+uint64_t RAMFileSystem::disk_size() {
+    return memSize;
+}
+