Diff: FATFileSystem.cpp

Revision:

0:93acdd9f65f4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FATFileSystem.cpp	Fri Mar 30 18:41:26 2012 +0000
@@ -0,0 +1,176 @@
+/* mbed Microcontroller Library - FATFileSystem
+ * Copyright (c) 2008, sford
+ */
+
+#include "FATFileSystem.h"
+
+#include "mbed.h"
+
+#include "FileSystemLike.h"
+#include "FATFileHandle.h"
+#include "FATDirHandle.h"
+#include "ff.h"
+//#include "Debug.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+/*
+Currnet time is returned with packed into a DWORD value. The bit field is as follows:
+bit31:25
+Year from 1980 (0..127)
+bit24:21
+Month (1..12)
+bit20:16
+Day in month(1..31)
+bit15:11
+Hour (0..23)
+bit10:5
+Minute (0..59)
+bit4:0
+Second / 2 (0..29)
+
+
+int tm_sec;
+int tm_min;
+int tm_hour;
+int tm_mday;
+int tm_mon;
+int tm_year;
+int tm_wday;
+int tm_yday;
+int tm_isdst;
+
+*/
+
+DWORD get_fattime (void) {
+  time_t rawtime;
+  struct tm *ptm;
+  time ( &rawtime );
+  ptm = localtime ( &rawtime );
+  FFSDEBUG("DTM: %d/%d/%d %d:%d:%d\n",ptm->tm_year,ptm->tm_mon,ptm->tm_mday,ptm->tm_hour,ptm->tm_min,ptm->tm_sec);
+  DWORD fattime = (DWORD)(ptm->tm_year - 80) << 25
+                | (DWORD)(ptm->tm_mon + 1) << 21
+                | (DWORD)(ptm->tm_mday) << 16
+                | (DWORD)(ptm->tm_hour) << 11
+                | (DWORD)(ptm->tm_min) << 5
+                | (DWORD)(ptm->tm_sec/2);
+ 
+  FFSDEBUG("Converted: %x\n",fattime);
+  return fattime;
+}
+
+namespace mbed {
+
+#if FFSDEBUG_ENABLED
+static const char *FR_ERRORS[] = {
+    "FR_OK = 0", 
+    "FR_NOT_READY",          
+    "FR_NO_FILE",              
+    "FR_NO_PATH",             
+    "FR_INVALID_NAME",     
+    "FR_INVALID_DRIVE",      
+    "FR_DENIED",              
+    "FR_EXIST",              
+    "FR_RW_ERROR",          
+    "FR_WRITE_PROTECTED", 
+    "FR_NOT_ENABLED",    
+    "FR_NO_FILESYSTEM",    
+    "FR_INVALID_OBJECT",    
+    "FR_MKFS_ABORTED"    
+};
+#endif
+
+FATFileSystem *FATFileSystem::_ffs[_VOLUMES] = {0};
+
+FATFileSystem::FATFileSystem(const char* n) : FileSystemLike(n) {
+    FFSDEBUG("FATFileSystem(%s)\n", n);
+    for(int i=0; i<_VOLUMES; i++) {
+        if(_ffs[i] == 0) {
+            _ffs[i] = this;
+            _fsid = i;
+            FFSDEBUG("Mounting [%s] on ffs drive [%d]\n", _name, _fsid);
+            f_mount(i, &_fs);
+            return;
+        }
+    }
+    error("Couldn't create %s in FATFileSystem::FATFileSystem\n",n);
+}
+    
+FATFileSystem::~FATFileSystem() {
+    for(int i=0; i<_VOLUMES; i++) {
+        if(_ffs[i] == this) {
+            _ffs[i] = 0;
+            f_mount(i, NULL);
+        }
+    }
+}
+    
+FileHandle *FATFileSystem::open(const char* name, int flags) {
+    FFSDEBUG("open(%s) on filesystem [%s], drv [%d]\n", name, _name, _fsid);
+    char n[64];
+    sprintf(n, "%d:/%s", _fsid, name);
+
+    /* POSIX flags -> FatFS open mode */
+    BYTE openmode;
+    if(flags & O_RDWR) {
+        openmode = FA_READ|FA_WRITE;
+    } else if(flags & O_WRONLY) {
+        openmode = FA_WRITE;
+    } else {
+        openmode = FA_READ;
+    }
+    if(flags & O_CREAT) {
+        if(flags & O_TRUNC) {
+            openmode |= FA_CREATE_ALWAYS;
+        } else {
+            openmode |= FA_OPEN_ALWAYS;
+        }
+    }
+
+    FIL fh;
+    FRESULT res = f_open(&fh, n, openmode);
+    if(res) { 
+        FFSDEBUG("f_open('w') failed (%d, %s)\n", res, FR_ERRORS[res]);
+        return NULL;
+    }
+    if(flags & O_APPEND) {
+        f_lseek(&fh, fh.fsize);
+    }
+    return new FATFileHandle(fh);
+}
+    
+int FATFileSystem::remove(const char *filename) {
+    FRESULT res = f_unlink(filename);
+    if(res) { 
+        FFSDEBUG("f_unlink() failed (%d, %s)\n", res, FR_ERRORS[res]);
+        return -1;
+    }
+    return 0;
+}
+
+int FATFileSystem::format() {
+    FFSDEBUG("format()\n");
+    FRESULT res = f_mkfs(_fsid, 0, 512); // Logical drive number, Partitioning rule, Allocation unit size (bytes per cluster)
+    if(res) {
+        FFSDEBUG("f_mkfs() failed (%d, %s)\n", res, FR_ERRORS[res]);
+        return -1;
+    }
+    return 0;
+}
+
+DirHandle *FATFileSystem::opendir(const char *name) {
+    FATFS_DIR dir;
+    FRESULT res = f_opendir(&dir, name);
+    if(res != 0) {
+        return NULL;
+    }
+    return new FATDirHandle(dir);
+}
+
+int FATFileSystem::mkdir(const char *name, mode_t mode) {
+    FRESULT res = f_mkdir(name);
+    return res == 0 ? 0 : -1;
+}
+
+} // namespace mbed