mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
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LocalFileSystem.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 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 #include "LocalFileSystem.h" 00017 00018 #if DEVICE_LOCALFILESYSTEM 00019 00020 #include "semihost_api.h" 00021 #include <string.h> 00022 #include <stdio.h> 00023 00024 namespace mbed { 00025 00026 /* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */ 00027 typedef struct { 00028 unsigned char hr; /* Hours [0..23] */ 00029 unsigned char min; /* Minutes [0..59] */ 00030 unsigned char sec; /* Seconds [0..59] */ 00031 unsigned char day; /* Day [1..31] */ 00032 unsigned char mon; /* Month [1..12] */ 00033 unsigned short year; /* Year [1980..2107] */ 00034 } FTIME; 00035 00036 typedef struct { /* File Search info record */ 00037 char name[32]; /* File name */ 00038 long size; /* File size in bytes */ 00039 int fileID; /* System File Identification */ 00040 FTIME create_time; /* Date & time file was created */ 00041 FTIME write_time; /* Date & time of last write */ 00042 } XFINFO; 00043 00044 #define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */ 00045 #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0) 00046 00047 static int xffind (const char *pattern, XFINFO *info) { 00048 unsigned param[4]; 00049 00050 param[0] = (unsigned long)pattern; 00051 param[1] = (unsigned long)strlen(pattern); 00052 param[2] = (unsigned long)info; 00053 param[3] = (unsigned long)sizeof(XFINFO); 00054 00055 return __semihost(USR_XFFIND, param); 00056 } 00057 00058 #define OPEN_R 0 00059 #define OPEN_B 1 00060 #define OPEN_PLUS 2 00061 #define OPEN_W 4 00062 #define OPEN_A 8 00063 #define OPEN_INVALID -1 00064 00065 int posix_to_semihost_open_flags(int flags) { 00066 /* POSIX flags -> semihosting open mode */ 00067 int openmode; 00068 if (flags & O_RDWR) { 00069 /* a plus mode */ 00070 openmode = OPEN_PLUS; 00071 if (flags & O_APPEND) { 00072 openmode |= OPEN_A; 00073 } else if (flags & O_TRUNC) { 00074 openmode |= OPEN_W; 00075 } else { 00076 openmode |= OPEN_R; 00077 } 00078 } else if (flags & O_WRONLY) { 00079 /* write or append */ 00080 if (flags & O_APPEND) { 00081 openmode = OPEN_A; 00082 } else { 00083 openmode = OPEN_W; 00084 } 00085 } else if (flags == O_RDONLY) { 00086 /* read mode */ 00087 openmode = OPEN_R; 00088 } else { 00089 /* invalid flags */ 00090 openmode = OPEN_INVALID; 00091 } 00092 00093 return openmode; 00094 } 00095 00096 FILEHANDLE local_file_open(const char* name, int flags) { 00097 int openmode = posix_to_semihost_open_flags(flags); 00098 if (openmode == OPEN_INVALID) { 00099 return (FILEHANDLE)NULL; 00100 } 00101 00102 FILEHANDLE fh = semihost_open(name, openmode); 00103 if (fh == -1) { 00104 return (FILEHANDLE)NULL; 00105 } 00106 00107 return fh; 00108 } 00109 00110 LocalFileHandle::LocalFileHandle(FILEHANDLE fh) { 00111 _fh = fh; 00112 pos = 0; 00113 } 00114 00115 int LocalFileHandle::close() { 00116 int retval = semihost_close(_fh); 00117 delete this; 00118 return retval; 00119 } 00120 00121 ssize_t LocalFileHandle::write(const void *buffer, size_t length) { 00122 ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written 00123 n = length - n; // number of characters written 00124 pos += n; 00125 return n; 00126 } 00127 00128 ssize_t LocalFileHandle::read(void *buffer, size_t length) { 00129 ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read 00130 n = length - n; // number of characters read 00131 pos += n; 00132 return n; 00133 } 00134 00135 int LocalFileHandle::isatty() { 00136 return semihost_istty(_fh); 00137 } 00138 00139 off_t LocalFileHandle::lseek(off_t position, int whence) { 00140 if (whence == SEEK_CUR) { 00141 position += pos; 00142 } else if (whence == SEEK_END) { 00143 position += semihost_flen(_fh); 00144 } /* otherwise SEEK_SET, so position is fine */ 00145 00146 /* Always seems to return -1, so just ignore for now. */ 00147 semihost_seek(_fh, position); 00148 pos = position; 00149 return position; 00150 } 00151 00152 int LocalFileHandle::fsync() { 00153 return semihost_ensure(_fh); 00154 } 00155 00156 off_t LocalFileHandle::flen() { 00157 return semihost_flen(_fh); 00158 } 00159 00160 class LocalDirHandle : public DirHandle { 00161 00162 public: 00163 struct dirent cur_entry; 00164 XFINFO info; 00165 00166 LocalDirHandle() { 00167 info.fileID = 0; 00168 } 00169 00170 virtual int closedir() { 00171 delete this; 00172 return 0; 00173 } 00174 00175 virtual struct dirent *readdir() { 00176 if (xffind("*", &info)!=0) { 00177 return NULL; 00178 } 00179 memcpy(cur_entry.d_name, info.name, sizeof(info.name)); 00180 return &cur_entry; 00181 } 00182 00183 virtual void rewinddir() { 00184 info.fileID = 0; 00185 } 00186 00187 virtual off_t telldir() { 00188 return info.fileID; 00189 } 00190 00191 virtual void seekdir(off_t offset) { 00192 info.fileID = offset; 00193 } 00194 }; 00195 00196 FileHandle *LocalFileSystem::open(const char* name, int flags) { 00197 /* reject filenames with / in them */ 00198 for (const char *tmp = name; *tmp; tmp++) { 00199 if (*tmp == '/') { 00200 return NULL; 00201 } 00202 } 00203 00204 int openmode = posix_to_semihost_open_flags(flags); 00205 if (openmode == OPEN_INVALID) { 00206 return NULL; 00207 } 00208 00209 FILEHANDLE fh = semihost_open(name, openmode); 00210 if (fh == -1) { 00211 return NULL; 00212 } 00213 return new LocalFileHandle(fh); 00214 } 00215 00216 int LocalFileSystem::remove(const char *filename) { 00217 return semihost_remove(filename); 00218 } 00219 00220 DirHandle *LocalFileSystem::opendir(const char *name) { 00221 return new LocalDirHandle(); 00222 } 00223 00224 } // namespace mbed 00225 00226 #endif
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