directoryEntry Struct Reference

FAT short directory entry. More... #include <FatStructs.h> List of all members. Public Attributes uint8_t  name [11] uint8_t  attributes uint8_t  reservedNT uint8_t  creationTimeTenths uint16_t  creationTime uint16_t  creationDate uint16_t  lastAccessDate uint16_t  firstClusterHigh uint16_t  lastWriteTime uint16_t  lastWriteDate uint16_t  firstClusterLow uint32_t  fileSize Detailed Description FAT short directory entry. Short means short 8.3 name, not the entry size. Date Format. A FAT directory entry date stamp is a 16-bit field that is basically a date relative to the MS-DOS epoch of 01/01/1980. Here is the format (bit 0 is the LSB of the 16-bit word, bit 15 is the MSB of the 16-bit word): Bits 9-15: Count of years from 1980, valid value range 0-127 inclusive (1980-2107). Bits 5-8: Month of year, 1 = January, valid value range 1-12 inclusive. Bits 0-4: Day of month, valid value range 1-31 inclusive. Time Format. A FAT directory entry time stamp is a 16-bit field that has a granularity of 2 seconds. Here is the format (bit 0 is the LSB of the 16-bit word, bit 15 is the MSB of the 16-bit word). Bits 11-15: Hours, valid value range 0-23 inclusive. Bits 5-10: Minutes, valid value range 0-59 inclusive. Bits 0-4: 2-second count, valid value range 0-29 inclusive (0 - 58 seconds). The valid time range is from Midnight 00:00:00 to 23:59:58. Member Data Documentation uint8_t directoryEntry::attributes Entry attributes. The upper two bits of the attribute byte are reserved and should always be set to 0 when a file is created and never modified or looked at after that. See defines that begin with DIR_ATT_. uint16_t directoryEntry::creationDate Date file was created. uint16_t directoryEntry::creationTime Time file was created. uint8_t directoryEntry::creationTimeTenths The granularity of the seconds part of creationTime is 2 seconds so this field is a count of tenths of a second and its valid value range is 0-199 inclusive. (WHG note - seems to be hundredths) uint32_t directoryEntry::fileSize 32-bit unsigned holding this file's size in bytes. uint16_t directoryEntry::firstClusterHigh High word of this entry's first cluster number (always 0 for a FAT12 or FAT16 volume). uint16_t directoryEntry::firstClusterLow Low word of this entry's first cluster number. uint16_t directoryEntry::lastAccessDate Last access date. Note that there is no last access time, only a date. This is the date of last read or write. In the case of a write, this should be set to the same date as lastWriteDate. uint16_t directoryEntry::lastWriteDate Date of last write. File creation is considered a write. uint16_t directoryEntry::lastWriteTime Time of last write. File creation is considered a write. uint8_t directoryEntry::name[11] Short 8.3 name. The first eight bytes contain the file name with blank fill. The last three bytes contain the file extension with blank fill. uint8_t directoryEntry::reservedNT Reserved for use by Windows NT. Set value to 0 when a file is created and never modify or look at it after that. The documentation for this struct was generated from the following file: Arduino/libraries/SdFat/FatStructs.h Generated on Wed Dec 23 08:22:21 2009 for SdFat by  1.6.1