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Collaboration diagram for Peanut File System:
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Data Structures | |
| struct | PNUT_NODE |
| Node structure. More... | |
| struct | PNUT_DIRENTRY |
| Directory entry structure. More... | |
| struct | PNUT_FINDRESULT |
| Directory search result information structure. More... | |
| struct | _PNUTFILE |
| PNUT file descriptor structure. More... | |
Peanut File System Configuration | |
| The Nut/OS Configurator may be used to override the default values. | |
| #define | PNUT_BLOCK_SIZE 512 |
| Size of a filesystem block. | |
| #define | PNUT_DIRENT_SIZE 32 |
| Size of a directory entry. | |
| #define | PNUT_BLOCKS_PER_NODE 250 |
| Maximum number of blocks per node. | |
| #define | PNUTBANK_COUNT 30 |
Defines | |
| #define | SEEK_SET 0 |
| #define | SEEK_CUR 1 |
| #define | SEEK_END 2 |
| #define | NODETYPE_REG 0 |
| #define | NODETYPE_DIR 1 |
| #define | PNUT_MAX_NAMELEN (PNUT_DIRENT_SIZE - sizeof(PNUT_BLKNUM) - sizeof(u_char) - 1) |
| Maximum length of a base name. | |
| #define | PNUT_MAX_FILESIZE (PNUT_BLOCKS_PER_NODE * PNUT_BLOCK_SIZE) |
| Maximum size of a file or directory. | |
| #define | NUTBANK_SIZE 16384 |
| Size of each memory bank. | |
| #define | PNUT_TOTAL_BLOCKS (PNUTBANK_COUNT * (NUTBANK_SIZE / PNUT_BLOCK_SIZE)) |
| Total number of blocks on this device. | |
| #define | BLOCKS_PER_BANK (NUTBANK_SIZE / PNUT_BLOCK_SIZE) |
| #define | NUTBANK_SR 0xFF00 |
| #define | NUTBANK_START 0x8000 |
| #define | NUTBANK_PTR ((char *)NUTBANK_START) |
Typedefs | |
| typedef short | PNUT_BLKNUM |
| typedef _PNUTFILE | PNUTFILE |
| PNUT file descriptor type. | |
Functions | |
| void | BankSelect (PNUT_BLKNUM blk) |
| Make the bank visible, which contains the specified block. | |
| PNUT_NODE * | BankNodePointer (PNUT_BLKNUM blk) |
| Select specified bank and return pointer to block. | |
| int | PnutIOCtl (NUTDEVICE *dev, int req, void *conf) |
| Device specific functions. | |
Variables | |
| NUTDEVICE | devPnut |
| Peanut device information structure. | |
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Maximum number of blocks per node. Peanut supports only one node per file. Thus, this number multiplied by PNUT_BLOCK_SIZE specifies the maximum file size. Changings this number will change the size of the node structure, which must fit into a single filesystem block. |
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Maximum length of a base name. This is a calculated value and depends on the definition of the block size and the size of a directory entry. |
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Maximum size of a file or directory. This is a calculated value and depends on the definition of the block size and the number of blocks per directory entry. |
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Total number of blocks on this device. This value is calulated by multiplying the number of memory banks reserved for the file system by the number of blocks per bank. For example, if all 30 banks, which are available on Ethernut 2, are reserved for PNUT and if the size of a block is 512 bytes, then 960 blocks are available. |
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Make the bank visible, which contains the specified block. On Ethernut 2 we select a bank by writing the bank number to the bank register base address plus the bank number. For example, writing 0x12 to 0xFF12 selects bank 18 (0x12), assuming that 0xFF00 is the bank register base address.
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Initial value: {
0,
{'P', 'N', 'U', 'T', 0, 0, 0, 0, 0}
,
IFTYP_RAM,
0,
0,
0,
0,
PnutInit,
PnutIOCtl,
PnutFileRead,
PnutFileWrite,
PnutFileWrite_P,
PnutFileOpen,
PnutFileClose,
PnutFileSize
}
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