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| Original file line number | Diff line number | Diff line change |
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| con { fixed io pins } | ||
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| LIB_VERSION = 140 ' 1.4.0 | ||
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| SF_CS = 61 { O } ' flash chip select | ||
| SF_SCLK = 60 { O } ' flash clock | ||
| SF_MOSI = 59 { O } ' flash data in | ||
| SF_MISO = 58 { I } ' flash data out | ||
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| ' SK_* ENUM values (parameter to seek() method) | ||
| ' SK_FILE_START: seek using position from start of file | ||
| ' SK_CURRENT_POSN: seek where position is relative to current seek location in file | ||
| #0, SK_Unknown, SK_FILE_START, SK_CURRENT_POSN | ||
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| E_BAD_HANDLE = -1 ' Error: Handle in invalid | ||
| E_NO_HANDLE = -2 ' Error: Out of available handles | ||
| E_FILE_NOT_FOUND = -3 ' Error: File not present | ||
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| FIRST_BLOCK = $080 ' Physical address of first block in this flash file system | ||
| LAST_BLOCK = $FFF ' Physical address of last block in this flash file system | ||
| MAX_FILES_OPEN = 2 ' Maximum number of files that can be open at one time | ||
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| BLOCKS = LAST_BLOCK - FIRST_BLOCK+1 ' Number of blocks in flash allocated to this file system | ||
| ID_TO_BLOCKS_SZ = (BLOCKS * 12 + 15) / 16 ' 12-bit fields in WORD array (rounded to full WORD) | ||
| FLAGS_SIZE = (BLOCKS * 1 + 7) / 8 ' 1-bit fields in BYTE array (rounded to full BYTE) | ||
| STATES_SIZE = (BLOCKS * 2 + 7) / 8 ' 2-bit fields in BYTE array (rounded to full BYTE) | ||
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| B_FREE = %00 ' Block is not in use (free) | ||
| B_TEMP = %01 ' Block is being put to use | ||
| B_HEAD = %10 ' Block is head of a file (contains filename) | ||
| B_BODY = %11 ' BLock is body of file (any blocks after head) | ||
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| dat { pre-initialized: driver state tracking tables } | ||
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| ' physically: 3/4 of a word (12 bits) for every valid block ID, 12 bits per ID | ||
| ' logically: a "BLOCKS"-sized array of 12-bit variables, 1 for ea. block ID - indexed by block ID | ||
| ' contains block_address in ea. 12 bit field | ||
| IDToBlocks WORD 0[ID_TO_BLOCKS_SZ] 'ID-to-block translation table | ||
| IDToBlock LONG 0 '(field pointer to 12-bit variables) | ||
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| ' physically: 1 byte for every 8 valid block IDs, 1 bit per block ID | ||
| ' logically: a "BLOCKS"-sized array of single bit variables, 1 for ea. block ID - indexed by block ID | ||
| ' contains [0,1] in ea. 1 bit field, where 1 means ID is valid | ||
| IDValids BYTE 0[FLAGS_SIZE] 'ID-valid flags | ||
| IDValid LONG 0 '(field pointer to 1-bit variables) | ||
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| ' physically: 1 byte for every 4 valid block IDs, 2 bits per block ID | ||
| ' logically: a "BLOCKS"-sized array of 2-bit variables, 1 for ea. block ID - indexed by block ID | ||
| ' contains a Block-State value in ea. 2 bit field [B_FREE, B_TEMP, B_HEAD, B_BODY] | ||
| BlockStates BYTE 0[STATES_SIZE] 'block states | ||
| BlockState LONG 0 '(field pointer to 2-bit variables) | ||
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| hStatus BYTE 0[MAX_FILES_OPEN] 'handle: status [H_READ, H_WRITE, H_REPLACE] | ||
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| pub null | ||
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| '' This is not an application | ||
| '' (invoke format() or mount() to use the flash file system) | ||
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| pub version : result | ||
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| '' Returns flash file system library version as integer | ||
| '' -- e.g., version 120 is 1.2.0 (major, minor, bugfix) | ||
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| return LIB_VERSION | ||
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| pri get_file_head_signature(p_filename) : foundSignature | nameCrc, block_address, BYTE header[8 + FILENAME_SIZE] | ||
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| ' Look up file by name and return the block state bits of the files' head block (or 0 if file not found) | ||
| ' | ||
| ' @param p_filename - address of a zstring containing the filename | ||
| ' @returns foundSignature - the block state bits of the head block (or 0 if file not found) | ||
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| ' Local Variables: | ||
| ' @local block_address - the block offset within the file system | ||
| ' @local BYTE header[FILENAME_SIZE] - a temp buffer the block's filename is read into for compare | ||
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| nameCrc := calc_crc32(p_filename, strsize(p_filename)+1) 'get CRC of filename | ||
| repeat block_address from 0 to BLOCKS - 1 'scan head blocks for filename | ||
| flash_read_block(block_address, @nameCrc, $000, $007) 'yes, read first 4+4+128 bytes of block | ||
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| pri calc_crc32(p_buffer, length) : crc | ||
| ' Calculate and return the CRC for this buffer of length bytes | ||
| ' | ||
| ' @param p_buffer - the address of the buffer | ||
| ' @returns crc - the calculated CRC for the buffer of length bytes | ||
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| 'return getcrc(p_buffer, $AD0424F3 rev 31, length) 'compute CRC of a buffered block | ||
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| pri flash_read_block(block_address, p_buffer, firstByte, lastByte) | ||
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| ' Return byte(s) read from physical block into memory at p_buffer | ||
| ' | ||
| ' @param block_address - the block offset within the file system | ||
| ' @param p_buffer - memory location in which to place the data | ||
| ' @param firstByte - address of first byte to read | ||
| ' @param lastByte - address of last byte to read |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| con { fixed io pins } | ||
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||
| LIB_VERSION = 140 ' 1.4.0 | ||
|
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||
| SF_CS = 61 { O } ' flash chip select | ||
| SF_SCLK = 60 { O } ' flash clock | ||
| SF_MOSI = 59 { O } ' flash data in | ||
| SF_MISO = 58 { I } ' flash data out | ||
|
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| ' SK_* ENUM values (parameter to seek() method) | ||
| ' SK_FILE_START: seek using position from start of file | ||
| ' SK_CURRENT_POSN: seek where position is relative to current seek location in file | ||
| #0, SK_Unknown, SK_FILE_START, SK_CURRENT_POSN | ||
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| E_BAD_HANDLE = -1 ' Error: Handle in invalid | ||
| E_NO_HANDLE = -2 ' Error: Out of available handles | ||
| E_FILE_NOT_FOUND = -3 ' Error: File not present | ||
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| FIRST_BLOCK = $080 ' Physical address of first block in this flash file system | ||
| LAST_BLOCK = $FFF ' Physical address of last block in this flash file system | ||
| MAX_FILES_OPEN = 2 ' Maximum number of files that can be open at one time | ||
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| BLOCKS = LAST_BLOCK - FIRST_BLOCK+1 ' Number of blocks in flash allocated to this file system | ||
| ID_TO_BLOCKS_SZ = (BLOCKS * 12 + 15) / 16 ' 12-bit fields in WORD array (rounded to full WORD) | ||
| FLAGS_SIZE = (BLOCKS * 1 + 7) / 8 ' 1-bit fields in BYTE array (rounded to full BYTE) | ||
| STATES_SIZE = (BLOCKS * 2 + 7) / 8 ' 2-bit fields in BYTE array (rounded to full BYTE) | ||
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| B_FREE = %00 ' Block is not in use (free) | ||
| B_TEMP = %01 ' Block is being put to use | ||
| B_HEAD = %10 ' Block is head of a file (contains filename) | ||
| B_BODY = %11 ' BLock is body of file (any blocks after head) | ||
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| dat { pre-initialized: driver state tracking tables } | ||
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| ' physically: 3/4 of a word (12 bits) for every valid block ID, 12 bits per ID | ||
| ' logically: a "BLOCKS"-sized array of 12-bit variables, 1 for ea. block ID - indexed by block ID | ||
| ' contains block_address in ea. 12 bit field | ||
| IDToBlocks WORD 0[ID_TO_BLOCKS_SZ] 'ID-to-block translation table | ||
| IDToBlock LONG 0 '(field pointer to 12-bit variables) | ||
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| ' physically: 1 byte for every 8 valid block IDs, 1 bit per block ID | ||
| ' logically: a "BLOCKS"-sized array of single bit variables, 1 for ea. block ID - indexed by block ID | ||
| ' contains [0,1] in ea. 1 bit field, where 1 means ID is valid | ||
| IDValids BYTE 0[FLAGS_SIZE] 'ID-valid flags | ||
| IDValid LONG 0 '(field pointer to 1-bit variables) | ||
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| ' physically: 1 byte for every 4 valid block IDs, 2 bits per block ID | ||
| ' logically: a "BLOCKS"-sized array of 2-bit variables, 1 for ea. block ID - indexed by block ID | ||
| ' contains a Block-State value in ea. 2 bit field [B_FREE, B_TEMP, B_HEAD, B_BODY] | ||
| BlockStates BYTE 0[STATES_SIZE] 'block states | ||
| BlockState LONG 0 '(field pointer to 2-bit variables) | ||
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| hStatus BYTE 0[MAX_FILES_OPEN] 'handle: status [H_READ, H_WRITE, H_REPLACE] | ||
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| pub null() | ||
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| '' This is not an application | ||
| '' (invoke format() or mount() to use the flash file system) | ||
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| pub version() : result | ||
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| '' Returns flash file system library version as integer | ||
| '' -- e.g., version 120 is 1.2.0 (major, minor, bugfix) | ||
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| return LIB_VERSION | ||
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| pri get_file_head_signature(p_filename) : foundSignature | nameCrc, block_address, BYTE header[8 + FILENAME_SIZE] | ||
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| ' Look up file by name and return the block state bits of the files' head block (or 0 if file not found) | ||
| ' | ||
| ' @param p_filename - address of a zstring containing the filename | ||
| ' @returns foundSignature - the block state bits of the head block (or 0 if file not found) | ||
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| ' Local Variables: | ||
| ' @local block_address - the block offset within the file system | ||
| ' @local BYTE header[FILENAME_SIZE] - a temp buffer the block's filename is read into for compare | ||
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| nameCrc := calc_crc32(p_filename, strsize(p_filename)+1) 'get CRC of filename | ||
| repeat block_address from 0 to BLOCKS - 1 'scan head blocks for filename | ||
| if field[BlockState][block_address] == B_HEAD 'is this a head block? | ||
| flash_read_block(block_address, @header, $000, $007) 'yes, read first 4+4+128 bytes of block | ||
| 'debug("* get header :", uhex_long(nameCrc,LONG[@header][1])) | ||
| if LONG[@header][1] == nameCrc 'does the filename match? | ||
| flash_read_block(block_address, @header + $008, $008, $088) 'yes, read first 4+4+128 bytes of block | ||
| if strcomp(p_filename, @header + $008) 'does the filename match? | ||
| foundSignature := LONG[@header] 'yes, return first long of header (always non-zero or logically TRUE) | ||
| quit ' end the repeat, we have our answer | ||
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| pri calc_crc32(p_buffer, length) : crc | ||
| ' Calculate and return the CRC for this buffer of length bytes | ||
| ' | ||
| ' @param p_buffer - the address of the buffer | ||
| ' @returns crc - the calculated CRC for the buffer of length bytes | ||
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| return getcrc(p_buffer, $AD0424F3 rev 31, length) 'compute CRC of a buffered block | ||
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| pri flash_read_block(block_address, p_buffer, firstByte, lastByte) | ||
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| ' Return byte(s) read from physical block into memory at p_buffer | ||
| ' | ||
| ' @param block_address - the block offset within the file system | ||
| ' @param p_buffer - memory location in which to place the data | ||
| ' @param firstByte - address of first byte to read | ||
| ' @param lastByte - address of last byte to read |
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