1
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2
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- The dynamic flash file system allows the user to store data and web
pages in the on-chip flash.
- NO RESET is requires to update the data.
- As a matter of fact, no local intervention at all is required.
- The update occurs over ethernet, using port 80, to easily get through
many firewalls.
- The update can occur at anytime, the firmware automatically handles web
page requests, while a update occurs.
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3
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- A simple user API is provided, to allow user applications access to any
data stored in the FFS.
- Both binary and ascii data can be stored and retrieved from the FFS.
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4
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- The emg_open() function is used to find data in the FFS.
- //*****************************************************************************
- // int emg_open( char *filename, uint32 *data_pointer, uint32 *file_size
)
- //
- // User API to dynamic flash file system
- //
- // Finds the file descriptor in the FAT.
- // Sets data_pointer to start of data.
- // Sets file_size to size of file in bytes.
- // returns a < 0 if error, 0 = success
- //
- // for an example of using emg_open(), see cat command in menulib.c
- //
- //
- // Author: Eric Gregori (847) 651
- 1971
- // eric.gregori@freescale.com
- //*****************************************************************************
- int emg_open( char *filename, uint32 *data_pointer, uint32 *file_size )
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5
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- The CAT command uses the emg_open() function to display file contents at
the console promt.
- INET> cat ppt_files/filelist.xml
- <xml xmlns:o="urn:schemas-microsoft-com:office:office">
- <o:File
HRef="master03.htm"/>
- <o:File
HRef="master03.xml"/>
- <o:File
HRef="preview.wmf"/>
- <o:File
HRef="pres.xml"/>
- <o:File
HRef="slide0001.htm"/>
- <o:File
HRef="slide0002.htm"/>
- <o:File
HRef="master03_stylesheet.css"/>
- <o:File
HRef="script.js"/>
- <o:MainFile
HRef="../ppt.htm"/>
- <o:File
HRef="fullscreen.htm"/>
- <o:File
HRef="buttons.gif"/>
- <o:File
HRef="frame.htm"/>
- <o:File
HRef="outline.htm"/>
- <o:File
HRef="filelist.xml"/>
- </xml>
- INET>
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6
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- This PPT presentation is stored in flash.
- Try doing a dir at the inet> prompt.
- INET> dir
- Static FFS
- FILENAME
LENGTH POINTER
- readme.htm
34506 0x13E82
- CFCORESEMBLEM.gif
12919 0x1C54E
-
Total Size = 47425
- total static files = 2
- Dynamic FFS
- FILENAME
LENGTH POINTER
- ppt.htm
2744 0x201F0
- ppt_files/buttons.gif
1987 0x20CA8
- ppt_files/filelist.xml
667 0x2146B
- ppt_files/frame.htm
1313 0x21706
- ppt_files/fullscreen.htm
998 0x21C27
- ppt_files/master03.htm
1895 0x2200D
- ppt_files/master03.xml
3834 0x22774
- ppt_files/master03_stylesheet.css4002
0x2366E
- ppt_files/outline.htm
10087 0x24610
- ppt_files/pres.xml
2531 0x26D77
- ppt_files/preview.wmf
1030 0x2775A
- ppt_files/script.js
24214 0x27B60
- ppt_files/slide0001.htm
3306 0x2D9F6
- ppt_files/slide0002.htm
3262 0x2E6E0
-
Total Size = 61870
- total dynamic files = 14
- INET>
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7
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- Notice the FFS supports subdirectories.
- It also supports long filenames.
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