Notes

Slide Show |

Outline

1 | The Flash File System User API By Eric Gregori
2 | The Dynamic Flash File System 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.
3 | User API 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.
4 | emg_open() function 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 )
5 | Example using emg_open() 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>
6 | Try it out 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>
7 | Then CAT one of the files Notice the FFS supports subdirectories. It also supports long filenames.