tiny fat file system porting to pic32

Fat 16/32 File System Statement of Work Objectives * Port an existing fat16/32 file system to replace the current file system in the Unison PIC32 RTOS * Use existing file system as a framework and replace calls to the current file system underlying routines with calls to the fat 16/32 file system. * Rework the ram file system low level routines to work with the fat 16/32 file system or replace these routines with those from the fat 16/32 system. * Upgrade opendir, closedir, readdir - small posix stub routines * Run the existing file system test program in non verbose mode to prove it works correctly. * Work using MPLAB and the PIC32 simulator. * Compile time will change from fat 16 to fat 32. * Document changes made ## Deliverables Fat 16/32 File System Statement of Work Objectives * Port an existing fat16/32 file system to replace the current file system in the Unison PIC32 RTOS * Use existing file system as a framework and replace calls to the current file system underlying routines with calls to the fat 16/32 file system. * Rework the ram file system low level routines to work with the fat 16/32 file system or replace these routines with those from the fat 16/32 system. * Run the existing file system test program in non verbose mode to prove it works correctly. * Work using MPLAB and the PIC32 simulator. * Compile time changes from fat 16 to fat 32. * Document changes made FatFS functions with mapping required and direct replacement functions in current fsys: * [f_mount][1] - Register/Unregister a Work Area <!-- --> * [f_open][2] - Open/Create a File * [f_close][3] - Close a File * [f_read][4] - Read File * [f_write][5] - Write File * [f_lseek][6] - Move File R/W Pointer * [f_truncate][7] - Truncate File * [f_sync][8] - Flush Cached Data * [f_opendir][9] - Open a Directory (replace open? by? adding opendir closedir calls) * [f_readdir][10] - Read a Directory Item (modify getdirent? and add readdir call) * [f_getfree][11] - Get Free Clusters * [f_stat][12] - Get File Status * [f_mkdir][13] - Create a Directory * [f_unlink][14] - Remove a File or Directory * [f_chmod][15] - Change Attribute * [f_rename][16] - Rename/Move a File or Directory * [f_mkfs][17] - Create a File System on the Drive * A few other routines might be required including utime for timestamping which has corresponding calendar Assumptions * All I/O will be eliminated from the system. * The timers will be present to provide measurements for the file system test. * Xprintf I/O to an internal buffer will record results. Contractor Supplied Items * mplab 8.1 or later * c32 compiler * file system test * existing source code for file system complete with a demonstration example which needs to be modified with the fat 16/32 software ([login to view URL] with credit card for 0.01 us) * file system test project currently operational in non verbose mode * tiny fatfs from: <[login to view URL]> with fat specs * other components delivered with commitment Deliverables * file system test project updated with fat16 and fat 32 software with a running file system test * documentation