Matthew Else / SDFileSystem

Fork of SDFileSystem with fixed version of FATFileSystem

Dependencies:   FATFileSystem

Fork of SDFileSystem by Neil Thiessen

FATFileSystem/ChaN/diskio.cpp@11:67ddc53e3983, 2014-08-14 (annotated)

Committer:
neilt6
Date:
Thu Aug 14 22:27:07 2014 +0000
Revision:
11:67ddc53e3983
Major performance improvements with custom FATFileSystem

Who changed what in which revision?

UserRevisionLine numberNew contents of line
neilt6 11:67ddc53e3983 1 /*-----------------------------------------------------------------------*/
neilt6 11:67ddc53e3983 2 /* Low level disk I/O module skeleton for FatFs (C)ChaN, 2007 */
neilt6 11:67ddc53e3983 3 /*-----------------------------------------------------------------------*/
neilt6 11:67ddc53e3983 4 /* This is a stub disk I/O module that acts as front end of the existing */
neilt6 11:67ddc53e3983 5 /* disk I/O modules and attach it to FatFs module with common interface. */
neilt6 11:67ddc53e3983 6 /*-----------------------------------------------------------------------*/
neilt6 11:67ddc53e3983 7 #include "ffconf.h"
neilt6 11:67ddc53e3983 8 #include "diskio.h"
neilt6 11:67ddc53e3983 9
neilt6 11:67ddc53e3983 10 #include "mbed_debug.h"
neilt6 11:67ddc53e3983 11 #include "FATFileSystem.h"
neilt6 11:67ddc53e3983 12
neilt6 11:67ddc53e3983 13 using namespace mbed;
neilt6 11:67ddc53e3983 14
neilt6 11:67ddc53e3983 15 DSTATUS disk_initialize (
neilt6 11:67ddc53e3983 16 BYTE drv /* Physical drive nmuber (0..) */
neilt6 11:67ddc53e3983 17 )
neilt6 11:67ddc53e3983 18 {
neilt6 11:67ddc53e3983 19 debug_if(FFS_DBG, "disk_initialize on drv [%d]\n", drv);
neilt6 11:67ddc53e3983 20 return (DSTATUS)FATFileSystem::_ffs[drv]->disk_initialize();
neilt6 11:67ddc53e3983 21 }
neilt6 11:67ddc53e3983 22
neilt6 11:67ddc53e3983 23 DSTATUS disk_status (
neilt6 11:67ddc53e3983 24 BYTE drv /* Physical drive nmuber (0..) */
neilt6 11:67ddc53e3983 25 )
neilt6 11:67ddc53e3983 26 {
neilt6 11:67ddc53e3983 27 debug_if(FFS_DBG, "disk_status on drv [%d]\n", drv);
neilt6 11:67ddc53e3983 28 return (DSTATUS)FATFileSystem::_ffs[drv]->disk_status();
neilt6 11:67ddc53e3983 29 }
neilt6 11:67ddc53e3983 30
neilt6 11:67ddc53e3983 31 DRESULT disk_read (
neilt6 11:67ddc53e3983 32 BYTE drv, /* Physical drive nmuber (0..) */
neilt6 11:67ddc53e3983 33 BYTE *buff, /* Data buffer to store read data */
neilt6 11:67ddc53e3983 34 DWORD sector, /* Sector address (LBA) */
neilt6 11:67ddc53e3983 35 BYTE count /* Number of sectors to read (1..255) */
neilt6 11:67ddc53e3983 36 )
neilt6 11:67ddc53e3983 37 {
neilt6 11:67ddc53e3983 38 debug_if(FFS_DBG, "disk_read(sector %d, count %d) on drv [%d]\n", sector, count, drv);
neilt6 11:67ddc53e3983 39 if (FATFileSystem::_ffs[drv]->disk_read((uint8_t*)buff, sector, count))
neilt6 11:67ddc53e3983 40 return RES_PARERR;
neilt6 11:67ddc53e3983 41 else
neilt6 11:67ddc53e3983 42 return RES_OK;
neilt6 11:67ddc53e3983 43 }
neilt6 11:67ddc53e3983 44
neilt6 11:67ddc53e3983 45 #if _READONLY == 0
neilt6 11:67ddc53e3983 46 DRESULT disk_write (
neilt6 11:67ddc53e3983 47 BYTE drv, /* Physical drive nmuber (0..) */
neilt6 11:67ddc53e3983 48 const BYTE *buff, /* Data to be written */
neilt6 11:67ddc53e3983 49 DWORD sector, /* Sector address (LBA) */
neilt6 11:67ddc53e3983 50 BYTE count /* Number of sectors to write (1..255) */
neilt6 11:67ddc53e3983 51 )
neilt6 11:67ddc53e3983 52 {
neilt6 11:67ddc53e3983 53 debug_if(FFS_DBG, "disk_write(sector %d, count %d) on drv [%d]\n", sector, count, drv);
neilt6 11:67ddc53e3983 54 if (FATFileSystem::_ffs[drv]->disk_write((uint8_t*)buff, sector, count))
neilt6 11:67ddc53e3983 55 return RES_PARERR;
neilt6 11:67ddc53e3983 56 else
neilt6 11:67ddc53e3983 57 return RES_OK;
neilt6 11:67ddc53e3983 58 }
neilt6 11:67ddc53e3983 59 #endif /* _READONLY */
neilt6 11:67ddc53e3983 60
neilt6 11:67ddc53e3983 61 DRESULT disk_ioctl (
neilt6 11:67ddc53e3983 62 BYTE drv, /* Physical drive nmuber (0..) */
neilt6 11:67ddc53e3983 63 BYTE ctrl, /* Control code */
neilt6 11:67ddc53e3983 64 void *buff /* Buffer to send/receive control data */
neilt6 11:67ddc53e3983 65 )
neilt6 11:67ddc53e3983 66 {
neilt6 11:67ddc53e3983 67 debug_if(FFS_DBG, "disk_ioctl(%d)\n", ctrl);
neilt6 11:67ddc53e3983 68 switch(ctrl) {
neilt6 11:67ddc53e3983 69 case CTRL_SYNC:
neilt6 11:67ddc53e3983 70 if(FATFileSystem::_ffs[drv] == NULL) {
neilt6 11:67ddc53e3983 71 return RES_NOTRDY;
neilt6 11:67ddc53e3983 72 } else if(FATFileSystem::_ffs[drv]->disk_sync()) {
neilt6 11:67ddc53e3983 73 return RES_ERROR;
neilt6 11:67ddc53e3983 74 }
neilt6 11:67ddc53e3983 75 return RES_OK;
neilt6 11:67ddc53e3983 76 case GET_SECTOR_COUNT:
neilt6 11:67ddc53e3983 77 if(FATFileSystem::_ffs[drv] == NULL) {
neilt6 11:67ddc53e3983 78 return RES_NOTRDY;
neilt6 11:67ddc53e3983 79 } else {
neilt6 11:67ddc53e3983 80 DWORD res = FATFileSystem::_ffs[drv]->disk_sectors();
neilt6 11:67ddc53e3983 81 if(res > 0) {
neilt6 11:67ddc53e3983 82 *((DWORD*)buff) = res; // minimum allowed
neilt6 11:67ddc53e3983 83 return RES_OK;
neilt6 11:67ddc53e3983 84 } else {
neilt6 11:67ddc53e3983 85 return RES_ERROR;
neilt6 11:67ddc53e3983 86 }
neilt6 11:67ddc53e3983 87 }
neilt6 11:67ddc53e3983 88 case GET_BLOCK_SIZE:
neilt6 11:67ddc53e3983 89 *((DWORD*)buff) = 1; // default when not known
neilt6 11:67ddc53e3983 90 return RES_OK;
neilt6 11:67ddc53e3983 91
neilt6 11:67ddc53e3983 92 }
neilt6 11:67ddc53e3983 93 return RES_PARERR;
neilt6 11:67ddc53e3983 94 }