goutham dugyala / FATFilesystem_Axelta

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Dependents:   SDFileSystem_Axelta

ChaN/diskio.cpp@0:6547fbc0f7c0, 2016-11-11 (annotated)

Committer:
gauthibit
Date:
Fri Nov 11 06:39:00 2016 +0000
Revision:
0:6547fbc0f7c0
FAT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gauthibit 0:6547fbc0f7c0 1 /*-----------------------------------------------------------------------*/
gauthibit 0:6547fbc0f7c0 2 /* Low level disk I/O module skeleton for FatFs (C)ChaN, 2007 */
gauthibit 0:6547fbc0f7c0 3 /*-----------------------------------------------------------------------*/
gauthibit 0:6547fbc0f7c0 4 /* This is a stub disk I/O module that acts as front end of the existing */
gauthibit 0:6547fbc0f7c0 5 /* disk I/O modules and attach it to FatFs module with common interface. */
gauthibit 0:6547fbc0f7c0 6 /*-----------------------------------------------------------------------*/
gauthibit 0:6547fbc0f7c0 7 #include "ffconf.h"
gauthibit 0:6547fbc0f7c0 8 #include "diskio.h"
gauthibit 0:6547fbc0f7c0 9
gauthibit 0:6547fbc0f7c0 10 #include "mbed_debug.h"
gauthibit 0:6547fbc0f7c0 11 #include "FATFileSystem.h"
gauthibit 0:6547fbc0f7c0 12
gauthibit 0:6547fbc0f7c0 13 using namespace mbed;
gauthibit 0:6547fbc0f7c0 14
gauthibit 0:6547fbc0f7c0 15 DSTATUS disk_initialize (
gauthibit 0:6547fbc0f7c0 16 BYTE drv /* Physical drive nmuber (0..) */
gauthibit 0:6547fbc0f7c0 17 )
gauthibit 0:6547fbc0f7c0 18 {
gauthibit 0:6547fbc0f7c0 19 debug_if(FFS_DBG, "disk_initialize on drv [%d]\n", drv);
gauthibit 0:6547fbc0f7c0 20 return (DSTATUS)FATFileSystem::_ffs[drv]->disk_initialize();
gauthibit 0:6547fbc0f7c0 21 }
gauthibit 0:6547fbc0f7c0 22
gauthibit 0:6547fbc0f7c0 23 DSTATUS disk_status (
gauthibit 0:6547fbc0f7c0 24 BYTE drv /* Physical drive nmuber (0..) */
gauthibit 0:6547fbc0f7c0 25 )
gauthibit 0:6547fbc0f7c0 26 {
gauthibit 0:6547fbc0f7c0 27 debug_if(FFS_DBG, "disk_status on drv [%d]\n", drv);
gauthibit 0:6547fbc0f7c0 28 return (DSTATUS)FATFileSystem::_ffs[drv]->disk_status();
gauthibit 0:6547fbc0f7c0 29 }
gauthibit 0:6547fbc0f7c0 30
gauthibit 0:6547fbc0f7c0 31 DRESULT disk_read (
gauthibit 0:6547fbc0f7c0 32 BYTE drv, /* Physical drive nmuber (0..) */
gauthibit 0:6547fbc0f7c0 33 BYTE *buff, /* Data buffer to store read data */
gauthibit 0:6547fbc0f7c0 34 DWORD sector, /* Sector address (LBA) */
gauthibit 0:6547fbc0f7c0 35 BYTE count /* Number of sectors to read (1..255) */
gauthibit 0:6547fbc0f7c0 36 )
gauthibit 0:6547fbc0f7c0 37 {
gauthibit 0:6547fbc0f7c0 38 debug_if(FFS_DBG, "disk_read(sector %d, count %d) on drv [%d]\n", sector, count, drv);
gauthibit 0:6547fbc0f7c0 39 for(DWORD s=sector; s<sector+count; s++) {
gauthibit 0:6547fbc0f7c0 40 debug_if(FFS_DBG, " disk_read(sector %d)\n", s);
gauthibit 0:6547fbc0f7c0 41 int res = FATFileSystem::_ffs[drv]->disk_read((uint8_t*)buff, s);
gauthibit 0:6547fbc0f7c0 42 if(res) {
gauthibit 0:6547fbc0f7c0 43 return RES_PARERR;
gauthibit 0:6547fbc0f7c0 44 }
gauthibit 0:6547fbc0f7c0 45 buff += 512;
gauthibit 0:6547fbc0f7c0 46 }
gauthibit 0:6547fbc0f7c0 47 return RES_OK;
gauthibit 0:6547fbc0f7c0 48 }
gauthibit 0:6547fbc0f7c0 49
gauthibit 0:6547fbc0f7c0 50 #if _READONLY == 0
gauthibit 0:6547fbc0f7c0 51 DRESULT disk_write (
gauthibit 0:6547fbc0f7c0 52 BYTE drv, /* Physical drive nmuber (0..) */
gauthibit 0:6547fbc0f7c0 53 const BYTE *buff, /* Data to be written */
gauthibit 0:6547fbc0f7c0 54 DWORD sector, /* Sector address (LBA) */
gauthibit 0:6547fbc0f7c0 55 BYTE count /* Number of sectors to write (1..255) */
gauthibit 0:6547fbc0f7c0 56 )
gauthibit 0:6547fbc0f7c0 57 {
gauthibit 0:6547fbc0f7c0 58 debug_if(FFS_DBG, "disk_write(sector %d, count %d) on drv [%d]\n", sector, count, drv);
gauthibit 0:6547fbc0f7c0 59 for(DWORD s = sector; s < sector + count; s++) {
gauthibit 0:6547fbc0f7c0 60 debug_if(FFS_DBG, " disk_write(sector %d)\n", s);
gauthibit 0:6547fbc0f7c0 61 int res = FATFileSystem::_ffs[drv]->disk_write((uint8_t*)buff, s);
gauthibit 0:6547fbc0f7c0 62 if(res) {
gauthibit 0:6547fbc0f7c0 63 return RES_PARERR;
gauthibit 0:6547fbc0f7c0 64 }
gauthibit 0:6547fbc0f7c0 65 buff += 512;
gauthibit 0:6547fbc0f7c0 66 }
gauthibit 0:6547fbc0f7c0 67 return RES_OK;
gauthibit 0:6547fbc0f7c0 68 }
gauthibit 0:6547fbc0f7c0 69 #endif /* _READONLY */
gauthibit 0:6547fbc0f7c0 70
gauthibit 0:6547fbc0f7c0 71 DRESULT disk_ioctl (
gauthibit 0:6547fbc0f7c0 72 BYTE drv, /* Physical drive nmuber (0..) */
gauthibit 0:6547fbc0f7c0 73 BYTE ctrl, /* Control code */
gauthibit 0:6547fbc0f7c0 74 void *buff /* Buffer to send/receive control data */
gauthibit 0:6547fbc0f7c0 75 )
gauthibit 0:6547fbc0f7c0 76 {
gauthibit 0:6547fbc0f7c0 77 debug_if(FFS_DBG, "disk_ioctl(%d)\n", ctrl);
gauthibit 0:6547fbc0f7c0 78 switch(ctrl) {
gauthibit 0:6547fbc0f7c0 79 case CTRL_SYNC:
gauthibit 0:6547fbc0f7c0 80 if(FATFileSystem::_ffs[drv] == NULL) {
gauthibit 0:6547fbc0f7c0 81 return RES_NOTRDY;
gauthibit 0:6547fbc0f7c0 82 } else if(FATFileSystem::_ffs[drv]->disk_sync()) {
gauthibit 0:6547fbc0f7c0 83 return RES_ERROR;
gauthibit 0:6547fbc0f7c0 84 }
gauthibit 0:6547fbc0f7c0 85 return RES_OK;
gauthibit 0:6547fbc0f7c0 86 case GET_SECTOR_COUNT:
gauthibit 0:6547fbc0f7c0 87 if(FATFileSystem::_ffs[drv] == NULL) {
gauthibit 0:6547fbc0f7c0 88 return RES_NOTRDY;
gauthibit 0:6547fbc0f7c0 89 } else {
gauthibit 0:6547fbc0f7c0 90 DWORD res = FATFileSystem::_ffs[drv]->disk_sectors();
gauthibit 0:6547fbc0f7c0 91 if(res > 0) {
gauthibit 0:6547fbc0f7c0 92 *((DWORD*)buff) = res; // minimum allowed
gauthibit 0:6547fbc0f7c0 93 return RES_OK;
gauthibit 0:6547fbc0f7c0 94 } else {
gauthibit 0:6547fbc0f7c0 95 return RES_ERROR;
gauthibit 0:6547fbc0f7c0 96 }
gauthibit 0:6547fbc0f7c0 97 }
gauthibit 0:6547fbc0f7c0 98 case GET_BLOCK_SIZE:
gauthibit 0:6547fbc0f7c0 99 *((DWORD*)buff) = 1; // default when not known
gauthibit 0:6547fbc0f7c0 100 return RES_OK;
gauthibit 0:6547fbc0f7c0 101
gauthibit 0:6547fbc0f7c0 102 }
gauthibit 0:6547fbc0f7c0 103 return RES_PARERR;
gauthibit 0:6547fbc0f7c0 104 }