diskio.cpp

00001 /*-----------------------------------------------------------------------*/
00002 /* Low level disk I/O module skeleton for FatFs     (C)ChaN, 2014        */
00003 /*-----------------------------------------------------------------------*/
00004 /* If a working storage control module is available, it should be        */
00005 /* attached to the FatFs via a glue function rather than modifying it.   */
00006 /* This is an example of glue functions to attach various exsisting      */
00007 /* storage control modules to the FatFs module with a defined API.       */
00008 /*-----------------------------------------------------------------------*/
00009 
00010 #include "diskio.h"
00011 #include "mbed_debug.h"
00012 #include "FATFileSystem.h"
00013 
00014 using namespace mbed;
00015 
00016 /*-----------------------------------------------------------------------*/
00017 /* Get Drive Status                                                      */
00018 /*-----------------------------------------------------------------------*/
00019 
00020 DSTATUS disk_status (
00021     BYTE pdrv        /* Physical drive nmuber to identify the drive */
00022 )
00023 {
00024     debug_if(FFS_DBG, "disk_status on pdrv [%d]\n", pdrv);
00025     return (DSTATUS)FATFileSystem::_ffs[pdrv]->disk_status();
00026 }
00027 
00028 /*-----------------------------------------------------------------------*/
00029 /* Inidialize a Drive                                                    */
00030 /*-----------------------------------------------------------------------*/
00031 
00032 DSTATUS disk_initialize (
00033     BYTE pdrv        /* Physical drive nmuber to identify the drive */
00034 )
00035 {
00036     debug_if(FFS_DBG, "disk_initialize on pdrv [%d]\n", pdrv);
00037     return (DSTATUS)FATFileSystem::_ffs[pdrv]->disk_initialize();
00038 }
00039 
00040 /*-----------------------------------------------------------------------*/
00041 /* Read Sector(s)                                                        */
00042 /*-----------------------------------------------------------------------*/
00043 
00044 DRESULT disk_read (
00045     BYTE pdrv,       /* Physical drive nmuber to identify the drive */
00046     BYTE* buff,      /* Data buffer to store read data */
00047     DWORD sector,    /* Sector address in LBA */
00048     UINT count       /* Number of sectors to read */
00049 )
00050 {
00051     debug_if(FFS_DBG, "disk_read(sector %d, count %d) on pdrv [%d]\n", sector, count, pdrv);
00052     if (FATFileSystem::_ffs[pdrv]->disk_read((uint8_t*)buff, sector, count))
00053         return RES_PARERR;
00054     else
00055         return RES_OK;
00056 }
00057 
00058 /*-----------------------------------------------------------------------*/
00059 /* Write Sector(s)                                                       */
00060 /*-----------------------------------------------------------------------*/
00061 
00062 #if _USE_WRITE
00063 DRESULT disk_write (
00064     BYTE pdrv,           /* Physical drive nmuber to identify the drive */
00065     const BYTE* buff,    /* Data to be written */
00066     DWORD sector,        /* Sector address in LBA */
00067     UINT count           /* Number of sectors to write */
00068 )
00069 {
00070     debug_if(FFS_DBG, "disk_write(sector %d, count %d) on pdrv [%d]\n", sector, count, pdrv);
00071     if (FATFileSystem::_ffs[pdrv]->disk_write((uint8_t*)buff, sector, count))
00072         return RES_PARERR;
00073     else
00074         return RES_OK;
00075 }
00076 #endif
00077 
00078 /*-----------------------------------------------------------------------*/
00079 /* Miscellaneous Functions                                               */
00080 /*-----------------------------------------------------------------------*/
00081 
00082 #if _USE_IOCTL
00083 DRESULT disk_ioctl (
00084     BYTE pdrv,        /* Physical drive nmuber (0..) */
00085     BYTE cmd,         /* Control code */
00086     void* buff        /* Buffer to send/receive control data */
00087 )
00088 {
00089     debug_if(FFS_DBG, "disk_ioctl(%d)\n", cmd);
00090     switch(cmd) {
00091         case CTRL_SYNC:
00092             if(FATFileSystem::_ffs[pdrv] == NULL) {
00093                 return RES_NOTRDY;
00094             } else if(FATFileSystem::_ffs[pdrv]->disk_sync()) {
00095                 return RES_ERROR;
00096             }
00097             return RES_OK;
00098         case GET_SECTOR_COUNT:
00099             if(FATFileSystem::_ffs[pdrv] == NULL) {
00100                 return RES_NOTRDY;
00101             } else {
00102                 DWORD res = FATFileSystem::_ffs[pdrv]->disk_sectors();
00103                 if(res > 0) {
00104                     *((DWORD*)buff) = res; // minimum allowed
00105                     return RES_OK;
00106                 } else {
00107                     return RES_ERROR;
00108                 }
00109             }
00110         case GET_BLOCK_SIZE:
00111             *((DWORD*)buff) = 1; // default when not known
00112             return RES_OK;
00113 
00114     }
00115     return RES_PARERR;
00116 }
00117 #endif