fs_usb.c

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/*
 * @brief USB Mass Storage Chan FATFS simple abstraction layer
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

#include "fsusb_cfg.h"
#include "board.h"
#include "chip.h"

/*****************************************************************************
 * Private types/enumerations/variables
 ****************************************************************************/

/* Disk Status */
static volatile DSTATUS Stat = STA_NOINIT;

/* 100Hz decrement timer stopped at zero (disk_timerproc()) */
static volatile WORD Timer2;

static DISK_HANDLE_T *hDisk;

/*****************************************************************************
 * Public types/enumerations/variables
 ****************************************************************************/

/*****************************************************************************
 * Private functions
 ****************************************************************************/

/*****************************************************************************
 * Public functions
 ****************************************************************************/

/* Initialize Disk Drive */
DSTATUS disk_initialize(BYTE drv)
{
 if (drv) {
  return STA_NOINIT;    /* Supports only single drive */
 }
 /* if (Stat & STA_NODISK) return Stat; *//* No card in the socket */

 if (Stat != STA_NOINIT) {
  return Stat;     /* card is already enumerated */

 }

 #if !_FS_READONLY
 FSUSB_InitRealTimeClock();
 #endif

 /* Initialize the Card Data Strucutre */
 hDisk = FSUSB_DiskInit();

 /* Reset */
 Stat = STA_NOINIT;

 FSUSB_DiskInsertWait(hDisk); /* Wait for card to be inserted */

 /* Enumerate the card once detected. Note this function may block for a little while. */
 if (!FSUSB_DiskAcquire(hDisk)) {
  DEBUGOUT("Disk Enumeration failed...\r\n");
  return Stat;
 }

 Stat &= ~STA_NOINIT;
 return Stat;

}

/* Disk Drive miscellaneous Functions */
DRESULT disk_ioctl(BYTE drv, BYTE ctrl, void *buff)
{
 DRESULT res;

 if (drv) {
  return RES_PARERR;
 }
 if (Stat & STA_NOINIT) {
  return RES_NOTRDY;
 }

 res = RES_ERROR;

 switch (ctrl) {
 case CTRL_SYNC: /* Make sure that no pending write process */
  if (FSUSB_DiskReadyWait(hDisk, 50)) {
   res = RES_OK;
  }
  break;

 case GET_SECTOR_COUNT: /* Get number of sectors on the disk (DWORD) */
  *(DWORD *) buff = FSUSB_DiskGetSectorCnt(hDisk);
  res = RES_OK;
  break;

 case GET_SECTOR_SIZE: /* Get R/W sector size (WORD) */
  *(WORD *) buff = FSUSB_DiskGetSectorSz(hDisk);
  res = RES_OK;
  break;

 case GET_BLOCK_SIZE:/* Get erase block size in unit of sector (DWORD) */
  *(DWORD *) buff = FSUSB_DiskGetBlockSz(hDisk);
  res = RES_OK;
  break;

 default:
  res = RES_PARERR;
  break;
 }

 return res;
}

/* Read Sector(s) */
DRESULT disk_read(BYTE drv, BYTE *buff, DWORD sector, BYTE count)
{
 if (drv || !count) {
  return RES_PARERR;
 }
 if (Stat & STA_NOINIT) {
  return RES_NOTRDY;
 }

 if (FSUSB_DiskReadSectors(hDisk, buff, sector, count)) {
  return RES_OK;
 }

 return RES_ERROR;
}

/* Get Disk Status */
DSTATUS disk_status(BYTE drv)
{
 if (drv) {
  return STA_NOINIT; /* Supports only single drive */
 }
 return Stat;
}

/* Write Sector(s) */
DRESULT disk_write(BYTE drv, const BYTE *buff, DWORD sector, BYTE count)
{

 if (drv || !count) {
  return RES_PARERR;
 }
 if (Stat & STA_NOINIT) {
  return RES_NOTRDY;
 }

 if (FSUSB_DiskWriteSectors(hDisk, (void *) buff, sector, count)) {
  return RES_OK;
 }

 return RES_ERROR;
}