/firmware/LPCUSBlib_DisplayLink/fatfs/src/fs_usb.c

/*

 * @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;

}