fs: expose generic ramdisk/flash disk access functions

This patch removes "FAT" from  files names, config names and
symbol names so as to avoid confusion, when other modules use
them in a more generic way.

Also flash_disk_access.c and ram_disk_access.c now exports generic
disk_access symbols as defined in include/disk_access.h rather
than FAT specific ones in fs/fat_diskio.h. Thus modules like
USB which need to use disk_access interface is not dependent
on symbols from ELMChan FAT module. Also fat_diskio.h
is removed.

Further the shim between ELM chan and Zephyr is modified as
per these changes.

Change-Id: Ifd80f14a629e467ee9c7a9aaff8a4896eed11982
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
This commit is contained in:
Jithu Joseph 2016-11-01 19:24:25 -07:00 committed by Anas Nashif
commit 2fe288b4aa
9 changed files with 546 additions and 159 deletions

View file

@ -26,7 +26,8 @@
/----------------------------------------------------------------------------*/
#include <diskio.h> /* FatFs lower layer API */
#include <fs/fat_diskio.h>
#include <ffconf.h>
#include <disk_access.h>
/*-----------------------------------------------------------------------*/
/* Get Drive Status */
@ -34,7 +35,11 @@
DSTATUS disk_status(BYTE pdrv)
{
return fat_disk_status();
if (disk_access_status() != 0) {
return STA_NOINIT;
} else {
return RES_OK;
}
}
/*-----------------------------------------------------------------------*/
@ -43,7 +48,11 @@ DSTATUS disk_status(BYTE pdrv)
DSTATUS disk_initialize(BYTE pdrv)
{
return fat_disk_initialize();
if (disk_access_init() != 0) {
return STA_NOINIT;
} else {
return RES_OK;
}
}
/*-----------------------------------------------------------------------*/
@ -52,7 +61,12 @@ DSTATUS disk_initialize(BYTE pdrv)
DRESULT disk_read(BYTE pdrv, BYTE *buff, DWORD sector, UINT count)
{
return fat_disk_read(buff, sector, count);
if (disk_access_read(buff, sector, count) != 0) {
return RES_ERROR;
} else {
return RES_OK;
}
}
/*-----------------------------------------------------------------------*/
@ -60,7 +74,11 @@ DRESULT disk_read(BYTE pdrv, BYTE *buff, DWORD sector, UINT count)
/*-----------------------------------------------------------------------*/
DRESULT disk_write(BYTE pdrv, const BYTE *buff, DWORD sector, UINT count)
{
return fat_disk_write(buff, sector, count);
if(disk_access_write(buff, sector, count) != 0) {
return RES_ERROR;
} else {
return RES_OK;
}
}
/*-----------------------------------------------------------------------*/
@ -69,5 +87,33 @@ DRESULT disk_write(BYTE pdrv, const BYTE *buff, DWORD sector, UINT count)
DRESULT disk_ioctl(BYTE pdrv, BYTE cmd, void *buff)
{
return fat_disk_ioctl(cmd, buff);
int ret = RES_OK;
uint32_t tmp = 0;
switch (cmd) {
case CTRL_SYNC:
if(disk_access_ioctl(DISK_IOCTL_CTRL_SYNC, buff) != 0) {
ret = RES_ERROR;
}
break;
case GET_SECTOR_COUNT:
if (disk_access_ioctl(DISK_IOCTL_GET_DISK_SIZE, &tmp) != 0) {
ret = RES_ERROR;
} else {
*(uint32_t *) buff = (tmp / _MIN_SS) ;
}
break;
case GET_BLOCK_SIZE:
if (disk_access_ioctl(DISK_IOCTL_GET_ERASE_BLOCK_SZ, buff) != 0) {
ret = RES_ERROR;
}
break;
default:
ret = RES_PARERR;
break;
}
return ret;
}

View file

@ -1,30 +0,0 @@
/*
* Copyright (c) 2016 Intel Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _FAT_DISKIO_H_
#define _FAT_DISKIO_H_
#include <diskio.h>
#include <stdint.h>
DSTATUS fat_disk_status(void);
DSTATUS fat_disk_initialize(void);
DRESULT fat_disk_read(uint8_t *buff, unsigned long sector, uint32_t count);
DRESULT fat_disk_write(const uint8_t *buff, unsigned long sector,
uint32_t count);
DRESULT fat_disk_ioctl(uint8_t cmd, void *buff);
#endif /* _FAT_DISKIO_H_ */

View file

@ -40,14 +40,14 @@ config FILE_SYSTEM_FAT
choice
prompt "Storage backend selection"
config FS_FAT_RAM_DISK
config DISK_ACCESS_RAM
bool "RAM Disk"
help
RAM buffer used to emulate storage disk.
This option can used to test the file
system.
config FS_FAT_FLASH_DISK
config DISK_ACCESS_FLASH
bool "Flash"
help
Flash device is used for the file system.
@ -56,20 +56,20 @@ endchoice
config FS_VOLUME_SIZE
hex
default 0x18000 if FS_FAT_RAM_DISK
default 0x18000 if DISK_ACCESS_RAM
default 0x200000 if FS_FAT_FLASH_DISK_W25QXXDV
help
This is the file system volume size in bytes.
config FS_BLOCK_SIZE
hex
default 0x1000 if FS_FAT_RAM_DISK
default 0x1000 if DISK_ACCESS_RAM
default 0x1000 if FS_FAT_FLASH_DISK_W25QXXDV
help
This is typically the minimum block size that
is erased at one time in flash storage.
if FS_FAT_FLASH_DISK
if DISK_ACCESS_FLASH
config FS_FAT_FLASH_DISK_W25QXXDV
bool "W25QXXDV flash component"
@ -108,7 +108,7 @@ config FS_FLASH_ERASE_ALIGNMENT
the flash component.
endif # FS_FAT_FLASH_DISK_W25QXXDV
endif # FS_FAT_FLASH_DISK
endif # DISK_ACCESS_FLASH
endif # FILE_SYSTEM
endmenu

View file

@ -1,4 +1,5 @@
obj-$(CONFIG_FS_FAT_RAM_DISK) += fat_ram_diskio.o
obj-$(CONFIG_FS_FAT_FLASH_DISK) += fat_flash_diskio.o
obj-$(CONFIG_FILE_SYSTEM_FAT) += fat_fs.o
obj-$(CONFIG_FILE_SYSTEM_SHELL) += shell.o
obj-$(CONFIG_FILE_SYSTEM_FAT) += fat_fs.o
obj-$(CONFIG_DISK_ACCESS_RAM) += disk_access_ram.o
obj-$(CONFIG_DISK_ACCESS_FLASH) += disk_access_flash.o

View file

@ -18,11 +18,13 @@
#include <stdint.h>
#include <misc/__assert.h>
#include <misc/util.h>
#include <diskio.h>
#include <ff.h>
#include <disk_access.h>
#include <errno.h>
#include <device.h>
#include <flash.h>
#define SECTOR_SIZE 512
static struct device *flash_dev;
/* flash read-copy-erase-write operation */
@ -40,36 +42,36 @@ static off_t lba_to_address(uint32_t sector_num)
{
off_t flash_addr;
flash_addr = CONFIG_FS_FLASH_START + sector_num * _MIN_SS;
flash_addr = CONFIG_FS_FLASH_START + sector_num * SECTOR_SIZE;
__ASSERT(flash_addr < (CONFIG_FS_FLASH_START + CONFIG_FS_VOLUME_SIZE),
"FS bound error");
return flash_addr;
}
DSTATUS fat_disk_status(void)
int disk_access_status(void)
{
if (!flash_dev) {
return STA_NOINIT;
return DISK_STATUS_NOMEDIA;
}
return RES_OK;
return DISK_STATUS_OK;
}
DSTATUS fat_disk_initialize(void)
int disk_access_init(void)
{
if (flash_dev) {
return RES_OK;
return 0;
}
flash_dev = device_get_binding(CONFIG_FS_FLASH_DEV_NAME);
if (!flash_dev) {
return STA_NOINIT;
return -ENODEV;
}
return RES_OK;
return 0;
}
DRESULT fat_disk_read(void *buff, uint32_t start_sector,
int disk_access_read(uint8_t *buff, uint32_t start_sector,
uint32_t sector_count)
{
off_t fl_addr;
@ -78,7 +80,7 @@ DRESULT fat_disk_read(void *buff, uint32_t start_sector,
uint32_t num_read;
fl_addr = lba_to_address(start_sector);
remaining = (sector_count * _MIN_SS);
remaining = (sector_count * SECTOR_SIZE);
len = CONFIG_FS_FLASH_MAX_RW_SIZE;
num_read = GET_NUM_BLOCK(remaining, CONFIG_FS_FLASH_MAX_RW_SIZE);
@ -89,7 +91,7 @@ DRESULT fat_disk_read(void *buff, uint32_t start_sector,
}
if (flash_read(flash_dev, fl_addr, buff, len) != 0) {
return RES_ERROR;
return -EIO;
}
fl_addr += len;
@ -97,11 +99,11 @@ DRESULT fat_disk_read(void *buff, uint32_t start_sector,
remaining -= len;
}
return RES_OK;
return 0;
}
/* This performs read-copy into an output buffer */
static DRESULT read_copy_flash_block(off_t start_addr, uint32_t size,
static int read_copy_flash_block(off_t start_addr, uint32_t size,
const void *src_buff,
uint8_t *dest_buff)
{
@ -126,18 +128,18 @@ static DRESULT read_copy_flash_block(off_t start_addr, uint32_t size,
fl_addr + (CONFIG_FS_FLASH_MAX_RW_SIZE * i),
dest_buff + (CONFIG_FS_FLASH_MAX_RW_SIZE * i),
CONFIG_FS_FLASH_MAX_RW_SIZE) != 0) {
return RES_ERROR;
return -EIO;
}
}
/* overwrite with user data */
memcpy(dest_buff + offset, src_buff, size);
return RES_OK;
return 0;
}
/* input size is either less or equal to a block size, CONFIG_FS_BLOCK_SIZE. */
static DRESULT update_flash_block(off_t start_addr, uint32_t size,
static int update_flash_block(off_t start_addr, uint32_t size,
const void *buff)
{
off_t fl_addr;
@ -147,8 +149,8 @@ static DRESULT update_flash_block(off_t start_addr, uint32_t size,
/* if size is a partial block, perform read-copy with user data */
if (size < CONFIG_FS_BLOCK_SIZE) {
if (read_copy_flash_block(start_addr, size, buff, fs_buff) !=
RES_OK) {
return RES_ERROR;
0) {
return -EIO;
}
/* now use the local buffer as the source */
@ -161,7 +163,7 @@ static DRESULT update_flash_block(off_t start_addr, uint32_t size,
/* disable write-protection first before erase */
flash_write_protection_set(flash_dev, false);
if (flash_erase(flash_dev, fl_addr, CONFIG_FS_BLOCK_SIZE) != 0) {
return RES_ERROR;
return -EIO;
}
/* write data to flash */
@ -174,17 +176,17 @@ static DRESULT update_flash_block(off_t start_addr, uint32_t size,
if (flash_write(flash_dev, fl_addr, src,
CONFIG_FS_FLASH_MAX_RW_SIZE) != 0) {
return RES_ERROR;
return -EIO;
}
fl_addr += CONFIG_FS_FLASH_MAX_RW_SIZE;
src += CONFIG_FS_FLASH_MAX_RW_SIZE;
}
return RES_OK;
return 0;
}
DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
int disk_access_write(const uint8_t *buff, uint32_t start_sector,
uint32_t sector_count)
{
off_t fl_addr;
@ -192,7 +194,7 @@ DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
uint32_t size;
fl_addr = lba_to_address(start_sector);
remaining = (sector_count * _MIN_SS);
remaining = (sector_count * SECTOR_SIZE);
/* check if start address is erased-aligned address */
if (fl_addr & (CONFIG_FS_FLASH_ERASE_ALIGNMENT - 1)) {
@ -204,9 +206,9 @@ DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
~(CONFIG_FS_BLOCK_SIZE - 1))) {
/* not over block boundary (a partial block also) */
if (update_flash_block(fl_addr, remaining, buff) != 0) {
return RES_ERROR;
return -EIO;
}
return RES_OK;
return 0;
}
/* write goes over block boundary */
@ -214,7 +216,7 @@ DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
/* write first partial block */
if (update_flash_block(fl_addr, size, buff) != 0) {
return RES_ERROR;
return -EIO;
}
fl_addr += size;
@ -230,7 +232,7 @@ DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
if (update_flash_block(fl_addr, CONFIG_FS_BLOCK_SIZE,
buff) != 0) {
return RES_ERROR;
return -EIO;
}
fl_addr += CONFIG_FS_BLOCK_SIZE;
@ -241,27 +243,33 @@ DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
/* remaining partial block */
if (remaining) {
if (update_flash_block(fl_addr, remaining, buff) != 0) {
return RES_ERROR;
return -EIO;
}
}
return RES_OK;
return 0;
}
DRESULT fat_disk_ioctl(uint8_t cmd, void *buff)
int disk_access_ioctl(uint8_t cmd, void *buff)
{
switch (cmd) {
case CTRL_SYNC:
return RES_OK;
case GET_SECTOR_COUNT:
*(uint32_t *)buff = CONFIG_FS_VOLUME_SIZE / _MIN_SS;
return RES_OK;
case GET_BLOCK_SIZE: /* in sectors */
*(uint32_t *)buff = CONFIG_FS_BLOCK_SIZE / _MIN_SS;
return RES_OK;
case CTRL_TRIM:
case DISK_IOCTL_CTRL_SYNC:
return 0;
case DISK_IOCTL_GET_SECTOR_COUNT:
*(uint32_t *)buff = CONFIG_FS_VOLUME_SIZE / SECTOR_SIZE;
return 0;
case DISK_IOCTL_GET_SECTOR_SIZE:
*(uint32_t *) buff = SECTOR_SIZE;
return 0;
case DISK_IOCTL_GET_ERASE_BLOCK_SZ: /* in sectors */
*(uint32_t *)buff = CONFIG_FS_BLOCK_SIZE / SECTOR_SIZE;
return 0;
case DISK_IOCTL_GET_DISK_SIZE:
*(uint32_t *)buff = CONFIG_FS_VOLUME_SIZE;
return 0;
default:
break;
}
return RES_PARERR;
return -EINVAL;
}

View file

@ -0,0 +1,91 @@
/*
* Copyright (c) 2016 Intel Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string.h>
#include <stdint.h>
#include <misc/__assert.h>
#include <disk_access.h>
#include <errno.h>
#define RAMDISK_SECTOR_SIZE 512
#if defined(CONFIG_USB_MASS_STORAGE)
/* A 16KB initialized RAMdisk which will fit on most target's RAM. It
* is initialized with a valid file system for validating USB mass storage.
*/
#include "fat12_ramdisk.h"
#else
/* A 96KB RAM Disk, which meets ELM FAT fs's minimum block requirement. Fit for
* qemu testing (as it may exceed target's RAM limits).
*/
#define RAMDISK_VOLUME_SIZE (192 * RAMDISK_SECTOR_SIZE)
static uint8_t ramdisk_buf[RAMDISK_VOLUME_SIZE];
#endif
static void *lba_to_address(uint32_t lba)
{
__ASSERT(((lba * RAMDISK_SECTOR_SIZE) < RAMDISK_VOLUME_SIZE),
"FS bound error");
return &ramdisk_buf[(lba * RAMDISK_SECTOR_SIZE)];
}
int disk_access_status(void)
{
return DISK_STATUS_OK;
}
int disk_access_init(void)
{
return 0;
}
int disk_access_read(uint8_t *buff, uint32_t sector, uint32_t count)
{
memcpy(buff, lba_to_address(sector), count * RAMDISK_SECTOR_SIZE);
return 0;
}
int disk_access_write(const uint8_t *buff, uint32_t sector, uint32_t count)
{
memcpy(lba_to_address(sector), buff, count * RAMDISK_SECTOR_SIZE);
return 0;
}
int disk_access_ioctl(uint8_t cmd, void *buff)
{
switch (cmd) {
case DISK_IOCTL_CTRL_SYNC:
break;
case DISK_IOCTL_GET_SECTOR_COUNT:
*(uint32_t *) buff = RAMDISK_VOLUME_SIZE / RAMDISK_SECTOR_SIZE;
break;
case DISK_IOCTL_GET_SECTOR_SIZE:
*(uint32_t *) buff = RAMDISK_SECTOR_SIZE;
break;
case DISK_IOCTL_GET_ERASE_BLOCK_SZ:
*(uint32_t *) buff = 1;
break;
case DISK_IOCTL_GET_DISK_SIZE:
*(uint32_t *) buff = RAMDISK_VOLUME_SIZE;
break;
default:
return -EINVAL;
}
return 0;
}

340
subsys/fs/fat12_ramdisk.h Normal file
View file

@ -0,0 +1,340 @@
#ifndef __FAT12_RAMDISK_SAMPLE_H__
#define __FAT12_RAMDISK_SAMPLE_H__
#define RAMDISK_VOLUME_SIZE (32 * 512)
/* A tiny RAMdisk buffer which will fit on most target's RAM. The
* following array encodes a FAT12 partition which contains a single readme
* file within the root directory. The array initializes only 5 out of the
* 32 sectors, which need to have valid contents (though 32 x 512 = 16384
* is the total size). The 5 initialized sectors being boot sector (0),
* fat table (1, 2), directory table (3) and file(readme) contents (4).
*/
static uint8_t ramdisk_buf[RAMDISK_VOLUME_SIZE] = {
0xEB, 0x3C, 0x90, 0x4D, 0x53, 0x44, 0x4F, 0x53,
0x35, 0x2E, 0x30, 0x00, 0x02, 0x01, 0x01, 0x00,
0x01, 0x10, 0x00, 0x20, 0x00, 0xF8, 0x02, 0x00,
0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x74,
0x19, 0x02, 0x27, 0x5A, 0x45, 0x50, 0x48, 0x59,
0x52, 0x20, 0x20, 0x55, 0x53, 0x42, 0x46, 0x41,
0x54, 0x31, 0x32, 0x20, 0x20, 0x20, 0x33, 0xC9,
0x8E, 0xD1, 0xBC, 0xF0, 0x7B, 0x8E, 0xD9, 0xB8,
0x00, 0x20, 0x8E, 0xC0, 0xFC, 0xBD, 0x00, 0x7C,
0x38, 0x4E, 0x24, 0x7D, 0x24, 0x8B, 0xC1, 0x99,
0xE8, 0x3C, 0x01, 0x72, 0x1C, 0x83, 0xEB, 0x3A,
0x66, 0xA1, 0x1C, 0x7C, 0x26, 0x66, 0x3B, 0x07,
0x26, 0x8A, 0x57, 0xFC, 0x75, 0x06, 0x80, 0xCA,
0x02, 0x88, 0x56, 0x02, 0x80, 0xC3, 0x10, 0x73,
0xEB, 0x33, 0xC9, 0x8A, 0x46, 0x10, 0x98, 0xF7,
0x66, 0x16, 0x03, 0x46, 0x1C, 0x13, 0x56, 0x1E,
0x03, 0x46, 0x0E, 0x13, 0xD1, 0x8B, 0x76, 0x11,
0x60, 0x89, 0x46, 0xFC, 0x89, 0x56, 0xFE, 0xB8,
0x20, 0x00, 0xF7, 0xE6, 0x8B, 0x5E, 0x0B, 0x03,
0xC3, 0x48, 0xF7, 0xF3, 0x01, 0x46, 0xFC, 0x11,
0x4E, 0xFE, 0x61, 0xBF, 0x00, 0x00, 0xE8, 0xE6,
0x00, 0x72, 0x39, 0x26, 0x38, 0x2D, 0x74, 0x17,
0x60, 0xB1, 0x0B, 0xBE, 0xA1, 0x7D, 0xF3, 0xA6,
0x61, 0x74, 0x32, 0x4E, 0x74, 0x09, 0x83, 0xC7,
0x20, 0x3B, 0xFB, 0x72, 0xE6, 0xEB, 0xDC, 0xA0,
0xFB, 0x7D, 0xB4, 0x7D, 0x8B, 0xF0, 0xAC, 0x98,
0x40, 0x74, 0x0C, 0x48, 0x74, 0x13, 0xB4, 0x0E,
0xBB, 0x07, 0x00, 0xCD, 0x10, 0xEB, 0xEF, 0xA0,
0xFD, 0x7D, 0xEB, 0xE6, 0xA0, 0xFC, 0x7D, 0xEB,
0xE1, 0xCD, 0x16, 0xCD, 0x19, 0x26, 0x8B, 0x55,
0x1A, 0x52, 0xB0, 0x01, 0xBB, 0x00, 0x00, 0xE8,
0x3B, 0x00, 0x72, 0xE8, 0x5B, 0x8A, 0x56, 0x24,
0xBE, 0x0B, 0x7C, 0x8B, 0xFC, 0xC7, 0x46, 0xF0,
0x3D, 0x7D, 0xC7, 0x46, 0xF4, 0x29, 0x7D, 0x8C,
0xD9, 0x89, 0x4E, 0xF2, 0x89, 0x4E, 0xF6, 0xC6,
0x06, 0x96, 0x7D, 0xCB, 0xEA, 0x03, 0x00, 0x00,
0x20, 0x0F, 0xB6, 0xC8, 0x66, 0x8B, 0x46, 0xF8,
0x66, 0x03, 0x46, 0x1C, 0x66, 0x8B, 0xD0, 0x66,
0xC1, 0xEA, 0x10, 0xEB, 0x5E, 0x0F, 0xB6, 0xC8,
0x4A, 0x4A, 0x8A, 0x46, 0x0D, 0x32, 0xE4, 0xF7,
0xE2, 0x03, 0x46, 0xFC, 0x13, 0x56, 0xFE, 0xEB,
0x4A, 0x52, 0x50, 0x06, 0x53, 0x6A, 0x01, 0x6A,
0x10, 0x91, 0x8B, 0x46, 0x18, 0x96, 0x92, 0x33,
0xD2, 0xF7, 0xF6, 0x91, 0xF7, 0xF6, 0x42, 0x87,
0xCA, 0xF7, 0x76, 0x1A, 0x8A, 0xF2, 0x8A, 0xE8,
0xC0, 0xCC, 0x02, 0x0A, 0xCC, 0xB8, 0x01, 0x02,
0x80, 0x7E, 0x02, 0x0E, 0x75, 0x04, 0xB4, 0x42,
0x8B, 0xF4, 0x8A, 0x56, 0x24, 0xCD, 0x13, 0x61,
0x61, 0x72, 0x0B, 0x40, 0x75, 0x01, 0x42, 0x03,
0x5E, 0x0B, 0x49, 0x75, 0x06, 0xF8, 0xC3, 0x41,
0xBB, 0x00, 0x00, 0x60, 0x66, 0x6A, 0x00, 0xEB,
0xB0, 0x4E, 0x54, 0x4C, 0x44, 0x52, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x0D, 0x0A, 0x52, 0x65,
0x6D, 0x6F, 0x76, 0x65, 0x20, 0x64, 0x69, 0x73,
0x6B, 0x73, 0x20, 0x6F, 0x72, 0x20, 0x6F, 0x74,
0x68, 0x65, 0x72, 0x20, 0x6D, 0x65, 0x64, 0x69,
0x61, 0x2E, 0xFF, 0x0D, 0x0A, 0x44, 0x69, 0x73,
0x6B, 0x20, 0x65, 0x72, 0x72, 0x6F, 0x72, 0xFF,
0x0D, 0x0A, 0x50, 0x72, 0x65, 0x73, 0x73, 0x20,
0x61, 0x6E, 0x79, 0x20, 0x6B, 0x65, 0x79, 0x20,
0x74, 0x6F, 0x20, 0x72, 0x65, 0x73, 0x74, 0x61,
0x72, 0x74, 0x0D, 0x0A, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xAC, 0xCB, 0xD8, 0x55, 0xAA,
/* Sector 1 FAT follows */
0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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/* Sector 3 directory table - 2 entries (16 bytes) roor dir and readme file */
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/* Sector 4 Contents of README file follows */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
#endif /* __FAT12_RAMDISK_SAMPLE_H__ */

View file

@ -1,71 +0,0 @@
/*
* Copyright (c) 2016 Intel Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string.h>
#include <stdint.h>
#include <misc/__assert.h>
#include <diskio.h>
#include <ff.h>
static uint8_t file_buff[CONFIG_FS_VOLUME_SIZE];
static void *lba_to_address(uint32_t lba)
{
__ASSERT(((lba * _MIN_SS) < CONFIG_FS_VOLUME_SIZE), "FS bound error");
return &file_buff[(lba * _MIN_SS)];
}
DSTATUS fat_disk_status(void)
{
return RES_OK;
}
DSTATUS fat_disk_initialize(void)
{
return RES_OK;
}
DRESULT fat_disk_read(void *buff, uint32_t sector, uint32_t count)
{
memcpy(buff, lba_to_address(sector), count * _MIN_SS);
return RES_OK;
}
DRESULT fat_disk_write(void *buff, uint32_t sector, uint32_t count)
{
memcpy(lba_to_address(sector), buff, count * _MIN_SS);
return RES_OK;
}
DRESULT fat_disk_ioctl(uint8_t cmd, void *buff)
{
switch (cmd) {
case CTRL_SYNC:
return RES_OK;
case GET_SECTOR_COUNT:
*(uint32_t *) buff = CONFIG_FS_VOLUME_SIZE / _MIN_SS;
return RES_OK;
case GET_BLOCK_SIZE:
*(uint32_t *) buff = CONFIG_FS_BLOCK_SIZE / _MIN_SS;
return RES_OK;
case CTRL_TRIM:
break;
}
return RES_PARERR;
}

View file

@ -1,7 +1,9 @@
CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_FAT=y
CONFIG_FS_FAT_FLASH_DISK=y
CONFIG_DISK_ACCESS_FLASH=y
CONFIG_FS_FAT_FLASH_DISK_W25QXXDV=y
CONFIG_FLASH=y
CONFIG_SPI=y
CONFIG_GPIO=y
#CONFIG_DISK_ACCESS_RAM=y