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micropython/extmod/vfs_fat_diskio.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* Original template for this file comes from:
* Low level disk I/O module skeleton for FatFs, (C)ChaN, 2013
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/mpconfig.h"
#if MICROPY_VFS && MICROPY_VFS_FAT
#include <stdint.h>
#include <stdio.h>
#include "py/mphal.h"
#include "py/runtime.h"
#include "lib/oofatfs/ff.h"
#include "lib/oofatfs/diskio.h"
#include "extmod/vfs_fat.h"
#if _MAX_SS == _MIN_SS
#define SECSIZE(fs) (_MIN_SS)
#else
#define SECSIZE(fs) ((fs)->ssize)
#endif
typedef void *bdev_t;
STATIC fs_user_mount_t *disk_get_device(void *bdev) {
return (fs_user_mount_t*)bdev;
}
/*-----------------------------------------------------------------------*/
/* Initialize a Drive */
/*-----------------------------------------------------------------------*/
STATIC
DSTATUS disk_initialize (
bdev_t pdrv /* Physical drive nmuber (0..) */
)
{
fs_user_mount_t *vfs = disk_get_device(pdrv);
if (vfs == NULL) {
return STA_NOINIT;
}
if (vfs->flags & FSUSER_HAVE_IOCTL) {
// new protocol with ioctl; call ioctl(INIT, 0)
vfs->u.ioctl[2] = MP_OBJ_NEW_SMALL_INT(BP_IOCTL_INIT);
vfs->u.ioctl[3] = MP_OBJ_NEW_SMALL_INT(0); // unused
mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->u.ioctl);
if (ret != mp_const_none && MP_OBJ_SMALL_INT_VALUE(ret) != 0) {
// error initialising
return STA_NOINIT;
}
}
if (vfs->writeblocks[0] == MP_OBJ_NULL) {
return STA_PROTECT;
} else {
return 0;
}
}
/*-----------------------------------------------------------------------*/
/* Get Disk Status */
/*-----------------------------------------------------------------------*/
STATIC
DSTATUS disk_status (
bdev_t pdrv /* Physical drive nmuber (0..) */
)
{
fs_user_mount_t *vfs = disk_get_device(pdrv);
if (vfs == NULL) {
return STA_NOINIT;
}
if (vfs->writeblocks[0] == MP_OBJ_NULL) {
return STA_PROTECT;
} else {
return 0;
}
}
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_read (
bdev_t pdrv, /* Physical drive nmuber (0..) */
BYTE *buff, /* Data buffer to store read data */
DWORD sector, /* Sector address (LBA) */
UINT count /* Number of sectors to read (1..128) */
)
{
fs_user_mount_t *vfs = disk_get_device(pdrv);
if (vfs == NULL) {
return RES_PARERR;
}
if (vfs->flags & FSUSER_NATIVE) {
mp_uint_t (*f)(uint8_t*, uint32_t, uint32_t) = (void*)(uintptr_t)vfs->readblocks[2];
if (f(buff, sector, count) != 0) {
return RES_ERROR;
}
} else {
vfs->readblocks[2] = MP_OBJ_NEW_SMALL_INT(sector);
vfs->readblocks[3] = mp_obj_new_bytearray_by_ref(count * SECSIZE(&vfs->fatfs), buff);
mp_call_method_n_kw(2, 0, vfs->readblocks);
// TODO handle error return
}
return RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Write Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_write (
bdev_t pdrv, /* Physical drive nmuber (0..) */
const BYTE *buff, /* Data to be written */
DWORD sector, /* Sector address (LBA) */
UINT count /* Number of sectors to write (1..128) */
)
{
fs_user_mount_t *vfs = disk_get_device(pdrv);
if (vfs == NULL) {
return RES_PARERR;
}
if (vfs->writeblocks[0] == MP_OBJ_NULL) {
// read-only block device
return RES_WRPRT;
}
if (vfs->flags & FSUSER_NATIVE) {
mp_uint_t (*f)(const uint8_t*, uint32_t, uint32_t) = (void*)(uintptr_t)vfs->writeblocks[2];
if (f(buff, sector, count) != 0) {
return RES_ERROR;
}
} else {
vfs->writeblocks[2] = MP_OBJ_NEW_SMALL_INT(sector);
vfs->writeblocks[3] = mp_obj_new_bytearray_by_ref(count * SECSIZE(&vfs->fatfs), (void*)buff);
mp_call_method_n_kw(2, 0, vfs->writeblocks);
// TODO handle error return
}
return RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions */
/*-----------------------------------------------------------------------*/
DRESULT disk_ioctl (
bdev_t pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
fs_user_mount_t *vfs = disk_get_device(pdrv);
if (vfs == NULL) {
return RES_PARERR;
}
if (vfs->flags & FSUSER_HAVE_IOCTL) {
// new protocol with ioctl
switch (cmd) {
case CTRL_SYNC:
vfs->u.ioctl[2] = MP_OBJ_NEW_SMALL_INT(BP_IOCTL_SYNC);
vfs->u.ioctl[3] = MP_OBJ_NEW_SMALL_INT(0); // unused
mp_call_method_n_kw(2, 0, vfs->u.ioctl);
return RES_OK;
case GET_SECTOR_COUNT: {
vfs->u.ioctl[2] = MP_OBJ_NEW_SMALL_INT(BP_IOCTL_SEC_COUNT);
vfs->u.ioctl[3] = MP_OBJ_NEW_SMALL_INT(0); // unused
mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->u.ioctl);
*((DWORD*)buff) = mp_obj_get_int(ret);
return RES_OK;
}
case GET_SECTOR_SIZE: {
vfs->u.ioctl[2] = MP_OBJ_NEW_SMALL_INT(BP_IOCTL_SEC_SIZE);
vfs->u.ioctl[3] = MP_OBJ_NEW_SMALL_INT(0); // unused
mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->u.ioctl);
if (ret == mp_const_none) {
// Default sector size
*((WORD*)buff) = 512;
} else {
*((WORD*)buff) = mp_obj_get_int(ret);
}
#if _MAX_SS != _MIN_SS
// need to store ssize because we use it in disk_read/disk_write
vfs->fatfs.ssize = *((WORD*)buff);
#endif
return RES_OK;
}
case GET_BLOCK_SIZE:
*((DWORD*)buff) = 1; // erase block size in units of sector size
return RES_OK;
case IOCTL_INIT:
*((DSTATUS*)buff) = disk_initialize(pdrv);
return RES_OK;
case IOCTL_STATUS:
*((DSTATUS*)buff) = disk_status(pdrv);
return RES_OK;
default:
return RES_PARERR;
}
} else {
// old protocol with sync and count
switch (cmd) {
case CTRL_SYNC:
if (vfs->u.old.sync[0] != MP_OBJ_NULL) {
mp_call_method_n_kw(0, 0, vfs->u.old.sync);
}
return RES_OK;
case GET_SECTOR_COUNT: {
mp_obj_t ret = mp_call_method_n_kw(0, 0, vfs->u.old.count);
*((DWORD*)buff) = mp_obj_get_int(ret);
return RES_OK;
}
case GET_SECTOR_SIZE:
*((WORD*)buff) = 512; // old protocol had fixed sector size
#if _MAX_SS != _MIN_SS
// need to store ssize because we use it in disk_read/disk_write
vfs->fatfs.ssize = 512;
#endif
return RES_OK;
case GET_BLOCK_SIZE:
*((DWORD*)buff) = 1; // erase block size in units of sector size
return RES_OK;
case IOCTL_INIT:
*((DSTATUS*)buff) = disk_initialize(pdrv);
return RES_OK;
case IOCTL_STATUS:
*((DSTATUS*)buff) = disk_status(pdrv);
return RES_OK;
default:
return RES_PARERR;
}
}
}
#endif // MICROPY_VFS && MICROPY_VFS_FAT
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