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circuitpython/extmod/vfs_fat_diskio.c

244 lines
7.8 KiB

/*
* This file is part of the MicroPython 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 "py/binary.h"
#include "py/objarray.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;
}
/*-----------------------------------------------------------------------*/
/* 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);
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->readblocks);
nlr_pop();
if (ret != mp_const_none && MP_OBJ_SMALL_INT_VALUE(ret) != 0) {
return RES_ERROR;
}
} else {
// Exception thrown by readblocks or something it calls.
return RES_ERROR;
}
}
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);
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->writeblocks);
nlr_pop();
if (ret != mp_const_none && MP_OBJ_SMALL_INT_VALUE(ret) != 0) {
return RES_ERROR;
}
} else {
// Exception thrown by writeblocks or something it calls.
return RES_ERROR;
}
}
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;
}
// First part: call the relevant method of the underlying block device
mp_obj_t ret = mp_const_none;
if (vfs->flags & FSUSER_HAVE_IOCTL) {
// new protocol with ioctl
static const uint8_t op_map[8] = {
[CTRL_SYNC] = BP_IOCTL_SYNC,
[GET_SECTOR_COUNT] = BP_IOCTL_SEC_COUNT,
[GET_SECTOR_SIZE] = BP_IOCTL_SEC_SIZE,
[IOCTL_INIT] = BP_IOCTL_INIT,
};
uint8_t bp_op = op_map[cmd & 7];
if (bp_op != 0) {
vfs->u.ioctl[2] = MP_OBJ_NEW_SMALL_INT(bp_op);
vfs->u.ioctl[3] = MP_OBJ_NEW_SMALL_INT(0); // unused
ret = mp_call_method_n_kw(2, 0, vfs->u.ioctl);
}
} 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);
}
break;
case GET_SECTOR_COUNT:
ret = mp_call_method_n_kw(0, 0, vfs->u.old.count);
break;
case GET_SECTOR_SIZE:
// old protocol has fixed sector size of 512 bytes
break;
case IOCTL_INIT:
// old protocol doesn't have init
break;
}
}
// Second part: convert the result for return
switch (cmd) {
case CTRL_SYNC:
return RES_OK;
case GET_SECTOR_COUNT: {
*((DWORD*)buff) = mp_obj_get_int(ret);
return RES_OK;
}
case GET_SECTOR_SIZE: {
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:
case IOCTL_STATUS: {
DSTATUS stat;
if (ret != mp_const_none && MP_OBJ_SMALL_INT_VALUE(ret) != 0) {
// error initialising
stat = STA_NOINIT;
} else if (vfs->writeblocks[0] == MP_OBJ_NULL) {
stat = STA_PROTECT;
} else {
stat = 0;
}
*((DSTATUS*)buff) = stat;
return RES_OK;
}
default:
return RES_PARERR;
}
}
#endif // MICROPY_VFS && MICROPY_VFS_FAT