micropython/ports/stm32/mboot/vfs_fat.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019-2020 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/mphal.h"
#include "lib/oofatfs/ff.h"
#include "lib/oofatfs/diskio.h"
#include "mboot.h"
#include "vfs.h"
#if MBOOT_FSLOAD && MBOOT_VFS_FAT
#if FF_MAX_SS == FF_MIN_SS
#define SECSIZE (FF_MIN_SS)
#else
#error Unsupported
#endif
DRESULT disk_read(void *pdrv, BYTE *buf, DWORD sector, UINT count) {
vfs_fat_context_t *ctx = pdrv;
if (0 <= sector && sector < ctx->bdev_num_blocks) {
mboot_addr_t addr = ctx->bdev_base_addr + (mboot_addr_t)sector * (mboot_addr_t)SECSIZE;
hw_read(addr, count * SECSIZE, buf);
return RES_OK;
}
return RES_PARERR;
}
DRESULT disk_ioctl(void *pdrv, BYTE cmd, void *buf) {
vfs_fat_context_t *ctx = pdrv;
switch (cmd) {
case CTRL_SYNC:
return RES_OK;
case GET_SECTOR_COUNT:
*((DWORD *)buf) = ctx->bdev_num_blocks;
return RES_OK;
case GET_SECTOR_SIZE:
*((WORD *)buf) = SECSIZE;
return RES_OK;
case GET_BLOCK_SIZE:
*((DWORD *)buf) = 1; // erase block size in units of sector size
return RES_OK;
case IOCTL_INIT:
case IOCTL_STATUS:
*((DSTATUS *)buf) = STA_PROTECT;
return RES_OK;
default:
return RES_PARERR;
}
}
int vfs_fat_mount(vfs_fat_context_t *ctx, mboot_addr_t base_addr, mboot_addr_t byte_len) {
ctx->bdev_base_addr = base_addr;
ctx->bdev_num_blocks = byte_len / SECSIZE;
ctx->fatfs.drv = ctx;
FRESULT res = f_mount(&ctx->fatfs);
if (res != FR_OK) {
return -MBOOT_ERRNO_VFS_FAT_MOUNT_FAILED;
}
return 0;
}
static int vfs_fat_stream_open(void *stream_in, const char *fname) {
vfs_fat_context_t *stream = stream_in;
FRESULT res = f_open(&stream->fatfs, &stream->fp, fname, FA_READ);
if (res != FR_OK) {
return -MBOOT_ERRNO_VFS_FAT_OPEN_FAILED;
}
return 0;
}
static void vfs_fat_stream_close(void *stream_in) {
vfs_fat_context_t *stream = stream_in;
f_close(&stream->fp);
}
static int vfs_fat_stream_read(void *stream_in, uint8_t *buf, size_t len) {
vfs_fat_context_t *stream = stream_in;
UINT n;
FRESULT res = f_read(&stream->fp, buf, len, &n);
if (res != FR_OK) {
return -1;
}
return n;
}
const stream_methods_t vfs_fat_stream_methods = {
vfs_fat_stream_open,
vfs_fat_stream_close,
vfs_fat_stream_read,
};
#endif // MBOOT_FSLOAD && MBOOT_VFS_FAT