kamkow1
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104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
#include <devices.h>
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#include <fs_types.h>
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#include <libfat.h>
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#include <status.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <system.h>
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static void translate (size_t fs_block, size_t fs_block_count, size_t fs_block_size,
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size_t device_sector_size, size_t* out_phys_sector,
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size_t* out_sector_count) {
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size_t ratio = fs_block_size / device_sector_size;
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if (out_phys_sector != NULL)
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*out_phys_sector = fs_block * ratio;
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if (out_sector_count != NULL)
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*out_sector_count = fs_block_count * ratio;
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}
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static int fat_diskio_read (struct fatfs_ctx* ctx, uint32_t sector, uint8_t* buffer,
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uint32_t sector_count) {
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(void)ctx;
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int ret;
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size_t sector_size;
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size_t phys_sector, phys_sector_count;
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if (sector_count == 0)
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return 0;
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if ((ret = device_do (ctx->device_name, XDRV_GET_SECTOR_SIZE, §or_size, NULL, NULL, NULL)) <
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0)
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return 0;
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translate (sector, sector_count, FAT_SECTOR_SIZE, sector_size, &phys_sector, &phys_sector_count);
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if ((ret = device_do (ctx->device_name, XDRV_READ, &phys_sector, &phys_sector_count, buffer,
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NULL)) < 0)
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return 0;
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return 1;
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}
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static int fat_diskio_write (struct fatfs_ctx* ctx, uint32_t sector, uint8_t* buffer,
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uint32_t sector_count) {
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(void)ctx;
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int ret;
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size_t sector_size;
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size_t phys_sector, phys_sector_count;
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if (sector_count == 0)
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return 0;
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if ((ret = device_do (ctx->device_name, XDRV_GET_SECTOR_SIZE, §or_size, NULL, NULL, NULL)) <
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0)
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return 0;
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translate (sector, sector_count, FAT_SECTOR_SIZE, sector_size, &phys_sector, &phys_sector_count);
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if ((ret = device_do (ctx->device_name, XDRV_WRITE, &phys_sector, &phys_sector_count, buffer,
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NULL)) < 0)
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return 0;
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return 1;
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}
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int fat_format_drive (struct fatfs_ctx* ctx, const char* device_key, int fs_type) {
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memset (ctx, 0, sizeof (*ctx));
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memcpy (ctx->device_name, device_key, sizeof (ctx->device_name) - 1);
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size_t total_size = 0;
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device_do (device_key, XDRV_GET_SIZE, &total_size, NULL, NULL, NULL);
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if (total_size == 0)
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return -ST_NOT_FOUND;
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size_t sectors = ((total_size + FAT_SECTOR_SIZE) / FAT_SECTOR_SIZE);
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fl_init (ctx);
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ctx->_fs.disk_io.read_media = &fat_diskio_read;
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ctx->_fs.disk_io.write_media = &fat_diskio_write;
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int r = -1;
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switch (fs_type) {
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case FS_FAT16:
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r = fatfs_format_fat16 (ctx, &ctx->_fs, sectors, "mop3 fat16");
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break;
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case FS_FAT32:
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r = fatfs_format_fat32 (ctx, &ctx->_fs, sectors, "mop3 fat32");
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break;
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default:
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break;
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}
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if (r < 0)
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return -ST_FORMAT_ERROR;
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return ST_OK;
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}
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