76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#include <drivers/flash.h>
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#include <storage/flash_map.h>
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#include <sys/crc.h>
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#include "ens_fs.h"
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#define SEED 42
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int ens_fs_init(ens_fs_t* fs, uint8_t id, uint64_t entry_size) {
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int rc = flash_area_open(id, &fs->area);
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if (rc) {
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return rc;
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}
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const struct device* dev = flash_area_get_device(fs->area);
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fs->sector_count = flash_get_page_count(dev);
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struct flash_pages_info info;
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rc = flash_get_page_info_by_offs(dev, fs->area->fa_off, &info);
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fs->sector_size = info.size;
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fs->entry_size = entry_size;
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return 0;
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}
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int ens_fs_read(ens_fs_t* fs, uint64_t id, void* dist) {
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uint64_t offset = id * fs->entry_size;
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int rc = flash_area_read(fs->area, offset, dist, fs->entry_size);
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if(rc) {
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goto end;
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}
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// TODO lome: Read deleted flag and CRC
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end:
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return rc;
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}
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int ens_fs_write(ens_fs_t* fs, uint64_t id, void* data) {
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// Set CRC and not-deleted-flag
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uint8_t* obj = data;
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obj[fs->entry_size - 1] = crc7_be(SEED, obj, fs->entry_size - 1) | 1;
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uint64_t offset = id * fs->entry_size;
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int rc = flash_area_write(fs->area, offset, data, fs->entry_size);
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if(rc) {
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goto end;
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}
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end:
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return rc;
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}
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int ens_fs_delete(ens_fs_t* fs, uint64_t id) {
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// TODO lome: Maybe overwrite last 4 bytes? Or make it file system dependend?
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// uint8_t data = 0;
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// uint64_t offset = (id + 1) * fs->entry_size - 1;
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// int rc = flash_area_write(fs->area, offset, &data, 0);
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// if(rc) {
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// goto end;
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// }
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return 0;
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}
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int ens_fs_page_erase(ens_fs_t* fs, uint64_t offset, uint64_t sector_count) {
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uint64_t start = (offset - offset % fs->sector_size) * fs->entry_size;
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int rc = flash_area_erase(fs->area, start, fs->sector_size * sector_count);
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return rc;
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}
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