Matthias Blankertz
d39157ba0a
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- Old SDSC cards could have a native blocksize != 512 bytes, but they should support the SET_BLOCKLEN command to set the blocksize to 512. Use that so we can just assume 512 everywhere else. - SDSC cards used byte addresses, not sector numbers, for the argument of READ_BLOCK and WRITE_BLOCK. Check the card type and multiply the sector number with 512 if necessary. Tested with a noname chinese 128 MiB-ish card. Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
27 lines
812 B
C
27 lines
812 B
C
#pragma once
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#define SD_SECTOR_SIZE 512
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struct sd_context {
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size_t blocks;
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size_t blocksize;
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bool initialized;
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bool old_card;
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bool sdhc_sdxc;
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};
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bool sd_init(struct sd_context *context, int mosi, int miso, int sck, int ss, int rate);
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bool sd_deinit(struct sd_context *sd_context);
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bool sd_readblock(struct sd_context *context, size_t sector_num, uint8_t buffer[static SD_SECTOR_SIZE]);
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bool sd_readblock_start(struct sd_context *context, size_t sector_num, uint8_t buffer[static SD_SECTOR_SIZE]);
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bool sd_readblock_complete(struct sd_context *context);
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bool sd_readblock_is_complete(struct sd_context *context);
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bool sd_writeblock(struct sd_context *context, size_t sector_num, uint8_t buffer[const static SD_SECTOR_SIZE]);
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