49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
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#ifndef UF2FORMAT_H
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#define UF2FORMAT_H 1
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#include <stdint.h>
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#include <stdbool.h>
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// All entries are little endian.
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// if you increase that, you will also need to update the linker script file
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#define APP_START_ADDRESS 0x00002000
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#define UF2_MAGIC_START0 0x0A324655UL // "UF2\n"
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#define UF2_MAGIC_START1 0x9E5D5157UL // Randomly selected
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#define UF2_MAGIC_END 0x0AB16F30UL // Ditto
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// If set, the block is "comment" and should not be flashed to the device
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#define UF2_FLAG_NOFLASH 0x00000001
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#define UF2_FLAG_FILE 0x00001000
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#define UF2_FILENAME_MAX 150
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#define UF2_MAX_PAYLOAD (476 - 10) // leaving some space for filename
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// for this bootloader
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#define UF2_MAX_FILESIZE (64 * 1024 * 1024)
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typedef struct {
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// 32 byte header
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uint32_t magicStart0;
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uint32_t magicStart1;
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uint32_t flags;
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uint32_t targetAddr;
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uint32_t payloadSize;
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uint32_t blockNo;
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uint32_t numBlocks;
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uint32_t fileSize;
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// raw data, followed by filename (NUL-terminated) at payloadSize
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uint8_t data[476];
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// store magic also at the end to limit damage from partial block reads
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uint32_t magicEnd;
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} UF2_Block;
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static inline bool is_uf2_block(void *data) {
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UF2_Block *bl = (UF2_Block *)data;
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return bl->magicStart0 == UF2_MAGIC_START0 && bl->magicStart1 == UF2_MAGIC_START1 &&
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bl->magicEnd == UF2_MAGIC_END;
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}
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#endif
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