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28 lines
845 B
C
28 lines
845 B
C
#pragma once
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#include <common/sys/types.h>
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/**
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* @brief 根据簇号计算该簇的起始扇区号（LBA地址）
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*
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* @param first_data_sector 数据区的其实扇区号
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* @param sec_per_clus 每个簇的扇区数量
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* @param cluster 簇号
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* @return uint32_t LBA地址
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*/
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static inline uint32_t __fat32_calculate_LBA(uint32_t first_data_sector, uint32_t sec_per_clus, uint32_t cluster)
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{
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return first_data_sector + (cluster - 2) * sec_per_clus;
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}
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/**
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* @brief 计算LBA地址所在的簇
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*
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* @param first_data_sector 数据区的其实扇区号
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* @param sec_per_clus 每个簇的扇区数量
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* @param LBA LBA地址
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* @return uint32_t 所在的簇
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*/
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static inline uint32_t __fat32_LBA_to_cluster(uint32_t first_data_sector, uint32_t sec_per_clus, uint32_t LBA)
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{
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return ((LBA - first_data_sector) / sec_per_clus) + 2;
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} |