f1e71a9461
All of the SD card commands are moved into their own file, with functions sd_init, sd_get_rca, sd_select_card, sd_get_status, and sd_readblock. The FAT functions are movied into fat.c and give functions fat_init and fat_read. Note that the filename is ignored for now, it always reads the first file in the root directory. The loading of o65 files is done in o65.c, and executing is done in exec.c This cleans up the main file signifigantly and leaves the project open to expansion.
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
#ifndef _FAT_H
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#define _FAT_H
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#include <stdint.h>
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extern uint8_t fat_buf[];
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typedef struct {
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uint16_t bytes_per_sector;
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uint8_t sectors_per_cluster;
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uint16_t reserved_sectors;
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uint8_t fat_count;
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uint16_t max_dir_entries;
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uint16_t total_sector_count;
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uint8_t media_descriptor;
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uint16_t sectors_per_fat;
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} dos_2_bpb_t;
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typedef struct {
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dos_2_bpb_t bpb2;
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uint16_t sectors_per_track;
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uint16_t head_count;
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uint32_t hidden_sector_count;
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uint32_t logical_sector_count;
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uint32_t sectors_per_fat;
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uint16_t extended_flags;
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uint16_t version;
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uint32_t root_cluster;
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uint16_t system_information;
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uint16_t backup_boot_sector;
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uint8_t reserved[12];
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} dos_3_bpb_t;
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typedef struct {
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dos_3_bpb_t bpb3;
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uint8_t drive_num;
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uint8_t reserved;
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uint8_t extended_signature;
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uint32_t volume_id;
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uint8_t partition_label[11];
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uint8_t filesystem_type[8];
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} ebpb_t;
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typedef struct {
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uint16_t bytes_per_sector;
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uint8_t sectors_per_cluster;
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uint16_t reserved_sectors;
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uint8_t fat_count;
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uint16_t max_dir_entries;
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uint16_t total_sector_count;
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uint8_t media_descriptor;
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uint16_t sectors_per_fat_16;
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uint16_t sectors_per_track;
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uint16_t head_count;
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uint32_t hidden_sector_count;
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uint32_t logical_sector_count;
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uint32_t sectors_per_fat_32;
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uint16_t extended_flags;
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uint16_t version;
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uint32_t root_cluster;
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uint16_t system_information;
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uint16_t backup_boot_sector;
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uint8_t reserved[12];
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uint8_t drive_num;
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uint8_t reserved2;
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uint8_t extended_signature;
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uint32_t volume_id;
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uint8_t partition_label[11];
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uint8_t filesystem_type[8];
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} full_bpb_t;
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typedef struct {
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uint32_t sig;
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uint8_t reserved[480];
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uint32_t sig2;
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uint32_t free_data_clusters;
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uint32_t last_allocated_data_cluster;
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uint32_t reserved2;
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uint32_t sig3;
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} fs_info_sector_t;
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typedef struct {
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uint8_t sequence_number;
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uint16_t filename0[5];
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uint8_t attributes;
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uint8_t type;
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uint8_t checksum;
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uint16_t filename1[6];
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uint16_t reserved;
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uint16_t filename[2];
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} vfat_dentry_t;
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typedef struct {
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uint8_t filename[8];
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uint8_t extension[3];
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uint8_t attributes;
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uint8_t reserved;
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uint8_t create_time_10ms;
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uint32_t create_date;
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uint16_t access_date;
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uint16_t first_cluster_h;
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uint32_t modify_cluster;
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uint16_t first_cluster_l;
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uint32_t file_size;
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} dos_dentry_t;
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void fat_print_pbp_info(ebpb_t* epbp);
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void fat_init();
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void fat_read(char* filename, void* buf);
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#endif |