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.
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
#include <conio.h>
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#include <string.h>
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#include "fat.h"
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#include "sd_card.h"
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uint8_t fat_buf[512];
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static full_bpb_t bpb;
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static uint32_t data_region_start;
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void fat_print_pbp_info(ebpb_t* epbp){
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cprintf("Bytes per sector: %d\n", epbp->bpb3.bpb2.bytes_per_sector);
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cprintf("Sectors per cluster: %d\n", epbp->bpb3.bpb2.sectors_per_cluster);
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cprintf("Reserved Sectors: %d\n", epbp->bpb3.bpb2.reserved_sectors);
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cprintf("Fat Count: %d\n", epbp->bpb3.bpb2.fat_count);
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cprintf("Max Dir Entries: %d\n", epbp->bpb3.bpb2.max_dir_entries);
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cprintf("Total Sector Count: %d\n", epbp->bpb3.bpb2.total_sector_count);
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cprintf("Media Descriptor: 0x%x\n", epbp->bpb3.bpb2.media_descriptor);
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cprintf("Sectors per Fat: %d\n", epbp->bpb3.bpb2.sectors_per_fat);
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cprintf("\n");
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cprintf("Sectors per track: %d\n", epbp->bpb3.sectors_per_track);
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cprintf("Head Count: %d\n", epbp->bpb3.head_count);
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cprintf("Hidden Sector Count: %ld\n", epbp->bpb3.hidden_sector_count);
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cprintf("Logical Sector Count: %ld\n", epbp->bpb3.logical_sector_count);
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cprintf("Sectors per Fat: %ld\n", epbp->bpb3.sectors_per_fat);
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cprintf("Extended Flags: 0x%x\n", epbp->bpb3.extended_flags);
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cprintf("Version: %d\n", epbp->bpb3.version);
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cprintf("Root Cluster: 0x%lx\n", epbp->bpb3.root_cluster);
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cprintf("System Information: 0x%x\n", epbp->bpb3.system_information);
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cprintf("Backup Boot Sector: 0x%x\n", epbp->bpb3.backup_boot_sector);
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cprintf("\n");
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cprintf("Drive Number: %d\n", epbp->drive_num);
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cprintf("Extended Signature: 0x%x\n", epbp->extended_signature);
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cprintf("Volume ID: 0x%lx\n", epbp->volume_id);
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cprintf("Partition Label: %.11s\n", &epbp->partition_label);
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cprintf("Partition Label: %.8s\n", &epbp->filesystem_type);
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cprintf("\n");
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}
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void fat_init(){
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sd_readblock(0, fat_buf);
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memcpy(&bpb, &fat_buf[11], sizeof(ebpb_t));
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sd_readblock(1, fat_buf);
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sd_readblock(32, fat_buf);
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data_region_start = bpb.reserved_sectors + bpb.fat_count*bpb.sectors_per_fat_32;
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}
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void fat_read(char* filename, void* buf) {
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vfat_dentry_t* vfat_dentry;
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dos_dentry_t* dos_dentry;
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uint32_t cluster;
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(void)filename; //just ignore filename
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sd_readblock(data_region_start, buf);
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vfat_dentry = (vfat_dentry_t*)buf;
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while(vfat_dentry->sequence_number == 0xe5)
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vfat_dentry++;
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dos_dentry = (dos_dentry_t*)(vfat_dentry + 1);
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cluster = ((uint32_t)dos_dentry->first_cluster_h << 16) + dos_dentry->first_cluster_l;
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sd_readblock(data_region_start + (cluster - 2) * 8, buf);
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} |