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IDE_DIOR=1;<br>
}<br>
IDE_Address=IDE_Bus_Not_Use;<br>
set_IDE_address();<br>
IDE_DATA_L=0xFF;<br>
}<br>
///////////////////////////////////////////////////////////////////////////////////////////////<br>
<br>
unsigned int play_count; //当前文件夹中播放曲号<br>
<br>
///////////////////////////////////// 获取磁盘信息 /////////////////////////////////////////<br>
void get_IDE_information(void)<br>
{<br>
unsigned int i;<br>
unsigned int j;<br>
unsigned int k;<br>
unsigned long int LBA=0;<br>
mp3_file_exist=0;<br>
LBA=0;<br>
read_IDE_sector(LBA);<br>
for(i=0;i<4;i++)<br>
{<br>
dpt[i].file_system_type=buffer[0x1C2+i*16]; //文件系统类型<br>
((unsigned char
*)&(dpt[i].start_sector))[3]=buffer[0x1C6+i*16];<br>
((unsigned char
*)&(dpt[i].start_sector))[2]=buffer[0x1C7+i*16];<br>
((unsigned char
*)&(dpt[i].start_sector))[1]=buffer[0x1C8+i*16];<br>
((unsigned char
*)&(dpt[i].start_sector))[0]=buffer[0x1C9+i*16]; //分区开始扇区<br>
((unsigned char
*)&(dpt[i].total_sectors))[3]=buffer[0x1CA+i*16];<br>
((unsigned char
*)&(dpt[i].total_sectors))[2]=buffer[0x1CB+i*16];<br>
((unsigned char
*)&(dpt[i].total_sectors))[1]=buffer[0x1CC+i*16];<br>
((unsigned char
*)&(dpt[i].total_sectors))[0]=buffer[0x1CD+i*16]; //分区总扇区<br>
}<br>
<br>
if((buffer[510]!=0x55)||(buffer[511]!=0xAA))disk_error=1;<br>
LBA=dpt[0].start_sector; //C盘<br>
read_IDE_sector(LBA);<br>
DISK_CAPACITY[7]=buffer[0x0B];<br>
DISK_CAPACITY[6]=buffer[0x0C]; //分区容量<br>
((unsigned char
*)&(dbr[0].bytes_per_sectors))[0]=buffer[0x0C];<br>
((unsigned char
*)&(dbr[0].bytes_per_sectors))[1]=buffer[0x0B]; //每扇区字节数<br>
dbr[0].sectors_per_cluster=buffer[0x0D]; //每簇扇区数<br>
((unsigned char
*)&(dbr[0].reserve_sectors))[1]=buffer[0x0E];<br>
((unsigned char
*)&(dbr[0].reserve_sectors))[0]=buffer[0x0F]; //保留扇区数<br>
dbr[0].num_of_FAT=buffer[0x10]; //FAT副本数<br>
((unsigned char *)&(dbr[0].FAT16_ROOT_num))[1]=buffer[0x11];<br>
((unsigned char *)&(dbr[0].FAT16_ROOT_num))[0]=buffer[0x12]; //FAT16文件系统的根目录数<br>
((unsigned char *)&(dbr[0].small_sectors))[1]=buffer[0x13];<br>
((unsigned char *)&(dbr[0].small_sectors))[0]=buffer[0x14];<br>
((unsigned char
*)&(dbr[0].sectors_per_FAT16))[1]=buffer[0x16];<br>
((unsigned char
*)&(dbr[0].sectors_per_FAT16))[0]=buffer[0x17];<br>
((unsigned char *)&(dbr[0].hidden_sectors))[3]=buffer[0x1C];<br>
((unsigned char *)&(dbr[0].hidden_sectors))[2]=buffer[0x1D];<br>
((unsigned char *)&(dbr[0].hidden_sectors))[1]=buffer[0x1E];<br>
((unsigned char *)&(dbr[0].hidden_sectors))[0]=buffer[0x1F];<br>
((unsigned char *)&(dbr[0].large_sectors))[3]=buffer[0x20];<br>
((unsigned char *)&(dbr[0].large_sectors))[2]=buffer[0x21];<br>
((unsigned char *)&(dbr[0].large_sectors))[1]=buffer[0x22];<br>
((unsigned char *)&(dbr[0].large_sectors))[0]=buffer[0x23];<br>
((unsigned char
*)&(dbr[0].sectors_per_FAT32))[3]=buffer[0x24];<br>
((unsigned char
*)&(dbr[0].sectors_per_FAT32))[2]=buffer[0x25];<br>
((unsigned char
*)&(dbr[0].sectors_per_FAT32))[1]=buffer[0x26];<br>
((unsigned char
*)&(dbr[0].sectors_per_FAT32))[0]=buffer[0x27];<br>
((unsigned char
*)&(dbr[0].root_cluster_num))[3]=buffer[0x2C];<br>
((unsigned char
*)&(dbr[0].root_cluster_num))[2]=buffer[0x2D];<br>
((unsigned char
*)&(dbr[0].root_cluster_num))[1]=buffer[0x2E];<br>
((unsigned char
*)&(dbr[0].root_cluster_num))[0]=buffer[0x2F];<br>
if((buffer[510]!=0x55)||(buffer[511]!=0xAA))disk_error=2;<br>
FAT_start_sector[0]=dpt[0].start_sector+dbr[0].reserve_sectors;<br>
DATA_start_sector[0]=FAT_start_sector[0]+(dbr[0].num_of_FAT)*(dbr[0].sectors_per_FAT32);<br>
LBA=DATA_start_sector[0];<br>
driver_number=C_;<br>
current_dir.first_cluster_number=dbr[0].root_cluster_num;<br>
for(i=0;i<dbr[0].sectors_per_cluster;i++) //扫描C盘根目录，是否有MP3文件<br>
{<br>
read_IDE_sector(LBA);<br>
for(j=0;j<512/32;j++)<br>
{<br>
for(k=0;k<11;k++)file.name[k]=buffer[j*32+k];<br>
file.attribute=buffer[j*32+11];<br>
((unsigned char
*)&(file.first_cluster_number))[0]=buffer[j*32+0x15];<br>
((unsigned char
*)&(file.first_cluster_number))[1]=buffer[j*32+0x14];<br>
((unsigned char
*)&(file.first_cluster_number))[2]=buffer[j*32+0x1B];<br>
((unsigned char
*)&(file.first_cluster_number))[3]=buffer[j*32+0x1A];<br>
((unsigned char
*)&(file.length))[3]=buffer[j*32+0x1C];<br>
((unsigned char
*)&(file.length))[2]=buffer[j*32+0x1D];<br>
((unsigned char
*)&(file.length))[1]=buffer[j*32+0x1E];<br>
((unsigned char
*)&(file.length))[0]=buffer[j*32+0x1F];<br>
file.next_cluster_number=file.first_cluster_number;<br>
if(is_a_mp3_file())<br>
{<br>
mp3_file_exist=1;<br>
play_count++;<br>
if(play_count==3)return;<br>
}<br>
}<br>
LBA++;<br>
}<br>
}<br>
////////////////////////////////////////////////////////////////////////////////////////////////////////////<br>
<br>
/*void read_IDE_buffer(void)<br>
{<br>
write_IDE_command(IDE_Read_Buffer);<br>
}*/<br>
<br>
/*void write_IDE_buffer(void)<br>
{<br>
write_IDE_command(IDE_Write_Buffer);<br>
}*/<br>
<br>
<br>
/*void write_IDE_sector(void)<br>
{<br>
write_IDE_command(IDE_Write_Sectors);<br>
}*/<br>
<br>
///////////////////////////////////////////// IDE
初始化 /////////////////////////////////////////<br>
void IDE_initial(void)<br>
{<br>
reset_IDE();<br>
do<br>
{<br>
write_IDE_8(IDE_Drive_Head,0xE0);<br>
read_IDE_status();<br>
}while(IDE_BSY);<br>
wait_IDE_busy();<br>
write_IDE_8(IDE_Device_Control,0xFA);//没有中断模式f<br>
get_IDE_information();<br>
}<br>
///////////////////////////////////////////////////////////////////////////////////////////////////////<br>
<br>
<br>
/*file_system.c file<br>
Created by Computer-lov Date: 2005.3.19<br>
Copyright (c) 2005 Computer-lov<br>
version 1.0<br>
*/<br>
<br>
#include "file_system.h"<br>
#include "IDE.H"<br>
#include "hardware.h"<br>
//#include "USB_mass_storage.h"<br>
<br>
FILE xdata file;<br>
<br>
//////////////////////////////////// 判断是否为一个
MP3 文件 ///////////////////////////////<br>
unsigned char is_a_mp3_file(void)<br>
{<br>
if((file.name[0]==0x00)||(file.name[0]==0xE5)||(file.name[0]=='.'))return
0;<br>
if(file.attribute==0x0F)return 0; //此项目为长文件名项目<br>
if(file.attribute & 0x04)return 0; //此文件为系统文件<br>
if(file.attribute & 0x08)return 0; //此项目为系统标卷<br>
if(file.attribute & 0x10)return 0; //此项目为子目录<br>
if((file.name[8]=='M')&&(file.name[9]=='P')&&(file.name[10]=='3'))return
1;<br>
else return 0;<br>
}<br>
///////////////////////////////////////////////////////////////////////////////////////////////<br>
<br>
unsigned long int LAST_FAT_LBA;<br>
//最后一次读取FAT时的逻辑块地址，用来判断本次读取是否需要重新从硬盘中读取，以加快速度<br>
<br>
////////////////////////////////////////////////////////////////////////////////////////////////<br>
unsigned long int get_next_sector(void) //根据当前簇号，获取下一个扇区地址<br>
{<br>
unsigned long int LBA;<br>
unsigned int i;<br>
LBA=(file.next_cluster_number)/((dbr[driver_number].bytes_per_sectors)/4); //计算扇区地址<br>
i=(file.next_cluster_number)*4-LBA*dbr[driver_number].bytes_per_sectors;
//计算偏移地址<br>
if(LAST_FAT_LBA!=LBA) //如果数据不在FAT_buffer[]中，则需要重新读取<br>
{<br>
LAST_FAT_LBA=LBA;<br>
LBA=LBA+FAT_start_sector[driver_number];<br>
read_IDE_FAT_sector(LBA);<br>
}<br>
((unsigned char
*)&(file.next_cluster_number))[3]=FAT_buffer[i];<br>
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