//mian.c///////////////////////
#include "config.h"
xdata FILE TmpFile ;
void main()
{
UINT32 lba = 0;
UINT16 i;
UartInit(); //初始化串口
UartSendStr("**************************************\r\n");
UartSendStr("**************************************\r\n");
UartSendStr("**************************************\r\n");
UartSendStr("*********51MP3播放器演示程序**********\r\n");
UartSendStr("**************************************\r\n");
UartSendStr("**************************************\r\n");
UartSendStr("**************************************\r\n");
UartSendStr("**************************************\r\n");
UartSendStr("初始化SPI接口\r\n");
InitSPI(); //初始化SPI接口
UartSendStr("初始化VS1003\r\n");
RstVs1003();
UartSendStr("正弦测试\r\n");
//Sintest();
DelayMs(300);
UartSendStr("退出正弦测试\r\n");
SoftRstVs1003();
UartSendStr("初始化CH375\r\n");
InitCH375();
//初始化液晶
LCD_Init();
//显示logo
LCD_SET_CURSOR(1,1);
Print(" mp3 player ",16);
LCD_SET_CURSOR(2,1);
Print(" stuelab ",16);
SPI_HIGH_SPEED(); //高速SPI接口
UartSendStr("初始化文件系统\r\n");
InitFat (SectorBuf);
UartSendStr("统计文件信息\r\n");
i = StatFileNum(2, "MP3", SectorBuf);
sprintf(SectorBuf,"根目录下MP3文件个数为%d .\r\n",i);
UartSendStr(SectorBuf);
i = StatFileNum(2, "WMA", SectorBuf);
sprintf(SectorBuf,"根目录下WMA文件个数为%d .\r\n",i);
UartSendStr(SectorBuf);
i = StatFileNum(2, " ", SectorBuf);
sprintf(SectorBuf,"根目录下文件夹个数为%d .\r\n",i);
UartSendStr(SectorBuf);
UartSendStr("查找根目录下第一个MP3文件\r\n");
SearchFile(2, 1, "MP3", SectorBuf, &TmpFile);
UartSendStr("\r\n开始播放\r\n");
//UartSendStr(TmpFile.short_name);
lba = ClusToLba(TmpFile.start_clus);
while (1)
{
RdSDblock(lba++,SectorBuf);
PlaySector();
}
}
//spi.c////////
#include "config.h"
sbit SCK = P1^7;
sbit SO = P1^5;
sbit SI = P1^6;
void InitSPI (void)
{
SCK = 1;
SO = 1;
SI = 1;
SPCR = 0xdc+3; //主机模式,允许中断,时钟常高,4分频
ES = 0; //串口中断允许。SPI和UART共用同一个中断。
EA = 0; //中断总控位
}
void SPIsendByte (unsigned char dat)
{
SDAT = dat;
while (!(SPSR & 0x80)); //等待发送完毕
SPSR = 0; //清除中断标志
}
unsigned char SPIrecvByte (void)
{
unsigned char dat ;
SDAT = 0XFF;
while (!(SPSR & 0x80)); //等待发送完毕
SPSR = 0; //清除中断标志
dat = SDAT; //发送的过程中同时完成接收
return dat ;
//return SDAT;
}
void SPIsendByte2(unsigned char temp) //软件模拟SPI发送接口
{
char i;
for (i = 0; i < 8; i++) {
SCK = 0 ;
SO = (bit)(temp&0x80) ;
SCK = 1 ;
temp <<= 1;
}
SO = 1 ;
}
/*
unsigned SPIrecvByte2(void) //软件模拟SPI接收接口
{
char i ;
unsigned char temp;
for(i = 0; i < 8; i++) {
temp <<= 1;
SCK = 0 ;
temp = ((char)SI) | temp ;
SCK = 1 ;
}
return(temp);
} */
#include "config.h" delay.c
void DelayMs(UINT16 ticks)
{
UINT16 tmp;
while (ticks--) {
for (tmp=1000; tmp>0; tmp--);
}
}
void DelayUs(UINT16 ticks)
{
while (ticks--);
}
#include "config.h" vs1003.c
char tmp;
void SoftWrVs1003Cmd(unsigned char addr,unsigned int cmd)
{
SPCR = 0;//关闭SPI
//SCK = 1;
//SO = 1;
//SI = 1;
WaitVs1003();
SelectCmdVs1003(); //片选
DelayUs(5);
SPIsendByte2(0x02);
SPIsendByte2(addr);
SPIsendByte2((unsigned char)(cmd>>8));
SPIsendByte2((unsigned char)cmd);
DelayUs(5);
ReleaseCmdVs1003(); //释放
SPCR = 0xdf; //打开SPI
}
void WrVs1003Cmd (unsigned char addr,unsigned int cmd)
{
WaitVs1003();
SelectCmdVs1003(); //片选
DelayUs(5);
SPIsendByte(0x02);
SPIsendByte(addr);
SPIsendByte((unsigned char)(cmd>>8));
SPIsendByte((unsigned char)cmd);
DelayUs(5);
ReleaseCmdVs1003(); //释放
}
void SoftRstVs1003(void)
{
//WrVs1003Cmd(0,0x0804); //具体功能见官方数据手册第28页(软件复位)
SoftWrVs1003Cmd(0,0x0804);
DelayMs(10);
SoftWrVs1003Cmd(2,0x00f6); //低音
DelayMs(1);
SoftWrVs1003Cmd(3,0x9800); //倍频
DelayMs(10);
SoftWrVs1003Cmd(5,0xbb81); //采样率和通道数
DelayMs(1);
SoftWrVs1003Cmd(0x0b,0x2020); //音量
DelayMs(1);
}
void RstVs1003(void)
{
SelectRstVs1003(); //硬件复位
DelayMs(10);
SPIsendByte(0xff);
ReleaseRstVs1003();
DelayMs(10);
WrVs1003Cmd(0x0b,0xffff); //音量
DelayMs(1);
SoftRstVs1003();
}
/*
void Sintest(void)
{
WrVs1003Cmd(0,0x0820); //进入正弦测试
WaitVs1003();
SelectDatVs1003();
DelayUs(5);
SPIsendByte(0x53);
SPIsendByte(0xef);
SPIsendByte(0x6e);
SPIsendByte(0x30);
SPIsendByte(0);
SPIsendByte(0);
SPIsendByte(0);
SPIsendByte(0);
DelayUs(5);
ReleaseDatVs1003();
}
*/
void PlaySector(void)
{
UINT16 i ;
SelectDatVs1003();
for (i=0; i<512;) {//连续发32个字节(VS1003有32字节的缓冲区)
WaitVs1003(); // 查忙
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
SPIsendByte(SectorBuf[i++]);
}
ReleaseDatVs1003();
}
//定义CH375.c////
#include "config.h"
#include
#include
//#include //串口驱动函数
/* 定义CH375命令代码及返回状态 */
#include "CH375INC.H"
/* CH375特性 */
#define CH375_BLOCK_SIZE 64 /* CH375 maximum data block size */
#define CH375_BLK_PER_SEC 8 /* CH375 block per sector, SECTOR_SIZE/CH375_BLOCK_SIZE */
/* 以下定义适用于MCS-51单片机,其它单片机参照修改,为了提供C语言的速度需要对本程序进行优化 */
#include
unsigned char volatile xdata CH375_CMD_PORT _at_ 0xff04; /* CH375命令端口的I/O地址 */
unsigned char volatile xdata CH375_DAT_PORT _at_ 0xfe04; /* CH375数据端口的I/O地址 */
unsigned char xdata DATA_BUFFER[512] _at_ 0x0000; /* 外部RAM数据缓冲区的起始地址,长度不少于一次读写的数据长度 */
sbit CH375_INT_WIRE = 0xA0^5; /* P3.2, INT0, 连接CH375的INT#引脚,用于查询中断状态 */
/* 在P1.4连接一个LED用于监控演示程序的进度,低电平LED亮,当U盘插入后亮 */
sbit P1_4 = P1^4;
#define LED_OUT_ACT( ) { P1_4 = 0; } /* P1.4 低电平驱动LED显示 */
#define LED_OUT_INACT( ) { P1_4 = 1; } /* P1.4 低电平驱动LED显示 */
/* 延时2微秒,不精确 */
void delay2us( )
{
unsigned char i;
for ( i = 2; i != 0; i -- );
}
/* 延时1微秒,不精确 */
void delay1us( )
{
unsigned char i;
for ( i = 1; i != 0; i -- );
}
/* 延时100毫秒,不精确 */
void mDelay100mS( )
{
unsigned char i, j, c;
for ( i = 200; i != 0; i -- ) for ( j = 200; j != 0; j -- ) c+=3;
}
/* 基本操作 */
void CH375_WR_CMD_PORT( unsigned char cmd ) { /* 向CH375的命令端口写入命令,周期不小于4uS,如果单片机较快则延时 */
delay2us();
CH375_CMD_PORT=cmd;
delay2us();
}
void CH375_WR_DAT_PORT( unsigned char dat ) { /* 向CH375的数据端口写入数据,周期不小于1.5uS,如果单片机较快则延时 */
CH375_DAT_PORT=dat;
delay1us(); /* 因为MCS51单片机较慢所以实际上无需延时 */
}
unsigned char CH375_RD_DAT_PORT() { /* 从CH375的数据端口读出数据,周期不小于1.5uS,如果单片机较快则延时 */
delay1us(); /* 因为MCS51单片机较慢所以实际上无需延时 */
return( CH375_DAT_PORT );
}
/* 等待CH375中断并获取状态 */
unsigned char mWaitInterrupt() { /* 主机端等待操作完成, 返回操作状态 */
while( CH375_INT_WIRE ); /* 查询等待CH375操作完成中断(INT#低电平) */
CH375_WR_CMD_PORT( CMD_GET_STATUS ); /* 产生操作完成中断, 获取中断状态 */
return( CH375_RD_DAT_PORT( ) );
/* c = CH375_RD_DAT_PORT( ); 返回中断状态 */
/* if ( c == USB_INT_DISCONNECT ) ?; 检测到USB设备断开事件 */
/* else if ( c == USB_INT_CONNECT ) ?; 检测到USB设备连接事件 */
}
/* 设置CH375为USB主机方式 */
unsigned char mCH375Init( )
{
unsigned char i;
#ifdef TEST_CH375_PORT
unsigned char c;
CH375_WR_CMD_PORT( CMD_CHECK_EXIST ); /* 测试工作状态 */
CH375_WR_DAT_PORT( 0x55 ); /* 测试数据 */
c = CH375_RD_DAT_PORT( ); /* 返回数据应该是测试数据取反 */
if ( c != 0xaa ) { /* CH375出错 */
for ( i = 100; i != 0; i -- ) { /* 强制数据同步 */
CH375_WR_CMD_PORT( CMD_RESET_ALL ); /* CH375执行硬件复位 */
c = CH375_RD_DAT_PORT( ); /* 延时 */
}
mDelay100mS( ); /* 延时至少30mS */
}
#end if
CH375_WR_CMD_PORT( CMD_SET_USB_MODE ); /* 设置USB工作模式 */
CH375_WR_DAT_PORT( 6 ); /* 模式代码,自动检测USB设备连接 */
for ( i = 0xff; i != 0; i -- ) /* 等待操作成功,通常需要等待10uS-20uS */
if ( CH375_RD_DAT_PORT( ) == CMD_RET_SUCCESS ) break; /* 操作成功 */
if ( i != 0 ) return( 0 ); /* 操作成功 */
else return( 0xff ); /* CH375出错,例如芯片型号错或者处于串口方式或者不支持 */
}
/* 初始化磁盘 */
unsigned char mInitDisk( )
{
unsigned char mIntStatus;
CH375_WR_CMD_PORT( CMD_GET_STATUS ); /* 产生操作完成中断, 获取中断状态 */
mIntStatus = CH375_RD_DAT_PORT( );
if ( mIntStatus == USB_INT_DISCONNECT ) return( mIntStatus ); /* USB设备断开 */
CH375_WR_CMD_PORT( CMD_DISK_INIT ); /* 初始化USB存储器 */
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
if ( mIntStatus != USB_INT_SUCCESS ) return( mIntStatus ); /* 出现错误 */
CH375_WR_CMD_PORT( CMD_DISK_SIZE ); /* 获取USB存储器的容量 */
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
if ( mIntStatus != USB_INT_SUCCESS ) { /* 出错重试 */
mDelay100mS( );
CH375_WR_CMD_PORT( CMD_DISK_SIZE ); /* 获取USB存储器的容量 */
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
}
if ( mIntStatus != USB_INT_SUCCESS ) return( mIntStatus ); /* 出现错误 */
/* 可以由CMD_RD_USB_DATA命令将容量数据读出 */
return( 0 ); /* U盘已经成功初始化 */
}
/* 从U盘读取多个扇区的数据块到缓冲区 */
unsigned char mReadSector( unsigned long iLbaStart, unsigned char iSectorCount )
/* iLbaStart 是准备读取的线性起始扇区号, iSectorCount 是准备读取的扇区数 */
{
unsigned char mIntStatus;
unsigned char *mBufferPoint;
unsigned int mBlockCount;
unsigned char mLength;
CH375_WR_CMD_PORT( CMD_DISK_READ ); /* 从USB存储器读数据块 */
CH375_WR_DAT_PORT( (unsigned char)iLbaStart ); /* LBA的最低8位 */
CH375_WR_DAT_PORT( (unsigned char)( iLbaStart >> 8 ) );
CH375_WR_DAT_PORT( (unsigned char)( iLbaStart >> 16 ) );
CH375_WR_DAT_PORT( (unsigned char)( iLbaStart >> 24 ) ); /* LBA的最高8位 */
CH375_WR_DAT_PORT( iSectorCount ); /* 扇区数 */
mBufferPoint = DATA_BUFFER; /* 指向缓冲区起始地址 */
for ( mBlockCount = iSectorCount * CH375_BLK_PER_SEC; mBlockCount != 0; mBlockCount -- ) /* 数据块计数 */
{
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
if ( mIntStatus == USB_INT_DISK_READ ) /* USB存储器读数据块,请求数据读出 */
{
CH375_WR_CMD_PORT( CMD_RD_USB_DATA ); /* 从CH375缓冲区读取数据块 */
mLength = CH375_RD_DAT_PORT( ); /* 后续数据的长度 */
while ( mLength ) /* 根据长度读取数据 */
{
SBUF = CH375_RD_DAT_PORT( );
while(!TI) ;
TI = 0 ;
//*mBufferPoint = CH375_RD_DAT_PORT( ); /* 读出数据并保存 */
//mBufferPoint ++;
mLength --;
delay2us( );
}
CH375_WR_CMD_PORT( CMD_DISK_RD_GO ); /* 继续执行USB存储器的读操作 */
}
else break; /* 返回错误状态 */
}
if ( mBlockCount == 0 ) {
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
if ( mIntStatus == USB_INT_SUCCESS ) return( 0 ); /* 操作成功 */
}
return( mIntStatus ); /* 操作失败 */
}
struct _HD_MBR_DPT
{
unsigned char PartState;
unsigned char StartHead;
unsigned int StartSec;
unsigned char PartType;
unsigned char EndHead;
unsigned int EndSec;
unsigned long StartSector;
unsigned long TotalSector;
};
/* 为printf和getkey输入输出初始化串口 */
void mInitSTDIO( )
{
//定时器1工作在模式2,8Bit自动重装载模式
TMOD = (TMOD & 0X0F) | 0X21;
SCON = 0x50;
PCON |= 0x80;//波特率翻倍
TH1 = 0xff;
TL1 = 0xff; //12M晶振,12T模式,波特率为115200
TR1 =1;
TI = 1;
}
main( )
{
unsigned char c, mIntStatus;
mInitSTDIO( );
LED_OUT_ACT( ); /* 开机后LED亮一下以示工作 */
mDelay100mS( ); /* 延时100毫秒 */
LED_OUT_INACT( );
printf( "Start\n" );
c = mCH375Init( ); /* 初始化CH375 */
if ( c )
{
printf( "Error @CH375Init\n" );
}
printf( "Insert USB disk\n" );
do /* 等待U盘连接 */
{
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
}
while ( mIntStatus != USB_INT_CONNECT ); /* U盘没有连接或者已经拔出 */
mDelay100mS( ); /* 延时等待U盘进入正常工作状态 */
mDelay100mS( );
printf( "InitDisk\n" );
c = mInitDisk( ); /* 初始化U盘,实际是识别U盘的类型,不影响U盘中的数据,在所有读写操作之前必须进行此步骤 */
if ( c )
{
printf( "Error @InitDisk, %02X\n", c );
}
LED_OUT_ACT( );
/* 检查U盘是否准备好,大多数U盘不需要这一步,但是某些U盘必须要执行这一步才能工作 */
// do {
// mDelay100mS( );
// printf( "Disk Ready ?\n" );
// i = CH375DiskReady( ); /* 查询磁盘是否准备好,如果省掉这个子程序可以节约将近1KB的程序代码 */
// } while ( i != ERR_SUCCESS );
/* CH375DiskReady 在CH375的U盘文件子程序库中,因为代码较多,所以此处省去 */
printf( "ReadSector 0# to buffer\n" );
c = mReadSector(4110, 1 );
/*if ( c ) printf( "Error @ReadSector, %02X\n", c );
if ( DATA_BUFFER[0x01FF] == 0xAA ) { /* 磁盘分区有效 */
/*printf( "WriteSector 1# from buffer\n" );
c = mWriteSector( 1, 1 );
if ( c ) printf( "Error @WriteSector, %02X\n", c );
memset( DATA_BUFFER, 0, 512 ); /* 清空数据缓冲区,代替原来的分区信息 */
/*printf( "WriteSector 0# for clear\n" );
c = mWriteSector( 0, 1 );
if ( c ) printf( "Error @WriteSector, %02X\n", c );
}
else {
printf( "ReadSector 1# to buffer\n" );
c = mReadSector( 1, 1 );
if ( c ) printf( "Error @ReadSector, %02X\n", c );
printf( "WriteSector 0# from buffer\n" );
c = mWriteSector( 0, 1 );
if ( c ) printf( "Error @WriteSector, %02X\n", c );
}*/
printf( "Stop\n" );
while ( 1 )
{
mIntStatus = mWaitInterrupt( ); /* 等待中断并获取状态 */
if ( mIntStatus == USB_INT_DISCONNECT ) /* U盘没有连接或者已经拔出 */
{
printf( "Out\n" );
LED_OUT_INACT( );
}
else if ( mIntStatus == USB_INT_CONNECT ) /* U盘已经连接 */
{
printf( "In\n" );
LED_OUT_ACT( );
}
}
}
#include "config.h" uart.c
void UartInit (void)
{
//参数配置
#define MCLK 22118400L //定义CPU主频(Hz)
#define BAUD_RATE 19200L //设置波特率
RXD = 1;
TXD = 1;
SCON = 0x50; //串口方式1(8位Uart),允许接收
PCON |= 0x80; //波特率加倍
TMOD &= 0x0F;
TMOD |= 0x20;
TH1 = 256 - ( MCLK / 12 ) / ( 16 * BAUD_RATE );
TL1 = TH1; //设置波特率
TR1 = 1;
//ES = 1; //允许串行口中断
//EA = 1; //允许中断
}
void UartSendByte (unsigned char dat)
{
SBUF = dat;
while(!TI);
TI = 0;
}
void UartSendStr(char *str)
{
while (*str != '\0'){
UartSendByte(*str);
str++ ;
}
}
#include "config.h" lcd.c
delay(unsigned char time)
{
while(--time);
}
//LCD状态检测,根据最高位判断LCD是否忙
unsigned char LCD_BUSY(void)
{
delay(20);//Protues仿真环境下必须延时
if((bit)(LCD_CR & 0x80)) return (1);
else return (0);
}
//将要显示的字符写入LCD
void Print(unsigned char *str,unsigned char n){
unsigned char i;
for(i=0;i100) //按键时间超过一秒,长按键码
{
// key=key_old+0x80; //长按键码等于普通按键码加0x80
}
else if(key_pressed_time>1)
{
key=key_old; //按键值
}
key_old=0;
}
return;
}
else //按键按下
{
key_new=0;
if(BEGIN_KEY)key_new=KEY_BEGIN; //BEGIN键按下
if(DOWN_KEY)key_new=KEY_DOWN; //DOWN键按下
if(UP_KEY)key_new=KEY_UP; //UP键按下
if(VOL DOWN_KEY)key_new=KEY_DOWN; //VOL DOWN键按下
if(VOL UP_KEY)key_new=KEY_UP; //VOL UP键按下
if(key_new==key_old) //如果按键按下长于10ms
{
if(key_pressed_time>80) //如果按键按下超过1s
{
key_pressed_time-=5; //则自动按键。相当于每隔50ms按一次
key=key_new;
return;
}
else
{
key_pressed_time++; //按键按下计时加一
}
}
else
{
key_pressed_time=0; //如果本次按下跟上次按下不一样,则按键按下时间清零
}
key_old=key_new; //保存本次按键值
}
}
//fat.c
#include "config.h"
unsigned long int DosBootSector; //操作系统引导扇区
unsigned char SectorPerClus; //每簇扇区数(一般很小,2-64)
unsigned long int FatStartSector; //FAT表开始扇区
unsigned long int DataStartSector; //数据开始扇区
/*读主引导******master boot record********/
void RdMBR (unsigned char *buf)
{
READ_SECTOR(0, buf);
DosBootSector = buf[454]
+ buf[455]*256
+ buf[456]*65536
+ buf[457]*65536*256;
}
/****读操作系统引导记录扇区***dos boot recode************/
void RdDBR (unsigned char *buf)
{
idata unsigned long int fat_size ; //文件分配表的大小
idata unsigned long int reserved_sector ;
READ_SECTOR(DosBootSector,buf);
SectorPerClus = buf[13] ; //每簇扇区数
reserved_sector = buf[14] ; //保留扇区,一般为32,但有的不是,所以读出
fat_size = buf[36]
+ buf[37]*256
+ buf[38]*65536
+ buf[39]*65536*256;
fat_size = fat_size * 2;
FatStartSector = DosBootSector + reserved_sector;
DataStartSector = FatStartSector + fat_size ;
}
//簇号转为逻辑扇区号
unsigned long int ClusToLba (unsigned long int clus) //ok
{
return (unsigned long int)((clus-2) * (unsigned long int)SectorPerClus + DataStartSector);
}
//通过当前簇,查找下一簇
unsigned long int SearchNextClus (unsigned long int this_clus, unsigned char *buf)
{
unsigned long int fat_offset ;
unsigned char offset ;
fat_offset = this_clus/128 ; //每扇区存放128个FAT项
offset = this_clus % 128 ;
READ_SECTOR(FatStartSector + fat_offset, buf);
if (buf[4 * offset + 3] == 0X0F ) return 0 ; //the end
return (unsigned long int)( buf[4*offset]
+ buf[4*offset+1]*256
+ buf[4*offset+2]*65536
+ buf[4*offset+3]*65536*256);
}
//
void InitFat (unsigned char *buf)
{
RdMBR(buf); //读主引导扇区
RdDBR(buf); //读操作系统引导扇区,获取该分区文件系统信息
sprintf(buf,"the DosBootSector = %ld . \r\n",DosBootSector);
UartSendStr(buf);
sprintf(buf,"the SectorPerClus = %ld . \r\n",(unsigned long int)SectorPerClus);
UartSendStr(buf);
sprintf(buf,"the FatStartSector = %ld . \r\n",FatStartSector);
UartSendStr(buf);
sprintf(buf,"the DataStartSector = %ld . \r\n",DataStartSector);
UartSendStr(buf);
}
#include "config.h" file.c
//查找以index为索引的文件
unsigned char SearchFile (unsigned long int entry,
unsigned int index,
char *type,
unsigned char *buf,
FILE *pfile)
{
unsigned char i ;
unsigned int file_num = 0 ;
unsigned char sector_count = 0;
unsigned char *pdir;
unsigned char dir_count;
unsigned long int addr = ClusToLba(entry);
while (1)
{
if(sector_count++ < SectorPerClus) {
READ_SECTOR(addr++, buf);
} else {
SearchNextClus(entry++, buf);
addr = ClusToLba(entry);
sector_count = 1 ;
READ_SECTOR(addr++, buf);
}
for (dir_count = 0; dir_count < 16; dir_count++) //每扇区有16个目录项
{
pdir = &buf[dir_count*32];
if (pdir[0] == 0) { //结束,未找到
return 0 ;
} else if ((pdir[0] != 0xe5) && //未删除
(pdir[8] == type[0]) &&
(pdir[9] == type[1]) &&
(pdir[10] == type[2])) {
if (++file_num == index) { //找到文件
for (i = 0; i < 11; i++) { // copy short name
pfile -> short_name[i] = pdir[i];
}
pfile -> short_name[11] = '\0';
pfile -> attr = pdir[11] ; //属性字节
pfile -> start_clus = pdir[20]*65536
+ pdir[21]*256*65536
+ pdir[26] + pdir[27]*256;
pfile -> size = pdir[30]*65536 + pdir[31]*256*65536
+ pdir[28] + pdir[29]*256;
UartSendStr("file has found !\r\n");
UartSendStr(pfile -> short_name);
}
}
}
}
}
//查找某一个目录下指定文件的个数
unsigned int StatFileNum (unsigned long int entry, //入口簇
char *type, //查找类型
unsigned char *buf) //扇区缓冲区
{
idata unsigned int file_num = 0 ;
idata unsigned char sector_count = 0;
unsigned char *pdir;
idata unsigned char dir_count;
idata unsigned long int addr = ClusToLba(entry);
while (1)
{
if(sector_count++ < SectorPerClus) {
READ_SECTOR(addr++, buf);
} else {
SearchNextClus(entry++, buf);
addr = ClusToLba(entry);
sector_count = 1 ;
READ_SECTOR(addr++, buf);
}
for (dir_count = 0; dir_count < 16; dir_count++) //每扇区有16个目录项
{
pdir = &buf[dir_count*32];
if (pdir[0] == 0) { //查找结束,返回文件个数
return file_num;
} else if ((pdir[0] != 0xe5) && //未删除
(pdir[8] == type[0]) &&
(pdir[9] == type[1]) &&
(pdir[10] == type[2])) {
file_num++; //找到文件
continue ;
}
}
}
}
文档已经阅读完毕,请返回上一页!