📄 mp3-at89c51.c
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#include "AT89C51SND1_REG.H"
#include "MCU_KEYPAD.H"
#include "MP3_PLAYER.H"
#include "FILE_SYS.H"
void main()
{
void main()
{
//MP3 Player
/*初始化*/
MP3player_Init(); //解码器初始化
Mutestate(1);//初始化为声状态
P1 = 0x0f;
KBCON = 0x00;
IEN1 |=EKB; //按键初始化
EA = 1; //中断使能
/*获得曲目数量*/
Number_Song = GetMP3NUM();
/*处理播放曲目程序*/
Playingflag= 0;
while(1) //循环
{
if(Number_Song != 0)//如果存在MP3文件
{
PlayInit(&SONG[11 * Playingflag]);
Mutestate(0);//有声模式
PlayMP3(&SONG[11 * Playingflag]);//播放指定MP3文件
Mutestate(1);
}
if(Playingflag ==Number_Song)//循环播放
{
Playingflag= 0;
}
}
}
}
}
//-----------------------------------------------------------------------
void MP3player_Init(void)
{
MP3VOR = 0x0a;//右声道控制寄存器
MP3VOL = 0x0a;//左声道音量控制寄存器
MP3BAS = 0x10;//低音控制寄存器
MP3MED = 0x10;//媒介控制寄存器
MP3TRE = 0x10;
MP3CON &= (~MSKREQ); //Clear to allow the
//MPREQ flag to generate a MP3 interrupt.
MP3CON |= MPEN; //使能MP3解码.
}
//------------------------------------------------------------------------
void Mutestate(unsigned char sw)
{
static char volume;
if(sw)
{
volume = MP3VOL;
MP3VOR = 0x00;
MP3VOL = 0x00;
AUDCON1 &= (~0x01);
MP3CON &= (~MPEN);
}
else
{
MP3VOR = volume;
MP3VOL = volume;
AUDCON1 |= 0x01;
MP3CON |= MPEN;
}
}
//---------------------------------------------------------------------------
unsigned char GetMP3NUM(void)
{
unsigned char i = 0, j = 0, l = 0;
int k = 0;
unsigned char MP3[3] = {'M', 'P', '3'};
GetFATInfo();
k = BootSector + RsdSector + 2 * SectorofFatSize;
ReadPage(k / 32, k % 32, Page_Buf);
while (Page_Buf[0] != 0)
{
for (j=0; j<16; j++)
{
if (!Page_Buf[j * 32]) break;
if (Page_Buf[j * 32] == 0xE5) continue;
if (!memcmp(MP3, &Page_Buf[j * 32 + 8], 3))
{
for (i=0; i<11; i++)
{
SONG[l * 11 + i] = Page_Buf[j * 32 + i];
}
l++;
}
}
k++;
ReadPage(0 + k / 32, k % 32, Page_Buf);
}
return l;
}
//----------------------------------------------------------------------
void GetFATInfo(void)
{
ReadPage(Begin_Cluster, 0, Page_Buf);
if (!(Page_Buf[0] == 0xeb && Page_Buf[2] == 0x90))
{
BootSector = Page_Buf[454] + Page_Buf[455] * 256 + Page_Buf[456] * (256 * 256) + Page_Buf[457] * (256 * 256 * 256);
}
else
{
BootSector = 0;
}
ReadPage(Begin_Cluster, BootSector, Page_Buf);
RsdSector = Page_Buf[14] + Page_Buf[15] * 256;
SecPerClus = Page_Buf[13];
BytesPerSec = Page_Buf[12] * 256 + Page_Buf[11];
TotalSector = (Page_Buf[20] * 256 + Page_Buf[19]);
TotalCapacity = TotalSector * BytesPerSec;
TotalCluster = TotalSector / SecPerClus;
SectorofFatSize = ((Page_Buf[22] + Page_Buf[23] * 256));
RootEntry = (Page_Buf[18] * 256 + Page_Buf[17]);
FirstDataSec = BootSector + RsdSector + (SectorofFatSize * 2) + ((RootEntry * 32 + (BytesPerSec-1)) / BytesPerSec);
if (TotalCluster > 65525)
{
FAT_TYPE = FAT32;
if (TotalSector == 0)
{
TotalSector = (Page_Buf[32] + Page_Buf[33] * 256 + Page_Buf[34] * 256 * 256 + Page_Buf[35] * 256 * 256 * 256);
}
TotalCapacity = TotalSector * BytesPerSec;
TotalCluster = TotalSector / SecPerClus;
SectorofFatSize = (Page_Buf[36] + Page_Buf[37] * 256 + Page_Buf[38] * 256 * 256 + Page_Buf[39] * 256 * 256 * 256);
if (SectorofFatSize > (TotalCluster * 16 / 512))
{
SectorofFatSize = ((Page_Buf[22] + Page_Buf[23] * 256));
}
RootEntry = (Page_Buf[44] * 256 + Page_Buf[43]);
FirstDataSec = BootSector+RsdSector + (SectorofFatSize * 2) + ((RootEntry * 32 + (BytesPerSec-1)) / BytesPerSec);
}
else if ((TotalCluster > 0) && (TotalCluster < 4085))
{
FAT_TYPE = FAT12;
}
else
{
FAT_TYPE = FAT16;
}
}
//-------------------------------------------------------
char PlayInit(unsigned char *SongName)
{
int i = 0, j = 0, f = 0;
int k = 0;
unsigned int total_size;
RDCOUNT = Read_Sector(SongName, Page_Buf);
/*判断ID3V2*/
if (Page_Buf[0] == 0x49)
if ((Page_Buf[1] == 0x44) && (Page_Buf[2] == 0x33))
{
/*获得MP3标签长度*/
total_size = (Page_Buf[6] & 0x7F) * 0x200000 + (Page_Buf[7] & 0x7F) * 0x4000 + (Page_Buf[8] & 0x7F) * 0x80 + (Page_Buf[9] & 0x7F);
while (total_size > 512)
{
Read_Sector(SongName, Page_Buf);
total_size -=512;
}
i = total_size;
}
/*MP3帧头*/
if (Page_Buf[i] != 0xFF)i += 10;
/*获得MP3文件的信息*/
if ((Page_Buf[i] == 0xFF) && (Page_Buf[i + 1] & 0xF0 == 0xF0))
{
MP3_Framehead[0] = Page_Buf[i];
MP3_Framehead[1] = Page_Buf[i + 1];
MP3_Framehead[2] = Page_Buf[i + 2];
MP3_Framehead[3] = Page_Buf[i + 3];
}
/*设置MP3解码器和AUDIO接口的时钟*/
if (MP3_Framehead[1] & 0x08)
{
switch ((MP3_Framehead[2] & 0x0C) >> 2)
{
case 0x00 : MP3FsInit(24, 126, 3, 5); break; //Fs=44.1kHz
case 0x01 : MP3FsInit(124, 575, 3, 4); break; //Fs=48kHz
case 0x02 : MP3FsInit(124, 511, 3, 9); AUDCON0 = 0x76; break;//Fs=32kHz
default : break;
}
}
else
{
switch ((MP3_Framehead[2] & 0x0C) >> 2)
{
case 0x00 : MP3FsInit(24, 126, 3, 11); break; //Fs=22.05kHz
case 0x01 : MP3FsInit(124, 575, 3, 9); break; //Fs=24kHz
case 0x02 : MP3FsInit(124, 511, 3, 19); AUDCON0 = 0x76; break; //Fs=16kHz
default : break;
}
}
DataRead = 0;
return 1;
}
//-------------------------------------------------------------------------------
int ReadSector(unsigned char *Name, unsigned char *databuff)
{
int i, k, Page;
unsigned long CurrentSector;
if (DataRead == 0)
{
Page = BootSector + RsdSector + 2 * SectorofFatSize;//文件目录表地址
ReadPage(Page / 32, Page % 32, databuff); //读取文件目录表内容
while (databuff[0] != 0)//文件目录表有内容
{
for (i=0; i<16; i++)
{
if (!memcmp(Name, &databuff[i * 32], 11))//比较文件名
{
//获得文件所在簇号
Current_Cluster = databuff[32 * i + 27] * 256 + databuff[32 * i + 26];
for (k=31; k>27; k--)
{
DataRemain = (DataRemain << 8) | databuff[i * 32 + k];
}
//文件所在逻辑扇区号
CurrentSector = (Current_Cluster - 2) * SecPerClus + FirstDataSec;
//读取一个扇区的文件内容
ReadPage(CurrentSector / 32, CurrentSector % 32, databuff);
DataRead += 512;
DataRemain -= 512;
if (DataRemain < 0)
{
DataRead = 0;
return (DataRemain + 512);
}
else
{
return (512);
}
}
}
Page++;
ReadPage(0 + Page / 32, Page % 32, databuff);
}
return (0);
}
else
{
Current_Cluster++;
CurrentSector = (Current_Cluster - 2) * SecPerClus + FirstDataSec;
ReadPage(CurrentSector / 32, CurrentSector % 32, databuff);
DataRead += 512;
DataRemain -= 512;
if (DataRemain < 0)
{
DataRead = 0;
return (DataRemain + 512);
}
else return (512);
}
}
//-----------------------------------------------------------------
void PlayMP3(unsigned char *SongName)
{
int i =0,m =0;
while (1)
{
RDCOUNT = ReadSector(SongName, Page_Buf);
for (i=0; i<RDCOUNT; i++)
{
while (!(MP3STA1 & MPBREQ))
while (!PlayState);
MP3DAT = Page_Buf[i];
}
if (ChangeSong)
{
DataRead = 0;
ChangeSong = 0;
m =1;
}
if (RDCOUNT < 512)
{
NowPlaying++;
MP3InitFlag = 1;
m =1;
}
if(m)
{
while(MP3STA1 & MPFREQ)
MP3DAT = 0x00;
return;
}
}
}
//-------------------------------------------------
void key_interrupt() interrupt 11
{
unsigned char i,j,k;
/*屏蔽MP3中断*/
EA = 0;
IEN1 &= (～EKB);
k=KBSTA & 0x0f;
for(j=0;j<10;j++)
for(i=0;i<100;i++);
if(k==(～P1 & 0x0f))
/*中断任务处理*/
switch (k)
{
case 1 : Func(); break; //
case 2 : Next(); break;
case 4 : Previous(); break;
case 8 : PlayPause(); break;//播放暂停
default : break;
}
/*使能MP3中断*/
IEN1 |= EKB;
EA = 1;
k=KBSTA;
return;
}
void Func()
{
if (function < 3)
{
function++;
}
else if (function == 3)
{
function = 1;
}
}
void Next()
{
switch (function)
{
case SELECT_MP3 :
if (Playing == (number_mp3 - 1))
Playing = 0;
else
Playing++;
MP3InitFlag = 1;
ChangeSong = 1;
break;
case VOLUME :
if (MP3VOR > 0x00)
{
MP3VOR -= 0x01;
MP3VOL -= 0x01;
}
break;
case EFFECT :
if (MP3BAS > 2)
{
MP3BAS -= 2;
MP3TRE += 2;
}
break;
default: break;
}
}
void Previous()
{
switch (function)
{
case SELECT_MP3 :
if (Playing > 0)
Playing--;
else
Playing = number_mp3 - 1;
MP3InitFlag = 1;
ChangeSong = 1;
break;
case VOLUME :
if (MP3VOR < 0x1f)
{
MP3VOR += 0x01;
MP3VOL += 0x01;
}
break;
case EFFECT:
if (MP3BAS < 0x1e)
{
MP3BAS += 2;
MP3TRE -= 2;
}
break;
default: break;
}
}
void PlayPause()
{
PlayState = !PlayState;
player_state(!PlayState);
}
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