m8单片机做得mp3程序.c

用单片机+SD卡+VS1003实现MP3

M8_VS1003_SD卡做的MP3播放器
  对Bozai（章其波）表示感谢。
复制内容到剪贴板代码:
/*******************************************************************/
/*             MP3/Wma/Midi播放器                   */
/*  功能：播放文件系统为FAT16/32的SD卡根目录下的MP3/Wma/Mid文件   */
/*      有五个按键分别为 暂停/播放 模式 上一首 下一首 音量+ 音量-*/
/*  环境WinAVR 20060421                              */
/*  作者：Bozai（章其波）                            */
/*  E-mail：[email][e-mail][/email]                           */
/*  2006年12月13日                                 */
/*******************************************************************/
/*       MiniMP3 Player (mega8 + VS1003 + SD)  V1.1         */
/*                                            */
/* Discription: Can play mp3/wma/wav/mid SF0 files in the root    */
/*          directery on the SD card which file system is FAT16*/
/*          or FAT32.                            */
/*          It has six keys to control this player         */
/*          MODE: switch between repet all (default),repet one */
/*              and shuffle                       */
/*          PLAY/PAUSE:                           */
/*          PREV: previous songs                     */
/*          NEXT: next songs                        */
/*          UP  : volume up                        */
/*          DOWN: volume down                       */
/* Platform  : AVRStudio4.13 524 + WinAVR20070122            */
/*          optimize -0s                          */
/* Author    : bozai(Zhang Qibo)                       */
/* E-mail    : [email][e-mail][/email]                        */
/* MSN      : [email][e-mail][/email]                 */
/* Date     : 2007-02-25                            */
/*******************************************************************/

/*  Last modify: 2007-02-25        */
/*  Change the directory to C:\music\  */
/*  A bug fixed                */
/*  Modify some code to adjust new GCC compiler*/

#include<avr/io.h>
#include"MMC_SD/MMC_SD.h" //head files
#include"FAT/FAT.h"
#include"VS1003B/VS1003B.h"
#include<avr/pgmspace.h>

#define uint unsigned int

//diagnose and state indicate leds
//at start up this two led indicate error
//at normal they indicate the state of the MODE 
#define LED1_CON() DDRC|=_BV(PC5)
#define LED1_ON()  PORTC|=_BV(PC5)
#define LED1_OFF() PORTC&=~_BV(PC5)

#define LED2_CON() DDRB|=_BV(PB1)
#define LED2_ON()  PORTB|=_BV(PB1)
#define LED2_OFF() PORTB&=~_BV(PB1)

//keys
#define STOP _BV(PD2)
#define MODE _BV(PD3)
#define NEXT _BV(PD7)
#define UP  _BV(PD4)
#define DOWN _BV(PD6)
#define PREV _BV(PD5)

#define MP3 1
#define WMA 2
#define MID 3

//mode
#define REPET_ALL 0
#define REPET_ONE 1
#define RANDOM   2

extern WORD SectorsPerClust;//每簇扇区数
extern WORD FirstDataSector;//第一个数据扇区数  //struct of file information
extern BYTE FAT32_Enable;

struct FileInfoStruct FileInfo;//文件信息

struct direntry MusicInfo;  //要播放的mp3文件信息    //the mp3 file item whichi will be played
uint16 totalsongs;      //总的音乐文件数目      //total songs in the root directery on the SD card
uint8 type;          //文件类型          //file type


void Delay(uint16 n)//延时
{
  while(n--)asm("nop");
}

//Timer initialization offer seed of the srandom()
void Timer1_Initial()
{
TCNT1H=0x00;
TCNT1L=0x00;
TCCR1A=0x03;//ctc mode  use icr1
TCCR1B=0x01;//system clock;
ICR1H=0xff;
ICR1L=0xff;
}

void PlayMusicwithKey()//播放音乐函数，一旦执行不会退出
{
  uint16 keylen;      //用于键处理    //for key processing
  uint16 count;      //数据计数      //data counting
  uint8 i;        //循环变量      //loop variable
  uint16 j;        //循环变量      //loop variable
  DWORD p;        //簇指示值      //cluster
  DWORD totalsect;    //文件拥有的扇区数  //cotain the total sector number of a file
  uint16 leftbytes;    //剩余字节      //cotain the left bytes number of a file //the last cluster usually not fully occupied by the file
  uint8 *buffer;      //缓冲        //buffer
  DWORD sector;      //扇区        //recor the current sector to judge the end sector
  uint8 flag;        //播放/暂停标志    //flag of pause
  uint16 vol=DefaultVolume;//初始音量，应与vs1003函数里的初始音量相同  //default volume
  uint16 songs=1;      //默认放第一首歌  //play the fist songs by default
  uint8 mode=0;      //单曲重复      //repet all by default
  if(totalsongs==0)return;//如果没有歌曲则异常退出  //if no music file return
  unsigned long rand_val;
  Timer1_Initial();//启动定时器，用于产生随机函数的种子  //initialize the timer
next://下一首歌的起始地方            //label for "goto"
  if(mode==RANDOM)//随机播放歌曲         //if the mode is shuffle the songs
  {
    rand_val = TCNT1;
    Delay((random() && 0x00ff));
    rand_val <<= 16;
    rand_val += TCNT1;
    srandom(rand_val);
    songs = (unsigned int)(((random()/214749)*(unsigned long)totalsongs)/10000)+1;//随机产生歌曲序号  //create random song number
  }
  count=0;//清基数  //clear count
  flag=1;
  while(count<2048 && (type != MID))//recommand 2048 zeros honoring DREQ befor soft reset
  {                  //用于从wma跳出到下一首歌，和一首歌结束填充数据//midi格式不需要
    if((VS1003B_PIN & _BV(VS1003B_DREQ))!=0)
    {
      for(j=0;j<32;j++)
      {
        VS1003B_WriteDAT(0x00);//填充0  //fill 0
        count++;
      }
      if(count == 2047)break;
    }
  }
  VS1003B_SoftReset();//soft reset //in case of playing wma files//软件复位
  Search("\\music",&MusicInfo,&songs,&type);    //找到相应的文件    //find the file
  p    = MusicInfo.deStartCluster+(((unsigned long)MusicInfo.deHighClust)<<16);//读文件首簇  //the first cluster of the file
    
  totalsect = MusicInfo.deFileSize/512; //计算扇区数      //calculate the total sectors
  leftbytes = MusicInfo.deFileSize%512; //计算剩余的字节数  //calculate the left bytes  
  i=0;
  sector=0;
  
  while(1)
  {
    keylen=0;
     for(;i<SectorsPerClust;i++)    //一个簇  //a cluster
    {
      buffer=malloc(512);
      FAT_LoadPartCluster(p,i,buffer);//读一个扇区  //read a sector
      count=0;
      while(count<512)
      {
        if(flag==0){if(keylen){Delay(100);keylen--;}}
        else if(type == MID){if(keylen){Delay(100);keylen--;}}
        if((VS1003B_PIN & _BV(VS1003B_DREQ))!=0 && flag)  //根据需要送数据  //send data  honoring DREQ
        {
          for(j=0;j<32;j++)      //每次送32个数据    //32 Bytes each time
          {
            VS1003B_WriteDAT(buffer[count]);
            count++;
          }
          if(keylen)keylen--;      //用于键处理      //for key processing
          if(sector == totalsect && count >= leftbytes)    //如果文件已结束    //if this is the end of the file
          {
            if(type == MID)//waiting the midi file was decoded
            {//对于mid音乐要接着送2048个零
              count=0;
              while(count<2048)//recommand 2048 zeros honoring DREQ goto next songs
              {
                if((VS1003B_PIN & _BV(VS1003B_DREQ))!=0 )
                {
                  for(j=0;j<32;j++)
                  {
                    VS1003B_WriteDAT(0x00);
                    count++;
                  }
                  if(count == 2047)break;
                }
              }
            }
            i=SectorsPerClust;
            break;
          }//文件结束      //file ended
          if(count == 511){break;}//512字节送完跳出    //break if a sector was sent
        }
        if((PIND&STOP)==0 /*&& keylen==0*/)//播放暂停键    //key PLAY/PAUSE
         {
            Delay(100);
          if(!(PIND&STOP))
          {
            while(!(PIND&STOP));
             if(flag)flag=0;
             else flag=1;
             Delay(1000);
           }
         }
        else if(!(PIND&DOWN) && keylen==0)  //音量-      //Volume down
         {
           Delay(100);
             if(!(PIND&DOWN))  
          {
          keylen=200;
            vol=vol+((uint)(1<<8)+1);
            if(vol>=0xFEFE) vol=0xFEFE; 
               else VS1003B_WriteCMD(0x0b,vol);
           }
          }
         else if(!(PIND&UP) && keylen==0) //音量+      //Volume up
          {
           Delay(100);
            if(!(PIND&UP)) 
           {
           keylen=200;
            vol=vol-((uint)(1<<8)+1);
            if(vol<=0x0101) vol=0x0101;
            else VS1003B_WriteCMD(0x0b,vol);
              }
          }
         else if(!(PIND&NEXT)) //下一首            next songs
          {
          Delay(0x7fff);    
          if(!(PIND&NEXT))
          {
            Delay(0x7fff);
            if(!(PIND&NEXT))
            {
              while(!(PIND&NEXT));
              songs++;
              if(songs > totalsongs)songs=1;
              {
                free(buffer);
              //  Delay(0xffff);
                goto next;
              }
            }
          }
          }
         else if(!(PIND&PREV)) //上一首            previous songs
          {
          Delay(0x7fff);    
          if(!(PIND&PREV))
          {
            Delay(0x7fff);
            if(!(PIND&PREV))
            {
              while(!(PIND&PREV));
              if(songs == 1)songs=totalsongs;
              else songs--;
              {
                free(buffer);
              //  Delay(0xffff);
                goto next;
              }
            }
          }
          }
         else if((!(PIND&MODE)) && keylen==0) //模式      //mode key
          {
          Delay(100);    
          if(!(PIND&MODE))
          {
            keylen=0xffff;
            if(mode==REPET_ALL)
            {
              mode=REPET_ONE;
              LED1_ON();
              LED2_OFF();
            }
            else if(mode==REPET_ONE)//next mode is shuffle
            {
              mode=RANDOM;
              LED1_OFF();
              LED2_ON();
              srandom(((unsigned long)TCNT1)<<16);//产生随机数的种子
            }
            else 
            {
              mode=REPET_ALL;
              LED1_OFF();
              LED2_OFF();
            }
          }
          }
      }
      sector++;
      free(buffer);
    }
    i=0;
    p=FAT_NextCluster(p);//读下一簇数据      //read next cluster
    if(p == 0x0fffffff || p == 0x0ffffff8 || (FAT32_Enable == 0 && p == 0xffff))//如果无后续簇则结束，  //no more cluster
    {
        if(mode==REPET_ALL)songs++;
        if(songs>totalsongs)songs=1;
        goto next;
    }
  }
}

//main function
int main()
{
  DDRD &= 0x03;//初始化端口
  PORTD |= 0xfc;
  
  LED1_CON();
  LED1_OFF();
  LED2_CON();
  LED2_OFF();


  OSCCAL = 0x00;//最小RC振荡频率  //in order to operate some low speed card the initialization should run at lowest speed

  Delay(0xffff);

  MMC_SD_Init();//初始化spi口    //SPI initialize

  Delay(0xffff);

  if(VS1003B_Init())LED1_ON();//配置VS1003  //config vs1003

  Delay(0xffff);//提供足够的延时        //supply enough delay
  Delay(0xffff);
  Delay(0xffff);
  Delay(0xffff);
  Delay(0xffff);

  MMC_SD_Reset();//初始化SD卡          //sd card initialize

  OSCCAL = 0xff;//最大RC振荡频率        //normal operation maximum the frequency

  Delay(0xffff);                //wait for stable

  if(FAT_Init())LED2_ON();//初始化文件系统 支持FAT16和FAT32  //initialize file system  FAT16 and FAT32 are supported

  Search("\\music",&MusicInfo,&totalsongs,&type);//搜索根目下的歌曲 不包含子目录
  //也可以指定文件夹 如Search("\\new\\mp3",&MusicInfo,&totalsongs,&type);
  //代表在根目录下的new文件夹下的mp3文件下的音乐文件

  //search the songs in the root directery on the SD card
  //You can also specify the directery where the songs are placed
  //eg: Search("\\new\\mp3",&MusicInfo,&totalsongs,&type);
  //    means search the file in the foler C:\new

  PlayMusicwithKey();//播放歌曲    //play songs
  return 0;
}