mega8_player_v11.c

MEGA8+VS1003做的MP3

/*******************************************************************/
/*          Mega8 MP3 Player (mega8 + VS1003 + SD)  V1.6           */
/*                                                                 */
/* 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 repeat all (default),repeat 1 */
/*                    and shuffle                                  */
/*              PLAY/PAUSE:                                        */
/*              PREV: previous songs                               */
/*              NEXT: next songs                                   */
/*              UP  : volume up                                    */
/*              DOWN: volume down                                  */
/* Platform   : AVRStudio4.13 b528 + WinAVR20070122                */
/*              optimize -0s                                       */
/* Author     : bozai(Zhang Qibo)                                  */
/* E-mail     : [e-mail]                                    */
/* MSN        : [e-mail]                         */
/* Date       : 2007-05-21                                         */
/*******************************************************************/
/*  V1.7                                                           */
/*  2007-05-21                                                    */
/*  Fix a serious bug of FAT                                       */
/*  Set the default mode to "Shuffle"                              */
/*  Because the mode button is inside the box                      */
/*  So I don't want to open the box when I turn on it              */
/*  If the button is easy to press of your mp3 player              */
/*  just change the macro below to:                                */
/*            0 = repet all    1 = repet one  2 = shuffle          */

#define DEFAULT_MODE   0

/*                                                                 */
/*  V1.6                                                           */
/*  2007-05-09                                                     */
/*  And a track function to make the shuffle a real shuffle        */
/*  Due to the limted RAM space of mega8. Maximum no repetition    */
/*  songs is 1024. And songs more than that will use randomly play */
/*  Special thanks to Ronald Ausloos (Belgium)'s advice            */ 
/*                                                                 */
/*  V1.5                                                           */
/*  2007-05-03                                                     */
/*  Change the behavior of the LEDs:                               */
/*                      VS1003 faild: LED1 blink                   */
/*                      SD faild    : LED2 blink                   */
/*                      FAT faild   : LED1 & LED2 blink alternatly */
/*                      File not found: Both LED blink             */
/*  Add read capacity function, fix the bug of FAT init            */
/*  Add slow start up code of VS1003                               */ 
/*                                                                 */                                                              
/*  V1.4                                                           */
/*  2007-05-02                                                     */
/*  Add enough delay when operate VS1003                           */ 
/*                                                                 */                                                              
/*  V1.3                                                           */
/*  2007-04-21                                                     */
/*  Modify the retry time of sd reset                              */
/*  Enable some code incase that when FAT initialize               */
/*  faild program can't jump out the loop                          */
/*  so the error LED can't light up                                */
/*  And light up both leds when FAT_Ini fails                      */
/*                                                                 */
/*  V1.2:                                                          */
/*  2007-04-04:                                                    */
/*  Add a macro of path                                            */
/*                                                                 */
/*  V1.1:                                                          */
/*  2007-02-25                                                     */
/*  Change the directory to C:\music\                              */
/*  A bug fixed                                                    */
/*  Modify some code to adjust new GCC compiler                    */
/*                                                                 */
/*  V1.0:                                                          */
/*  2006-12-03:                                                    */
/*  Original Version                                               */
/*******************************************************************/

#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 uint8 unsigned char
#define uint16 unsigned int
#define uint32 unsigned long


#define PATH (unsigned char *)("\\music")
//It's the path where the file placed
//Change it if you want to placed it to anoter foler
//The path should not have blanks, and each foler name' length should less than 8 with no extention

//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 uint16 SectorsPerClust;//每簇扇区数
extern uint16 FirstDataSector;//第一个数据扇区数   //struct of file information
extern uint8  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

uint8 track[128];			//stroe the information of songs (bit set indicate songs has been played)

void ClearTrackInfo()		//cleare the array track[128]
{
	uint8 i;
	for(i=0;i<128;i++)track[i] = 0;
}

uint8 SetTrack(uint16 songs)//set the track bit, return 1 means the song has been played
{
	uint8 byte_offset;
	uint8 bit_offset;
	songs--;
	byte_offset = songs/8;
	bit_offset = songs%8;
	if(track[byte_offset] & (1<<bit_offset))return 1;
	else
	{
		track[byte_offset] |= 1<<bit_offset;
		return 0;
	}
}

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

//Timer initialization offer seed of the srandom()
void Timer1_Initial()
{
 TCNT1H=0x00;
 TCNT1L=0x00;
 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
	uint32 p;				//簇指示值			//cluster
	uint32 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
	uint32 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=DEFAULT_MODE;//单曲重复			//repet all by default
	uint16 songs_cnt = 0;					//how many songs have been played
	if(totalsongs==0)return;//如果没有歌曲则异常退出	//if no music file return
	uint32 rand_val;
	Timer1_Initial();//启动定时器，用于产生随机函数的种子	//initialize the timer
	ClearTrackInfo();
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
	{
		songs_cnt++;
		if(songs_cnt == totalsongs && totalsongs<1025)
		{
			ClearTrackInfo();
			songs_cnt = 0;
		}
		rand_val = TCNT1;
		Delay((random() && 0x00ff));
		rand_val <<= 16;
		rand_val += TCNT1;
		srandom(rand_val);
		if(totalsongs>1024)
		{
			songs = (uint16)(((random()/214749)*(uint32)totalsongs)/10000)+1;//随机产生歌曲序号	//create random song number
		}
		while(totalsongs<1025)
		{
			songs = (uint16)(((random()/214749)*(uint32)totalsongs)/10000)+1;//随机产生歌曲序号	//create random song number
			if(SetTrack(songs) == 0)break;
		}	
	}
	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(PATH,&MusicInfo,&songs,&type);		//找到相应的文件		//find the file
	p     = MusicInfo.deStartCluster+(((uint32)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;