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本帖最后由 dash1982 于 2013-8-18 21:21 编辑
最初是照着《VS1003+SD卡播放MP3文件》这个帖子来做MP3播放器的，但按照该帖制作出来的播放器只能识别FAT16分区的SD卡，而且很挑卡（比如无法识别使用卡槽转换的TF卡/小卡）; 对于码流过高的mp3文件，会有“咔咔”的爆音(click noise)出现。
在原帖的基础上，参考相关资料，做出来下面的播放器雏形，主要功能如下：
1. 320kbps的mp3解码无压力，更高的就没试过了。
2. 支持FAT16/FAT32的SD卡（不挑小卡大卡）。
3. 自动扫描SD卡目录并生成播放列表。
4. SD卡有新拷贝MP3文件时，自动更新播放列表。
硬件：
我的板子是Arduino nano w/ATmega328， 淘宝上38块钱的货。VS1003模块和SD模块也都是淘宝上买来的现成模块。程序跑起来后还能剩下大概600字节的RAM，便于后续添加更多的功能。
连线图参考《VS1003+SD卡播放MP3文件》 这个帖子就可以。SD卡片选线可能会不同，修改ino文件的第659行：
- if (!sd.begin(4, SPI_FULL_SPEED)) sd.initErrorHalt();
把4改成你自己的片选线即可
软件：
ino文件在arduino1.0.5 编译、运行均无问题， 操作系统是ArchLinux。其他系统/IDE版本未验证
依赖于SdFat库，下载地址在:
https://code.google.com/p/sdfatlib/downloads/list
我下载的版本是
sdfatlib20130629.zip
下载完毕后直接拷到Arduino的library目录即可。其他版本未验证。
注：SdFat代码挂在code.google上，由于某邮笑长FBX的缘故，可能需要借助于翻/墙才能顺利下载。
局限、注意事项和未来可能的改进
1. 扫描SD卡目录我设置成了最多扫描4级目录，埋藏太深的目录会被跳过。这是因为在扫描目录时使用的是自己写的函数，使用的递归层数太多会导致内存的耗尽。未来可以应该通过对SdFat库的修改来突破这个限制。
2. SD的片选线是4，如果你的片选不是4，需要修改ino文件的第659行
3. 可能是由于nano板供电的原因，我的VS1003模块在外接大功率音箱时偶尔会不响，用耳机无此问题。
4. 运行此程序后会在SD卡根目录自动生成"PL_OK.TXT"和"PLT.TXT"两个文件，PL_OK.TXT记录着MP3文件的目录结构，而PLT.TXT是生成供程序使用的实际播放文件。
5. 文件太多时，初次运行生成播放文件可能要比较耗时。
6. 后续工作的一些想法： 增加控制按钮(音量调节、挑歌)，增加随机播放，支持录音，支持WMA播放，支持红外控制等等。
[pre lang="arduino" line="1" file="mp3player.ino"]/*
* This sketch will list all files in the root directory and
* then do a recursive list of all directories on the SD card.
* Only the mp3 files will be listed in the original playlist.
* Then we use original Playlist to generate the actual Playlist.
* Then feeding VS1003 with the bytes read from the mp3 file.
*
*/
#include <SdFat.h>
#include <SdFatUtil.h>
#include <SdFile.h>
#include <SPI.h>
// SD FileSystem Object
SdFat sd;
SdFile file; // General Operating file
short songnumbers = 0; // songs in SD Card
short open_count = 0; // open_count is for holding the opencounts in genOrigListFile()
short totalsongs = 0; // totalsongs in playlist.
// Variable for holding the latest timestamp
uint16_t latestWriteTime = 0;
uint16_t latestWriteDate = 0;
/* VS1003 Part */
//set vs1003 pins
short xCs=9;
short xReset=8;
short dreq= 7;
short xDcs=6;
// Vs1003 Reset, for Initialize the vs1003
void Mp3Reset(){
int volume = 0x30;
digitalWrite(xReset,LOW);
delay(100);
digitalWrite(xCs,HIGH);
digitalWrite(xDcs,HIGH);
digitalWrite(xReset,HIGH);
commad(0X00,0X08,0X04); //Write into the MODE
delay(10);
if(digitalRead(dreq) == HIGH)
{
commad(0X03,0XC0,0X00);//Set the clock of VS1003
delay(10);
commad(0X05,0XBB,0X81);//Set VS1003 to 44kps Sterero
delay(10);
commad(0X02,0X00,0X55);//Set the heavy sound
delay(10);
commad(0X0B,volume,volume);//highest volume:0x0000, lowest volume:0xFEFE
delay(10);
SPI.transfer(0);
SPI.transfer(0);
SPI.transfer(0);
SPI.transfer(0);
digitalWrite(xCs,HIGH);
digitalWrite(xReset,HIGH);
digitalWrite(xDcs,HIGH);
digitalWrite(4,LOW);
}
}
// for sending SPI commands
void commad(unsigned char addr,unsigned char hdat,unsigned char ldat)
{
if(digitalRead(dreq)==HIGH)
{
digitalWrite(xCs,LOW);
SPI.transfer(0X02);
SPI.transfer(addr);
SPI.transfer(hdat);
SPI.transfer(ldat);
digitalWrite(xCs,HIGH);
}
}
//PlayMP3 pulls 32 byte chunks from the SD card and throws them at the VS1003
//We monitor the DREQ (data request pin). If it goes low then we determine if
//we need new data or not. If yes, pull new from SD card. Then throw the data
//at the VS1003 until it is full.
void playMP3(char* fileName)
{
//Open the file in read mode.
if (!file.open(fileName, O_READ))
{
Serial.print("Failed to Open:");
Serial.println(fileName);
return;
}
Serial.println("Track open");
//Buffer of 32 bytes. VS1053 can take 32 bytes at a go.
uint8_t mp3DataBuffer[32];
//track.read(mp3DataBuffer, sizeof(mp3DataBuffer)); //Read the first 32 bytes of the song
uint8_t need_data = 0;
Serial.println("Start MP3 decoding");
while(1)
{
while(!digitalRead(dreq))
{
//DREQ is low while the receive buffer is full
//You can do something else here, the buffer of the MP3 is full and happy.
//Maybe set the volume or test to see how much we can delay before we hear audible glitches
//If the MP3 IC is happy, but we need to read new data from the SD, now is a great time to do so
if(need_data == 0)
{
//Try reading 32 new bytes of the song
if(!file.read(mp3DataBuffer, sizeof(mp3DataBuffer)))
{
//Try reading 32 new bytes of the song
//Oh no! There is no data left to read!
//Time to exit
break;
}
need_data = 1;
}
}
//This is here in case we haven't had any free time to load new data
if(need_data == 0)
{
//Go out to SD card and try reading 32 new bytes of the song
if(!file.read(mp3DataBuffer, sizeof(mp3DataBuffer)))
{
//Oh no! There is no data left to read!
//Time to exit
break;
}
need_data = 1;
}
//Once DREQ is released (high) we now feed 32 bytes of data to the VS1053 from our SD read buffer
digitalWrite(xDcs, LOW); //Select Data
for(int y = 0 ; y < sizeof(mp3DataBuffer) ; y++)
{
SPI.transfer(mp3DataBuffer[y]); // Send SPI byte
}
digitalWrite(xDcs, HIGH); //Deselect Data
//We've just dumped 32 bytes into VS1053 so our SD read buffer is empty. Set flag so we go get more data
need_data = 0;
}
//Wait for DREQ to go high indicating transfer is complete
while(!digitalRead(dreq));
//Deselect Data
digitalWrite(xDcs, HIGH);
//Close out this track
file.close();
Serial.print("Track ");
Serial.print(fileName);
Serial.println(" done!");
}
//***************************************************************
// SD Card Operation Functions Start
//***************************************************************
/* This function is for get all of the songs in SD card */
/* return value: how many mp3 files in the SD Card */
short getSongsinSD(SdBaseFile * dir, int numTabs) {
// entry is for recording the file information
SdFile entry;
// length is 8(filename)+1(.)+3(suffix)+1(NUL) == 13
char filename[13];
// open Next item, until the end of the world.
while(entry.openNext(dir, O_READ)) {
// If this entry is a sub-directory, go to sub directories to get numbers.
if(entry.isSubDir())
{
// Get the current index, use this index for recursively print the sub-directories
uint16_t index = dir->curPosition()/32 -1;
SdBaseFile s;
if(s.open(dir, index, O_READ))
{
if(numTabs <=2)
{
getSongsinSD(&s, numTabs + 1);
}
}
entry.close();
}
else // Common files will directly be displayed.
{
// Calculate how many MP3 exists in SD card.
entry.getFilename(filename);
if((filename[strlen(filename)-3] == 'M') &&
(filename[strlen(filename)-2] == 'P') &&
(filename[strlen(filename)-1] == '3'))
{
// An mp3 item will add 1 of songnumbers.
songnumbers++;
}
entry.close();
}
}
return songnumbers;
}
/* This function is for generating the original mp3 list */
/* mp3 list file will use the latest timestamp in SD Card */
short genOrigListFile(const char *f, SdBaseFile * dir, int numTabs) {
// entry is for recording the file information
SdFile entry;
// length is 8(filename)+1(.)+3(suffix)+1(NUL) == 13
char filename[13];
/* Create file from "f" for recording the result */
open_count++;
if(!file.isOpen())
{
/* Create one */
if(!file.open(f, O_CREAT | O_TRUNC | O_WRITE))
{
/* Create failed will return 3 */
return 3;
}
}
// Set the file's current position to zero
dir->rewind();
// open Next item, until the end of the world.
while(entry.openNext(dir, O_READ)) {
// If this entry is a sub-directory, Print itself and sub-entries
if(entry.isSubDir())
{
// Use spaces for indicating the directory layers.
for(uint8_t i=0; i < numTabs; i++) {
//Serial.print(" ");
file.write(" ");
}
memset(filename, '\0', 13);
entry.getFilename(filename);
uint8_t lastchar = strlen(filename);
//filename[lastchar+1]='\0';
filename[lastchar]='/';
file.write(filename);
file.write("\r\n");
dir_t dir_time;
entry.dirEntry(&dir_time);
if((dir_time.lastWriteDate > latestWriteDate))
{
latestWriteDate = dir_time.lastWriteDate;
latestWriteTime = dir_time.lastWriteTime;
}
if((dir_time.lastWriteDate == latestWriteDate))
{
if(dir_time.lastWriteTime > latestWriteTime)
{
latestWriteTime = dir_time.lastWriteTime;
}
}
// Get the current index, use this index for recursively print the sub-directories
uint16_t index = dir->curPosition()/32 -1;
SdBaseFile s;
if(s.open(dir, index, O_READ))
{
if(numTabs <=2 )
{
genOrigListFile(f, &s, numTabs + 1);
}
}
entry.close();
}
// Common files will directly be displayed.
else
{
// Calculate how many MP3 exists in SD card.
memset(filename, '\0', 13);
entry.getFilename(filename);
if((filename[strlen(filename)-3] == 'M') &&
(filename[strlen(filename)-2] == 'P') &&
(filename[strlen(filename)-1] == '3'))
{
// Use spaces for indicating the directory layers.
for(uint8_t i=0; i < numTabs; i++) {
//Serial.print(" ");
file.write(" ");
}
//entry.getFilename(filename);
file.write(filename);
file.write("\r\n");
dir_t dir_time;
entry.dirEntry(&dir_time);
if((dir_time.lastWriteDate > latestWriteDate))
{
latestWriteDate = dir_time.lastWriteDate;
latestWriteTime = dir_time.lastWriteTime;
}
if((dir_time.lastWriteDate == latestWriteDate))
{
if(dir_time.lastWriteTime > latestWriteTime)
{
latestWriteTime = dir_time.lastWriteTime;
}
}
}
entry.close();
}
}
// open_count will decrease for avoiding open it several times.
open_count--;
// Close opened file at the end of all routine, failed if we received 4.
if(open_count == 0)
{
// update the timestamp.
dir_t dir_play;
file.dirEntry(&dir_play);
// Update the timestamp for generated file. later we will use this timestamp for updating.
if (!file.timestamp(T_WRITE, (1980+(latestWriteDate>>9)), ((latestWriteDate>>5)&0XF), (latestWriteDate & 0X1F), (latestWriteTime >> 11), ((latestWriteTime >> 5) & 0X3F), ((latestWriteTime & 0X1F)*2)))
{
Serial.println("set Write time Failed");
}
file.sync();
if(!file.close())
{
return 4;
}
}
return 0;
}
/* This function will get raw file list from Original file
* then output with the full name to the dest file */
short genPlayList(const char *src, const char *dest)
{
char str[100];
short n=0;
short SpaceCounts, i, j, k;
char *dirname[4] = {
0 };
// 10 layers means (8+1)*10layer+13(file)
char *prefix = (char *)malloc(9*4 + 13);
for( j = 0; j < 4; j++)
{
// malloc size is 8(dir name) + 1("/") + 1(NULL) = 10
dirname[j] = (char *)malloc(10);
}
file.open(src, O_READ);
if(!file.isOpen())
{
return 1;
}
// pl == PlayList file
SdFile plfile(dest, O_CREAT | O_TRUNC | O_WRITE);
if(!plfile.isOpen())
{
return 2;
}
while((n = file.fgets(str, sizeof(str))) > 0)
{
// Change the '\r' to the NUL, means the end of the string.
short len = strlen(str) -1;
if(str[len] == '\n')
{
str[len] = 0;
}
if(str[len -1] == '\r')
{
str[len - 1] = 0;
}
SpaceCounts = 0;
for( i = 0; i < strlen(str); i++)
{
if(str == ' ')
{
SpaceCounts++;
}
}
// Directly print the MP3 files under the root directory
if((!strncmp(str+strlen(str)-3, "MP3", 4)) && (SpaceCounts == 0))
{
plfile.write(str);
plfile.write("\r\n");
}
// Processing directory entries
if(str[strlen(str) - 1] == '/')
{
// Remove the SpaceCounts and copy the rest of the name into string array dirname[]
strcpy(dirname[(SpaceCounts/2)], (char *)(str+SpaceCounts));
}
// Print the MP3 which locates in sub-directories
if((SpaceCounts >= 2) && (str[strlen(str) - 1] != '/'))
{
memset(prefix, '\0', 9*4 + 13);
for( k = 0; k <= (SpaceCounts/2); k++ )
{
strcat(prefix, dirname[k]);
}
strcat(prefix, str+SpaceCounts);
plfile.write(prefix, strlen(prefix));
plfile.write("\r\n");
delay(10);
}
} // end of while()
for(j = 0; j < 3; j++)
{
free(dirname[j]);
}
free(prefix);
// Generate the real player file.
if(!file.close())
{
return 5;
}
if(!plfile.close())
{
return 6;
}
return 0;
}
/* This function is for scanning all of the directories and sub-items
* to fetch the latest timestamp, we will use the latest timestamp for
* judging update playlist or not
*/
void getLatestStamp(SdBaseFile * dir, short numTabs) {
// entry is for recording the file information
SdFile entry;
// length is 8(filename)+1(.)+3(suffix)+1(NUL) == 13
char filename[13];
// open Next item, until the end of the world.
while(entry.openNext(dir, O_READ)) {
// If this entry is a sub-directory, Print itself and sub-entries
if(entry.isSubDir())
{
// Get the latest timestamp of the directory.
dir_t dir_time;
entry.dirEntry(&dir_time);
if((dir_time.lastWriteDate > latestWriteDate))
{
latestWriteDate = dir_time.lastWriteDate;
latestWriteTime = dir_time.lastWriteTime;
}
if((dir_time.lastWriteDate == latestWriteDate))
{
if(dir_time.lastWriteTime > latestWriteTime)
{
latestWriteTime = dir_time.lastWriteTime;
}
}
// Get the current index, use this index for recursively print the sub-directories
uint16_t index = dir->curPosition()/32 -1;
SdBaseFile s;
if(s.open(dir, index, O_READ))
{
if(numTabs <=2) getLatestStamp(&s, numTabs + 1);
}
entry.close();
}
// Common files goes here.
else
{
// Calculate how many MP3 exists in SD card.
entry.getFilename(filename);
if((filename[strlen(filename)-3] == 'M') &&
(filename[strlen(filename)-2] == 'P') &&
(filename[strlen(filename)-1] == '3'))
{
// Get the latest timestamp of the directory.
dir_t dir_time;
entry.dirEntry(&dir_time);
if((dir_time.lastWriteDate > latestWriteDate))
{
latestWriteDate = dir_time.lastWriteDate;
latestWriteTime = dir_time.lastWriteTime;
}
if((dir_time.lastWriteDate == latestWriteDate))
{
if(dir_time.lastWriteTime > latestWriteTime)
{
latestWriteTime = dir_time.lastWriteTime;
}
}
}
entry.close();
}
}
}
/* This function will get the file's timestamp, we want to
* fetch the orginal playlist's timestamp, use it to judging update
* playlist or not.
*/
short getfileStamp(const char *f, uint16_t *date, uint16_t *time)
{
SdFile localfile(f, O_READ);
if(!localfile.isOpen())
{
Serial.println("Open Local File Failed!");
return 2;
}
// Get the latest timestamp of the directory.
dir_t dir_time;
localfile.dirEntry(&dir_time);
*date = dir_time.lastWriteDate;
*time = dir_time.lastWriteTime;
if(!localfile.close())
{
return 4;
}
return 0;
}
/* This function is for getting the numbers in PlayList */
short getListLength(char *playlistfile)
{
short tmpnum = 0;
char line[25];
int n;
delay(100);
// Read Items from the Playlist file.
// open PlayList file
SdFile rdfile(playlistfile, O_READ);
if (!rdfile.isOpen())
{
Serial.println("Open PlayList Failed!");
}
// read lines from the file
while ((n = rdfile.fgets(line, sizeof(line))) > 0)
{
if (line[n - 1] == '\n')
{
tmpnum++;
}
else
{
;
}
}
rdfile.close();
return tmpnum;
}
void selectSong(char *playlistfile, char *song, short select_number)
{
short tmpnum = select_number;
char line[50];
int n;
delay(100);
// Read Items from the Playlist file.
// open PlayList file
SdFile rdfile(playlistfile, O_READ);
if (!rdfile.isOpen())
{
Serial.println("Open PlayList Failed!");
return;
}
// read lines from the file
while ((n = rdfile.fgets(line, sizeof(line))) > 0)
{
if (line[n - 1] == '\n')
{
tmpnum--;
//songs_in_list++;
}
else
{
;
}
if(tmpnum == 0)
{
strncpy(song, line, strlen(line)-1);
song[strlen(line)-1]='\0';
}
}
rdfile.close();
}
void setup()
{
bool updateflag = 0;
delay(10);
Serial.begin(9600);
// See Free RAM
PgmPrint("Free RAM: ");
Serial.println(FreeRam());
// set 1003
Serial.println("Set VS1003...");
SPI.begin();
SPI.setBitOrder(MSBFIRST); //send most-significant bit first
SPI.setDataMode(SPI_MODE0);
SPI.setClockDivider(SPI_CLOCK_DIV16);
pinMode(7,INPUT);
pinMode(8,OUTPUT);
pinMode(6,OUTPUT);
pinMode(9,OUTPUT);
digitalWrite(4,HIGH);
Mp3Reset();
Serial.println("DONE VS1003...Begin SD Card");
// initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
// breadboards. use SPI_FULL_SPEED for better performance.
if (!sd.begin(4, SPI_FULL_SPEED)) sd.initErrorHalt();
// Start at beginning of the root directory.
// rewind is used for set current position to zero.
sd.vwd()->rewind();
// Testing Functionality:
// How many MP3 sons in SD Card
short numbers = getSongsinSD(sd.vwd(), 0);
Serial.print("Songs in SD Card is ");
Serial.println(numbers);
// See Free RAM
PgmPrint("Free RAM: ");
Serial.println(FreeRam());
// 1. If no playlist file exists, scan the whole SD to generate one
// 2. Else Check the timestamp of the playlist to see if update is needed
// 3. If update is needed, generate playlist again.
sd.vwd()->rewind();
if(!sd.exists("PL_OK.TXT")) // Condition 1
{
Serial.println("No PL_OK.TXT found!");
updateflag = 1;
}
else // Condition 2
{
Serial.println("PL_OK has been created, need to check its timestamp!");
// Set global Variables to 0 for avoiding potential mis-using
latestWriteTime = 0;
latestWriteDate = 0;
sd.vwd()->rewind();
getLatestStamp(sd.vwd(), 0);
// Get the PlayList File's timestamp, for comparing.
uint16_t ldate = 0;
uint16_t ltime = 0;
short rvalue = getfileStamp("PL_OK.TXT", &ldate,<ime);
if( (ldate == latestWriteDate) && ( ltime == latestWriteTime) )
{
Serial.println("PlayList is the newest version, update not needed!");
}
else
{
Serial.println("Need Update PlayList!");
updateflag = 1;
}
}
sd.vwd()->rewind();
if(updateflag) // Condition 3, update playlist or not
{
// Call genOrigListFile() to fetch all of the MP3 and directory layer information
short error_reason = genOrigListFile("PL_OK.TXT", sd.vwd(), 0);
if(error_reason != 0)
{
Serial.print("genOrigListFile error number is ");
Serial.println(error_reason);
}
// Call genPlayList() to generate the actual PlayList file
error_reason = genPlayList("PL_OK.TXT", "PLT.TXT");
if(error_reason != 0)
{
Serial.print("genPlayList error number is ");
Serial.println(error_reason);
}
Serial.println("Generate OrigiList and PlayList Done!");
}
else
{
Serial.println("No Update!");
}
totalsongs = getListLength("PLT.TXT");
Serial.print("Songs in PLT.TXT is");
Serial.println(totalsongs);
delay(1000);
PgmPrint("Free RAM: ");
Serial.println(FreeRam());
Serial.println("Done setup()");
}
void loop() {
PgmPrint("Free RAM: ");
Serial.println(FreeRam());
short i = 0;
char song[50];
for (i = 1; i<totalsongs; i++)
{
selectSong("PLT.TXT",song, i);
sd.vwd()->rewind();
playMP3(song);
}
}
[/code] |
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发表于 2013-8-18 21:09:29
楼主
还在继续改动中，现在只能从头到尾一首一首听，下个版本会加上跳歌、随机播放、音量调节等功能。
