📄 32musb.lst
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448 1 }
449
450 void Reserved()
451 {
452 1 printuf("Undefined Interrupt Occured : %x\n", UEPINT);
453 1 }
454 //END OF USB DISK
455 //---------Edit by kent-------------------------------------------------------------
456 void MP3FsInit(unsigned char NDIV, unsigned int RDIV, unsigned char MPCD, unsigned char AUCD)
457 { //!!!!!!!!!!!!!!!先清零!!!!!!!!!这个问题在调试的时候碰到了很多麻烦!!!!!!!!!!!!!!!!!!
458 1 //例如先置5后置11时发现变成了0f，因为0101|1011=1111=F，因此总是不能改歌
459 1 PLLNDIV = 0;
460 1 PLLRDIV = 0;
461 1 MP3CLK = 0;
462 1 AUDCLK = 0;
463 1 //PLL时钟的频率计算方法
464 1 // PLLclk=(OSCclk*(RDIV+1))/(int)(NDIV+1);
465 1 //set PLL CLK
466 1 PLLNDIV = 0x7f&NDIV;//set NDIV
467 1 PLLCON |= (0x3&RDIV) << 6;//set RDIV
468 1 PLLRDIV = (0x3ff&RDIV) >> 2;
469 1 //MP3时钟频率的计算方法
470 1 //MP3CLK=PLLCLK/(int)(MPCD+1)负反馈
471 1 MP3CLK |= MPCD;//0000 0010 MPCD=2
472 1 //必须通过计算得到最小 MP3CLK 24M
473 1
474 1 //AUDCLK计算公式
475 1 //AUDCLK=PLLCLK/(int)(AUCD+1)负反馈
476 1 AUDCLK |= AUCD; //AUCD=4 必须通过计算得到 AUDCLK=12.288MHz 1a
477 1
478 1 }
479
480 void MP3Disable(void)
481 { PLLCON |= PLLRES;
482 1 PLLCON &= (~PLLEN);
483 1 MP3CON |= MSKREQ;
484 1 MP3CON &= (~MPEN);
485 1 AUDCON1 |= 0x20;
486 1 AUDCON1 &= (~0x40);
487 1 AUDCON1 &= (~0x01);
488 1 AUDCON0 = 0x08;
489 1 AUDCON1 = 0xB2;
C51 COMPILER V7.07 32MUSB 11/26/2006 21:07:28 PAGE 9
490 1 AUDDAT = 0xFF;
491 1 }
492 //<<<------------------------by frank----------------------------------------------------
493
494
495 /***Edit by kent***********************************************************/
496 void PllInit(void)
497 {
498 1 if (FirstStart)
499 1 {
500 2 AUXR1 = 0xf2; //这两个寄存器的值在用Start Application和直接上电时不一样,前一种情况下MP3解码器才工作,
501 2 PLLCON = 0; //这里强制将其置为与用Start Application按钮时一致
502 2 FirstStart = 0;
503 2 }
504 1 //锁相环时钟及MP3解码器时钟设置
505 1 CKCON |= X2; //0000 0001使能X2模式,增加处理速度,每个机器周期变成6个振荡周期即3个时钟周期
506 1
507 1 PLLCON &= (~PLLRES);//Enable PLL
508 1 PLLCON |= PLLEN;
509 1 }
510
511 void MP3Init(void)
512 {
513 1
514 1 //MP3音量及音效初始值
515 1 MP3VOR = 0x0f;//0000 1111下同
516 1 MP3VOL = 0x0f;
517 1 MP3BAS = 0x0f;
518 1 MP3MED = 0x0f;
519 1 MP3TRE = 0x0f;
520 1
521 1 //MP3CON自动上电为0011 1111
522 1 MP3CON &= (~MSKREQ); //允许产生MP3中断Clear to allow the MPREQ flag to generate a MP3 interrupt.
523 1 MP3CON |= MPEN; //使能MP3解码器Set to enable the MP3 decoder.
524 1 }
525
526 void AudioInit()
527 { unsigned char i = 10;
528 1 //音频解码器模式及时钟设置
529 1 AUDCON0 = 0x77;//0111 0110
530 1 //AUDCON1 = 0x41;//0100 0111
531 1 AUDCON1 &= (~0xB0);//SRC=0,MSREQ=0,MUDRN=0
532 1 AUDCON1 |= 0x01;
533 1 while (i)i--;
534 1 AUDCON1 |= 0x40;
535 1 }
536
537 void Init(void)
538 {
539 1 PllInit();
540 1 MP3Init();
541 1 AudioInit();
542 1 }
543 /*****Write by kent***************************************************************************************
-/
544 /*PlayInit()函数用来预检MP3歌曲的帧头并作相应的配置*/
545 void PlayInit(unsigned char *SongName)
546 {
547 1 int i = 0, j = 0, f = 0;
548 1 int k = 0;
549 1 unsigned int total_size;
550 1 //MP3Init();
C51 COMPILER V7.07 32MUSB 11/26/2006 21:07:28 PAGE 10
551 1 //分析MP3信息，可能会比较长，但是没有别的办法
552 1 //先要读出一部分文件内容，大小不能确定
553 1 //while(){
554 1 m = ReadSector(SongName, Page_Buf);//先读出512字节
555 1 ////for(k=0;k<64;k++)printuf("%x ",Page_Buf[k]);
556 1 //when the first 3 bytes are 49 44 33 the next can be 03,this means ID3 V2.3
557 1 if (Page_Buf[0] == 0x49)
558 1 if ((Page_Buf[1] == 0x44) && (Page_Buf[2] == 0x33))
559 1 {
560 2 //search the 7th-10th bytes,use the formular to calculate
561 2 /*计算公式
562 2 int total_size;
563 2 total_size = (Size[0]&0x7F)*0x200000 +(Size[1]&0x7F)*0x4000 +(Size[2]&0x7F)*0x80 +(Size[3]&0x7F)
564 2 */
565 2 total_size = (Page_Buf[6] & 0x7F) * 0x200000 + (Page_Buf[7] & 0x7F) * 0x4000 + (Page_Buf[8] & 0x7F) *
- 0x80 + (Page_Buf[9] & 0x7F);
566 2
567 2 while (total_size > 512)
568 2 {
569 3 ReadSector(SongName, Page_Buf);
570 3 total_size -=512;
571 3 }
572 2
573 2 i = total_size;
574 2 printuf("%x", total_size >> 8);
575 2 printuf("%x\n", total_size & 0xFF);
576 2 }
577 1 //else continue;
578 1
579 1 //search whether the next 1.5bytes are 0xFFF,
580 1 //如果接下来是FFF则为MP3帧头，如果不是则为扩展标签头，需要加10个字节的量
581 1 if (Page_Buf[i] != 0xFF)
582 1 i += 10;
583 1 //for(k=i;k<i+4;k++)printuf("%x ",Page_Buf[k]);
584 1 //get MP3 information from FF FX XX XX 4bytes,and show that
585 1 if ((Page_Buf[i] == 0xFF) && (Page_Buf[i + 1] & 0xF0 == 0xF0))
586 1 {
587 2 MP3_Framehead[0] = Page_Buf[i];
588 2 MP3_Framehead[1] = Page_Buf[i + 1];
589 2 MP3_Framehead[2] = Page_Buf[i + 2];
590 2 MP3_Framehead[3] = Page_Buf[i + 3];
591 2 }
592 1 //printu("The MP3 Framehead Bytes:");
593 1 printuf("%x", MP3_Framehead[0]);
594 1 printuf("%x", MP3_Framehead[1]);
595 1 printuf("%x", MP3_Framehead[2]);
596 1 printuf("%x\n", MP3_Framehead[3]);
597 1 //MP3初始化；
598 1
599 1 if (MP3_Framehead[1] & 0x08)
600 1 {//MP3Disable();//MPEG I
601 2 Init();
602 2 switch ((MP3_Framehead[2] & 0x0C) >> 2)
603 2 {
604 3 case 0x00 : MP3FsInit(24, 126, 3, 5); break;//Fs=44.1kHz
605 3 case 0x01 : MP3FsInit(124, 575, 3, 4); break;//Fs=48kHz
606 3 case 0x02 : MP3FsInit(124, 511, 3, 9); AUDCON0 = 0x76; break;//Fs=32kHz
607 3 default : break;
608 3 }
609 2 //PLLRegister=PLLCON;
610 2 //MP3Register=MP3CLK;
611 2 //AudioRegister=AUDCLK;
C51 COMPILER V7.07 32MUSB 11/26/2006 21:07:28 PAGE 11
612 2 }
613 1 else
614 1 {//MP3Disable(); //MPEG II
615 2 Init();
616 2 switch ((MP3_Framehead[2] & 0x0C) >> 2)
617 2 {
618 3 case 0x00 : MP3FsInit(24, 126, 3, 5); break;//Fs=22.05kHz
619 3 case 0x01 : MP3FsInit(124, 575, 3, 9); break;//Fs=24kHz
620 3 case 0x02 : MP3FsInit(124, 511, 3, 19); AUDCON0 = 0x76; break;//Fs=16kHz
621 3 default : break;
622 3 }
623 2
624 2 //PLLRegister=PLLCON;
625 2 //MP3Register=MP3CLK;
626 2 //AudioRegister=AUDCLK;
627 2 }
628 1 //printu("The baud rate of now playing song is:");
629 1 printuf("%x \n", BaudRate[1-MP3_Framehead[1] & 0x07][3-MP3_Framehead[1] & 0x06][(MP3_Framehead[2] & 0xF
-0) >> 4-1]);
630 1 //printu("kbps\n");
631 1
632 1 DataRead = 0;//这句一定要加上
633 1 }
634 //播放MP3歌曲*******write by jingxiao*********************************************************************
-****
635 void PlayMP3(unsigned char *SongName)
636 {
637 1 int i =0;
638 1 // while ( 1 ) {
639 1
640 1 while (MP3STA1&MPFREQ)
641 1 {//MP3解码器请求数据块
642 2 m = ReadSector(SongName, Page_Buf);//从当前歌曲中读取512字节
643 2 for (i=0; i<m; i++)
644 2 {
645 3 while (!(MP3STA1 & MPBREQ))
646 3 {//MP3解码器请求数据字节
647 4 while (!PlayState); //暂停播放
648 4 if (ChangeSong)
649 4 {//发生选曲
650 5 DataRead = 0;
651 5 ChangeSong = 0;
652 5 return;
653 5 }
654 4 }
655 3 MP3DAT = Page_Buf[i]; //向MP3解码器数据寄存器送入一个数据字节
656 3 }
657 2
658 2 if (m < 512)
659 2 {//如果从歌曲中读出的数据不足512个字节则结束本歌曲播放
660 3 NowPlaying++;
661 3 MP3InitFlag = 1;
662 3 return;
663 3 }
664 2 }
665 1
666 1 }
667 //***************************************************************************************************
668
669 void KeyBoardInit()//<<<<<------------------------change by kent-------------------------------------
670 {
671 1 P1 = 0x0f; //将端口1的低四位,即键盘对应的4位置1
C51 COMPILER V7.07 32MUSB 11/26/2006 21:07:28 PAGE 12
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