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/*
09-4-4完成FAT的初始化，读取分区表，启动扇区
09-4-5完成FAT表。文件查找
09-4-6完成双缓冲播放//88.2K不卡（24M）
*/
// CodeVisionAVR C Compiler
// (C) 1998-2004 Pavel Haiduc, HP InfoTech S.R.L.
// I/O registers definitions for the ATmega32
#pragma used+
sfrb TWBR=0;
sfrb TWSR=1;
sfrb TWAR=2;
sfrb TWDR=3;
sfrb ADCL=4;
sfrb ADCH=5;
sfrw ADCW=4; // 16 bit access
sfrb ADCSRA=6;
sfrb ADCSR=6; // for compatibility with older code
sfrb ADMUX=7;
sfrb ACSR=8;
sfrb UBRRL=9;
sfrb UCSRB=0xa;
sfrb UCSRA=0xb;
sfrb UDR=0xc;
sfrb SPCR=0xd;
sfrb SPSR=0xe;
sfrb SPDR=0xf;
sfrb PIND=0x10;
sfrb DDRD=0x11;
sfrb PORTD=0x12;
sfrb PINC=0x13;
sfrb DDRC=0x14;
sfrb PORTC=0x15;
sfrb PINB=0x16;
sfrb DDRB=0x17;
sfrb PORTB=0x18;
sfrb PINA=0x19;
sfrb DDRA=0x1a;
sfrb PORTA=0x1b;
sfrb EECR=0x1c;
sfrb EEDR=0x1d;
sfrb EEARL=0x1e;
sfrb EEARH=0x1f;
sfrw EEAR=0x1e; // 16 bit access
sfrb UBRRH=0x20;
sfrb UCSRC=0X20;
sfrb WDTCR=0x21;
sfrb ASSR=0x22;
sfrb OCR2=0x23;
sfrb TCNT2=0x24;
sfrb TCCR2=0x25;
sfrb ICR1L=0x26;
sfrb ICR1H=0x27;
sfrb OCR1BL=0x28;
sfrb OCR1BH=0x29;
sfrw OCR1B=0x28; // 16 bit access
sfrb OCR1AL=0x2a;
sfrb OCR1AH=0x2b;
sfrw OCR1A=0x2a; // 16 bit access
sfrb TCNT1L=0x2c;
sfrb TCNT1H=0x2d;
sfrw TCNT1=0x2c; // 16 bit access
sfrb TCCR1B=0x2e;
sfrb TCCR1A=0x2f;
sfrb SFIOR=0x30;
sfrb OSCCAL=0x31;
sfrb TCNT0=0x32;
sfrb TCCR0=0x33;
sfrb MCUCSR=0x34;
sfrb MCUCR=0x35;
sfrb TWCR=0x36;
sfrb SPMCR=0x37;
sfrb TIFR=0x38;
sfrb TIMSK=0x39;
sfrb GIFR=0x3a;
sfrb GICR=0x3b;
sfrb OCR0=0X3c;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-
// Interrupt vectors definitions
// Needed by the power management functions (sleep.h)
#asm
#ifndef __SLEEP_DEFINED__
#define __SLEEP_DEFINED__
.EQU __se_bit=0x80
.EQU __sm_mask=0x70
.EQU __sm_powerdown=0x20
.EQU __sm_powersave=0x30
.EQU __sm_standby=0x60
.EQU __sm_ext_standby=0x70
.EQU __sm_adc_noise_red=0x10
.SET power_ctrl_reg=mcucr
#endif
#endasm
// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.
#pragma used+
void delay_us(unsigned int n);
void delay_ms(unsigned int n);
#pragma used-
extern unsigned char MMC_SD_SendCommand(unsigned char cmd, unsigned long arg);
extern void MMC_SD_Init (void);
extern unsigned char MMC_SD_Reset(void);
extern unsigned char MMC_SD_ReadSingleBlock(unsigned long sector, unsigned char* buffer);
extern void SPI_High(void);
/* CodeVisionAVR C Compiler
Prototypes for standard library functions
(C) 1998-2003 Pavel Haiduc, HP InfoTech S.R.L.
*/
#pragma used+
int atoi(char *str);
long int atol(char *str);
float atof(char *str);
void itoa(int n,char *str);
void ltoa(long int n,char *str);
void ftoa(float n,unsigned char decimals,char *str);
void ftoe(float n,unsigned char decimals,char *str);
void srand(int seed);
int rand(void);
void *malloc(unsigned int size);
void *calloc(unsigned int num, unsigned int size);
void *realloc(void *ptr, unsigned int size);
void free(void *ptr);
#pragma used-
#pragma library stdlib.lib
//声明外部器件读写函数
extern unsigned char MMC_SD_ReadSingleBlock(unsigned long sector, unsigned char* buffer);
extern unsigned char FAT_Init();//初始化
//extern unsigned long FAT_NextCluster(unsigned long cluster);//查找下一簇号
//extern unsigned int FAT_FindItem(unsigned long cluster, BYTE *name, struct FileInfoStruct *FileInfo);//查找文件
//extern unsigned long FAT_OpenDir(BYTE * dir);//打开目录
//extern unsigned char Search(BYTE *dir,struct direntry *MusicInfo,WORD *Count,BYTE *type);//查找音乐文件
//void CopyDirentruyItem(struct direntry *Desti,struct direntry *Source);
/*------------------------------------------------------------------*/
/* Redefine Data Size */
/*------------------------------------------------------------------*/
void TransmitByte( unsigned char data );
//-----------------------------------------------------
extern unsigned char bf[512];
extern unsigned char secpclus; //每籁包函扇区数
extern unsigned int fr_fatsec; //FAT表首扇区
extern unsigned int rodir; // 根目录首扇区
extern unsigned char firstrodirclus; //根目录的首籁号
extern unsigned long filefirstclus; //文件首籁号
extern unsigned long filesize;//文件大小（字节）
unsigned int totalsongs;
unsigned int flag,j,f=0;
unsigned char chanal;//文件声道数
unsigned char timer;
unsigned char bf1[1024];
///================
void UART_Init(void)
{UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRL = (24000000/2400)/16-1;
}
//----------------------------
//==============================
void TransmitByte( unsigned char data )
{
while ( !(UCSRA & (1<<5)) );
UDR = data;
}
//-------------------------------------------
//中断服务
//主要是重设定时器初值，放出声音，检测是否要读SD卡
//------------------------------------------
interrupt [12] void timer0_ovf_isr(void)
{
TCNT0=timer+2;
OCR1AL=bf1[j];
if(chanal==2)j++;//立体声时就要用下个数给下个声道
OCR1BL=bf1[j];
j++;
if(j==512){flag=1;} //要读缓冲2
if(j==1024)
{j=0;
flag=2; //要读缓冲2
}
}
//-----------------------------------------------------
//播放函数
//-----------------------------------------------------
void PlayMusicwithKey()//播放音乐函数，一旦执行不会退出
{
unsigned char i; //循环变量
unsigned long *p;
unsigned long totalsect;//文件拥有的扇区数
unsigned int leftbytes;//剩余字节
unsigned int songs=1;
next:
#asm("cli")
Search(&songs); //找到相应的文件
TransmitByte(songs); //文件首籁号
TransmitByte(filefirstclus>>24); //文件首籁号
TransmitByte(filefirstclus>>16); //文件首籁号
TransmitByte(filefirstclus>>8); //文件首籁号
TransmitByte(filefirstclus); //文件首籁号
delay_ms(1000);
delay_ms(1000);
totalsect = filesize/512; //计算扇区数
leftbytes = filesize%512; //计算剩余的字节数
i=0;
flag=0;
FAT_LoadPartCluster(filefirstclus,0,bf1);
chanal=bf1[22];//读取声道数
p= &bf1[24];
FAT_LoadPartCluster(filefirstclus,1,&bf1[512]);
//读取WAV文件头，取得采样率，计算定时器初值
if(24000000/(*p)>255)
{
if(24000000/(*p*8)>255)
{if(24000000/(*p*64)>255)while(1);
else {timer=0xff-24000000/(*p*64);
TCCR0=0x03;
}
}
else {timer=0xff-24000000/(*p*8);
TCCR0=0x02;
}
}
else {timer=0xff-24000000/(*p);
TCCR0=0x01;
}
filefirstclus=FAT_NextCluster1(filefirstclus);
#asm("sei")
flag=0;
j=0;
while(1)
{
if(flag==1)
{
FAT_LoadPartCluster(filefirstclus,i,bf1);
flag=0;
i++;
if(i==secpclus){i=0;
filefirstclus=FAT_NextCluster1(filefirstclus);
if(filefirstclus== 0x0fffffff || filefirstclus== 0x0ffffff8 )//如果无后续簇则结束
{
songs++;
if(songs>totalsongs)songs=1;
goto next;
}
}
}
if(flag==2) {
FAT_LoadPartCluster(filefirstclus,i,&bf1[512]);
flag=0;
i++;
if(i==secpclus){i=0;
filefirstclus=FAT_NextCluster1(filefirstclus);
if(filefirstclus== 0x0fffffff || filefirstclus== 0x0ffffff8 )//如果无后续簇则结束
{
songs++;
if(songs>totalsongs)songs=1;
goto next;
}
}
}
DDRA=0x00;
PORTA=0XFF;
if(PINA!=0xff)
{ #asm("cli")
delay_ms(100);
if(PINA!=0xff)
{ f=PINA;
while(PINA!=0xff);
if(f==0xfe)
{songs++;
if(songs>totalsongs)songs=1;
goto next;
}
if(f==0xfd)
{songs--;
if(songs==0)songs=1;
goto next;
}
}
#asm("sei")
}
}
}
void main(void)
{
unsigned char retry = 0;
DDRA= 0xff;//初始化端口
PORTA = 0xff;
DDRC= 0xff;//初始化端口
PORTC = 0xff;
DDRD= 0xff;//初始化端口
PORTD = 0xff;
delay_ms(10);
TCCR0=0x02;
TCNT0=0xbc;
OCR0=0x00;
TCCR1A=0xA2;
TCCR1B=0x19;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x0;
ICR1L=0xff;
OCR1AH=0x00;
OCR1AL=30;
OCR1BH=0x00;
OCR1BL=30;
TIMSK=0x01;
ACSR=0x80;
MMC_SD_Init ();//初始化spi口
UART_Init();
while(MMC_SD_Reset())//初始化SD卡
{
retry++;
if(retry>20)
{ DDRA=0XFF;
while(1)
{for (retry=0;retry<0xff;retry++)
{TransmitByte(0X22); }
}
}
}
delay_ms(0xff);
if(FAT_Init())//初始化文件系统 支持FAT16和FAT32
{
DDRD=0XFF;
while(1)
{
TransmitByte(0xf2);
}
}
totalsongs=0;
Search(&totalsongs);//找WAV文件总数
/*
TransmitByte(totalsongs);
for(retry=1;retry<totalsongs;retry++)
{Search(&retry);
TransmitByte(retry); //文件首籁号
TransmitByte(filefirstclus>>24); //文件首籁号
TransmitByte(filefirstclus>>16); //文件首籁号
TransmitByte(filefirstclus>>8); //文件首籁号
TransmitByte(filefirstclus); //文件首籁号
}
*/
PlayMusicwithKey();
while (1)
{
// Place your code here
//TransmitByte(0xf0);
};
}
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