#define MP3_PIN        PINB
#define MP3_DATA_REQ   0x04  
#define uchar unsigned char
#define uint unsigned int
void spi_init(void);
void mp3_port_init(void);
void delay_nus(unsigned int n);
void Write_Byte_MMC(unsigned char byte);
unsigned char Read_Byte_MMC(void);
void vs1011_data_write(uchar data);
void vs1011_cmd_write(uchar address,uint data);
uint vs1011_read(uchar address);
void vs1011_init(void);