mmc.h

在基于avr内核的单片机上实现MP3播放器的功能

#define MMC_SD_PORT       PORTB                    //引脚定义
#define  SD_CS  B,4
#define  SD_DI  B,5
#define  SD_DO  B,6
#define  SD_Clk  B,7


#define SPI_CS_Assert()   clr(SD_CS)  
#define SPI_CS_Deassert() set(SD_CS)



extern uint8 SD_Reset(void);
extern uint8 SD_Read_Single_Block(uint32 sector, uint8* buffer);
extern uint8 SD_Write_Single_Block(uint32 sector, uint8* buffer);
extern void  SPI_High(void);
extern uint8  SD_Send_Command(uint8 cmd, uint32 arg);
extern uint8  SPI_Write_Byte(uint8 val);