/************************************************************/
	         HEAD FILE  for   sd					
/************************************************************/
#define uchar unsigned char
#define uint unsigned int
void spi_init(void);
uchar SD_Write_Command(uchar cmd,unsigned long arg);
void sd_port_init(void);
uchar SD_Init(void);
uchar SD_Read_Block(unsigned long address);
void delay_nus(uint n);