spi_mmc.h

LPC2142 的SD卡读写程序

/*----------------------------------------------------------------------
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 --------------------------------------------------------------------*/

#ifndef __SPI_MMC_H__
#define __SPI_MMC_H__

/* SPI select pin */
#define SPI_SEL			0x00100000

/* The SPI data is 8 bit long, the MMC use 48 bits, 6 bytes */
#define MMC_CMD_SIZE	6

/* the max SD/MMC flash size is 256MB */
#define MMC_DATA_SIZE	512		/* 16-bit in size, 512 bytes */
	
#define MAX_TIMEOUT		0xFF

#define IDLE_STATE_TIMEOUT				1
#define OP_COND_TIMEOUT					2
#define SET_BLOCKLEN_TIMEOUT			3
#define WRITE_BLOCK_TIMEOUT				4
#define WRITE_BLOCK_FAIL				5
#define READ_BLOCK_TIMEOUT				6
#define READ_BLOCK_DATA_TOKEN_MISSING	7
#define DATA_TOKEN_TIMEOUT				8
#define SELECT_CARD_TIMEOUT				9
#define SET_RELATIVE_ADDR_TIMEOUT		10
#define ACMD_TIMEOUT					11

void SPI_Init( void );
void SPI_Send( BYTE *Buf, DWORD Length );
void SPI_Receive( BYTE *Buf, DWORD Length );
BYTE SPI_ReceiveByte( void );

int mmc_init(void);
int mmc_response(BYTE response);
int mmc_read_block(WORD block_number);
int mmc_write_block(WORD block_number);
int mmc_wait_for_write_finish(void);

#endif  /* __SPI_MMC_H__ */