freescale

来自「Freescale 系列单片机常用模块与综合系统设计」· 代码 · 共 62 行

#ifndef __SD__
#define __SD__

/* Includes */

#include "FslTypes.h"
#include "derivative.h"
#include "SPI.h"

/* User definitions */
#define SD_BLOCK_512     
#define SD_WAIT_CYCLES 10


#define SD_DE     PTBD_PTBD7    // card detection
#define _SD_DE    PTBDD_PTBDD7    // card detection
#define kSD_Insert 0
#define kSD_Desert 1


#define SD_WR     PTBD_PTBD6    // write protection 
#define _SD_WR     PTBD_PTBD6    // write protection 
#define kSD_WP    1
#define kSD_WnP   0

/* Static Definitions */
/******************************* SD Card Standard Commands **********************************/
enum{
  SD_CMD0,  /* Resets the SD Memory Card */
  SD_CMD1,  /* Sends host capacity support information and activates the card's 
               initialization process. HCS is effective when card receives SEND_IF_COND 
               command. Reserved bits shall be set to '0'. */
  SD_CMD2,
  SD_CMD3,
  SD_CMD4,
  SD_CMD5,  
  SD_CMD6,  /* Checks switchable function (mode 0) and switches card function (mode 1).*/
  SD_CMD7,
  SD_CMD8,  /* Sends SD Memory Card interface condition that includes host supply voltage 
               information and asks the accessed card whether card can operate in supplied 
               voltage range. Reserved bits shall be set to '0'.*/
  SD_CMD9,  /* Asks the selected card to send its cardspecific data (CSD)*/
  SD_CMD10, /* Asks the selected card to send its card identification (CID) */
  SD_CMD11,
  SD_CMD12, /* Forces the card to stop transmission in Multiple Block Read Operation */
  SD_CMD13, /* Asks the selected card to send its status register. */
  SD_CMD14,
  SD_CMD15,
  SD_CMD16, /* Sets a block length (in bytes) for all following block commands (read and
               write) of a Standard Capacity Card. Block length of the read and write 
               commands are fixed to 512 bytes in a High Capacity Card. The length of 
               LOCK_UNLOCK command is set by this command in both capacity cards.*/
  SD_CMD17, /* Reads a block of the size selected by the SET_BLOCKLEN command.*/
  SD_CMD18, /* Continuously transfers data blocks from card to host until interrupted by a
               STOP_TRANSMISSION command.*/
  SD_CMD19, 
  SD_CMD20,
  SD_CMD21,
  SD_CMD22,
  SD_CMD23,
  SD_CMD24, /* Writes a block of the size selected by the SET_BLOCKLEN command. */
  SD_CMD25, /* Continuously writes blocks of data until 扴top Tran