sddriver.c

SD卡的SPI驱动程序

/****************************************Copyright (c)**************************************************
**                               Guangzhou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			sddriver.c
** Last modified Date:	2005-1-6
** Last Version:		V1.0
** Descriptions:		Soft Packet of SD Card Driver: user API funciton
**
**------------------------------------------------------------------------------------------------------
** Created by:			Ming Yuan Zheng
** Created date:		2005-1-6
** Version:				V1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:			Jing.Zhang
** Modified date:		2005-12-19
** Version:				
** Descriptions:		
**
**------------------------------------------------------------------------------------------------------
** Modified by: 
** Modified date:
** Version:	
** Descriptions: 
**
********************************************************************************************************/
#include "sdconfig.h"
#include "sdhal.h"
#include "SDCmd.h"
#include "sddriver.h"
#include "zlg_avalon_spi.h"

/* the information structure variable of SD Card */
sd_struct sds;			

/* timeout unit table */
const INT32U time_unit[8] = {1000000000,100000000,10000000,
							 1000000,100000,10000,1000,100};

/* timeout value table */							 
const INT8U time_value[16] = {0,10,12,13,15,20,25,30,
                              35,40,45,50,55,60,70,80};
 
/* timeout factor table */                              
const INT8U r2w_fator[6] = {1,2,4,8,16,32};                           
    
/***************************************************************************************************
		
	  User API Function: Initialize,read,write,erase SD Card 
				
****************************************************************************************************/


/*********************************************************************************************************
** Function name:    SD_Initialize
**
** Descriptions:     Initialize sd card 
**
** input parameters:   None
**            
** Returned value:     SD_NO_ERR:  successful
**                     Others   :  fail,errors occur
**                     
**         
** Used global variables: None
** Calling modules:       
**
** Created by:        Ming Yuan Zheng
** Created Date:      2005-1-6
**-------------------------------------------------------------------------------------------------------
** Modified by:       Jing.Zhang
** Modified date:     2005-12-21
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/				

int SD_Initialize(void)
{
	INT8U recbuf[4],ret;
    
    SD_HardWareInit();					    		/* Initialize the hardware that access SD Card */
    
    if (SD_ChkCard() != 1)							/* check weather card is inserted */
    	return SD_ERR_NO_CARD;   
         
    ret = SD_ResetSD();								/* send CMD0 command to reset sd card */
    if (ret != SD_NO_ERR)
        return ret;									
 	
 	ret = SD_ActiveInit();							/* active card initialize process */
 	if (ret != SD_NO_ERR)
 		return ret;
        
   	ret = SD_ReadOCR(4, recbuf);  					/* read OCR register,get the supported voltage */
    if (ret != SD_NO_ERR)
        return ret;
    
    if ((recbuf[1] & MSK_OCR_33) != MSK_OCR_33)
        return SD_ERR_VOL_NOTSUSP;					/* not support 3.3V,return error code */
    
        
#if SD_CRC_EN        
    ret = SD_EnableCRC(1);							/* enable CRC check */
	if (ret != SD_NO_ERR)  
	  	return ret;
#endif

    ret = SD_SetBlockLen(SD_BLOCKSIZE);				/* Set the block length: 512Bytes */
    if (ret != SD_NO_ERR)  
        return ret;
        
	return (SD_GetCardInfo());						/* read CSD register, get the information of SD card */
}

/*********************************************************************************************************
** Function name:    SD_ReadBlock
**
** Descriptions:     Read a single block from sd card 
**
** input parameters:   INT32U blockaddr: address of block
**                     INT8U *recbuf   : the buffer of receive,length is 512Bytes
**            
** Returned value:     SD_NO_ERR:  successful
**                     Others   :  fail,errors occur
**                     
**         
** Used global variables: None
** Calling modules:       
**
** Created by:        Ming Yuan Zheng
** Created Date:      2005-1-6
**-------------------------------------------------------------------------------------------------------
** Modified by:       Jing.Zhang
** Modified date:     2005-12-21
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/		
int SD_ReadBlock(INT32U blockaddr, INT8U *recbuf)
{
	INT8U ret; 
	
	if (blockaddr > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;				/* operate over the card range */
	
 	ret = SD_ReadSingleBlock(blockaddr);			/* read single blocks command */						
 	if (ret != SD_NO_ERR)
 		return ret;
 	
  	return (SD_ReadBlockData(SD_BLOCKSIZE, recbuf));/* read data from sd card */	
}

/*********************************************************************************************************
** Function name:    SD_ReadMultiBlock
**
** Descriptions:     Read multi blocks from sd card 
**
** input parameters:   INT32U blockaddr: address of block
**                     INT32U blocknum : the numbers of block
**                     INT8U *recbuf   : the buffer of receive,length is 512Bytes
**            
** Returned value:     SD_NO_ERR:  successful
**                     Others   :  fail,errors occur
**                     
**         
** Used global variables: None
** Calling modules:       
**
** Created by:        Ming Yuan Zheng
** Created Date:      2005-1-6
**-------------------------------------------------------------------------------------------------------
** Modified by:       Jing.Zhang
** Modified date:     2005-12-21
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/	
#if SD_ReadMultiBlock_EN
int SD_ReadMultiBlock(INT32U blockaddr, INT32U blocknum, INT8U *recbuf)
{
    INT32U i;
    INT8U ret;
    
    if ((blockaddr + blocknum) > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;				/* operate over the card range */
    
	ret = SD_ReadMultipleBlock(blockaddr);			/* read multiple blocks command */
	if (ret != SD_NO_ERR)
		return ret;
    
    for (i = 0; i < blocknum; i++)
    {												/* read data from sd card */
    	ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf);
    	if (ret == SD_NO_ERR)
       		recbuf = recbuf + SD_BLOCKSIZE;
    	else
    		return ret;
    }
 	 
 	return (SD_StopTransmission());				    /* stop transmission operation */
}

#endif

/*********************************************************************************************************
** Function name:    SD_WriteBlock
**
** Descriptions:     Write a block to sd card
**
** input parameters:   INT32U blockaddr: address of block
**                     INT8U *sendbuf  : the buffer of send,length is 512Bytes
**            
** Returned value:     SD_NO_ERR:  successful
**                     Others   :  fail,errors occur
**                     
**         
** Used global variables: None
** Calling modules:       
**
** Created by:        Ming Yuan Zheng
** Created Date:      2005-1-6
**-------------------------------------------------------------------------------------------------------
** Modified by:       Jing.Zhang
** Modified date:     2005-12-21
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/	

int SD_WriteBlock(INT32U blockaddr, const INT8U *sendbuf)
{
	INT8U ret,tmp[2];
	
	if (blockaddr > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;							/* operate over the card range */
	
	if (SD_ChkCardWP() == 1)
		return SD_ERR_WRITE_PROTECT;							
	
	ret = SD_WriteSingleBlock(blockaddr);				/* write block address */
	if (ret != SD_NO_ERR)	
		return ret;
	
	ret = SD_WriteBlockData(0, SD_BLOCKSIZE, sendbuf);			/* write data */
 	if (ret == SD_NO_ERR)										
 	{															/* read Card Status register to check write whether successfully */
 		ret = SD_ReadCard_Status(2,tmp);
 		if (ret != SD_NO_ERR)
 			return ret;											/* read register fail */

 		if((tmp[0] != 0) || (tmp[1] != 0))
			ret = SD_ERR_WRITE_BLK; 			     			/* response indicate write fail */
 	}
  
 	return ret;													/* 返回写入结果 return the result of writing */									
}

/*********************************************************************************************************
** Function name:    SD_WriteMultiBlock
**
** Descriptions:     Write multi blocks to sd card
**
** input parameters:   INT32U blockaddr: address of block
**                     INT32U blocknum : the numbers of block
**                     INT8U *sendbuf  : the buffer of send,length is 512Bytes
**            
** Returned value:     SD_NO_ERR:  successful
**                     Others   :  fail,errors occur
**                     
**         
** Used global variables: None
** Calling modules:       
**
** Created by:        Ming Yuan Zheng
** Created Date:      2005-1-6
**-------------------------------------------------------------------------------------------------------
** Modified by:       Jing.Zhang