📄 sd.c
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** 输 入: INT32U blockaddr: 块地址
INT8U *sendbuf : 发送缓冲区,长度512Bytes
** 输 出: 0: 成功 >0: 错误码
****************************************************************************/
unsigned char SD_WriteBlock(unsigned int blockaddr, unsigned char *sendbuf)
{
unsigned char ret,tmp[2];
if (SD_INSERT_STATUS())
{
return SD_ERR_NO_CARD; /* 卡没完全插入卡中 card is not inserted entirely */
}
if(sds.block_len==0x11)
{
}
if (blockaddr >= (sds.block_num*(sds.block_len/SD_BLOCKSIZE)))
{
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
if(SD_WP_STATUS())
{
return SD_ERR_WRITE_PROTECT; /* 卡有写保护 */
}
ret = SD_WriteSingleBlock(blockaddr); /* 写单块命令 write single block */
if (ret != SD_NO_ERR)
{
return ret;
}
ret = SD_WriteBlockData(0, SD_BLOCKSIZE, sendbuf); /* 写入数据 write data */
if (ret == SD_NO_ERR) /* 读Card Status寄存器, 检查写入是否成功 */
{ /* read Card Status register to check write wheather sucessfully */
ret = SD_ReadCard_Status(2, tmp);
if (ret != SD_NO_ERR)
{
return ret; /* 读寄存器失败 read register fail */
}
if((tmp[0] != 0) || (tmp[1] != 0))
{
ret = SD_ERR_WRITE_BLK; /* 响应指示写失败 response indicate write fail */
}
//Uart0_SendByte(0xbf);
}
return ret;
}
/***********************************************************************
** 函数名称: SD_ReadByte()
** 功能描述: 从SD/MMC卡中读一个块
** 输 入: INT32U ByteAddr: 字节地址
** 输 出: 返回数据
*************************************************************************/
unsigned char SD_ReadByte(unsigned int ByteAddr)
{
unsigned int blockaddr,bitaddr;
unsigned char buff[512];
if( (sds.block_num*sds.block_len)<= ByteAddr )
{
return SD_BLOCKADDR_ERR;
}
blockaddr = ByteAddr/SD_BLOCKSIZE;
bitaddr = ByteAddr%SD_BLOCKSIZE;
if(SD_ReadBlock(blockaddr,buff)!=SD_NO_ERR)return 0;
return buff[bitaddr];
}
/***********************************************************************
** 函数名称: SD_WriteByte()
** 功能描述: 从SD/MMC卡中写一个块
** 输 入: INT32U ByteAddr: 字节地址
** 输 出: 0: 成功 >0: 错误码
*************************************************************************/
unsigned char SD_WriteByte(unsigned int ByteAddr,unsigned char Data)
{
unsigned int blockaddr,bitaddr;
unsigned char buff[512];
unsigned char tmp;
if( (sds.block_num*sds.block_len)<= ByteAddr )
{
return SD_BLOCKADDR_ERR;
}
blockaddr = ByteAddr/SD_BLOCKSIZE;
bitaddr = ByteAddr%SD_BLOCKSIZE;
tmp = SD_ReadBlock(blockaddr,buff);
if(tmp!=SD_NO_ERR)return tmp;
if(buff[bitaddr] == Data)
{
return 0;
}
else
{
buff[bitaddr] = Data;
}
tmp = SD_WriteBlock(blockaddr,buff);
return tmp;
}
/***********************************************************************
** 函数名称: SD_ReadStr()
** 功能描述: 从SD/MMC卡中读一多个字李
** 输 入: INT32U ByteAddr: 字节地址
p:返回的数据,
len:读取的数据长度
** 输 出: 0 成功,其它失败
*************************************************************************/
unsigned char SD_ReadStr(unsigned int ByteAddr,unsigned char *p,unsigned int len)
{
unsigned int blockaddr,bitaddr;
unsigned char buff[512];
unsigned int len1,len2,c,i,tmp;
if( (sds.block_num*sds.block_len)<= ByteAddr )
{
return SD_BLOCKADDR_ERR;
}
blockaddr = ByteAddr/SD_BLOCKSIZE;
bitaddr = ByteAddr%SD_BLOCKSIZE;
if((bitaddr+len)>SD_BLOCKSIZE)
{
c = 1 ;
len1 = SD_BLOCKSIZE-bitaddr;
len2 = len - len1;
}
else
{
c = 0 ;
len1 = len;
}
tmp = SD_ReadBlock(blockaddr,buff);
if(tmp!=SD_NO_ERR)
{
return tmp;
}
for( i = 0 ; i < len1 ; i++)
{
p[i] = buff[bitaddr+i];
}
if(c)
{
tmp = SD_ReadBlock(blockaddr+1,buff);
if(tmp!=SD_NO_ERR)
{
return tmp;
}
for( i = 0 ; i < len2 ; i++)
{
p[len1+i] = buff[i];
}
return SD_NO_ERR;
}
else
{
return SD_NO_ERR;
}
}
/***********************************************************************
** 函数名称: SD_WriteStr()
** 功能描述: 从SD/MMC卡中写一个块
** 输 入: INT32U ByteAddr: 字节地址
** 输 出: 0: 成功 >0: 错误码
*************************************************************************/
unsigned char SD_WriteStr(unsigned int ByteAddr,unsigned char *Data,unsigned int len)
{
/* unsigned int blockaddr,bitaddr;
unsigned char buff[512];
unsigned int len1,len2,c,i,tmp;
if( (sds.block_num*sds.block_len)<= ByteAddr )
{
return 0;
}
blockaddr = ByteAddr/SD_BLOCKSIZE;
bitaddr = ByteAddr%SD_BLOCKSIZE;
if((bitaddr+len)>SD_BLOCKSIZE)
{
c = 1 ;
len1 = SD_BLOCKSIZE-bitaddr;
len2 = len - len1;
}
else
{
c = 0 ;
len1 = len;
}
// tmp = SD_ReadBlock(blockaddr,buff);
if(tmp!=SD_NO_ERR)
{
//return tmp;
}
for( i = 0 ; i < len1 ; i++ )
{
buff[bitaddr+i] = Data[i];
}
*/
unsigned int blockaddr,bitaddr;
unsigned char tmp;
unsigned char buff[528];
unsigned int len1,len2,i;
unsigned char c;
if( (sds.block_num*sds.block_len)<= ByteAddr )
{
return SD_BLOCKADDR_ERR;
}
blockaddr = ByteAddr/SD_BLOCKSIZE;
bitaddr = ByteAddr%SD_BLOCKSIZE;
if((bitaddr+len)>SD_BLOCKSIZE)
{
c = 1 ;
len1 = SD_BLOCKSIZE-bitaddr;
len2 = len - len1;
}
else
{
c = 0 ;
len1 = len;
}
tmp = SD_ReadBlock(blockaddr,buff);
if(tmp!=SD_NO_ERR)
{
//return tmp;
}
for( i = 0 ; i < len1 ; i++ )
{
buff[bitaddr+i] = Data[i];
}
tmp = SD_WriteBlock(0,buff);
if(tmp!=SD_NO_ERR)
{
return tmp;
}
if(c)
{
}
if(c)
{
tmp = SD_ReadBlock(blockaddr+1,buff);
if(tmp!=SD_NO_ERR)
{
return tmp;
}
for( i = 0 ; i < len2 ; i++ )
{
buff[i] = Data[len1+i];
}
tmp = SD_WriteBlock(blockaddr+1,buff);
if(tmp!=SD_NO_ERR)
{
return tmp;
}
return SD_NO_ERR;
}
else
{
return SD_NO_ERR;
}
}
/****************************************************************************
* 名 称：SDInit()
* 功 能：SD卡初始化。
* 入口参数：无
* 出口参数：其它 失败 0成功
****************************************************************************/
unsigned int SDInit( void )
{
unsigned char recbuf[4];
SD_HardWareInit();
if(SD_INSERT_STATUS()) /* 检查卡是否插入 check weather card is inserted */
{
return 0x01; //没有插入
}
if(SD_WP_STATUS())
{
return 0x02; //写保护
}
SPI_CS_CLR();
SD_SPIDelay(25);
SPI_CS_Deassert();
SD_SPIDelay(2);
if(SD_ResetSD())return 3; /* 5. 发出CMDO命令复位SD卡 send CMD0 command to reset sd card */
if(SD_ActiveInit()!=SD_NO_ERR)return 4; /* 6. 激活卡进入初始化过程. active card initialize process */
if (SD_ReadOCR(4, recbuf)!= SD_NO_ERR)return 5; /* 7. 读OCR寄存器,查询卡支持的电压值 read OCR register,get the supported voltage */
if ((recbuf[1] & 0xC0) != 0xC0)
{
return 6; /* 不支持3.3V,返回错误码 not support 3.3V,return error code */
}
SPI_ClkToMax(); /* 8. 设置SPI时钟到最大值 set SPI clock to maximum */
#if SD_CRC_EN
ret = SD_EnableCRC(1); /* 使能CRC校验 enable CRC check */
if (ret != SD_NO_ERR)
goto SD_ERR;
#endif
if(SD_SetBlockLen(SD_BLOCKSIZE)!=0)return 7; /* 9. 设置块的长度: 512Bytes Set the block length: 512Bytes */
if(SD_GetCardInfo()!=0)return 8; /* 10. 读CSD寄存器,获取SD卡信息 read CSD register, get the information of SD card */
// if(SD_SetBlockLen(SD_BLOCKSIZE)!=0)return 7; /* 9. 设置块的长度: 512Bytes Set the block length: 512Bytes */
return 0;
}
/*
SD卡命令 (2008-07-14 15:16:51)
标签：杂谈 分类：WinCE
SD卡命令共分为12类，分别为class0到class11，
不同的SDd卡，主控根据其功能，支持不同的命令集 如下:
Class0 :(卡的识别、初始化等基本命令集)
CMD0:复位SD 卡.
CMD1:读OCR寄存器.
CMD9:读CSD寄存器.
CMD10:读CID寄存器.
CMD12:停止读多块时的数据传输
CMD13:读 Card_Status 寄存器
Class2 (读卡命令集):
CMD16:设置块的长度
CMD17:读单块.
CMD18:读多块,直至主机发送CMD12为止 .
Class4(写卡命令集) :
CMD24:写单块.
CMD25:写多块.
CMD27:写CSD寄存器 .
Class5 (擦除卡命令集):
CMD32:设置擦除块的起始地址.
CMD33:设置擦除块的终止地址.
CMD38: 擦除所选择的块.
Class6(写保护命令集):
CMD28:设置写保护块的地址.
CMD29:擦除写保护块的地址.
CMD30: Ask the card for the status of the write protection bits
class7：卡的锁定，解锁功能命令集
class8：申请特定命令集 。
class10 －11 ：保留
其中 class1, class3,class9：SPI模式不支持
*/
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