📄 sdcard.c
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sds.erase_unit = ((csdbuf[SECTOR_SIZE_POS1] & SECTOR_SIZE_MSK1) << 1) +
((csdbuf[SECTOR_SIZE_POS2] & SECTOR_SIZE_MSK2) >> 7) + 1; /* SD (SECTOR_SIZE + 1) */
return SD_NO_ERR; /* 返回执行成功 return perform sucessfully */
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_ReadCID() Name: INT8U SD_ReadCID()
** 功能描述: 读SD卡的CID寄存器 Function: read CID register of sd card
** 输 入 : INT8U cidlen : 寄存器长度(固定为16) INT8U cidlen : len of register (fixed,is 16)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
#if SD_ReadCID_EN
INT8U SD_ReadCID(INT8U cidlen, INT8U *recbuf)
{
INT8U param[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD10, param, CMD10_R, &resp); /* 读CID寄存器命令 command that read CID register */
if ( ret != SD_NO_ERR)
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
return (SD_ReadReg(cidlen, recbuf));
}
#endif
/********************************************************************************************************************
** 函数名称: INT8U SD_StopTransmission() Name: INT8U SD_StopTransmission()
** 功能描述: 停止数据传输 Function: stop data transmission
** 输 入: 无 Input: NULL
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_StopTransmission(void)
{
INT8U param[4] = {0,0,0,0},resp;
return (SD_SendCmd(CMD12, param, CMD12_R, &resp)); /* 结束数据传输命令失败 stop transmission command fail */
}
/*********************************************************************************************************************
** 函数名称: INT8U SD_ReadCard_Status() Name: INT8U SD_ReadCard_Status()
** 功能描述: 读SD卡的 Card Status 寄存器 Function: read Card Status register of sd card
** 输 入: INT8U len: 寄存器长度(固定为2) INT8U len: len of register (fixed,is 2)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
**********************************************************************************************************************/
INT8U SD_ReadCard_Status(INT8U len, INT8U *buffer)
{
INT8U param[4] = {0,0,0,0};
return (SD_SendCmd(CMD13, param, CMD13_R, buffer)); /* 读 Card Status 寄存器 */
/* read register of Card Status */
}
/********************************************************************************************************************
** 函数名称: INT8U Sd_SetBlockLen() Name: INT8U Sd_SetBlockLen()
** 功能描述: 设置一个块的长度 Function: set a block len of sd card
** 输 入: INT32U length : 块的长度值 Input: INT32U length : the length of a block
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_SetBlockLen(INT32U length)
{
INT8U param[4],resp,ret;
SD_PackParam(param, length); /* 将参数转化为字节形式 change the parameter to bytes form */
ret = SD_SendCmd(CMD16, param, CMD16_R, &resp);
if (ret != SD_NO_ERR)
{
return ret; /* 设置块的长度为length失败 set the length of block to length fail */
}
if (resp != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
return (SD_NO_ERR); /* 返回执行成功 return perform sucessfully */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadSingleBlock() Name: INT8U SD_ReadSingleBlock()
** 功能描述: 读单块命令 Function: read single block command
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_ReadSingleBlock(INT32U blockaddr)
{
return (SD_BlockCommand(CMD17, CMD17_R, blockaddr)); /* 读单块命令 command that read single block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadMultipleBlock() Name: INT8U SD_ReadMultipleBlock()
** 功能描述: 读多块命令 Function: read multiple block command
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_ReadMultipleBlock(INT32U blockaddr)
{
return (SD_BlockCommand(CMD18, CMD18_R, blockaddr)); /* 读多块命令 command that read multiple block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_WriteSingleBlock() Name: INT8U SD_WriteSingleBlock()
** 功能描述: 写单块命令 Function: write single block command
** 输 入: INT32U blockaddr: block address Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_WriteSingleBlock(INT32U blockaddr)
{
return (SD_BlockCommand(CMD24, CMD24_R, blockaddr)); /* 写单块命令 command that write single block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_WriteMultipleBlock() Name: INT8U SD_WriteMultipleBlock()
** 功能描述: 写多块命令 Function: write multiple block command
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_WriteMultipleBlock(INT32U blockaddr)
{
return (SD_BlockCommand(CMD25, CMD25_R, blockaddr)); /* 写多块命令 command that write multiple block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ProgramCSD() Name: INT8U SD_ProgramCSD()
** 功能描述: 写CSD寄存器 Function: write CSD register
** 输 入: INT8U *buff : CSD寄存器内容 Input: INT8U *buff : the content of CSD register
INT8U len : CSD寄存器长度 INT8U len : the length of CSD register
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
#if SD_ProgramCSD_EN
INT8U SD_ProgramCSD(INT8U len, INT8U *buff)
{
INT8U param[4] = {0,0,0,0},resp,ret;
if (len != 16)
{
return SD_ERR_USER_PARAM;
}
ret = SD_SendCmd(CMD27, param, CMD27_R, &resp); /* 发送写CSD寄存器命令 send command that write CSD */
if (ret != SD_NO_ERR)
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP;
}
buff[15] = (SD_GetCRC7(buff, 15) << 1) + 0x01; /* 计算CSD中的crc 位域 calculate crc field in CSD */
return(SD_WriteBlockData(0, 16, buff));
}
/********************************************************************************************************************
** 函数名称: INT8U SD_GetCRC7() Name: INT8U SD_GetCRC7()
** 功能描述: 计算CRC7 Function: calculate crc7
** 输 入: INT8U *pSource: 数据 Input: INT8U *pSource: data
INT16U len : 数据长度 INT16U len : data length
** 输 出: CRC7码 Output: CRC7 code
*********************************************************************************************************************/
INT8U SD_GetCRC7(INT8U *pSource, INT16U len)
{
INT8U i = 0;
INT8U j;
INT8U reg = 0;
do
{
for (j = 0; j < 8; j++)
{
reg <<= 1;
reg ^= ((((pSource[i] << j) ^ reg) & 0x80) ? 0x9 : 0);
}
i++;
}
while(i < len);
return reg;
}
#endif
/********************************************************************************************************************
** 函数名称: INT8U SD_EraseStartBlock() Name: INT8U SD_EraseStartBlock()
** 功能描述: 设置块擦除起始地址 Function: select the start block address of erasing operation
** 输 入: INT32U startblock: 块地址 Input: INT32U startblock : block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_EraseBlock_EN
INT8U SD_EraseStartBlock(INT32U startblock)
{
return (SD_BlockCommand(CMD32, CMD32_R, startblock)); /* 发送擦除起始块地址 send the start block address of erasing operation */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_EraseEndBlock() Name: INT8U SD_EraseEndBlock()
** 功能描述: 设置块擦除终止地址 Function: select the end block address of erasing operation
** 输 入: INT32U endblock: 块地址 Input: INT32U Length : block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_EraseEndBlock(INT32U endblock)
{
return (SD_BlockCommand(CMD33, CMD33_R, endblock)); /* 发送擦除终止块地址 send the end block address of erasing operation */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_EraseSelectedBlock() Name: INT8U SD_EraseSelectedBlock()
** 功能描述: 擦除已选中的块 Function: erase block selected
** 输 入: 无 Input: NULL
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_EraseSelectedBlock(void)
{
INT8U param[4],resp,tmp;
SD_PackParam(param, 0);
tmp = SD_SendCmd(CMD38, param, CMD38_R, &resp); /* 擦除所选择的块 erase blocks selected */
if (tmp != SD_NO_ERR)
{
return tmp;
}
if (SD_WaitBusy(SD_WAIT_ERASE) != SD_NO_ERR) /* 等待擦除完成 wait for finishing erasing */
{
return SD_ERR_TIMEOUT_ERASE;
}
else
{
return SD_NO_ERR;
}
}
/*********************************************************************************************************************
** 函数名称: INT8U SD_EraseBlock() Name: INT8U SD_EraseBlock()
** 功能描述: 擦除SD卡中的块 Function: Erase the block of sd card
** 输 入: INT32U startaddr: 起始地址 Input: INT32U startaddr: start address
INT32U endaddr : 终止地址 INT32U endaddr : end address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
** 注 意: startaddr 和 blocknum 建议为sds.erase_uint的整数倍, 因为有的卡只能以sds.erase_uint为单位进行擦除
*********************************************************************************************************************/
INT8U SD_EraseBlock(INT32U startaddr, INT32U blocknum)
{
INT32 tmp;
INT8U ret;
if ((startaddr + blocknum) > sds.block_num)
{
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
if (SD_ChkCardWP() == 1)
{
return SD_ERR_WRITE_PROTECT; /* 卡有写保护 */
}
tmp = blocknum - sds.erase_unit;
while(tmp >= 0) /* 每次擦除扇区大小 once erase is sector size */
{
ret = SD_EraseStartBlock(startaddr); /* 选择起始块地址 select start address */
if (ret != SD_NO_ERR)
{
return ret;
}
ret = SD_EraseEndBlock(startaddr + sds.erase_unit - 1); /* 选择终止块地址 select end address */
if (ret != SD_NO_ERR)
{
return ret;
}
ret = SD_EraseSelectedBlock(); /* 擦除所选的块 erase blocks selected */
if (ret != SD_NO_ERR)
{
return ret;
}
startaddr += sds.erase_unit; /* 起始地址递增 */
blocknum -= sds.erase_unit;
tmp = blocknum - sds.erase_unit;
};
if (blocknum > 0) /* 擦除不够擦除扇区大小的块 */
{ /* erase blocks that numbers is not enough a sector */
ret = SD_EraseStartBlock(startaddr);
if (ret != SD_NO_ERR)
{
return ret;
}
ret = SD_EraseEndBlock(startaddr + blocknum - 1);
if (ret != SD_NO_ERR)
{
return ret;
}
ret = SD_EraseSelectedBlock();
if (ret != SD_NO_ERR)
{
return ret;
}
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