📄 sdcard.c
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}
return SD_NO_ERR; /* 返回擦除成功 return erase sucessfully */
}
#endif
/********************************************************************************************************************
** 函数名称: void SD_WaitBusy() Name: void SD_WaitBusy()
** 功能描述: 查询SD卡是否处于忙状态 Function: poll SD Card wheather it is busy
** 输 入: INT32U waittype: 超时类型 Input: INT32U timeout: time out type
** 输 出: 0: 未超时 >0: 错误码 Output: 0: not time out > 0: error code
*********************************************************************************************************************/
INT8U SD_WaitBusy(INT8U waittype)
{
INT32U timeout;
INT32U i = 0;
INT8U tmp;
if (waittype == SD_WAIT_WRITE)
{
timeout = sds.timeout_write;
}
else
{
timeout = sds.timeout_erase;
}
SPI1_CS_CLR();
do
{ /* 等待忙结束 wait for being busy end */
tmp = SPI1_SrByte(0XFF);
i++;
}
while ((tmp != 0xFF) && (i < timeout)); /* 忙时收到的值为0xFF always receive 0xFF when card is busy */
SPI1_CS_SET(); /* 有错 */
if(i < timeout)
{
return SD_NO_ERR; /* 返回0,表示没超时 return 0 indicate that operation is not time out */
}
else
{
return SD_ERR_TIMEOUT_WAIT; /* 返回错误码,表示超时 return error code indicate that operation is time out */
}
}
/*********************************************************************************************************************
** 函数名称: INT8U SD_ReadOCR() Name: INT8U SD_ReadOCR()
** 功能描述: 读操作条件寄存器OCR Function: read OCR register of sd card
** 输 入: INT8U ocrlen : 寄存器长度(固定为4) Input: INT8U ocrlen : len of register (fixed,is 4)
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_ReadOCR(INT8U ocrlen, INT8U *recbuf)
{
INT8U param[4] = {0,0,0,0},resp[5],tmp;
tmp = SD_SendCmd(CMD58, param, CMD58_R, resp); /* 读 OCR 寄存器命令 */
if (tmp != SD_NO_ERR) /* read OCR register command */
{
return tmp;
}
if (resp[0] != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
for (tmp = 0; tmp < 4; tmp++)
{
recbuf[tmp] = resp[tmp + 1]; /* 复制OCR寄存器内容到接收缓冲区 */
}
return (SD_NO_ERR);
}
/********************************************************************************************************************
** 函数名称: INT8U SD_EnableCRC() Name: INT8U SD_EnableCRC()
** 功能描述: 使能SD卡的CRC校验功能 Function: enable crc check of SD Card
** 输 入: INT8U bEnable : 1:使能 0:禁止 Input: INT8U bEnable : 1:enable 0: disable
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_CRC_EN
INT8U SD_EnableCRC(INT8U bEnable)
{
INT8U param[4],resp,ret;
if (bEnable == 1)
{
param[0] = 1; /* 使能crc enable crc */
}
else
{
param[1] = 0; /* 禁止crc disalbe crc */
}
ret = SD_SendCmd(CMD59, param, CMD59_R, &resp); /* "使能/禁止CRC"命令 enable/disable crc command */
if (ret != SD_NO_ERR)
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
return (SD_NO_ERR);
}
#endif
/*********************************************************************************************************************
** 函数名称: INT8U SD_Read_SD_Status() Name: INT8U SD_Read_SD_Status()
** 功能描述: 读SD卡的 SD_Status 寄存器 Function: read SD_Status register of sd card
** 输 入: INT8U sdslen : 寄存器长度(固定为64) Input: INT8U sdslen: len of register (fixed,is 64)
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_ReadSD_Status_EN
INT8U SD_ReadSD_Status(INT8U sdslen, INT8U *recbuf)
{
INT8U param[4] = {0,0,0,0},resp[2],ret;
ret = SD_SendCmd(CMD55, param, CMD55_R, resp); /* 后续命令为一个应用命令 */
if (ret != SD_NO_ERR)
{
return ret; /* command that the followed commnad is a specific application */
}
if (resp[0] != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
ret = SD_SendCmd(ACMD13, param, ACMD13_R, resp); /* 读 SD_Status 命令 */
if (ret != SD_NO_ERR)
{
return ret; /* command that read SD_Status register */
}
if ((resp[0] != 0) || (resp[1] != 0))
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
return (SD_ReadBlockData(sdslen, recbuf)); /* 读出寄存器内容 read the content of the register */
}
#endif
/*******************************************************************************************************************
** 函数名称: INT8U SD_ReadSCR() Name: INT8U SD_ReadSCR()
** 功能描述: 读SD卡的 SCR 寄存器 Function: read SCR register of sd card
** 输 入: INT8U scrlen : 寄存器长度(固定为8) Input: INT8U scrlen : len of register (fixed,is 8)
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_ReadSCR_EN
INT8U SD_ReadSCR(INT8U scrlen, INT8U *recbuf)
{
INT8U param[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD55, param, CMD55_R, &resp); /* 后续命令为一个应用命令 */
if (ret != SD_NO_ERR) /* command that the followed commnad is a specific application */
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
ret = SD_SendCmd(ACMD51, param, ACMD51_R, &resp); /* 发送读 SD_Status 命令*/
if (ret != SD_NO_ERR) /* command that read SD_Status register */
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
return (SD_ReadBlockData(scrlen, recbuf)); /* 读出寄存器内容 read the content of the register */
}
#endif
/********************************************************************************************************************
** 函数名称: INT8U SD_GetNumWRBlcoks() Name: INT8U SD_GetNumWRBlcoks()
** 功能描述: 得到正确写入的块数 Function: get the block numbers that written correctly
** 输 入: INT32U *blocknum: 返回的块数 Input: INT32U blocknum : the block numbers returned
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_WriteMultiBlock_EN
INT8U SD_GetNumWRBlcoks(INT32U *blocknum)
{
INT8U tmp[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD55, tmp, CMD55_R, &resp); /* 后续命令为一个应用命令 */
if (ret != SD_NO_ERR) /* command that the followed commnad is a specific application */
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP;
}
ret = SD_SendCmd(ACMD22, tmp, ACMD22_R, &resp); /* 读取正确写入的块数命令 */
if (ret != SD_NO_ERR) /* command that read the numbers of block written correctly */
{
return ret;
}
if (resp != 0)
{
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
}
ret = SD_ReadBlockData(4, tmp); /* 读块数 read the numbvers of block */
if (ret != SD_NO_ERR)
{
return ret;
}
*blocknum = (tmp[0] << 24) + (tmp[1] << 16) + (tmp[2] << 8) + tmp[3];
/* 转换为32位 change to 32 bits */
return (SD_NO_ERR); /* 返回执行成功 return perform sucessfully */
}
#endif
/*******************************************************************************************************************
** 函数名称: INT8U SD_ReadBlockData() Name: INT8U SD_ReadBlockData()
** 功能描述: 从SD卡中读取数据块 Function: read block data from sd card
** 输 入: INT32U len : 长度 Input: INT32U len : length
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : the buffer of receive
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*******************************************************************************************************************/
INT8U SD_ReadBlockData(INT32U len, INT8U *recbuf)
{
INT8U tmp;
INT32U i = 0;
SPI1_CS_CLR();
do
{ /* 等待接收数据开始令牌0xFE wait for receiving data start token 0xFE */
tmp = SPI1_SrByte(0XFF);
i++;
}
while((tmp == 0xFF) && (i < sds.timeout_read));
if (i >= sds.timeout_read)
{
SPI1_CS_SET();
return SD_ERR_TIMEOUT_READ; /* 返回读超时错误码 return error timeout error code of reading */
}
if (tmp != SD_TOK_READ_STARTBLOCK) /* 块读开始令牌错误 read start block token is error */
{
SPI1_SrByte(0xFF);
SPI1_CS_SET();
return SD_ERR_DATA_START_TOK;
}
for (i = 0; i < len; i++)
{
recbuf[i] = SPI1_SrByte(0XFF); /* 接收数据 receive data */
}
i = SPI1_SrByte(0XFF);
i = (i << 8) + SPI1_SrByte(0XFF); /* 读取16位CRC get 16-bit CRC */
#if SD_CRC_EN
if (i != SD_GetCRC16(recbuf, len))
{ /* CRC校验错误 CRC check is error */
SPI1_SrByte(0xFF);
SPI1_CS_SET();
return SD_ERR_DATA_CRC16; /* 返回CRC16错误 return error of CRC16 */
}
#endif
SPI1_SrByte(0xFF);
SPI1_CS_SET();
return (SD_NO_ERR); /* 返回函数执行成功 return function perform sucessfully */
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_WriteBlockData() Name: INT8U SD_WriteBlockData()
** 功能描述: 向sd卡写数据块 Function: write block data to sd card
** 输 入: INT8U bmulti : 是否为多块操作1:是0:否 Input: INT8U bmulti : multi blocks operate 1:Y 0:N
INT32U len : 长度 INT32U len : length
INT8U *sendbuf: 发送缓冲区 INT8U *sendbuf : the buffer of send
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
INT8U SD_WriteBlockData(INT8U bmulti, INT32U len, INT8U *sendbuf)
{
INT16U i;
INT8U tmp;
SPI1_CS_CLR();
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