www.pudn.com > File_SD_OS.rar > sddriver.c
/****************************************Copyright (c)**************************************************
** Guangzhou ZLG-MCU Development Co.,LTD.
** graduate school
** http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name: sddriver.c
** Last modified Date: 2005-3-10
** Last Version: V2.0
** Descriptions: SD/MMC卡读写模块: 物理层 用户API函数
** Soft Packet of SD Card: user API funciton
**
**------------------------------------------------------------------------------------------------------
** Created by: Ming Yuan Zheng
** Created date: 2005-1-6
** Version: V1.0
** Descriptions: The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by: Ming Yuan Zheng
** Modified date: 2005-3-10
** Version: V2.0
** Descriptions: 增加了对MMC卡的支持,增加了对UCOS-II的支持,使该模块不仅能运行于前后台系统,还可运行
** 于UCOS-II上
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#include "config.h"
#include "sdhal.h"
#include "SDCmd.h"
#if SD_UCOSII_EN
OS_EVENT *pSemSD = NULL; /* 卡访问权限信号量 semaphore that access card */
#endif
/* SD卡信息结构体变量 the information structure variable of SD Card */
sd_struct sds;
/* 超时时间单位表(单位:0.000000001ns) timeout unit table */
const INT32U time_unit[8] = {1000000000,100000000,10000000,
1000000,100000,10000,1000,100};
/* 超时时间表 timeout value table */
const INT8U time_value[16] = {0,10,12,13,15,20,25,30,
35,40,45,50,55,60,70,80};
/* 超时时间因数表 timeout factor table */
const INT8U r2w_fator[8] = {1,2,4,8,16,32,64,128};
/*
***************************************************************************************************
用户API函数: 初始化,读,写,擦 SD卡 User API Function: Initialize,read,write,erase SD Card
***************************************************************************************************
*/
/*******************************************************************************************************************
** 函数名称: INT8U SD_Initialize() Name: INT8U SD_Initialize()
** 功能描述: 初始化SD/MMC卡 Function: initialize SD/MMC card
** 输 入: 无 Input: NULL
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
INT8U SD_Initialize(void)
{
INT8U recbuf[4],ret;
#if SD_UCOSII_EN
if (pSemSD == NULL)
{
pSemSD = OSSemCreate(1); /* 创建访问SD/MMC卡信号量 create SD/MMC semaphore */
if (pSemSD == NULL)
return SD_ERR_CREATE_SEMSD;
}
#endif
SD_StartSD();
SD_HardWareInit(); /* 初始化读写SD卡的硬件条件 Initialize the hardware that access SD Card */
if (SD_ChkCard() != 1) /* 检查卡是否插入 check weather card is inserted */
{
ret = SD_ERR_NO_CARD;
goto SD_ERR;
}
SPI_CS_Assert(); /* 1. 置CS为低 assert CS */
SD_SPIDelay(25); /* 2. 至少延时 74 clock delay more than 74 clock */
SPI_CS_Deassert(); /* 3. 置CS为高 dessert CS */
SD_SPIDelay(2); /* 4. 延时2(8 clock) delay 2(8 clock) */
ret = SD_ResetSD(); /* 5. 发出CMDO命令复位SD卡 send CMD0 command to reset sd card */
if (ret != SD_NO_ERR)
goto SD_ERR;
ret = SD_ActiveInit(); /* 6. 激活卡进入初始化过程. active card initialize process */
if (ret != SD_NO_ERR)
goto SD_ERR;
ret = SD_ReadOCR(4, recbuf); /* 7. 读OCR寄存器,查询卡支持的电压值 read OCR register,get the supported voltage */
if (ret != SD_NO_ERR)
goto SD_ERR;
if ((recbuf[1] & MSK_OCR_33) != MSK_OCR_33)
{
ret = SD_ERR_VOL_NOTSUSP; /* 不支持3.3V,返回错误码 not support 3.3V,return error code */
goto SD_ERR;
}
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
ret = SD_SetBlockLen(SD_BLOCKSIZE); /* 9. 设置块的长度: 512Bytes Set the block length: 512Bytes */
if (ret != SD_NO_ERR)
goto SD_ERR;
ret = SD_GetCardInfo(); /* 10. 读CSD寄存器,获取SD卡信息 read CSD register, get the information of SD card */
if (ret != SD_NO_ERR)
goto SD_ERR;
SD_EndSD();
return SD_NO_ERR; /* 初始化成功 initialize sucessfully */
SD_ERR:
SD_EndSD();
return ret;
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadBlock() Name: INT8U SD_ReadBlock()
** 功能描述: 从SD/MMC卡中读一个块 Function: read a single block from SD/MMC card
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: address of block
INT8U *recbuf : 接收缓冲区,长度512Bytes INT8U *recbuf : the buffer of receive,length is 512Bytes
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_ReadBlock(INT32U blockaddr, INT8U *recbuf)
{
INT8U ret;
SD_StartSD(); /* 向OS申请访问卡信号量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡没完全插入卡中 card is not inserted entirely */
}
if (blockaddr > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
ret = SD_ReadSingleBlock(blockaddr); /* 读单块命令 read single blocks command */
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf); /* 读出数据 read data from sd card */
SD_EndSD(); /* 归还访问卡信号量 return semaphore acessed SD/MMC to OS */
return ret;
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadMultiBlock() Name: INT8U SD_ReadMultiBlock()
** 功能描述: 从SD/MMC卡中读多个块 Function: read multi blocks from SD/MMC card
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: address of block
INT32U blocknum : 块数量 INT32U blocknum : the numbers of block
INT8U *recbuf : 接收缓冲区,每块512字节 INT8U *recbuf : the buffer of receive,each block length is 512Bytes
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_ReadMultiBlock_EN
INT8U SD_ReadMultiBlock(INT32U blockaddr, INT32U blocknum, INT8U *recbuf)
{
INT32U i;
INT8U ret;
SD_StartSD(); /* 向OS申请访问卡信号量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡没完全插入卡中 card is not inserted entirely */
}
if ((blockaddr + blocknum) > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
ret = SD_ReadMultipleBlock(blockaddr); /* 读多块命令 read multiple blocks command */
if (ret != SD_NO_ERR)
{
SD_EndSD(); /* 归还访问卡信号量 return semaphore acessed SD/MMC to OS */
return ret;
}
for (i = 0; i < blocknum; i++)
{ /* 读出数据 read data from SD/MMC card */
ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf);
if (ret == SD_NO_ERR)
recbuf = recbuf + SD_BLOCKSIZE;
else
{
SD_EndSD();
return ret;
}
}
ret = SD_StopTransmission(); /* 结束数据传输 stop transmission operation */
SD_EndSD();
return ret;
}
#endif
/********************************************************************************************************************
** 函数名称: INT8U SD_WriteBlock() Name: INT8U SD_WriteBlock()
** 功能描述: 向SD/MMC卡中写入一个块 Function: write a block to SD/MMC card
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: address of block
INT8U *sendbuf : 发送缓冲区,长度512Bytes INT8U *sendbuf : the buffer of send,length is 512Bytes
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
INT8U SD_WriteBlock(INT32U blockaddr, INT8U *sendbuf)
{
INT8U ret,tmp[2];
SD_StartSD(); /* 向OS申请访问卡信号量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡没完全插入卡中 card is not inserted entirely */
}
if (blockaddr > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
if (SD_ChkCardWP() == 1)
{
SD_EndSD();
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)
{
SD_EndSD();
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)
{
SD_EndSD();
return ret; /* 读寄存器失败 read register fail */
}
if((tmp[0] != 0) || (tmp[1] != 0))
{
SD_EndSD();
ret = SD_ERR_WRITE_BLK; /* 响应指示写失败 response indicate write fail */
}
}
SD_EndSD();
return ret; /* 返回写入结果 return the result of writing */
}
/**********************************************************************************************************************
** 函数名称: INT8U SD_WriteMultiBlock() Name: INT8U SD_WriteMultiBlock()
** 功能描述: 向SD/MMC卡中写入多个块 Function: write multi blocks to SD/MMC card
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: address of block
INT32U blocknum : 块数量 INT32U blocknum : the numbers of block
INT8U *sendbuf : 发送缓冲区每块512字节 INT8U *sendbuf : the send buffer,each block length is 512Bytes
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
***********************************************************************************************************************/
#if SD_WriteMultiBlock_EN
INT8U SD_WriteMultiBlock(INT32U blockaddr, INT32U blocknum, INT8U *sendbuf)
{
INT32U i;
INT8U ret,tmp[2];
SD_StartSD(); /* 向OS申请访问卡信号量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡没完全插入卡中 card is not inserted entirely */
}
if ((blockaddr + blocknum) > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
if (SD_ChkCardWP() == 1)
{
SD_EndSD();
return SD_ERR_WRITE_PROTECT; /* 卡有写保护 */
}
ret = SD_WriteMultipleBlock(blockaddr); /* 写多块命令 write multiple blocks command */
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
for (i = 0; i < blocknum; i++)
{
ret = SD_WriteBlockData(1, SD_BLOCKSIZE, sendbuf); /* 写入数据 write data */
if (ret == SD_NO_ERR)
sendbuf = sendbuf + SD_BLOCKSIZE;
else
{ /* 写失败 write fail */
SD_StopTransmission(); /* 停止数据传输 stop data transmission */
SD_WaitBusy(SD_WAIT_WRITE); /* 等待 waiting */
SD_EndSD();
return ret;
}
}
SD_StopMultiToken(); /* 发送数据停止令牌 send data stop token */
ret = SD_WaitBusy(SD_WAIT_WRITE); /* 等待写入的完成 wait for finishing writing */
if (ret != SD_NO_ERR)
{
SD_EndSD();
return SD_ERR_TIMEOUT_WRITE;
}
if (sds.card_type == CARDTYPE_SD)
{
ret = SD_GetNumWRBlcoks(&i); /* 读正确写入的块数 read the blocks that be written correctly */
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
if(i != blocknum)
ret = SD_ERR_WRITE_BLKNUMS; /* 正确写入块数错误 the blocks that be written correctly is error */
}
else
{
ret = SD_ReadCard_Status(2, tmp);
if (ret != SD_NO_ERR)
{
SD_EndSD();
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 */
}
SD_EndSD();
return ret; /* 返回写入成功 return write sucessfully */
}
#endif
/*********************************************************************************************************************
** 函数名称: INT8U SD_EraseBlock() Name: INT8U SD_EraseBlock()
** 功能描述: 擦除SD/MMC卡中的块 Function: Erase the block of SD/MMC 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: 成功 >0: 错误码 Output: 0: right >0: error code
** 注 意: startaddr 和 blocknum 建议为 sds.erase_unit 的整数倍, 因为有的卡只能以 sds.erase_unit 为单位进行擦除
*********************************************************************************************************************/
#if SD_EraseBlock_EN
INT8U SD_EraseBlock(INT32U startaddr, INT32U blocknum)
{
INT32 tmp;
INT8U ret;
SD_StartSD(); /* 向OS申请访问卡信号量 request semaphore acessed SD/MMC to OS */
if (SD_ChkCard() != 1)
{
SD_EndSD();
return SD_ERR_NO_CARD; /* 卡没完全插入卡中 card is not inserted entirely */
}
if ((startaddr + blocknum) > sds.block_num)
{
SD_EndSD();
return SD_ERR_OVER_CARDRANGE; /* 操作超出卡容量范围 operate over the card range */
}
if (SD_ChkCardWP() == 1)
{
SD_EndSD();
return SD_ERR_WRITE_PROTECT; /* 卡有写保护 */
}
tmp = blocknum - sds.erase_unit;
while(tmp >= 0) /* 每次擦除扇区 once erase is sector size */
{
ret = SD_EraseStartBlock(startaddr); /* 选择起始块地址 select start address */
if (ret != SD_NO_ERR)
{
SD_EndSD();
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)
{
SD_EndSD();
return ret;
}
ret = SD_EraseSelectedBlock(); /* 擦除所选的块 erase blocks selected */
if (ret != SD_NO_ERR)
{
SD_EndSD();
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once_erase块 */
{ /* erase blocks that numbers is not enough once_erase */
ret = SD_EraseStartBlock(startaddr);
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
ret = SD_EraseEndBlock(startaddr + blocknum - 1);
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
ret = SD_EraseSelectedBlock();
if (ret != SD_NO_ERR)
{
SD_EndSD();
return ret;
}
}
SD_EndSD();
return SD_NO_ERR; /* 返回擦除成功 return erase sucessfully */
}
#endif
/*****************************************************************
下面为子程序
*****************************************************************/
/*******************************************************************************************************************
** 函数名称: INT8U SD_GetCardInfo() Name: INT8U SD_GetCardInfo()
** 功能描述: 获得SD/MMC卡的信息 Function: get the information of SD/MMC card
** 输 入: INT8U cardtype: 卡类型 Input: INT8U cardtype: card type
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
*******************************************************************************************************************/
INT8U SD_GetCardInfo()
{
INT32U tmp;
INT8U csdbuf[16],ret;
ret = SD_ReadCSD(16, csdbuf); /* 读CSD寄存器 read CSD register */
if (ret != SD_NO_ERR)
return ret;
SD_CalTimeout(csdbuf); /* 计算超时时间值 calculate timeout value */
/* 计算块的最大长度 */ /* calculate the size of a sector */
sds.block_len = 1 << (csdbuf[READ_BL_LEN_POS] & READ_BL_LEN_MSK); /* (2 ^ READ_BL_LEN) */
/* 计算卡中块的个数 */ /* calculate the sector numbers of the SD Card */
sds.block_num = ((csdbuf[C_SIZE_POS1] & C_SIZE_MSK1) << 10) +
(csdbuf[C_SIZE_POS2] << 2) +
((csdbuf[C_SIZE_POS3] & C_SIZE_MSK3) >> 6) + 1; /* (C_SIZE + 1)*/
tmp = ((csdbuf[C_SIZE_MULT_POS1] & C_SIZE_MULT_MSK1) << 1) +
((csdbuf[C_SIZE_MULT_POS2] & C_SIZE_MULT_MSK2) >> 7) + 2; /* (C_SIZE_MULT + 2) */
/* 获得卡中块的数量 */ /* get the block numbers in card */
sds.block_num = sds.block_num * (1 << tmp); /* (C_SIZE + 1) * 2 ^ (C_SIZE_MULT + 2) */
/* 计算擦除的单位(单位: 块) */
if (sds.card_type == CARDTYPE_MMC)
{
tmp = ((csdbuf[ERASE_GRP_SIZE_POS] & ERASE_GRP_SIZE_MSK) >> 2) + 1; /* (ERASE_GRP_SIZE + 1) */
/* (ERASE_GRP_SIZE + 1) * (ERASE_GRP_MULTI + 1) */
tmp *= ((csdbuf[ERASE_GRP_MULTI_POS1] & ERASE_GRP_MULTI_MSK1) << 3) +
((csdbuf[ERASE_GRP_MULTI_POS2] & ERASE_GRP_MULTI_MSK2) >> 5) + 1;
}
else /*calculate the size of sector */
tmp = ((csdbuf[SECTOR_SIZE_POS1] & SECTOR_SIZE_MSK1) << 1) +
((csdbuf[SECTOR_SIZE_POS2] & SECTOR_SIZE_MSK2) >> 7) + 1; /* SD: SECTOR_SIZE */
sds.erase_unit = tmp; /* 擦除单位(块) */
return SD_NO_ERR; /* 返回执行成功 return perform sucessfully */
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_CalTimeout() Name: INT8U SD_CalTimeout()
** 功能描述: 计算读/写/擦超时时间 Function: calculate timeout of reading,writing,erasing
** 输 入: INT8U *csdbuf : CSD寄存器内容 Input: INT8U *csdbuf : CSD register content
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
*******************************************************************************************************************/
INT8U SD_CalTimeout(INT8U *csdbuf)
{
INT32U tmp;
INT8U time_u,time_v,fator;
sds.timeout_read = READ_TIMEOUT_100MS; /* 默认读超时为100ms */
sds.timeout_write = WRITE_TIMEOUT_250MS; /* 默认写超时为250ms */
sds.timeout_erase = WRITE_TIMEOUT_250MS;
time_u = (csdbuf[TAAC_POS] & TAAC_MSK); /* 读超时时间单位 read timeout unit */
time_v = (csdbuf[TAAC_POS] & NSAC_MSK) >> 3; /* 读超时时间值 read timeout value */
fator = (csdbuf[R2WFACTOR_POS] & R2WFACTOR_MSK) >> 2; /* 读超时时间因数 read timeout factor */
if(time_v == 0) return SD_ERR_CARD_PARAM; /* 卡参数有错误 card parameter is error */
tmp = SPI_CLOCK * time_value[time_v] / 10 / time_unit[time_u]; /* TACC * f (单位 unit: clock) */
tmp = tmp + csdbuf[NSAC_POS] * 100; /* TACC * f + NSAC * 100 (单位 unit: clock) */
/* 计算得到的超时值 the timeout value of being calculated */
sds.timeout_read = tmp;
sds.timeout_write = tmp * r2w_fator[fator]; /* (TACC * f + NSAC * 100) * R2WFACTOR (单位 unit:clock)*/
if (sds.card_type == CARDTYPE_SD)
{
sds.timeout_read = sds.timeout_read * 100 / 8; /* 实际值为计算值的100倍 */
sds.timeout_write = sds.timeout_write * 100 / 8;
if (sds.timeout_read > READ_TIMEOUT_100MS) /* 取计算值与默认值中的最小值 */
sds.timeout_read = READ_TIMEOUT_100MS;
if (sds.timeout_write > WRITE_TIMEOUT_250MS)
sds.timeout_write = WRITE_TIMEOUT_250MS;
}
else
{
sds.timeout_read = sds.timeout_read * 10 / 8; /* 实际值为计算值的10倍 */
sds.timeout_write = sds.timeout_write * 10 / 8;
}
sds.timeout_erase = sds.timeout_write;
#if SD_UCOSII_EN
sds.timeout_read = (sds.timeout_read << 3) * OS_TICKS_PER_SEC / SPI_CLOCK;
sds.timeout_write =(sds.timeout_write << 3) * OS_TICKS_PER_SEC / SPI_CLOCK;
sds.timeout_erase = sds.timeout_write; /* (单位 unit: os tick) */
#endif
return SD_NO_ERR;
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_ActiveInit() Name: INT8U SD_ActiveInit()
** 功能描述: 激活卡,并获得卡型 Function: active card, and get the card type
** 输 入: 无 Input: NULL
** 输 出: 0: 成功 >0: 错误码 Output: 0: right >0: error code
** 函数说明: 该命令不断重复发送到SD卡，直到响应R1的Bit0(Idle)位为0，表示SD卡内部初始化处理完成。
当响应的Idle位为0时，SD卡就完全进入SPI模式了。当然重复发送命令CMD1是有次数限制的，
最大次数为宏定义SD_IDLE_WAIT_MAX.
*******************************************************************************************************************/
INT8U SD_ActiveInit(void)
{
INT8U param[4] = {0,0,0,0},resp[5],ret;
INT32U i = 0;
do
{ /* 发出CMD1, 查询卡的状态, send CMD1 to poll card status */
ret = SD_SendCmd(CMD1, param, CMD1_R, resp);
if (ret != SD_NO_ERR)
return ret;
i ++;
}while (((resp[0] & MSK_IDLE) == MSK_IDLE) && (i <= SD_IDLE_WAIT_MAX));
/* 如果响应R1的最低位Idle位为1,则继续循环 */
/* if response R1 Idle bit is 1,continue recycle */
if (i >= SD_IDLE_WAIT_MAX)
return SD_ERR_TIMEOUT_WAITIDLE; /* 超时,返回错误 time out,return error */
ret = SD_SendCmd(CMD55, param, CMD55_R, resp);
if (ret != SD_NO_ERR)
return ret;
ret = SD_SendCmd(ACMD41, param, ACMD41_R, resp); /* 激活内部初始化命令 active card to initialize process internal */
if (ret != SD_NO_ERR)
return SD_ERR_UNKNOWN_CARD;
if ((resp[0] & 0xFE) == 0)
sds.card_type = CARDTYPE_SD; /* 是SD卡 the card is SD card */
else
sds.card_type = CARDTYPE_MMC; /* 是MMC卡 the card is MMC card */
return SD_NO_ERR;
}
/*******************************************************************************************************************
** 函数名称: void SD_StartSD() Name: INT8U SD_StartSD()
** 功能描述: 向操作系统申请访问SD卡的权限 Function: request the right of operating sd to OS
** 输 入: 无 Input: NULL
** 返 回: 无 return: NULL
********************************************************************************************************************/
void SD_StartSD(void)
{
#if SD_UCOSII_EN
INT8U ret;
OSSemPend(pSemSD, 0, &ret); /* 等待访问卡信号量可用 wait for semaphore that accessed Card */
#endif
}
/*******************************************************************************************************************
** 函数名称: void SD_EndSD() Name: INT8U SD_EndSD()
** 功能描述: 访问SD卡的权限归还操作系统 Function: return the right of operating sd to OS
** 输 入: 无 Input: NULL
** 返 回: 无 return: NULL
********************************************************************************************************************/
void SD_EndSD(void)
{
#if SD_UCOSII_EN
OSSemPost(pSemSD); /* 将访问卡信号量还给操作系统 return the semaphore accessing Card to OS */
#endif
}
/*******************************************************************************************************************
** 函数名称: INT16U SD_GetZLGSDVer() Name: INT16U SD_GetZLGSDVer()
** 功能描述: 得到ZLG/SD的版本号 Function: get the version of ZLG/SD
** 输 入: 无 Input: NULL
** 输 出: 版本号 Output: Version
** 版本记录:
V1.0 支持访问SD 卡,只能在前后台系统运行
V2.0 支持访问SD和MMC卡,可运行于前后系统或UCOS-II
*******************************************************************************************************************/
INT16U SD_GetZLGSDVer(void)
{
return 0x0200; /* 版本号为 2.00 */
}