关于SDIO POLLING模式驱动：SD_WriteMultiBlocks函数写入时间长

2019-07-20 15:34发布

问题发现：写入1024Bytes，f_write(file, Sd_write_buf, 1024, &_cnt);
            测试发现要花费4~5ms的时间。我修改了SD_WriteMultiBlocks函数，把write_ms_delta打印出来看发现的。
            那部分代码应该是等待TF卡反馈写入完成。
问题：有没有办法把这部分时间给省略掉呢？假如频繁写入的话(1秒钟100次)，那么系统基本就没办法做其它事情了。

//SD卡写多个块
//buf:数据缓存区
//addr:写地址
//blksize:块大小
//nblks:要写入的块数
//返回值:错误状态
SD_Error SD_WriteMultiBlocks(u8 *buf,long long addr,u16 blksize,u32 nblks)
{
SD_Error errorstatus = SD_OK;
u8  power = 0, cardstate = 0;
u32 timeout=0,bytestransferred=0;
u32 count = 0, restwords = 0;
u32 tlen=nblks*blksize; //总长度(字节)
u32 *tempbuff = (u32*)buf;
  if(buf==NULL)return SD_INVALID_PARAMETER; //参数错误
  SDIO->DCTRL=0x0; //数据控制寄存器清零(关DMA)

SDIO_DataInitStructure.SDIO_DataBlockSize= 0; ; //清除DPSM状态机配置
SDIO_DataInitStructure.SDIO_DataLength= 0 ;
SDIO_DataInitStructure.SDIO_DataTimeOut=SD_DATATIMEOUT ;
SDIO_DataInitStructure.SDIO_DPSM=SDIO_DPSM_Enable;
SDIO_DataInitStructure.SDIO_TransferDir=SDIO_TransferDir_ToCard;
SDIO_DataInitStructure.SDIO_TransferMode=SDIO_TransferMode_Block;
  SDIO_DataConfig(&SDIO_DataInitStructure);

if(SDIO->RESP1&SD_CARD_LOCKED)return SD_LOCK_UNLOCK_FAILED;//卡锁了
if(CardType==SDIO_HIGH_CAPACITY_SD_CARD)//大容量卡
{
blksize=512;
addr>>=9;
}
if((blksize>0)&&(blksize<=2048)&&((blksize&(blksize-1))==0))
{
power=convert_from_bytes_to_power_of_two(blksize);

SDIO_CmdInitStructure.SDIO_Argument = blksize; //发送CMD16+设置数据长度为blksize,短响应
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SET_BLOCKLEN;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);

errorstatus=CmdResp1Error(SD_CMD_SET_BLOCKLEN); //等待R1响应

if(errorstatus!=SD_OK)return errorstatus;    //响应错误

}else return SD_INVALID_PARAMETER;
if(nblks>1)
{
if(nblks*blksize>SD_MAX_DATA_LENGTH)return SD_INVALID_PARAMETER;
     if((SDIO_STD_CAPACITY_SD_CARD_V1_1==CardType)||(SDIO_STD_CAPACITY_SD_CARD_V2_0==CardType)||(SDIO_HIGH_CAPACITY_SD_CARD==CardType))
{
//提高性能
SDIO_CmdInitStructure.SDIO_Argument = (u32)RCA<<16; //发送ACMD55,短响应
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_APP_CMD;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);

errorstatus=CmdResp1Error(SD_CMD_APP_CMD); //等待R1响应

if(errorstatus!=SD_OK)return errorstatus;

SDIO_CmdInitStructure.SDIO_Argument =nblks; //发送CMD23,设置块数量,短响应
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SET_BLOCK_COUNT;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);

errorstatus=CmdResp1Error(SD_CMD_SET_BLOCK_COUNT);//等待R1响应

if(errorstatus!=SD_OK)return errorstatus;

}

SDIO_CmdInitStructure.SDIO_Argument =addr; //发送CMD25,多块写指令,短响应
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_WRITE_MULT_BLOCK;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);

errorstatus=CmdResp1Error(SD_CMD_WRITE_MULT_BLOCK); //等待R1响应

if(errorstatus!=SD_OK)return errorstatus;

      SDIO_DataInitStructure.SDIO_DataBlockSize= power<<4; ; //blksize, 控制器到卡
SDIO_DataInitStructure.SDIO_DataLength= nblks*blksize ;
SDIO_DataInitStructure.SDIO_DataTimeOut=SD_DATATIMEOUT ;
SDIO_DataInitStructure.SDIO_DPSM=SDIO_DPSM_Enable;
SDIO_DataInitStructure.SDIO_TransferDir=SDIO_TransferDir_ToCard;
SDIO_DataInitStructure.SDIO_TransferMode=SDIO_TransferMode_Block;
SDIO_DataConfig(&SDIO_DataInitStructure);

if(DeviceMode==SD_POLLING_MODE)
      {
timeout=SDIO_DATATIMEOUT;
INTX_DISABLE();//关闭总中断(POLLING模式,严禁中断打断SDIO读写操作!!!)
while(!(SDIO->STA&((1<<4)|(1<<1)|(1<<8)|(1<<3)|(1<<9))))//下溢/CRC/数据结束/超时/起始位错误
{
if(SDIO_GetFlagStatus(SDIO_FLAG_TXFIFOHE) != RESET) //发送区半空,表示至少存了8字(32字节)
{
if((tlen-bytestransferred)<SD_HALFFIFOBYTES)//不够32字节了
{
restwords=((tlen-bytestransferred)%4==0)?((tlen-bytestransferred)/4)

(tlen-bytestransferred)/4+1);
for(count=0;count<restwords;count++,tempbuff++,bytestransferred+=4)
{
SDIO->FIFO=*tempbuff;
}
}else //发送区半空,可以发送至少8字(32字节)数据
{
for(count=0;count<SD_HALFFIFO;count++)
{
SDIO->FIFO=*(tempbuff+count);
}
tempbuff+=SD_HALFFIFO;
bytestransferred+=SD_HALFFIFOBYTES;
}
timeout=0X3FFFFFFF; //写数据溢出时间
}else
{
if(timeout==0)return SD_DATA_TIMEOUT;
timeout--;
}
}
if(SDIO_GetFlagStatus(SDIO_FLAG_DTIMEOUT) != RESET) //数据超时错误
{
     SDIO_ClearFlag(SDIO_FLAG_DTIMEOUT); //清错误标志
return SD_DATA_TIMEOUT;
     }else if(SDIO_GetFlagStatus(SDIO_FLAG_DCRCFAIL) != RESET) //数据块CRC错误
{
     SDIO_ClearFlag(SDIO_FLAG_DCRCFAIL);    //清错误标志
return SD_DATA_CRC_FAIL;
}else if(SDIO_GetFlagStatus(SDIO_FLAG_TXUNDERR) != RESET) //接收fifo下溢错误
{
     SDIO_ClearFlag(SDIO_FLAG_TXUNDERR); //清错误标志
return SD_TX_UNDERRUN;
}else if(SDIO_GetFlagStatus(SDIO_FLAG_STBITERR) != RESET) //接收起始位错误
{
     SDIO_ClearFlag(SDIO_FLAG_STBITERR);//清错误标志
return SD_START_BIT_ERR;
}

if(SDIO_GetFlagStatus(SDIO_FLAG_DATAEND) != RESET) //发送结束
{
if((SDIO_STD_CAPACITY_SD_CARD_V1_1==CardType)||(SDIO_STD_CAPACITY_SD_CARD_V2_0==CardType)||(SDIO_HIGH_CAPACITY_SD_CARD==CardType))
{
SDIO_CmdInitStructure.SDIO_Argument =0;//发送CMD12+结束传输
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_STOP_TRANSMISSION;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);

errorstatus=CmdResp1Error(SD_CMD_STOP_TRANSMISSION);//等待R1响应
if(errorstatus!=SD_OK)return errorstatus;
}
}
INTX_ENABLE();//开启总中断
     SDIO_ClearFlag(SDIO_STATIC_FLAGS);//清除所有标记
      }else if(DeviceMode==SD_DMA_MODE)
{
   TransferError=SD_OK;
StopCondition=1; //多块写,需要发送停止传输指令
TransferEnd=0; //传输结束标置位，在中断服务置1
SDIO->MASK|=(1<<1)|(1<<3)|(1<<8)|(1<<4)|(1<<9); //配置产生数据接收完成中断
SD_DMA_Config((u32*)buf,nblks*blksize,DMA_DIR_MemoryToPeripheral); //SDIO DMA配置
          SDIO->DCTRL|=1<<3; //SDIO DMA使能.
timeout=SDIO_DATATIMEOUT;
     while(((DMA2->LISR&(1<<27))==RESET)&&timeout)timeout--;//等待传输完成
if(timeout==0)      //超时
{
    SD_Init();      //重新初始化SD卡,可以解决写入死机的问题
     return SD_DATA_TIMEOUT; //超时
     }
timeout=SDIO_DATATIMEOUT;
while((TransferEnd==0)&&(TransferError==SD_OK)&&timeout)timeout--;
     if(timeout==0)return SD_DATA_TIMEOUT; //超时
     if(TransferError!=SD_OK)return TransferError;
}
    }
SDIO_ClearFlag(SDIO_STATIC_FLAGS);//清除所有标记
errorstatus=IsCardProgramming(&cardstate);
write_ms_start = GetSysTime_ms();// 开始时间
while((errorstatus==SD_OK)&&((cardstate==SD_CARD_PROGRAMMING)||(cardstate==SD_CARD_RECEIVING)))
{
errorstatus=IsCardProgramming(&cardstate);
}
write_ms_end = GetSysTime_ms();// 结束时间
write_ms_delta = write_ms_end - write_ms_start;// 时间差
return errorstatus;
}

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