SD卡读写速度

发表于 2009-9-1 22:46

香主，我跑ST的mass_storage例程，测试了下用TF卡做U盘的速度，才300kB/s左右，太慢了，达不到实际应用，分析了下，好像是sdio操作太慢，有没有方法提高sdio操作速度的方法呢？

发表于 2009-9-2 10:41

我的实验结果是： MicroSD 卡 4bits总线，写入8KBytes 需要 2-4ms 取决于卡的质量。
对应的速度为 4M~2MKBytes/s

发表于 2009-9-2 19:13

ls能不能传授下绝技？或者给个联系方式，交个朋友啊，我被这个问题困惑了好久了！

发表于 2009-9-3 09:06

Read TEST ............................................................................

  --------------------------

Card Detection OK!

Card information OK!
card size=1019215872 Bytes
Card Selection OK!

Set SD Mode OK!

Set DMA Mode OK!

Read File 10672072 bufsize=512
Read bufsize=512  10672072/7577992 =  1.408 MB/S

Read File 10672072 bufsize=1024
Read bufsize=1024  10672072/4273545 =  2.497 MB/S

Read File 10672072 bufsize=2048
Read bufsize=2048  10672072/2604225 =  4.098 MB/S

Read File 10672072 bufsize=4096
Read bufsize=4096  10672072/1801998 =  5.922 MB/S

Read File 10672072 bufsize=8192
Read bufsize=8192  10672072/1796841 =  5.939 MB/S

Read File 10672072 bufsize=16384
Read bufsize=16384  10672072/1794441 =  5.947 MB/S

FatFS Test OK!

Write TEST ............................................................................

  --------------------------

Card Detection OK!

Card information OK!
card size=1019215872 Bytes
Card Selection OK!

Set SD Mode OK!

Set DMA Mode OK!

Create File OK!
Read/Write bufsize=512  4194304/24955691 =  0.168 MB/S

Create File OK!
Read/Write bufsize=1024  4194304/11469412 =  0.366 MB/S

Create File OK!
Read/Write bufsize=2048  4194304/2887282 =  1.453 MB/S

Create File OK!
Read/Write bufsize=4096  4194304/1712439 =  2.449 MB/S

Create File OK!
Read/Write bufsize=8192  4194304/1717044 =  2.443 MB/S

Create File OK!
Read/Write bufsize=16384  4194304/1720713 =  2.438 MB/S

FatFS Test OK!

发表于 2009-9-3 10:21

呵呵，ls的都是一些调试信息，我这些也都是设置成功了的，但是速度还是上不去啊，我用PC读我的1G的TF卡，速度有3~4M/s，说明这张卡可以不是慢卡，但是用ST的例程跑就变得好慢了，我还是用SDIO 4bit DMA模式，倒底时间消耗在哪里一时还找不到方向，希望各位大侠能指点一下方向

发表于 2009-9-3 13:20

自己顶一下

发表于 2009-9-3 20:29

我也想知道答案哦，看来很多人都遇到了这个问题啊，支持lz一下！

发表于 2009-9-3 20:50

以前好像实验SPI口,扇区(512字节)读是360us,SCK=36MHz，其中前部分有从15us起到195us一直在反复查询SD卡对块读命令的响应。SDIO没试过

发表于 2009-9-4 09:10

ls能不能传授下绝技？或者给个联系方式，交个朋友啊，我被这个问题困惑了好久了！
beety 发表于 2009-9-2 19:13

你每次写入的扇区有多少？如果太少，开销会大很多

发表于 2009-9-4 16:25

没次扇区操作是512，每秒操作是330kB，太慢了吧

发表于 2009-9-4 16:59

fAST？
1.SDIO (4BIT MODE.)
2. DMA.
3. BLOCK MODE(SD_ReadMultiBlocks/SD_WriteMultiBlocks)

Read File 10672072 bufsize=512
Read bufsize=512  10672072/7577992 =  1.408 MB/S

Read File 10672072 bufsize=1024
Read bufsize=1024  10672072/4273545 =  2.497 MB/S

Read File 10672072 bufsize=2048
Read bufsize=2048  10672072/2604225 =  4.098 MB/S

Read File 10672072 bufsize=4096
Read bufsize=4096  10672072/1801998 =  5.922 MB/S

Read File 10672072 bufsize=8192
Read bufsize=8192  10672072/1796841 =  5.939 MB/S

Read File 10672072 bufsize=16384
Read bufsize=16384  10672072/1794441 =  5.947 MB/S

发表于 2009-9-4 19:17

我是用USB+TF卡操作FAT32 DMA4bit 速度330k/s，哪一块操作会消耗那么多时间呢？LS能不能贴点SDWriteBlock或者SDReadBlock的源码出来啊，DMA模式的，先谢了，或者加我QQ: 1069871108，我们私聊下也好！

发表于 2009-9-5 10:15

期待中。。。

发表于 2009-9-5 11:48

几点建议：

  1.  每次写入多个扇区，可以大大提高速度, 11楼的例子就说明了这个问题。
  2.  MicroSD卡的质量有些不同, 比如KingStone 的卡，一般写入时间3-4ms (For 8KByte)，但是有时会突然需要180ms 的时间, 程序设计需要考虑这个现象。最直接的办法是加大缓冲区, 延长写入间隔。
  3. SanDisk的性能要好一些,中间不会出现某些写入时间过长的现象, Toshiba 和 KingStone 是一样的品牌.

联系邮箱:  seawwh@sina.com

发表于 2009-9-5 12:25

标志一下好东西···

发表于 2009-9-5 15:41

有两个问题想确认一下，你们是不是都是在用ST公司提供的库函数下测得的，因为我现在不敢肯定是不是ST提供的库没有优化才导致TF卡读写速度慢，还是说我的卡比较慢，按道理说我的卡不会慢的，虽然不是KingStone、Toshiba等品牌的卡，但是在PC上的速度也达到了3~4M/s ，我把我的读写函数贴出来，请高手们看看哪里需要修改的地方：

发表于 2009-9-5 15:43

SD_Error SD_WriteBlock(u32 addr, u32 *writebuff, u16 BlockSize)
{
  SD_Error errorstatus = SD_OK;
  u8  power = 0, cardstate = 0;
  u32 timeout = 0, bytestransferred = 0;
  u32 cardstatus = 0, count = 0, restwords = 0;
  u32 *tempbuff = writebuff;

  if (writebuff == NULL)
  {
errorstatus = SD_INVALID_PARAMETER;
return(errorstatus);
  }

  TransferError = SD_OK;
  TransferEnd = 0;
  TotalNumberOfBytes = 0;

  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = 0;
  SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_512b;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Disable;
  SDIO_DataConfig(&SDIO_DataInitStructure);
  SDIO_DMACmd(DISABLE);

  if (SDIO_GetResponse(SDIO_RESP1) & SD_CARD_LOCKED)
  {
errorstatus = SD_LOCK_UNLOCK_FAILED;
return(errorstatus);
  }

  if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
  {
BlockSize = 512;
addr /= 512;
  }

  /* Set the block size, both on controller and card */
  if ((BlockSize > 0) && (BlockSize <= 2048) && ((BlockSize & (BlockSize - 1)) == 0))
  {
power = convert_from_bytes_to_power_of_two(BlockSize);

SDIO_CmdInitStructure.SDIO_Argument = (u32) BlockSize;
SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_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(SDIO_SET_BLOCKLEN);

if (errorstatus != SD_OK)
{
   return(errorstatus);
}
  }
  else
  {
errorstatus = SD_INVALID_PARAMETER;
return(errorstatus);
  }

  /* Wait till card is ready for data Added */
  SDIO_CmdInitStructure.SDIO_Argument = (u32) (RCA << 16);
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_STATUS;
  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(SDIO_SEND_STATUS);

  if (errorstatus != SD_OK)
  {
return(errorstatus);
  }

  cardstatus = SDIO_GetResponse(SDIO_RESP1);

  timeout = SD_DATATIMEOUT;

  while (((cardstatus & 0x00000100) == 0) && (timeout > 0))
  {
timeout--;
SDIO_CmdInitStructure.SDIO_Argument = (u32) (RCA << 16);
SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_STATUS;
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(SDIO_SEND_STATUS);

if (errorstatus != SD_OK)
{
   return(errorstatus);
}
cardstatus = SDIO_GetResponse(SDIO_RESP1);
  }

  if (timeout == 0)
  {
return(SD_ERROR);
  }

  /* Send CMD24 WRITE_SINGLE_BLOCK */
  SDIO_CmdInitStructure.SDIO_Argument = addr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_WRITE_SINGLE_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(SDIO_WRITE_SINGLE_BLOCK);

  if (errorstatus != SD_OK)
  {
return(errorstatus);
  }

  TotalNumberOfBytes = BlockSize;
  StopCondition = 0;
  SrcBuffer = writebuff;

  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = BlockSize;
  SDIO_DataInitStructure.SDIO_DataBlockSize = (u32) power << 4;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
  SDIO_DataConfig(&SDIO_DataInitStructure);

  if (DeviceMode == SD_DMA_MODE)
  {
SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_TXUNDERR | SDIO_IT_STBITERR, ENABLE);
DMA_TxConfiguration(writebuff, BlockSize);
SDIO_DMACmd(ENABLE);
while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
{}

  }

  /* Clear all the static flags */
  SDIO_ClearFlag(SDIO_STATIC_FLAGS);

  /* Wait till the card is in programming state */
  errorstatus = IsCardProgramming(&cardstate);

  while ((errorstatus == SD_OK) && ((cardstate == SD_CARD_PROGRAMMING) || (cardstate == SD_CARD_RECEIVING)))
  {
errorstatus = IsCardProgramming(&cardstate);
  }

  return(errorstatus);
}

发表于 2009-9-5 15:45

SD_Error SD_ReadBlock(u32 addr, u32 *readbuff, u16 BlockSize)
{
  SD_Error errorstatus = SD_OK;
  u32 count = 0, *tempbuff = readbuff;
  u8 power = 0;

  if (NULL == readbuff)
  {
errorstatus = SD_INVALID_PARAMETER;
return(errorstatus);
  }

  TransferError = SD_OK;
  TransferEnd = 0;
  TotalNumberOfBytes = 0;

  /* Clear all DPSM configuration */
  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = 0;
  SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_1b;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Disable;
  SDIO_DataConfig(&SDIO_DataInitStructure);
  SDIO_DMACmd(DISABLE);

  if (SDIO_GetResponse(SDIO_RESP1) & SD_CARD_LOCKED)
  {
errorstatus = SD_LOCK_UNLOCK_FAILED;
return(errorstatus);
  }

  if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
  {
BlockSize = 512;
addr /= 512;
  }
  if ((BlockSize > 0) && (BlockSize <= 2048) && ((BlockSize & (BlockSize - 1)) == 0))
  {
power = convert_from_bytes_to_power_of_two(BlockSize);

/* Set Block Size for Card */
SDIO_CmdInitStructure.SDIO_Argument = (u32) BlockSize;
SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_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(SDIO_SET_BLOCKLEN);

if (SD_OK != errorstatus)
{
   return(errorstatus);
}
  }
  else
  {
errorstatus = SD_INVALID_PARAMETER;
return(errorstatus);
  }

  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = BlockSize;
  SDIO_DataInitStructure.SDIO_DataBlockSize = (u32) power << 4;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToSDIO;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
  SDIO_DataConfig(&SDIO_DataInitStructure);

  TotalNumberOfBytes = BlockSize;
  StopCondition = 0;
  DestBuffer = readbuff;

  /* Send CMD17 READ_SINGLE_BLOCK */
  SDIO_CmdInitStructure.SDIO_Argument = (u32)addr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_READ_SINGLE_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(SDIO_READ_SINGLE_BLOCK);

  if (errorstatus != SD_OK)
  {
return(errorstatus);
  }

  if (DeviceMode == SD_DMA_MODE)
  {
SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_STBITERR, ENABLE);
SDIO_DMACmd(ENABLE);
DMA_RxConfiguration(readbuff, BlockSize);
while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
{}
  }
  return(errorstatus);
}

发表于 2009-9-6 01:30

本帖最后由 wjc3k 于 2009-9-6 01:51 编辑

here is function for FATFS.  ( ST SDCARD.C ,Sandisk 1GB DMA:24M)

/*-----------------------------------------------------------------------*/
/* Read Sector(s)                                                       */
#define MULTI_BLOCK

#define MAX_BLOCK_SIZE 512
DRESULT disk_read (
      BYTE drv,             /* Physical drive nmuber (0..) */
      BYTE *buff,             /* Data buffer to store read data */
      DWORD sector,       /* Sector address (LBA) */
      BYTE count             /* Number of sectors to read (1..255) */
)
{
      u32 *pbuf=(u32 *)(buff);
      SD_Error err;
//       u8 c;

#ifdef MULTI_BLOCK
      if( count == 1 )
            err = SD_ReadBlock(sector*S_MAX_SIZ,(u32 *)pbuf,MAX_BLOCK_SIZE);
      else
      {
            err = SD_ReadMultiBlocks(sector*S_MAX_SIZ, (u32 *)pbuf, MAX_BLOCK_SIZE, count);
      }
      if( err != SD_OK ) return( RES_ERROR);
#else
      while(count--)
      {
            err = SD_ReadBlock(sector*S_MAX_SIZ,(u32 *)pbuf,MAX_BLOCK_SIZE);
            if( err != SD_OK ) return( RES_ERROR);
            pbuf+=(MAX_BLOCK_SIZE>>2);
            sector++;
      }
#endif
      return(RES_OK);
}

/*-----------------------------------------------------------------------*/
/* Write Sector(s)                                                    */

#if _READONLY == 0
DRESULT disk_write (
      BYTE drv,                      /* Physical drive nmuber (0..) */
      const BYTE *buff,       /* Data to be written */
      DWORD sector,             /* Sector address (LBA) */
      BYTE count                      /* Number of sectors to write (1..255) */
)
{
      u32 *pbuf=(u32 *)(buff);
      SD_Error err;

#ifdef MULTI_BLOCK
      if( count == 1 )
            err = SD_WriteBlock(sector*S_MAX_SIZ,(u32 *)pbuf,MAX_BLOCK_SIZE);
      else
            err = SD_WriteMultiBlocks(sector*S_MAX_SIZ, (u32 *)pbuf, MAX_BLOCK_SIZE, count);

      if( err != SD_OK )
      {
            printf("Write Blocks:%d %d Failed!\r\n",sector,count);
            return( RES_ERROR);
      }

#else
      while(count--)
      {
      err = SD_WriteBlock(sector*S_MAX_SIZ, (u32 *)pbuf, MAX_BLOCK_SIZE);
            if( err != SD_OK ) return( RES_ERROR);
            pbuf+=(MAX_BLOCK_SIZE>>2);
            sector++;
      }
#endif
      return(RES_OK);
}
#endif /* _READONLY */

发表于 2009-9-6 17:22

LS的代码只是上层的调用，对于提高速度没有帮助，我简化了读写操作，读的操作提高了些，可以达到650k/s，但是写的速度还是上不去，我把代码贴出来，高手们能不能帮我分析下，还可以如何优化代码，提高速度：
SD_Error SD_ReadBlock(u32 addr, u32 *readbuff, u16 BlockSize)
{
  SD_Error errorstatus = SD_OK;
  u8 power = 0;
SDIO_CmdInitTypeDef SDIO_CmdInitStructure;
SDIO_DataInitTypeDef SDIO_DataInitStructure;

  if (NULL == readbuff)
  {
errorstatus = SD_INVALID_PARAMETER;
return(errorstatus);
  }
power = 9;

SDIO_CmdInitStructure.SDIO_Argument = (u32) BlockSize;
SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_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(SDIO_SET_BLOCKLEN);

if (SD_OK != errorstatus)
{
   return(errorstatus);
}
  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = BlockSize;
  SDIO_DataInitStructure.SDIO_DataBlockSize = (u32) power << 4;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToSDIO;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
  SDIO_DataConfig(&SDIO_DataInitStructure);
  /* Send CMD17 READ_SINGLE_BLOCK */
  SDIO_CmdInitStructure.SDIO_Argument = (u32)addr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_READ_SINGLE_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(SDIO_READ_SINGLE_BLOCK);

  if (errorstatus != SD_OK)
  {
return(errorstatus);
  }
SDIO_DMACmd(ENABLE);
DMA_RxConfiguration(readbuff, BlockSize);
while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
{}
  return(errorstatus);
  }
SD_Error SD_WriteBlock(u32 addr, u32 *writebuff, u16 BlockSize)
{
  SD_Error errorstatus = SD_OK;
  u8  power = 0, cardstate = 0;
SDIO_CmdInitTypeDef SDIO_CmdInitStructure;
SDIO_DataInitTypeDef SDIO_DataInitStructure;

  if (writebuff == NULL)
  {
errorstatus = SD_INVALID_PARAMETER;
return(errorstatus);
  }
power = 9;
SDIO_CmdInitStructure.SDIO_Argument = (u32) BlockSize;
SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_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(SDIO_SET_BLOCKLEN);

if (errorstatus != SD_OK)
{
   return(errorstatus);
}

  /* Wait till card is ready for data Added */
  SDIO_CmdInitStructure.SDIO_Argument = (u32) (RCA << 16);
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_STATUS;
  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(SDIO_SEND_STATUS);

  if (errorstatus != SD_OK)
  {
return(errorstatus);
  }

//  cardstatus = SDIO_GetResponse(SDIO_RESP1);

  /* Send CMD24 WRITE_SINGLE_BLOCK */
  SDIO_CmdInitStructure.SDIO_Argument = addr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_WRITE_SINGLE_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(SDIO_WRITE_SINGLE_BLOCK);

  if (errorstatus != SD_OK)
  {
return(errorstatus);
  }

  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = BlockSize;
  SDIO_DataInitStructure.SDIO_DataBlockSize = (u32) power << 4;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
  SDIO_DataConfig(&SDIO_DataInitStructure);

SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_TXUNDERR | SDIO_IT_STBITERR, ENABLE);
DMA_TxConfiguration(writebuff, BlockSize);
SDIO_DMACmd(ENABLE);
while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
{}

  /* Clear all the static flags */
  SDIO_ClearFlag(SDIO_STATIC_FLAGS);

  errorstatus = IsCardProgramming(&cardstate);
  while ((errorstatus == SD_OK) && ((cardstate == SD_CARD_PROGRAMMING) || (cardstate == SD_CARD_RECEIVING)))
  {
errorstatus = IsCardProgramming(&cardstate);
  }
  return(errorstatus);
}

[应用相关] SD卡读写速度

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技术新星奖章

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