SD card Lock/Unlock example

[donev_g]

Posted on November 22, 2013 at 14:27

Hi All,

Does anybody have an example how to lock/unlock SD card using SDIO and CMD42?

[Tesla DeLorean]

Posted on November 22, 2013 at 16:54

Does anybody have an example how to lock/unlock SD card using SDIO and CMD42?

No, but I might entertain an offer, or bounty for such.

[SPasz]

Do you have working code example Clive?

[Tesla DeLorean]

Nothing recent, I've done it with ATA devices previously.

What STM32 platform? What generation of cards or chips?

I personally prefer end-to-end encryption, it is less open to broken/compromised implementation, and government interference.

[donev_g]

Posted on November 22, 2013 at 17:34

Thanks clive!

[donev_g]

Posted on November 27, 2013 at 17:07

Here is my code, if somebody can help:

void SD_SetPDW_Test(void){

SD_Error x = SD_Init();

     errorstatus = SD_GetCardStatus(&cardstatus);

     SDIO_CmdInitStructure.SDIO_Argument = 10;

     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);

   SDIO_CmdInitStructure.SDIO_Argument = 0;

   SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_LOCK_UNLOCK;

   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);

     SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;

     SDIO_DataInitStructure.SDIO_DataLength = 11;

     SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_16b; //SDIO_DataBlockSize_16b;

     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);

 memset(tmp_buff, 0, 64);

 

 memcpy(&(tmp_buff[3]), passw, sizeof(passw));

 

 uint8_t csCalc[10] = {SD_SET_PWD_SDIO | SD_LOCK_UNLOCK_SDIO, 6, 'A', 'D' , '3', '2', '4', 'Z', 0x65, 0x41 }; //password is AD324Z and the checksum CRC/CCIT(16 bit) is 0x4165

   SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_STBITERR, ENABLE);

   SD_LowLevel_DMA_TxConfig((uint32_t *)csCalc, 10);

   SDIO_DMACmd(ENABLE);

   errorstatus = CmdResp1Error(SD_CMD_LOCK_UNLOCK); //here the status is SD_OK

   errorstatus = SD_GetCardStatus(&cardstatus); //here the status is SD_OK but probably should be SD_LOCKED

  

  } At the end SD card status returns SD_OK but I think that it should be SD_LOCKED. And the SD card is not locked.