Problem in initialization of micro sd card(16GB)

Can anybody please tell me what does 'x' corresponds to in CRC7 calculation? section 4.5

Generator polynomial: G(x) = x^7+ x^3+ 1.

M(x) = (first bit) * x^n+ (second bit) * x^n-1+...+ (last bit) * x^0

CRC[6...0] = Remainder [(M(x) * x^7)/G(x)]

I am facing problem in getting initialization of sandisk 16GB micro sd card. I want to know CRC value of CMD55 & ACMD41 in mmcSendCmd(0x69,0x00,0xff);  

thanks

Thanks David for taking care into the post.
As i had mentioned in my first post, I am not using any MSP430 based HW. In stead i am using customized CC2541 readymade module. I have ported similar to MSP430 registers. If i use 2GB micro sd card then i am able to write and read data correctly but 16GB micro sd card is not getting initialized. I am not getting 0x00 response for ACMD41 command while using 16GB card although i am following the procedure for sd card initialization discussed in lots of e2e forums and google also. I doubt if crc sequence is correct. I always get "response = 0xff" as response for ACMD41 for
while(response!=0x00)
{
.
.
} and it becomes infinite loop

Hi Kumar,

kumar singh said:

1)Thanks for providing reference of sample code example for MP430 but that doesn't include any example code for sd card interfacing. I can't find any such example in your referred link.

I think it will be easier if you download the UE demo from here:

http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP-EXP430F5529/latest/index_FDS.html

kumar singh said:

2)Did you had test for interfacing 16GB sd card without using file system?

For the 16 GB sd card, I've only used the FS in the UE Demo. At the same time I'm wondering if you have seen this App Note  - MSP with SD: http://www.ti.com/.../slaa281b.pdf

 Please let me know if this is the code that you are having problems with.

 Thanks,

  David

Hi Kumar,

I'm trying to get SD card running with CC2541. I've problem in intialization. I have setup SPI USART1 Alternate 2 function as follows.

void SPI_init(uint8 baud_E, uint8 baud_M)
{

/****************************************************************************
*
* Port pins used by USART 1 Alt 2 operating in SPI mode are
* MISO = P1_7
* MOSI = P1_6
* SCK = P1_5
* SSN = P1_4
* Set SPI Mode 0 or 3 according to Chan's guide

*/

//*** Configure USART 1 SPI at alternate location 2 ***
/* IO Port PERCFG Register
* 7 = Reserved
* 6 = T1CFG = 0
* 5 = T3CFG = 0
* 4 = T4CFG = 0
* 3:2= Reserved
* 1 = U1CFG = 1
* 0 = U0CFG = 0
*/
PERCFG |= 0x02;

// Peripheral function on SCK, MISO and MOSI (P1_5-7)
P1SEL = 0xE0;

// Configure CS (P1_4) as output
P1DIR |= 0x10;
CS = CS_DISABLED; /*CS_DISABLED =1*/

/* Give UART1 priority over Timer3. */
//P2SEL &= ~0x20;

//*** Setup the SPI interface ***
U1CSR = 0x00; // USART 1 = SPI master mode. SD card is slave

// Negative clock polarity, Phase: data out on CPOL -> CPOL-inv
// data in on CPOL-inv -> CPOL
// MSB first
U1GCR = 0x20;

// SCK frequency = 230KHz
// Put decimal values in formula for baud rate generation and you will get around 230KHz
U1GCR |= baud_E; // 0x0C; // BAUD_E XXX_ ____ 4:0 Decimal = 12
U1BAUD = baud_M; // 0xD8; // BAUD_M 7:0 Decimal = 216

/* SCK frequency = 307.617 KHz
U1GCR |= 0x0D; // BE =13
U1BAUD = 0x3B; // BM =59
*/

/*
WAIT_1MS();
WAIT_1MS();
*/
//acc_initialized = TRUE;
}

and the SDInit function is as follows

BYTE SDInit()
{
unsigned int CardStatus; // R2 value from status inquiry
unsigned int Count;
uint8 CardType;
BYTE response = 0x00;

/* Setup SPI mostly with 400KHz*/
SPI_init(0x0C, 0xD8); // 230KHz

/* Disable CS */
CS = CS_ENABLED;

/* fill send data with all ones - 80 bits long to */
/* establish link with SD card this fulfills the */
/* 74 clock cycle requirement... */
for(Count=0;Count<10;Count++)
spiWriteByte(0xFF);

/* Enable CS */
// CS = CS_ENABLED; /* Enable = 0 meaning selecting the SD card*/

// This count represents one second. So We will try for one second to enter into ideal mode.
Count = 1000;

/* Set SD card in IDLE Mode */
// Send a CMD0 with CS low to reset the card
do
{
//WAIT_1MS();
SD_Command( CMD_GO_IDLE_STATE, 0 );
response = SD_GetR1();

} while((response != 0x00)); // Removed Count, will loop forever untill i get 00

CardType = 0;
/*
SD_Command(IDLE,0);
if (SD_GetR1() != 0x01)
return Success;
*/


/* timeout if we never made it to IDLE state...
if( !Count )
return( SD_TIME_OUT );*/

/* Initialization */
Count = 2000; // two seconds...
SD_Command( ACMD_SEND_OP_COND, 0 );

if( SD_GetR1() <= 1 )
{
CardType = 2;
}
else
{
CardType = 1;
}

/* wait for initialization to finish... */
do
{
//Delay(1);
if( CardType == 2 )
{
SD_Command( CMD_APP_CMD, 0 );
SD_Command( ACMD_SEND_OP_COND, 0 );
}
else
{
SD_Command( CMD_SEND_OP_COND, 0 );
}
} while(SD_GetR1() && --Count);

/*
if( !Count )
return( SD_TIME_OUT ); */

/* QUERY CARD STATUS...*/
SD_Command( CMD_SEND_STATUS, 0 );
CardStatus = SD_GetR2();

if( CardStatus )
return( 1 );

/* SET BLOCK SIZE... */
SD_Command( CMD_SET_BLOCKLEN, 512 );

/* Switch to higher SPI speed*/

/* Disable the card */
CS = CS_DISABLED;

return(0); // Success
}

I'm always getting 0x01 response. I'm using SDHC card of 4 GB. Any suggestions.