HELP!How to initialiazation the SD via SPI with CC2430?

[telly270]

I am attempting to read/write files to a SD card via SPI mode with CC2430.
But I can't initialiazation it successfully now.
When i send the command 0 to SD card,no response receiveed but 0xFF.
The expect response is 0x01.
And I find that the SPI_Init() has something wrong.But I don't know how to modity it.

I hope every advice.

CC2430: UASRT1,SPI,master,Alt.1

void SPI_Init(void) // Initialize and enable the SPI mode
{
P0SEL =0xFB; // Setup P0 for SPI mode
P0DIR =0xDF; // Setup P0.2~P0.5 as spi interface

PERCFG=0x00; // UASRT1,SPI,Alt.1,master
P2DIR =0X40;
P2SEL =0X40;

U1CSR =0x40; // Enable SPI

U1GCR =0x31; //Set baudrate F/8=4MHz(F=32MHz)，
//CPOL=0,CPHA=0,MSB first
U1BAUD=0x00;
}


unsigned char SD_ResetSD(void)
{
unsigned char param[4] = {0x00,0x00,0x00,0x00},resp;
return (SD_SendCmd(CMD0, param, CMD0_R, &resp));
}

unsigned char SD_SendCmd(unsigned char cmd,unsigned char *param,
unsigned char resptype,unsigned char *resp)
{
unsigned char i,rlen;
unsigned char tmp;

SPI_CS_Assert();
SPI_SendByte((cmd & 0x3F) | 0x40);

for(i=0;i<4;i++)
{
SPI_SendByte(param[3-i]); //send parameters
}
SPI_SendByte(0x95); // send CRC
SPI_SendByte(0xFF); // 8 clocks
rlen = 0;
switch (resptype)
{
case R1:
case R1B: rlen = 1; break;
case R2: rlen = 2; break;
case R3: rlen = 5; break;
default: break;
}
i = 0;
do
{
tmp = SPI_RecByte();

i++;
}
while (((tmp & 0x80) != 0) && (i < SD_CMD_TIMEOUT));
//SD_CMD_TIMEOUT=100.

if (i >= SD_CMD_TIMEOUT)
{
SPI_CS_Deassert();
SPI_SendByte(0xFF);
return SD_ERR_CMD_TIMEOUT; //SD_ERR_CMD_TIMEOUT=0x11.
}

for (i = rlen - 1; i >= 0; i--)
{
resp = tmp;
tmp = SPI_RecByte();
}
P1_0=0;
SPI_CS_Deassert();
SPI_SendByte(0xFF);
return SD_NO_ERR;
}

unsigned char SD_Initialize(void)
{
unsigned char recbuf[4],ret;

SPI_Init();

SPI_Clk400k();

SPI_CS_Deassert();
SD_SPIDelay(10);

ret = SD_ResetSD();
if (ret != SD_NO_ERR)
return ret;
ret = SD_ActiveInit();

if (ret != SD_NO_ERR)
return ret;

ret = SD_ReadOCR(4, recbuf);
if (ret != SD_NO_ERR)
return ret;

if ((recbuf[1] & MSK_OCR_33) != MSK_OCR_33) //MSK_OCR_33=0xC0
return SD_ERR_VOL_NOTSUSP;//SD_ERR_VOL_NOTSUSP=0x04

SPI_ClkToMax();

ret = SD_SetBlockLen(SD_BLOCKSIZE);
if (ret != SD_NO_ERR)
return ret;

return SD_NO_ERR;
}