Texas Instruments CC3235 SimpleLink Series - Page 367

www.ti.com Initialization and Configuration Using Peripheral APIs
367
SWRU543–January 2019
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SD Host Controller Interface
//
// Wait for card to become ready.
//
do
{
if( (ulRet = SendCmd(CMD_APP_CMD,0)) == 0 )
{
ulRet = SendCmd(CMD_SD_SEND_OP_COND,0x00E00000);
//
// Response contains 32-bit OCR register
//
SDHostRespGet(SDHOST_BASE,ulResp);
}
}while((ulRet == 0)
&&((ulResp[0] >>31) == 0));
//
// Check the response
//
if(ulRet == 0)
{
CardAttrib->ulCardType = CARD_TYPE_SDCARD;
}
else // CMD 55 is not recognised by SDHost cards.
{
//
// Confirm if its a SDHost card
//
ulRet = SendCmd(CMD_SEND_OP_COND,0);
if( ulRet == 0)
{
CardAttrib->ulCardType = CARD_TYPE_MMC;
}
}
}
}
//
// Get the RCA of the attached card
//
if(ulRet == 0)
{
ulRet = SendCmd(CMD_ALL_SEND_CID,0);
if( ulRet == 0)
{
SendCmd(CMD_SEND_REL_ADDR,0);
SDHostRespGet(SDHOST_BASE,ulResp);
//
// Fill in the RCA
//
CardAttrib->ulRCA = (ulResp[0]
>> 16);
//
// Get tha card capacity
//
CardAttrib->ullCapacity = CardCapacityGet(CardAttrib->ulRCA);
}
}
//
// return status.
//