Texas Instruments CC3235 SimpleLink Series - Card Types

www.ti.com Initialization and Configuration Using Peripheral APIs
369
SWRU543–January 2019
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SD Host Controller Interface
11.4.5 Block Write
The code that follows shows a block write using peripheral APIs:
Unsigned long CardWriteBlock(CardAttrib_t *Card, unsigned char *pBuffer,
unsigned long ulBlockNo, unsigned long ulBlockCount)
{
unsigned long ulSize;
unsigned long ulBlkIndx;
ulBlockCount = ulBlockCount + ulBlockNo;
for(ulBlkIndx = ulBlockNo; ulBlkIndx
<ulBlockCount; ulBlkIndx++)
{
ulSize = 128;
if(Card->ulCapClass == CARD_CAP_CLASS_SDSC)
{
ulBlockNo = ulBlkIndx * 512;
}
if( SendCmd(CMD_WRITE_SINGLE_BLK, ulBlockNo) == 0 )
{
// Write the data
while(ulSize--)
{
SDHostDataWrite(SDHOST_BASE,*((unsigned long *)pBuffer));
pBuffer+=4;
}
// Wait for transfer completion.
while( !(SDHostIntStatus(SDHOST_BASE)
&amp;SDHOST_INT_TC) );
}
else
{
return 1;
}
}
// Return error
return 0;
}
11.5 Performance and Testing
The APIs discussed in the preceding sections were tested using the cards types listed in Table 11-1:
Table 11-1. Card Types
Vendor Size Capacity Class Block Read/Write Comments
Transcend 2GB SDSC Passed
Transcend 16GB SDHC Passed
Strontium 2GB SDSC Passed