/* Clear the slave select pins of the specified SPI port. 
The  */
void SPISSClear(unsigned long ulBase, unsigned long ulSlaveSel)
/* Clear the slave select pins of the specified SPI port. 
The  */
void SPISSClear(unsigned long ulBase, unsigned long ulSlaveSel)
{
    xASSERT((ulBase == SPI0_BASE) || (ulBase == SPI1_BASE));
    xASSERT((ulSlaveSel == SPI_SS_NONE) || (ulSlaveSel == SPI_SS0));
    xHWREG(ulBase + SPI_SSR) &= ~ulSlaveSel;
}