spi.c

基于c51的SD驱动程序,在FAT32文件系统中.

void SPI8Clocks  (  unsigned char  nClocks   )   
{
    while (nClocks--)
	{
    SPIPutCharWithoutWaiting(0xff);
    SPIWait();
    }
}

unsigned char SPIGetChar  (void)   
{
    SPIPutCharWithoutWaiting(0xff); /* send 0xff */
    SPIWait(); /* wait for the byte to transfer */
    return SPI_RESULT_BYTE; /* Return the received byte */
}