SSP-Datentransfer Fifo

/* Send multiple byte */

static

void xmit_spi_multi (

  const BYTE *buff,  /* Pointer to the data */

  UINT btx      /* Number of bytes to send (512) */

)

{

  UINT n = 512;

  WORD d;

  SSPxCR0 = 0x000F;      /* Select 16-bit mode */

  for (n = 0; n < 8; n++) {  /* Push 8 frames into pipeline  */

    d = *buff++;

    d = (d << 8) | *buff++;

    SSPxDR = d;

  }

  btx -= 16;

  do {            /* Transmit data block */

    d = *buff++;

    d = (d << 8) | *buff++;

    while (!(SSPxSR & _BV(2))) ;

    SSPxDR; SSPxDR = d;

  } while (btx -= 2);

  for (n = 0; n < 8; n++) {

    while (!(SSPxSR & _BV(2))) ;

    SSPxDR;

  }

  SSPxCR0 = 0x0007;      /* Select 8-bit mode */

}