void spi_init(void)
{
  SPCTL = 0xD7;// configure SPI
 
  mspibusy = 0;// SPI initially not busy
  
  IP1 &= ~0x08;	// set SPI interrupt priority to 0
  IP1H &= ~0x08;

  ESPI = 1;	    // enable SPI interrupt
} // spi_init