Colony

#include <dragonfly_lib.h>

#include "spi.h"

static volatile char spi_bytes; /* number of bytes to read */

static spi_fun_recv_t spi_recv_func; /* byte handler */

static spi_fun_recv_complete_t spi_recv_complete_func; /*transmission completion handler */

void spi_init (spi_fun_recv_t recv_func, spi_fun_recv_complete_t recv_complete_func)

{

    /*  Enable Interrupt, Enable SPI Module, MSB First, Master Mode, Clock div = 64 */

    SPSR = _BV(SPI2X); 

    /* Set SCLK, SS, MOSI as outputs. MISO as input */

    DDRB &= ~MISO;

    /* Keep SS high until transmit */

    /* only handle intterupt when we are expecting data */

    if(spi_bytes > 0){

	/* process byte */

	/* if we've read all the bytes, set SS high to end transmission,

	 * otherwise get the next byte  */

	if(--spi_bytes == 0){

		//usb_puts("Read all bytes\r\n");

	    PORTB |= SS;

	}else {

		//usb_puts("There are this many bytes left: "); usb_puti(spi_bytes);usb_puts("\r\n");

	    SPDR = 0xff;