#ifdef ATMEGA32
#include <Mega32.h>
#define CI_LATCH 2
#elif defined(AT90S8515)
#include <90S8515.h>
#define CI_LATCH 2
#elif defined(ATMEGA8)
#include <Mega8.h>
#define CI_LATCH 1
#elif defined(ATMEGA48)
#include <Mega48.h>
#define CI_LATCH 1
#endif

#include "controller_input.h"

void controller_input_init(void)
{
    //Assuming SPI setup by LED driver.
    DDRB.CI_LATCH=1;//Set latch as output.
    PORTB.CI_LATCH=1;//Data latch active low (keep high).
}

unsigned char controller_input_get(void)
{
    PORTB.CI_LATCH=0;//Latch switches.

    SPDR=0xFF;//Output one byte to activate SPI input.
    while(!(SPSR&0x80));//Wait for transfer complete.

    PORTB.CI_LATCH=1;//Unlatch shift register.

    return ~SPDR;//Clear second SPIF flag and return input value.
}