/*
    ANY-LICENSE V1.0
    ----------------

    You can use these files under any license approved by the
    Open Source Initiative, preferrably one of the popular licenses,
    as long as the license you choose is compatible to the
    dependencies of these files.

    See http://www.opensource.org/licenses/ for a list of
    approved licenses.

    Author:     Martin Furter <mf@borg.ch>
    Project:    Tins AVR Lib
    Repository: http://repos.borg.ch/projects/tins_avr_lib/trunk
    Copyright:  2015
*/

#include <tal/prng.h>

static uint16_t xorshift16_state;

void xorshift16_init( uint16_t state )
{
	xorshift16_state = state;
}

void xorshift16_add( uint16_t value )
{
	xorshift16_state += value;
}

uint8_t xorshift16_next()
{
	// xorshift 16 bit
	register uint16_t tmp = xorshift16_state;
    tmp ^= tmp << 13;
    tmp ^= tmp >> 9;
    tmp ^= tmp << 7;
	xorshift16_state = tmp;
	return tmp;
}

uint16_t xorshift16_get_state()
{
	return xorshift16_state;
}