/* Copyright 2016 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "gpio.h"
#include "timer.h"
#include "watchdog.h"
#include "cts_common.h"

/* Return SUCCESS if and only if we reach end of function
 * Returning success here means sync was successful
 */
enum cts_rc sync(void)
{
	int input_level;

	gpio_set_level(GPIO_HANDSHAKE_OUTPUT, 0);
	do {
		watchdog_reload();
		input_level = gpio_get_level(GPIO_HANDSHAKE_INPUT);
	} while (input_level);
	gpio_set_level(GPIO_HANDSHAKE_OUTPUT, 1);
	do {
		watchdog_reload();
		input_level = gpio_get_level(GPIO_HANDSHAKE_INPUT);
	} while (!input_level);
	gpio_set_level(GPIO_HANDSHAKE_OUTPUT, 0);
	do {
		watchdog_reload();
		input_level = gpio_get_level(GPIO_HANDSHAKE_INPUT);
	} while (input_level);

	return CTS_RC_SUCCESS;
}