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/* 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;
}
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