36 lines
887 B
C
36 lines
887 B
C
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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gpio.h"
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#include "timer.h"
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#include "watchdog.h"
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#include "cts_common.h"
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/* Return SUCCESS if and only if we reach end of function
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* Returning success here means sync was successful
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*/
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enum cts_rc sync(void)
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{
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int input_level;
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gpio_set_level(GPIO_HANDSHAKE_OUTPUT, 0);
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do {
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watchdog_reload();
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input_level = gpio_get_level(GPIO_HANDSHAKE_INPUT);
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} while (input_level);
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gpio_set_level(GPIO_HANDSHAKE_OUTPUT, 1);
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do {
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watchdog_reload();
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input_level = gpio_get_level(GPIO_HANDSHAKE_INPUT);
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} while (!input_level);
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gpio_set_level(GPIO_HANDSHAKE_OUTPUT, 0);
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do {
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watchdog_reload();
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input_level = gpio_get_level(GPIO_HANDSHAKE_INPUT);
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} while (input_level);
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return CTS_RC_SUCCESS;
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}
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