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https://github.com/Telecominfraproject/OpenCellular.git
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a9f4794edb
BUG=chrome-os-partner:7498
TEST=powerled {off, red, yellow, green}
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Change-Id: I48beaad94d75c0ec30a969ea4b0e35f54e052085
33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
/* Copyright (c) 2012 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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/* 1-wire interface for Chrome EC */
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/* Note that 1-wire communication is VERY latency-sensitive. If these
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* functions are run at low priority, communication may be garbled. However,
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* these functions are also slow enough (~1ms per call) that it's really not
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* desirable to put them at high priority. So make sure you check the
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* confirmation code from the slave for any communication, and retry a few
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* times in case of failure. */
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#ifndef __CROS_EC_ONEWIRE_H
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#define __CROS_EC_ONEWIRE_H
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#include "common.h"
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/* Initialize the module. */
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int onewire_init(void);
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/* Reset the 1-wire bus. Returns error if presence detect fails. */
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int onewire_reset(void);
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/* Read a byte from the 1-wire bus. Returns the byte. */
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int onewire_read(void);
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/* Write a byte to the 1-wire bus. */
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void onewire_write(int data);
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#endif /* __CROS_EC_ONEWIRE_H */
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