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ResetReason.h
1 /*
2  * Copyright (c) 2018-2019 Arm Limited and affiliates.
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 #ifndef MBED_RESET_REASON_H
18 #define MBED_RESET_REASON_H
19 
20 #ifdef DEVICE_RESET_REASON
21 
22 #include "reset_reason_api.h"
23 
24 namespace mbed {
25 /** \addtogroup drivers */
26 /** A platform-independent method of checking the cause of the last system reset.
27  *
28  * When the system restarts, the reason for the restart is contained in
29  * the system registers at boot time in a platform specific manner.
30  * This API provides a generic method of fetching the reason for the restart.
31  *
32  * @ingroup drivers
33  */
34 class ResetReason {
35 public:
36  /** Get the platform independent reason code for the last system reset.
37  *
38  * @return enum containing the last reset reason for the board.
39  *
40  * Example:
41  * @code
42  * const reset_reason_t reason = ResetReason::get();
43  *
44  * if (reason == RESET_REASON_WATCHDOG) {
45  * printf("Watchdog reset\n");
46  * rollback();
47  * }
48  * @endcode
49  */
50  static reset_reason_t get();
51 
52  /** Get the platform specific reason code for the last system reset.
53  *
54  * Platform specific reasons that are not covered by the ::reset_reason_t enum
55  * will cause the ResetReason::get() function to return
56  * ::RESET_REASON_PLATFORM. In order to get the actual reason the register
57  * value must be fetched directly using this function and interpreted in a
58  * platform specific manner.
59  *
60  * @return value containing the reset reason register for the given platform.
61  * If the platform contains reset reasons across multiple registers they
62  * will be concatenated here.
63  *
64  * Example:
65  * @code
66  * if (ResetReason::get() == RESET_REASON_PLATFORM) {
67  * const uint32_t platform_reason = ResetReason::get_raw();
68  * }
69  * @endcode
70  */
71  static uint32_t get_raw();
72 };
73 
74 } // namespace mbed
75 
76 #endif // DEVICE_RESET_REASON
77 #endif // MBED_RESET_REASON_H
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