1 /**
2 * \file
3 *
4 * \brief SAM Reset related functionality
5 *
6 * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
7 *
8 * \asf_license_start
9 *
10 * \page License
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright notice,
16 * this list of conditions and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright notice,
19 * this list of conditions and the following disclaimer in the documentation
20 * and/or other materials provided with the distribution.
21 *
22 * 3. The name of Atmel may not be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * 4. This software may only be redistributed and used in connection with an
26 * Atmel microcontroller product.
27 *
28 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
29 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
31 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
32 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
36 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 *
40 * \asf_license_stop
41 *
42 */
43 /*
44 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
45 */
46 #ifndef RESET_H_INCLUDED
47 #define RESET_H_INCLUDED
48
49 #include <compiler.h>
50
51 #ifdef __cplusplus
52 extern "C" {
53 #endif
54
55 /**
56 * \addtogroup asfdoc_sam0_system_group
57 * @{
58 */
59
60 /**
61 * \brief Reset causes of the system.
62 *
63 * List of possible reset causes of the system.
64 */
65 enum system_reset_cause {
66 /** The system was last reset by a software reset */
67 SYSTEM_RESET_CAUSE_SOFTWARE = PM_RCAUSE_SYST,
68 /** The system was last reset by the watchdog timer */
69 SYSTEM_RESET_CAUSE_WDT = PM_RCAUSE_WDT,
70 /** The system was last reset because the external reset line was pulled low */
71 SYSTEM_RESET_CAUSE_EXTERNAL_RESET = PM_RCAUSE_EXT,
72 /** The system was last reset by the BOD33 */
73 SYSTEM_RESET_CAUSE_BOD33 = PM_RCAUSE_BOD33,
74 /** The system was last reset by the BOD12 */
75 SYSTEM_RESET_CAUSE_BOD12 = PM_RCAUSE_BOD12,
76 /** The system was last reset by the POR (Power on reset) */
77 SYSTEM_RESET_CAUSE_POR = PM_RCAUSE_POR,
78 };
79
80
81 /**
82 * \name Reset Control
83 * @{
84 */
85
86 /**
87 * \brief Reset the MCU.
88 *
89 * Resets the MCU and all associated peripherals and registers, except RTC, all 32KHz sources,
90 * WDT (if ALWAYSON is set) and GCLK (if WRTLOCK is set).
91 *
92 */
system_reset(void)93 static inline void system_reset(void)
94 {
95 NVIC_SystemReset();
96 }
97
98 /**
99 * \brief Return the reset cause.
100 *
101 * Retrieves the cause of the last system reset.
102 *
103 * \return An enum value indicating the cause of the last system reset.
104 */
system_get_reset_cause(void)105 static inline enum system_reset_cause system_get_reset_cause(void)
106 {
107 return (enum system_reset_cause)PM->RCAUSE.reg;
108 }
109
110 /**
111 * @}
112 */
113
114 /** @} */
115 #ifdef __cplusplus
116 }
117 #endif
118
119 #endif /* RESET_H_INCLUDED */
120