1 /*
2 * Copyright (c) 2019 - 2023, Nordic Semiconductor ASA
3 * All rights reserved.
4 *
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice, this
11 * list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the copyright holder nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #ifndef NRF_MUTEX_H__
35 #define NRF_MUTEX_H__
36
37 #include <nrfx.h>
38
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 /**
44 * @defgroup nrf_mutex_hal MUTEX HAL
45 * @{
46 * @ingroup nrf_mutex
47 * @brief Hardware access layer for managing the MUTEX peripheral.
48 */
49
50 /**
51 * @brief Function for locking the specified mutex.
52 *
53 * If the specified mutex is already locked, its state remains unchanged.
54 *
55 * @note Faults are not managed by the MUTEX peripheral.
56 * One consequence is that if a mutex is locked and a fault happens,
57 * it is the responsibility of the fault handler to release the mutex.
58 * If a fault handler is not managing the mutex release, the mutex will remain locked.
59 *
60 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
61 * @param[in] mutex Index of the mutex to be locked.
62 *
63 * @retval true Mutex is successfully locked.
64 * @retval false Mutex was already locked.
65 */
66 NRF_STATIC_INLINE bool nrf_mutex_lock(NRF_MUTEX_Type * p_reg, uint8_t mutex);
67
68 /**
69 * @brief Function for unlocking the specified mutex.
70 *
71 * If the specified mutex is already unlocked, its state remains unchanged.
72 *
73 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
74 * @param[in] mutex Index of the mutex to be locked.
75 */
76 NRF_STATIC_INLINE void nrf_mutex_unlock(NRF_MUTEX_Type * p_reg, uint8_t mutex);
77
78 #ifndef NRF_DECLARE_ONLY
79
nrf_mutex_lock(NRF_MUTEX_Type * p_reg,uint8_t mutex)80 NRF_STATIC_INLINE bool nrf_mutex_lock(NRF_MUTEX_Type * p_reg, uint8_t mutex)
81 {
82 return (p_reg->MUTEX[mutex] == MUTEX_MUTEX_MUTEX_Unlocked);
83 }
84
nrf_mutex_unlock(NRF_MUTEX_Type * p_reg,uint8_t mutex)85 NRF_STATIC_INLINE void nrf_mutex_unlock(NRF_MUTEX_Type * p_reg, uint8_t mutex)
86 {
87 p_reg->MUTEX[mutex] = MUTEX_MUTEX_MUTEX_Unlocked;
88 }
89
90 #endif // NRF_DECLARE_ONLY
91
92 /** @} */
93
94 #ifdef __cplusplus
95 }
96 #endif
97
98 #endif // NRF_MUTEX_H__
99
