1 /**
2 * \file
3 *
4 * \brief Critical sections related functionality implementation.
5 *
6 * Copyright (C) 2014 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 #include "hal_atomic.h"
45
46 /**
47 * \brief Driver version
48 */
49 #define DRIVER_VERSION 0x00000001u
50
51 /**
52 * \brief Disable interrupts, enter critical section
53 */
atomic_enter_critical(hal_atomic_t volatile * atomic)54 void atomic_enter_critical(hal_atomic_t volatile *atomic)
55 {
56 *atomic = __get_PRIMASK();
57 __disable_irq();
58 __DMB();
59 }
60
61 /**
62 * \brief Exit atomic section
63 */
atomic_leave_critical(hal_atomic_t volatile * atomic)64 void atomic_leave_critical(hal_atomic_t volatile *atomic)
65 {
66 __DMB();
67 __set_PRIMASK(*atomic);
68 }
69
70 /**
71 * \brief Retrieve the current driver version
72 */
atomic_get_version(void)73 uint32_t atomic_get_version(void)
74 {
75 return DRIVER_VERSION;
76 }
77
