1
2 /**
3 * \file
4 *
5 * \brief SysTick related functionality implementation.
6 *
7 * Copyright (C) 2014 Atmel Corporation. All rights reserved.
8 *
9 * \asf_license_start
10 *
11 * \page License
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright notice,
17 * this list of conditions and the following disclaimer.
18 *
19 * 2. Redistributions in binary form must reproduce the above copyright notice,
20 * this list of conditions and the following disclaimer in the documentation
21 * and/or other materials provided with the distribution.
22 *
23 * 3. The name of Atmel may not be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * 4. This software may only be redistributed and used in connection with an
27 * Atmel microcontroller product.
28 *
29 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
32 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
33 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
38 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 * POSSIBILITY OF SUCH DAMAGE.
40 *
41 * \asf_license_stop
42 *
43 */
44
45 #include <hpl_time_measure.h>
46 #include <hpl_systick_config.h>
47
48 /**
49 * \brief Initialize system time module
50 */
_system_time_init(void * const hw)51 void _system_time_init(void *const hw)
52 {
53 (void)hw;
54 SysTick->LOAD = (0xFFFFFF << SysTick_LOAD_RELOAD_Pos);
55 SysTick->CTRL = (1 << SysTick_CTRL_ENABLE_Pos) | (CONF_SYSTICK_TICKINT << SysTick_CTRL_TICKINT_Pos)
56 | (1 << SysTick_CTRL_CLKSOURCE_Pos);
57 }
58 /**
59 * \brief Initialize delay functionality
60 */
_delay_init(void * const hw)61 void _delay_init(void *const hw)
62 {
63 _system_time_init(hw);
64 }
65
66 /**
67 * \brief De-initialize system time module
68 */
_system_time_deinit(void * const hw)69 void _system_time_deinit(void *const hw)
70 {
71 (void)hw;
72 SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
73 }
74
75 /**
76 * \brief Get system time
77 */
_system_time_get(const void * const hw)78 system_time_t _system_time_get(const void *const hw)
79 {
80 (void)hw;
81 return (system_time_t)SysTick->VAL;
82 }
83
84 /**
85 * \brief Get maximum possible system time
86 */
_system_time_get_max_time_value(const void * const hw)87 system_time_t _system_time_get_max_time_value(const void *const hw)
88 {
89 (void)hw;
90 return 0xFFFFFF;
91 }
92 /**
93 * \brief Delay loop to delay n number of cycles
94 */
_delay_cycles(void * const hw,uint32_t cycles)95 void _delay_cycles(void *const hw, uint32_t cycles)
96 {
97 (void)hw;
98 uint8_t n = cycles >> 24;
99 uint32_t buf = cycles;
100
101 while (n--) {
102 SysTick->LOAD = 0xFFFFFF;
103 SysTick->VAL = 0xFFFFFF;
104 while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk))
105 ;
106 buf -= 0xFFFFFF;
107 }
108
109 SysTick->LOAD = buf;
110 SysTick->VAL = buf;
111 while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk))
112 ;
113 }
114
