source: S-port/trunk/Drivers/CMSIS/RTOS2/Source/os_systick.c

Last change on this file was 1, checked in by AlexLir, 3 years ago
File size: 3.6 KB
Line 
1/**************************************************************************//**
2 * @file os_systick.c
3 * @brief CMSIS OS Tick SysTick implementation
4 * @version V1.0.1
5 * @date 24. November 2017
6 ******************************************************************************/
7/*
8 * Copyright (c) 2017-2017 ARM Limited. All rights reserved.
9 *
10 * SPDX-License-Identifier: Apache-2.0
11 *
12 * Licensed under the Apache License, Version 2.0 (the License); you may
13 * not use this file except in compliance with the License.
14 * You may obtain a copy of the License at
15 *
16 * www.apache.org/licenses/LICENSE-2.0
17 *
18 * Unless required by applicable law or agreed to in writing, software
19 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
20 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
21 * See the License for the specific language governing permissions and
22 * limitations under the License.
23 */
24
25#include "os_tick.h"
26
27//lint -emacro((923,9078),SCB,SysTick) "cast from unsigned long to pointer"
28#include "RTE_Components.h"
29#include CMSIS_device_header
30
31#ifdef SysTick
32
33#ifndef SYSTICK_IRQ_PRIORITY
34#define SYSTICK_IRQ_PRIORITY 0xFFU
35#endif
36
37static uint8_t PendST;
38
39// Setup OS Tick.
40__WEAK int32_t OS_Tick_Setup (uint32_t freq, IRQHandler_t handler) {
41 uint32_t load;
42 (void)handler;
43
44 if (freq == 0U) {
45 //lint -e{904} "Return statement before end of function"
46 return (-1);
47 }
48
49 load = (SystemCoreClock / freq) - 1U;
50 if (load > 0x00FFFFFFU) {
51 //lint -e{904} "Return statement before end of function"
52 return (-1);
53 }
54
55 // Set SysTick Interrupt Priority
56#if ((defined(__ARM_ARCH_8M_MAIN__) && (__ARM_ARCH_8M_MAIN__ != 0)) || \
57 (defined(__CORTEX_M) && (__CORTEX_M == 7U)))
58 SCB->SHPR[11] = SYSTICK_IRQ_PRIORITY;
59#elif (defined(__ARM_ARCH_8M_BASE__) && (__ARM_ARCH_8M_BASE__ != 0))
60 SCB->SHPR[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24);
61#elif ((defined(__ARM_ARCH_7M__) && (__ARM_ARCH_7M__ != 0)) || \
62 (defined(__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ != 0)))
63 SCB->SHP[11] = SYSTICK_IRQ_PRIORITY;
64#elif (defined(__ARM_ARCH_6M__) && (__ARM_ARCH_6M__ != 0))
65 SCB->SHP[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24);
66#else
67#error "Unknown ARM Core!"
68#endif
69
70 SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk;
71 SysTick->LOAD = load;
72 SysTick->VAL = 0U;
73
74 PendST = 0U;
75
76 return (0);
77}
78
79/// Enable OS Tick.
80__WEAK void OS_Tick_Enable (void) {
81
82 if (PendST != 0U) {
83 PendST = 0U;
84 SCB->ICSR = SCB_ICSR_PENDSTSET_Msk;
85 }
86
87 SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
88}
89
90/// Disable OS Tick.
91__WEAK void OS_Tick_Disable (void) {
92
93 SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
94
95 if ((SCB->ICSR & SCB_ICSR_PENDSTSET_Msk) != 0U) {
96 SCB->ICSR = SCB_ICSR_PENDSTCLR_Msk;
97 PendST = 1U;
98 }
99}
100
101// Acknowledge OS Tick IRQ.
102__WEAK void OS_Tick_AcknowledgeIRQ (void) {
103 (void)SysTick->CTRL;
104}
105
106// Get OS Tick IRQ number.
107__WEAK int32_t OS_Tick_GetIRQn (void) {
108 return ((int32_t)SysTick_IRQn);
109}
110
111// Get OS Tick clock.
112__WEAK uint32_t OS_Tick_GetClock (void) {
113 return (SystemCoreClock);
114}
115
116// Get OS Tick interval.
117__WEAK uint32_t OS_Tick_GetInterval (void) {
118 return (SysTick->LOAD + 1U);
119}
120
121// Get OS Tick count value.
122__WEAK uint32_t OS_Tick_GetCount (void) {
123 uint32_t load = SysTick->LOAD;
124 return (load - SysTick->VAL);
125}
126
127// Get OS Tick overflow status.
128__WEAK uint32_t OS_Tick_GetOverflow (void) {
129 return ((SysTick->CTRL >> 16) & 1U);
130}
131
132#endif // SysTick
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