1 /**************************************************************************//** 2 * @file os_systick.c 3 * @brief CMSIS OS Tick SysTick implementation 4 * @version V1.0.5 5 * @date 16. October 2023 6 ******************************************************************************/ 7 /* 8 * Copyright (c) 2017-2023 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 37 static uint8_t PendST __attribute__((section(".bss.os"))); 38 39 // Setup OS Tick. OS_Tick_Setup(uint32_t freq,IRQHandler_t handler)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(__ARM_ARCH_8_1M_MAIN__) && (__ARM_ARCH_8_1M_MAIN__ != 0)) || \ 58 (defined(__CORTEX_M) && (__CORTEX_M == 7U))) 59 SCB->SHPR[11] = SYSTICK_IRQ_PRIORITY; 60 #elif (defined(__ARM_ARCH_8M_BASE__) && (__ARM_ARCH_8M_BASE__ != 0)) 61 SCB->SHPR[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24); 62 #elif ((defined(__ARM_ARCH_7M__) && (__ARM_ARCH_7M__ != 0)) || \ 63 (defined(__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ != 0))) 64 SCB->SHPR[11] = SYSTICK_IRQ_PRIORITY; 65 #elif (defined(__ARM_ARCH_6M__) && (__ARM_ARCH_6M__ != 0)) 66 SCB->SHPR[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24); 67 #else 68 #error "Unknown ARM Core!" 69 #endif 70 71 SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk; 72 SysTick->LOAD = load; 73 SysTick->VAL = 0U; 74 75 PendST = 0U; 76 77 return (0); 78 } 79 80 /// Enable OS Tick. OS_Tick_Enable(void)81__WEAK void OS_Tick_Enable (void) { 82 83 if (PendST != 0U) { 84 PendST = 0U; 85 SCB->ICSR = SCB_ICSR_PENDSTSET_Msk; 86 } 87 88 SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; 89 } 90 91 /// Disable OS Tick. OS_Tick_Disable(void)92__WEAK void OS_Tick_Disable (void) { 93 94 SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; 95 96 if ((SCB->ICSR & SCB_ICSR_PENDSTSET_Msk) != 0U) { 97 SCB->ICSR = SCB_ICSR_PENDSTCLR_Msk; 98 PendST = 1U; 99 } 100 } 101 102 // Acknowledge OS Tick IRQ. OS_Tick_AcknowledgeIRQ(void)103__WEAK void OS_Tick_AcknowledgeIRQ (void) { 104 (void)SysTick->CTRL; 105 } 106 107 // Get OS Tick IRQ number. OS_Tick_GetIRQn(void)108__WEAK int32_t OS_Tick_GetIRQn (void) { 109 return ((int32_t)SysTick_IRQn); 110 } 111 112 // Get OS Tick clock. OS_Tick_GetClock(void)113__WEAK uint32_t OS_Tick_GetClock (void) { 114 return (SystemCoreClock); 115 } 116 117 // Get OS Tick interval. OS_Tick_GetInterval(void)118__WEAK uint32_t OS_Tick_GetInterval (void) { 119 return (SysTick->LOAD + 1U); 120 } 121 122 // Get OS Tick count value. OS_Tick_GetCount(void)123__WEAK uint32_t OS_Tick_GetCount (void) { 124 uint32_t val; 125 uint32_t count; 126 127 val = SysTick->VAL; 128 if (val != 0U) { 129 count = (SysTick->LOAD - val) + 1U; 130 } else { 131 count = 0U; 132 } 133 134 return (count); 135 } 136 137 // Get OS Tick overflow status. OS_Tick_GetOverflow(void)138__WEAK uint32_t OS_Tick_GetOverflow (void) { 139 return ((SCB->ICSR & SCB_ICSR_PENDSTSET_Msk) >> SCB_ICSR_PENDSTSET_Pos); 140 } 141 142 #endif // SysTick 143
