133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/**************************************************************************//**
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* @file os_systick.c
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* @brief CMSIS OS Tick SysTick implementation
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* @version V1.0.1
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* @date 24. November 2017
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******************************************************************************/
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/*
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* Copyright (c) 2017-2017 ARM Limited. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "os_tick.h"
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//lint -emacro((923,9078),SCB,SysTick) "cast from unsigned long to pointer"
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#include "RTE_Components.h"
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#include CMSIS_device_header
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#ifdef SysTick
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#ifndef SYSTICK_IRQ_PRIORITY
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#define SYSTICK_IRQ_PRIORITY 0xFFU
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#endif
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static uint8_t PendST;
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// Setup OS Tick.
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__WEAK int32_t OS_Tick_Setup (uint32_t freq, IRQHandler_t handler) {
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uint32_t load;
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(void)handler;
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if (freq == 0U) {
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//lint -e{904} "Return statement before end of function"
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return (-1);
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}
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load = (SystemCoreClock / freq) - 1U;
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if (load > 0x00FFFFFFU) {
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//lint -e{904} "Return statement before end of function"
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return (-1);
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}
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// Set SysTick Interrupt Priority
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#if ((defined(__ARM_ARCH_8M_MAIN__) && (__ARM_ARCH_8M_MAIN__ != 0)) || \
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(defined(__CORTEX_M) && (__CORTEX_M == 7U)))
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SCB->SHPR[11] = SYSTICK_IRQ_PRIORITY;
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#elif (defined(__ARM_ARCH_8M_BASE__) && (__ARM_ARCH_8M_BASE__ != 0))
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SCB->SHPR[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24);
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#elif ((defined(__ARM_ARCH_7M__) && (__ARM_ARCH_7M__ != 0)) || \
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(defined(__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ != 0)))
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SCB->SHP[11] = SYSTICK_IRQ_PRIORITY;
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#elif (defined(__ARM_ARCH_6M__) && (__ARM_ARCH_6M__ != 0))
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SCB->SHP[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24);
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#else
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#error "Unknown ARM Core!"
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#endif
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SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk;
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SysTick->LOAD = load;
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SysTick->VAL = 0U;
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PendST = 0U;
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return (0);
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}
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/// Enable OS Tick.
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__WEAK void OS_Tick_Enable (void) {
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if (PendST != 0U) {
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PendST = 0U;
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SCB->ICSR = SCB_ICSR_PENDSTSET_Msk;
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}
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
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}
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/// Disable OS Tick.
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__WEAK void OS_Tick_Disable (void) {
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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if ((SCB->ICSR & SCB_ICSR_PENDSTSET_Msk) != 0U) {
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SCB->ICSR = SCB_ICSR_PENDSTCLR_Msk;
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PendST = 1U;
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}
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}
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// Acknowledge OS Tick IRQ.
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__WEAK void OS_Tick_AcknowledgeIRQ (void) {
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(void)SysTick->CTRL;
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}
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// Get OS Tick IRQ number.
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__WEAK int32_t OS_Tick_GetIRQn (void) {
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return ((int32_t)SysTick_IRQn);
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}
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// Get OS Tick clock.
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__WEAK uint32_t OS_Tick_GetClock (void) {
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return (SystemCoreClock);
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}
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// Get OS Tick interval.
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__WEAK uint32_t OS_Tick_GetInterval (void) {
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return (SysTick->LOAD + 1U);
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}
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// Get OS Tick count value.
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__WEAK uint32_t OS_Tick_GetCount (void) {
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uint32_t load = SysTick->LOAD;
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return (load - SysTick->VAL);
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}
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// Get OS Tick overflow status.
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__WEAK uint32_t OS_Tick_GetOverflow (void) {
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return ((SysTick->CTRL >> 16) & 1U);
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}
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#endif // SysTick
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