RTC auf true
rtos/TARGET_CORTEX/SysTimer.cpp
- Committer:
- kevman
- Date:
- 2019-03-13
- Revision:
- 2:7aab896b1a3b
- Parent:
- 0:38ceb79fef03
File content as of revision 2:7aab896b1a3b:
/* mbed Microcontroller Library * Copyright (c) 2006-2012 ARM Limited * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "rtos/TARGET_CORTEX/SysTimer.h" #if DEVICE_LPTICKER #include "hal/lp_ticker_api.h" #include "mbed_critical.h" #if defined(TARGET_CORTEX_A) #include "rtx_core_ca.h" #else//Cortex-M #include "rtx_core_cm.h" #endif extern "C" { #include "rtx_lib.h" #if defined(TARGET_CORTEX_A) #include "irq_ctrl.h" #endif } #if (defined(NO_SYSTICK)) /** * Return an IRQ number that can be used in the absence of SysTick * * @return Free IRQ number that can be used */ extern "C" IRQn_Type mbed_get_m0_tick_irqn(void); #endif #if defined(TARGET_CORTEX_A) extern "C" IRQn_ID_t mbed_get_a9_tick_irqn(void); #endif namespace rtos { namespace internal { SysTimer::SysTimer() : TimerEvent(get_lp_ticker_data()), _start_time(0), _tick(0) { _start_time = ticker_read_us(_ticker_data); _suspend_time_passed = true; _suspended = false; } SysTimer::SysTimer(const ticker_data_t *data) : TimerEvent(data), _start_time(0), _tick(0) { _start_time = ticker_read_us(_ticker_data); } void SysTimer::setup_irq() { #if (defined(NO_SYSTICK) && !defined (TARGET_CORTEX_A)) NVIC_SetVector(mbed_get_m0_tick_irqn(), (uint32_t)SysTick_Handler); NVIC_SetPriority(mbed_get_m0_tick_irqn(), 0xFF); /* RTOS requires lowest priority */ NVIC_EnableIRQ(mbed_get_m0_tick_irqn()); #else // Ensure SysTick has the correct priority as it is still used // to trigger software interrupts on each tick. The period does // not matter since it will never start counting. OS_Tick_Setup(osRtxConfig.tick_freq, OS_TICK_HANDLER); #endif } void SysTimer::suspend(uint32_t ticks) { core_util_critical_section_enter(); remove(); schedule_tick(ticks); _suspend_time_passed = false; _suspended = true; core_util_critical_section_exit(); } bool SysTimer::suspend_time_passed() { return _suspend_time_passed; } uint32_t SysTimer::resume() { core_util_critical_section_enter(); _suspended = false; _suspend_time_passed = true; remove(); uint64_t new_tick = (ticker_read_us(_ticker_data) - _start_time) * OS_TICK_FREQ / 1000000; if (new_tick > _tick) { // Don't update to the current tick. Instead, update to the // previous tick and let the SysTick handler increment it // to the current value. This allows scheduling restart // successfully after the OS is resumed. new_tick--; } uint32_t elapsed_ticks = new_tick - _tick; _tick = new_tick; core_util_critical_section_exit(); return elapsed_ticks; } void SysTimer::schedule_tick(uint32_t delta) { core_util_critical_section_enter(); insert_absolute(_start_time + (_tick + delta) * 1000000ULL / OS_TICK_FREQ); core_util_critical_section_exit(); } void SysTimer::cancel_tick() { core_util_critical_section_enter(); remove(); core_util_critical_section_exit(); } uint32_t SysTimer::get_tick() { return _tick & 0xFFFFFFFF; } us_timestamp_t SysTimer::get_time() { return ticker_read_us(_ticker_data); } SysTimer::~SysTimer() { } void SysTimer::_set_irq_pending() { // Protected function synchronized externally #if (defined(NO_SYSTICK)) NVIC_SetPendingIRQ(mbed_get_m0_tick_irqn()); #elif (TARGET_CORTEX_A) IRQ_SetPending(mbed_get_a9_tick_irqn()); #else SCB->ICSR = SCB_ICSR_PENDSTSET_Msk; #endif } void SysTimer::_increment_tick() { // Protected function synchronized externally _tick++; } void SysTimer::handler() { core_util_critical_section_enter(); if (_suspended) { _suspend_time_passed = true; } else { _set_irq_pending(); _increment_tick(); schedule_tick(); } core_util_critical_section_exit(); } } } #endif