102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may 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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// http://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,
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// WITHOUT 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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#pragma once
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/**
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* @file esp_timer_impl.h
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*
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* @brief Interface between common and platform-specific parts of esp_timer.
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*
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* The functions in this header file are implemented for each supported SoC.
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* High level functions defined in esp_timer.c call the functions here to
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* interact with the hardware.
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*/
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#include <stdint.h>
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#include "esp_err.h"
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#include "esp_intr_alloc.h"
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/**
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* @brief Initialize platform specific layer of esp_timer
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* @param alarm_handler function to call on timer interrupt
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* @return ESP_OK, ESP_ERR_NO_MEM, or one of the errors from interrupt allocator
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*/
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esp_err_t esp_timer_impl_init(intr_handler_t alarm_handler);
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/**
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* @brief Deinitialize platform specific layer of esp_timer
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*/
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void esp_timer_impl_deinit();
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/**
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* @brief Set up the timer interrupt to fire at a particular time
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*
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* If the alarm time is too close in the future, implementation should set the
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* alarm to the earliest time possible.
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*
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* @param timestamp time in microseconds when interrupt should fire (relative to
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* boot time, i.e. as returned by esp_timer_impl_get_time)
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*/
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void esp_timer_impl_set_alarm(uint64_t timestamp);
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/**
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* @brief Notify esp_timer implementation that APB frequency has changed
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*
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* Called by the frequency switching code.
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*
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* @param apb_ticks_per_us new number of APB clock ticks per microsecond
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*/
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void esp_timer_impl_update_apb_freq(uint32_t apb_ticks_per_us);
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/**
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* @brief Adjust current esp_timer time by a certain value
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*
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* Called from light sleep code to synchronize esp_timer time with RTC time.
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*
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* @param time_us adjustment to apply to esp_timer time, in microseconds
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*/
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void esp_timer_impl_advance(int64_t time_us);
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/**
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* @brief Get time, in microseconds, since esp_timer_impl_init was called
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* @return timestamp in microseconds
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*/
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uint64_t esp_timer_impl_get_time();
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/**
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* @brief Get minimal timer period, in microseconds
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* Periods shorter than the one returned may not be possible to achieve due to
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* interrupt latency and context switch time. Short period of periodic timer may
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* cause the system to spend all the time servicing the interrupt and timer
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* callback, preventing other tasks from running.
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* @return minimal period of periodic timer, in microseconds
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*/
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uint64_t esp_timer_impl_get_min_period_us();
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/**
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* @brief obtain internal critical section used esp_timer implementation
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* This can be used when a sequence of calls to esp_timer has to be made,
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* and it is necessary that the state of the timer is consistent between
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* the calls. Should be treated in the same way as a spinlock.
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* Call esp_timer_impl_unlock to release the lock
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*/
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void esp_timer_impl_lock();
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/**
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* @brief counterpart of esp_timer_impl_lock
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*/
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void esp_timer_impl_unlock();
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