mirror of
https://github.com/espressif/esp-idf.git
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84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*
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* Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* Additions Copyright 2016 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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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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/**
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* @file timer.c
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* @brief FreeRTOS implementation of the timer interface uses ticks.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <limits.h>
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#include "timer_platform.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_log.h"
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const static char *TAG = "aws_timer";
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bool has_timer_expired(Timer *timer) {
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uint32_t now = xTaskGetTickCount();
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bool expired = (now - timer->start_ticks) >= timer->timeout_ticks;
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/* AWS IoT SDK isn't very RTOS friendly because it polls for "done
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timers" a lot without ever sleeping on them. So we hack in some
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amount of sleeping here: if it seems like the caller is polling
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an unexpired timer in a tight loop then we delay a tick to let
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things progress elsewhere.
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*/
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if(!expired && now == timer->last_polled_ticks) {
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vTaskDelay(1);
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}
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timer->last_polled_ticks = now;
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return expired;
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}
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void countdown_ms(Timer *timer, uint32_t timeout) {
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timer->start_ticks = xTaskGetTickCount();
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timer->timeout_ticks = timeout / portTICK_PERIOD_MS;
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timer->last_polled_ticks = 0;
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}
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uint32_t left_ms(Timer *timer) {
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uint32_t now = xTaskGetTickCount();
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uint32_t elapsed = now - timer->start_ticks;
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if (elapsed < timer->timeout_ticks) {
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return (timer->timeout_ticks - elapsed) * portTICK_PERIOD_MS;
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} else {
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return 0;
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}
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}
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void countdown_sec(Timer *timer, uint32_t timeout) {
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if (timeout > UINT32_MAX / 1000) {
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ESP_LOGE(TAG, "timeout is out of range: %ds", timeout);
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}
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countdown_ms(timer, timeout * 1000);
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}
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void init_timer(Timer *timer) {
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timer->start_ticks = 0;
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timer->timeout_ticks = 0;
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timer->last_polled_ticks = 0;
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}
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#ifdef __cplusplus
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}
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#endif
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