mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*
|
|
* Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
* Additions Copyright 2016 Espressif Systems (Shanghai) PTE LTD
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
* A copy of the License is located at
|
|
*
|
|
* http://aws.amazon.com/apache2.0
|
|
*
|
|
* or in the "license" file accompanying this file. This file is distributed
|
|
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
|
|
* express or implied. See the License for the specific language governing
|
|
* permissions and limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file timer.c
|
|
* @brief FreeRTOS implementation of the timer interface uses ticks.
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <limits.h>
|
|
|
|
#include "timer_platform.h"
|
|
#include "freertos/FreeRTOS.h"
|
|
#include "freertos/task.h"
|
|
#include "esp_log.h"
|
|
|
|
const static char *TAG = "aws_timer";
|
|
|
|
bool has_timer_expired(Timer *timer) {
|
|
uint32_t now = xTaskGetTickCount();
|
|
bool expired = (now - timer->start_ticks) >= timer->timeout_ticks;
|
|
|
|
/* AWS IoT SDK isn't very RTOS friendly because it polls for "done
|
|
timers" a lot without ever sleeping on them. So we hack in some
|
|
amount of sleeping here: if it seems like the caller is polling
|
|
an unexpired timer in a tight loop then we delay a tick to let
|
|
things progress elsewhere.
|
|
*/
|
|
if(!expired && now == timer->last_polled_ticks) {
|
|
vTaskDelay(1);
|
|
}
|
|
timer->last_polled_ticks = now;
|
|
return expired;
|
|
}
|
|
|
|
void countdown_ms(Timer *timer, uint32_t timeout) {
|
|
timer->start_ticks = xTaskGetTickCount();
|
|
timer->timeout_ticks = timeout / portTICK_PERIOD_MS;
|
|
timer->last_polled_ticks = 0;
|
|
}
|
|
|
|
uint32_t left_ms(Timer *timer) {
|
|
uint32_t now = xTaskGetTickCount();
|
|
uint32_t elapsed = now - timer->start_ticks;
|
|
if (elapsed < timer->timeout_ticks) {
|
|
return (timer->timeout_ticks - elapsed) * portTICK_PERIOD_MS;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void countdown_sec(Timer *timer, uint32_t timeout) {
|
|
if (timeout > UINT32_MAX / 1000) {
|
|
ESP_LOGE(TAG, "timeout is out of range: %ds", timeout);
|
|
}
|
|
countdown_ms(timer, timeout * 1000);
|
|
}
|
|
|
|
void init_timer(Timer *timer) {
|
|
timer->start_ticks = 0;
|
|
timer->timeout_ticks = 0;
|
|
timer->last_polled_ticks = 0;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|