kopia lustrzana https://github.com/espressif/esp-idf
72 wiersze
2.1 KiB
C
72 wiersze
2.1 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "esp_timer_impl.h"
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#include "esp_timer.h"
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#include "esp_err.h"
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#include "esp_task.h"
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#include "esp_attr.h"
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/* Spinlock used to protect access to the hardware registers. */
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portMUX_TYPE s_time_update_lock = portMUX_INITIALIZER_UNLOCKED;
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/* Alarm values to generate interrupt on match
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* [0] - for ESP_TIMER_TASK alarms,
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* [1] - for ESP_TIMER_ISR alarms.
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*/
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uint64_t timestamp_id[2] = { UINT64_MAX, UINT64_MAX };
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void esp_timer_impl_lock(void)
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{
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portENTER_CRITICAL(&s_time_update_lock);
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}
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void esp_timer_impl_unlock(void)
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{
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portEXIT_CRITICAL(&s_time_update_lock);
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}
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void esp_timer_private_lock(void) __attribute__((alias("esp_timer_impl_lock")));
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void esp_timer_private_unlock(void) __attribute__((alias("esp_timer_impl_unlock")));
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void IRAM_ATTR esp_timer_impl_set_alarm(uint64_t timestamp)
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{
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esp_timer_impl_set_alarm_id(timestamp, 0);
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}
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#ifdef CONFIG_ESP_TIMER_SUPPORTS_ISR_DISPATCH_METHOD
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void IRAM_ATTR esp_timer_impl_try_to_set_next_alarm(void)
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{
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portENTER_CRITICAL_ISR(&s_time_update_lock);
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unsigned now_alarm_idx; // ISR is called due to this current alarm
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unsigned next_alarm_idx; // The following alarm after now_alarm_idx
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if (timestamp_id[0] < timestamp_id[1]) {
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now_alarm_idx = 0;
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next_alarm_idx = 1;
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} else {
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now_alarm_idx = 1;
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next_alarm_idx = 0;
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}
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if (timestamp_id[next_alarm_idx] != UINT64_MAX) {
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// The following alarm is valid and can be used.
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// Remove the current alarm from consideration.
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esp_timer_impl_set_alarm_id(UINT64_MAX, now_alarm_idx);
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} else {
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// There is no the following alarm.
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// Remove the current alarm from consideration as well.
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timestamp_id[now_alarm_idx] = UINT64_MAX;
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}
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portEXIT_CRITICAL_ISR(&s_time_update_lock);
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}
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#endif
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/* FIXME: This value is safe for 80MHz APB frequency, should be modified to depend on clock frequency. */
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uint64_t IRAM_ATTR esp_timer_impl_get_min_period_us(void)
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{
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return 50;
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}
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