esp-idf/components/hal/timer_hal_iram.c

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C
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/*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "hal/timer_hal.h"
#include "hal/timer_ll.h"
void timer_hal_set_counter_value(timer_hal_context_t *hal, uint64_t load_val)
{
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// - `timer_ll_set_reload_value()` will only indicate the `reload_value`
// - `timer_ll_set_reload_value()` + ``timer_ll_trigger_soft_reload()` can update the HW counter value by software
// Therefore, after updating the HW counter value, we need to restore the previous `reload_value`.
// Attention: The following process should be protected by a lock in the driver layer.
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// save current reload value
uint64_t old_reload = timer_ll_get_reload_value(hal->dev, hal->timer_id);
timer_ll_set_reload_value(hal->dev, hal->timer_id, load_val);
timer_ll_trigger_soft_reload(hal->dev, hal->timer_id);
// restore the previous reload value
timer_ll_set_reload_value(hal->dev, hal->timer_id, old_reload);
}
uint64_t timer_hal_capture_and_get_counter_value(timer_hal_context_t *hal)
{
timer_ll_trigger_soft_capture(hal->dev, hal->timer_id);
return timer_ll_get_counter_value(hal->dev, hal->timer_id);
}