ESP-IDF
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Outline
#include <stdlib.h>
#include "hal/timer_hal.h"
#include "hal/timer_ll.h"
#include "soc/soc_caps.h"
timer_hal_init(timer_hal_context_t *, uint32_t, uint32_t)
timer_hal_deinit(timer_hal_context_t *)
timer_hal_set_counter_value(timer_hal_context_t *, uint64_t)
timer_hal_capture_and_get_counter_value(timer_hal_context_t *)
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/hal/timer_hal.c
 
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/* * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <stdlib.h> #include "hal/timer_hal.h" #include "hal/timer_ll.h" #include "soc/soc_caps.h" void timer_hal_init(timer_hal_context_t *hal, uint32_t group_num, uint32_t timer_num) { hal->dev = TIMER_LL_GET_HW(group_num); hal->timer_id = timer_num; // stop counter, alarm, auto-reload at first place timer_ll_enable_counter(hal->dev, timer_num, false); timer_ll_enable_auto_reload(hal->dev, timer_num, false); timer_ll_enable_alarm(hal->dev, timer_num, false); // enable ETM subsystem if available #if SOC_TIMER_SUPPORT_ETM timer_ll_enable_etm(hal->dev, true); #endif }{ ... } void timer_hal_deinit(timer_hal_context_t *hal) { // ensure counter, alarm, auto-reload are disabled timer_ll_enable_counter(hal->dev, hal->timer_id, false); timer_ll_enable_auto_reload(hal->dev, hal->timer_id, false); timer_ll_enable_alarm(hal->dev, hal->timer_id, false); #if SOC_TIMER_SUPPORT_ETM timer_ll_enable_etm(hal->dev, false); #endif hal->dev = NULL; }{ ... } 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); }{ ... }
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