esp-idf/components/hal/timer_hal.c
Chen Jichang 7638235311 feat(mcpwm): MCPWM event comparator driver
In esp32p4, the MCPWM has a new feature, mainly ETM-oriented.
Each operator has two event comparators, can generate an event
when the count value of the timer that operator connects is equal
to the value of event comparator.
2023-09-11 16:53:34 +08:00

59 lines
2.3 KiB
C

/*
* 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);
}