esp-idf/components/hal/esp32s3/systimer_hal.c

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// Copyright 2020 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.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License 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.
#include <sys/param.h>
#include "soc/soc_caps.h"
#include "hal/systimer_hal.h"
#include "hal/systimer_ll.h"
#include "hal/systimer_types.h"
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#include "hal/clk_gate_ll.h"
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#define SYSTIMER_TICKS_PER_US (16) // Systimer clock source is fixed to 16MHz
uint64_t systimer_hal_get_counter_value(systimer_counter_id_t counter_id)
{
uint32_t lo, lo_start, hi;
/* Set the "update" bit and wait for acknowledgment */
systimer_ll_counter_snapshot(counter_id);
while (!systimer_ll_is_counter_value_valid(counter_id));
/* Read LO, HI, then LO again, check that LO returns the same value.
* This accounts for the case when an interrupt may happen between reading
* HI and LO values, and this function may get called from the ISR.
* In this case, the repeated read will return consistent values.
*/
lo_start = systimer_ll_get_counter_value_low(counter_id);
do {
lo = lo_start;
hi = systimer_ll_get_counter_value_high(counter_id);
lo_start = systimer_ll_get_counter_value_low(counter_id);
} while (lo_start != lo);
systimer_counter_value_t result = {
.lo = lo,
.hi = hi
};
return result.val;
}
uint64_t systimer_hal_get_time(systimer_counter_id_t counter_id)
{
return systimer_hal_get_counter_value(counter_id) / SYSTIMER_TICKS_PER_US;
}
void systimer_hal_set_alarm_target(systimer_alarm_id_t alarm_id, uint64_t target)
{
systimer_counter_value_t alarm = { .val = target * SYSTIMER_TICKS_PER_US};
systimer_ll_disable_alarm(alarm_id);
systimer_ll_set_alarm_target(alarm_id, alarm.val);
systimer_ll_apply_alarm_value(alarm_id);
systimer_ll_enable_alarm(alarm_id);
}
void systimer_hal_set_alarm_period(systimer_alarm_id_t alarm_id, uint32_t period)
{
systimer_ll_disable_alarm(alarm_id);
systimer_ll_set_alarm_period(alarm_id, period * SYSTIMER_TICKS_PER_US);
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systimer_ll_apply_alarm_value(alarm_id);
systimer_ll_enable_alarm(alarm_id);
}
uint64_t systimer_hal_get_alarm_value(systimer_alarm_id_t alarm_id)
{
return systimer_ll_get_alarm_target(alarm_id);
}
void systimer_hal_enable_alarm_int(systimer_alarm_id_t alarm_id)
{
systimer_ll_enable_alarm_int(alarm_id);
}
void systimer_hal_on_apb_freq_update(uint32_t apb_ticks_per_us)
{
/* Nothing to do here, SYSTIMER clock is independent of APB clock */
(void)apb_ticks_per_us;
}
void systimer_hal_counter_value_advance(systimer_counter_id_t counter_id, int64_t time_us)
{
systimer_counter_value_t new_count = { .val = systimer_hal_get_counter_value(counter_id) + time_us * SYSTIMER_TICKS_PER_US };
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systimer_ll_set_counter_value(counter_id, new_count.val);
systimer_ll_apply_counter_value(counter_id);
}
void systimer_hal_enable_counter(systimer_counter_id_t counter_id)
{
systimer_ll_enable_counter(counter_id);
}
void systimer_hal_init(void)
{
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periph_ll_enable_clk_clear_rst(PERIPH_SYSTIMER_MODULE);
systimer_ll_enable_clock();
}
void systimer_hal_select_alarm_mode(systimer_alarm_id_t alarm_id, systimer_alarm_mode_t mode)
{
switch (mode) {
case SYSTIMER_ALARM_MODE_ONESHOT:
systimer_ll_enable_alarm_oneshot(alarm_id);
break;
case SYSTIMER_ALARM_MODE_PERIOD:
systimer_ll_enable_alarm_period(alarm_id);
break;
default:
break;
}
}
void systimer_hal_connect_alarm_counter(systimer_alarm_id_t alarm_id, systimer_counter_id_t counter_id)
{
systimer_ll_connect_alarm_counter(alarm_id, counter_id);
}