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124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <sys/param.h>
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#include "soc/soc_caps.h"
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#include "hal/systimer_hal.h"
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#include "hal/systimer_ll.h"
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#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
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uint64_t systimer_hal_get_counter_value(systimer_counter_id_t counter_id)
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{
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uint32_t lo, lo_start, hi;
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/* Set the "update" bit and wait for acknowledgment */
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systimer_ll_counter_snapshot(counter_id);
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while (!systimer_ll_is_counter_value_valid(counter_id));
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/* Read LO, HI, then LO again, check that LO returns the same value.
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* This accounts for the case when an interrupt may happen between reading
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* HI and LO values, and this function may get called from the ISR.
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* In this case, the repeated read will return consistent values.
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*/
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lo_start = systimer_ll_get_counter_value_low(counter_id);
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do {
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lo = lo_start;
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hi = systimer_ll_get_counter_value_high(counter_id);
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lo_start = systimer_ll_get_counter_value_low(counter_id);
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} while (lo_start != lo);
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systimer_counter_value_t result = {
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.lo = lo,
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.hi = hi
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};
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return result.val;
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}
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uint64_t systimer_hal_get_time(systimer_counter_id_t counter_id)
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{
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return systimer_hal_get_counter_value(counter_id) / SYSTIMER_TICKS_PER_US;
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}
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void systimer_hal_set_alarm_target(systimer_alarm_id_t alarm_id, uint64_t target)
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{
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systimer_counter_value_t alarm = { .val = target * SYSTIMER_TICKS_PER_US};
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systimer_ll_disable_alarm(alarm_id);
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systimer_ll_set_alarm_target(alarm_id, alarm.val);
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systimer_ll_apply_alarm_value(alarm_id);
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systimer_ll_enable_alarm(alarm_id);
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}
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void systimer_hal_set_alarm_period(systimer_alarm_id_t alarm_id, uint32_t period)
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{
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systimer_ll_disable_alarm(alarm_id);
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systimer_ll_set_alarm_period(alarm_id, period * SYSTIMER_TICKS_PER_US);
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systimer_ll_apply_alarm_value(alarm_id);
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systimer_ll_enable_alarm(alarm_id);
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}
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uint64_t systimer_hal_get_alarm_value(systimer_alarm_id_t alarm_id)
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{
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return systimer_ll_get_alarm_target(alarm_id);
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}
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void systimer_hal_enable_alarm_int(systimer_alarm_id_t alarm_id)
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{
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systimer_ll_enable_alarm_int(alarm_id);
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}
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void systimer_hal_on_apb_freq_update(uint32_t apb_ticks_per_us)
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{
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/* Nothing to do here, SYSTIMER clock is independent of APB clock */
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(void)apb_ticks_per_us;
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}
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void systimer_hal_counter_value_advance(systimer_counter_id_t counter_id, int64_t time_us)
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{
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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);
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systimer_ll_apply_counter_value(counter_id);
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}
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void systimer_hal_enable_counter(systimer_counter_id_t counter_id)
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{
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systimer_ll_enable_counter(counter_id);
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}
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void systimer_hal_init(void)
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{
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periph_ll_enable_clk_clear_rst(PERIPH_SYSTIMER_MODULE);
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systimer_ll_enable_clock();
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}
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void systimer_hal_select_alarm_mode(systimer_alarm_id_t alarm_id, systimer_alarm_mode_t mode)
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{
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switch (mode) {
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case SYSTIMER_ALARM_MODE_ONESHOT:
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systimer_ll_enable_alarm_oneshot(alarm_id);
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break;
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case SYSTIMER_ALARM_MODE_PERIOD:
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systimer_ll_enable_alarm_period(alarm_id);
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break;
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default:
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break;
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}
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}
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void systimer_hal_connect_alarm_counter(systimer_alarm_id_t alarm_id, systimer_counter_id_t counter_id)
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{
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systimer_ll_connect_alarm_counter(alarm_id, counter_id);
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}
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