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16677b0d3c
peripheral enable/disable usually should be managed by driver itself, so make it as espressif private APIs, not recommended for user to use it in application code. However, if user want to re-write the driver or ports to other platform, this is still possible by including the header in this way: "esp_private/peripheral_ctrl.h"
42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "test_utils.h"
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#include "esp_private/periph_ctrl.h"
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#include "soc/periph_defs.h"
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#include "hal/timer_hal.h"
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#include "hal/timer_ll.h"
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#define TIMER_GROUP_ID (1)
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#define TIMER_ID (0)
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static timer_hal_context_t timer_hal;
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void ref_clock_init(void)
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{
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periph_module_enable(PERIPH_TIMG1_MODULE);
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timer_hal_init(&timer_hal, TIMER_GROUP_ID, TIMER_ID);
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timer_ll_set_clock_source(timer_hal.dev, TIMER_ID, GPTIMER_CLK_SRC_XTAL); // Select XTAL, so ref_clock is independent of the APL clock
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timer_ll_enable_counter(timer_hal.dev, TIMER_ID, false); // stop timer from running
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timer_ll_set_clock_prescale(timer_hal.dev, TIMER_ID, 40); // Resolution is configured to 1MHz
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timer_ll_set_count_direction(timer_hal.dev, timer_hal.timer_id, GPTIMER_COUNT_UP); // increase mode
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timer_hal_set_counter_value(&timer_hal, 0); // initial count value to zero
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timer_ll_enable_intr(timer_hal.dev, TIMER_LL_EVENT_ALARM(TIMER_ID), false); // disable interrupt
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timer_ll_enable_alarm(timer_hal.dev, TIMER_ID, false); // alarm event is not needed
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timer_ll_enable_auto_reload(timer_hal.dev, TIMER_ID, false);
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timer_ll_enable_counter(timer_hal.dev, TIMER_ID, true); // start counter
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}
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void ref_clock_deinit(void)
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{
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timer_ll_enable_counter(timer_hal.dev, TIMER_ID, false); // stop timer from running
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periph_module_disable(PERIPH_TIMG1_MODULE);
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}
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uint64_t ref_clock_get(void)
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{
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return timer_ll_get_counter_value(timer_hal.dev, timer_hal.timer_id);
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}
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