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57 lines
1.7 KiB
C
57 lines
1.7 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 <freertos/FreeRTOS.h>
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#include "soc/clk_ctrl_os.h"
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#define DELAY_RTC_CLK_SWITCH 5
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static portMUX_TYPE periph_spinlock = portMUX_INITIALIZER_UNLOCKED;
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static uint8_t s_periph_ref_counts = 0;
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static uint32_t s_rtc_clk_freq = 0; // Frequency of the 8M/256 clock in Hz
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bool periph_rtc_dig_clk8m_enable(void)
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{
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portENTER_CRITICAL(&periph_spinlock);
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if (s_periph_ref_counts == 0) {
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rtc_dig_clk8m_enable();
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s_rtc_clk_freq = rtc_clk_freq_cal(rtc_clk_cal(RTC_CAL_8MD256, 100));
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if (s_rtc_clk_freq == 0) {
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portEXIT_CRITICAL(&periph_spinlock);
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return false;
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}
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}
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s_periph_ref_counts++;
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portEXIT_CRITICAL(&periph_spinlock);
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return true;
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}
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uint32_t periph_rtc_dig_clk8m_get_freq(void)
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{
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return s_rtc_clk_freq * 256;
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}
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void periph_rtc_dig_clk8m_disable(void)
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{
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portENTER_CRITICAL(&periph_spinlock);
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assert(s_periph_ref_counts > 0);
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s_periph_ref_counts--;
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if (s_periph_ref_counts == 0) {
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s_rtc_clk_freq = 0;
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rtc_dig_clk8m_disable();
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}
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portEXIT_CRITICAL(&periph_spinlock);
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}
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