kopia lustrzana https://github.com/espressif/esp-idf
54 wiersze
1.3 KiB
C
54 wiersze
1.3 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 <freertos/FreeRTOS.h>
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#include "soc/clk_ctrl_os.h"
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#include "sdkconfig.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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#if CONFIG_IDF_TARGET_ESP32H2
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s_rtc_clk_freq = rtc_clk_freq_cal(rtc_clk_cal(RTC_CAL_RC32K, 100));
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#else
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s_rtc_clk_freq = rtc_clk_freq_cal(rtc_clk_cal(RTC_CAL_8MD256, 100));
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#endif
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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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