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+/*
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+ * SPDX-FileCopyrightText: 2023 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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+
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+/*******************************************************************************
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+ * NOTICE
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+ * The ll is not public api, don't use in application code.
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+ * See readme.md in hal/readme.md
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+ ******************************************************************************/
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+
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+#pragma once
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+#include <stdbool.h>
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+#include "soc/rtc_cntl_struct.h"
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+#include "hal/regi2c_ctrl.h"
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+#include "soc/regi2c_brownout.h"
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+
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+#ifdef __cplusplus
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+extern "C" {
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+#endif
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+
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+/**
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+ * @brief power down the flash when a brown out happens.
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+ *
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+ * @param enable true: power down flash. false: not power down
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+ */
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+static inline void brownout_ll_enable_flash_power_down(bool enable)
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+{
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+ RTCCNTL.brown_out.close_flash_ena = enable;
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+}
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+
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+/**
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+ * @brief power down the RF circuits when a brown out happens
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+ *
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+ * @param enable true: power down. false: not power done.
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+ */
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+static inline void brownout_ll_enable_rf_power_down(bool enable)
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+{
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+ RTCCNTL.brown_out.pd_rf_ena = enable;
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+}
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+
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+/**
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+ * @brief Enable this to reset brown out
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+ *
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+ * @note: If brown out interrupt is used, this should be disabled.
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+ *
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+ * @param reset_ena true: enable reset. false: disable reset.
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+ * @param reset_wait brown out reset wait cycles
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+ * @param select 1: chip reset, 0: system reset
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+ */
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+static inline void brownout_ll_reset_config(bool reset_ena, uint32_t reset_wait, uint8_t select)
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+{
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+ RTCCNTL.brown_out.rst_wait = reset_wait;
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+ RTCCNTL.brown_out.rst_ena = reset_ena;
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+ RTCCNTL.brown_out.out2_ena = true;
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+ RTCCNTL.brown_out.rst_sel = select;
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+}
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+
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+/**
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+ * @brief Set brown out threshold
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+ *
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+ * @param threshold brownout threshold
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+ */
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+static inline void brownout_ll_set_threshold(uint8_t threshold)
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+{
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+ REGI2C_WRITE_MASK(I2C_BOD, I2C_BOD_THRESHOLD, threshold);
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+}
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+
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+/**
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+ * @brief Set this bit to enable the brown out detection
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+ *
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+ * @param bod_enable true: enable, false: disable
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+ */
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+static inline void brownout_ll_bod_enable(bool bod_enable)
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+{
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+ RTCCNTL.brown_out.ena = bod_enable;
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+}
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+
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+/**
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+ * @brief configure the waiting cycles before sending an interrupt
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+ *
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+ * @param cycle waiting cycles.
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+ */
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+static inline void brownout_ll_set_intr_wait_cycles(uint8_t cycle)
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+{
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+ RTCCNTL.brown_out.int_wait = cycle;
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+}
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+
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+/**
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+ * @brief Enable brown out interrupt
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+ *
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+ * @param enable true: enable, false: disable
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+ */
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+static inline void brownout_ll_intr_enable(bool enable)
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+{
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+ RTCCNTL.int_ena.rtc_brown_out = enable;
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+}
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+
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+/**
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+ * @brief Clear interrupt bits.
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+ */
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+__attribute__((always_inline))
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+static inline void brownout_ll_intr_clear(void)
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+{
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+ RTCCNTL.int_clr.rtc_brown_out = 1;
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+}
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+
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+#ifdef __cplusplus
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+}
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+#endif
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