esp-idf/components/esp_system/port/brownout.c

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/*
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* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include "esp_private/system_internal.h"
#include "driver/rtc_cntl.h"
#include "esp_rom_sys.h"
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#include "soc/soc.h"
#include "esp_cpu.h"
#include "soc/rtc_periph.h"
#include "hal/cpu_hal.h"
#include "hal/brownout_hal.h"
#include "sdkconfig.h"
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#if defined(CONFIG_ESP_BROWNOUT_DET_LVL)
#define BROWNOUT_DET_LVL CONFIG_ESP_BROWNOUT_DET_LVL
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#else
#define BROWNOUT_DET_LVL 0
#endif
#if SOC_BROWNOUT_RESET_SUPPORTED
#define BROWNOUT_RESET_EN true
#else
#define BROWNOUT_RESET_EN false
#endif // SOC_BROWNOUT_RESET_SUPPORTED
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#ifndef SOC_BROWNOUT_RESET_SUPPORTED
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static void rtc_brownout_isr_handler(void *arg)
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{
/* Normally RTC ISR clears the interrupt flag after the application-supplied
* handler returns. Since restart is called here, the flag needs to be
* cleared manually.
*/
brownout_hal_intr_clear();
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/* Stall the other CPU to make sure the code running there doesn't use UART
* at the same time as the following esp_rom_printf.
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*/
esp_cpu_stall(!cpu_hal_get_core_id());
esp_reset_reason_set_hint(ESP_RST_BROWNOUT);
esp_rom_printf("\r\nBrownout detector was triggered\r\n\r\n");
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esp_restart_noos();
}
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#endif // not SOC_BROWNOUT_RESET_SUPPORTED
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void esp_brownout_init(void)
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{
brownout_hal_config_t cfg = {
.threshold = BROWNOUT_DET_LVL,
.enabled = true,
.reset_enabled = BROWNOUT_RESET_EN,
.flash_power_down = true,
.rf_power_down = true,
};
brownout_hal_config(&cfg);
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#ifndef SOC_BROWNOUT_RESET_SUPPORTED
rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M);
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brownout_hal_intr_enable(true);
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#endif // not SOC_BROWNOUT_RESET_SUPPORTED
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}
void esp_brownout_disable(void)
{
brownout_hal_config_t cfg = {
.enabled = false,
};
brownout_hal_config(&cfg);
#ifndef SOC_BROWNOUT_RESET_SUPPORTED
brownout_hal_intr_enable(false);
rtc_isr_deregister(rtc_brownout_isr_handler, NULL);
#endif // not SOC_BROWNOUT_RESET_SUPPORTED
}