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 "esp_private/rtc_ctrl.h"
#include "esp_private/spi_flash_os.h"
#include "esp_rom_sys.h"
#include "esp_cpu.h"
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#include "soc/soc.h"
#include "soc/rtc_periph.h"
#include "esp_attr.h"
#include "bootloader_flash.h"
#include "esp_intr_alloc.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 CONFIG_ESP_SYSTEM_BROWNOUT_INTR
IRAM_ATTR 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();
// Stop the other core.
#if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE
const uint32_t core_id = esp_cpu_get_core_id();
const uint32_t other_core_id = (core_id == 0) ? 1 : 0;
esp_cpu_stall(other_core_id);
#endif
esp_reset_reason_set_hint(ESP_RST_BROWNOUT);
#if CONFIG_SPI_FLASH_BROWNOUT_RESET
if (spi_flash_brownout_need_reset()) {
bootloader_flash_reset_chip();
} else
#endif // CONFIG_SPI_FLASH_BROWNOUT_RESET
{
esp_rom_printf("\r\nBrownout detector was triggered\r\n\r\n");
}
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esp_restart_noos();
}
#endif // CONFIG_ESP_SYSTEM_BROWNOUT_INTR
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void esp_brownout_init(void)
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{
#if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
brownout_hal_config_t cfg = {
.threshold = BROWNOUT_DET_LVL,
.enabled = true,
.reset_enabled = false,
.flash_power_down = true,
.rf_power_down = true,
};
brownout_hal_config(&cfg);
brownout_hal_intr_clear();
rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M, RTC_INTR_FLAG_IRAM);
brownout_hal_intr_enable(true);
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#else // brownout without interrupt
brownout_hal_config_t cfg = {
.threshold = BROWNOUT_DET_LVL,
.enabled = true,
.reset_enabled = true,
.flash_power_down = true,
.rf_power_down = true,
};
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brownout_hal_config(&cfg);
#endif
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}
void esp_brownout_disable(void)
{
brownout_hal_config_t cfg = {
.enabled = false,
};
brownout_hal_config(&cfg);
#if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
brownout_hal_intr_enable(false);
rtc_isr_deregister(rtc_brownout_isr_handler, NULL);
#endif // CONFIG_ESP_SYSTEM_BROWNOUT_INTR
}