ESP-IDF
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Outline
#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_macros.h"
#include "esp_log.h"
#include "esp_cpu.h"
#include "soc/soc.h"
#include "soc/rtc_periph.h"
#include "esp_attr.h"
#include "esp_rom_sys.h"
#include "bootloader_flash.h"
#include "esp_intr_alloc.h"
#include "hal/brownout_hal.h"
#include "hal/brownout_ll.h"
#include "sdkconfig.h"
#include "esp_rom_uart.h"
#include "hal/uart_ll.h"
#define BROWNOUT_DET_LVL
#define BROWNOUT_DET_LVL
TAG
rtc_brownout_isr_handler(void *)
esp_brownout_init()
esp_brownout_disable()
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/esp_system/port/brownout.c
 
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/* * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #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_macros.h" #include "esp_log.h" #include "esp_cpu.h" #include "soc/soc.h" #include "soc/rtc_periph.h" #include "esp_attr.h" #include "esp_rom_sys.h" #include "bootloader_flash.h" #include "esp_intr_alloc.h" #include "hal/brownout_hal.h" #include "hal/brownout_ll.h" #include "sdkconfig.h" #include "esp_rom_uart.h" #include "hal/uart_ll.h"21 includes #if defined(CONFIG_ESP_BROWNOUT_DET_LVL) #define BROWNOUT_DET_LVL CONFIG_ESP_BROWNOUT_DET_LVL #else #define BROWNOUT_DET_LVL 0 #endif static __attribute__((unused)) DRAM_ATTR const char TAG[] = "BOD"; #if CONFIG_ESP_SYSTEM_BROWNOUT_INTR IRAM_ATTR static void rtc_brownout_isr_handler(void *arg) { /* 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_ll_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_DRAM_LOGI(TAG, "Brownout detector was triggered\r\n\r\n"); }{...} // Flush any data left in UART FIFOs for (int i = 0; i < SOC_UART_HP_NUM; ++i) { if (uart_ll_is_enabled(i)) { esp_rom_output_tx_wait_idle(i); }{...} }{...} esp_rom_software_reset_system(); ESP_INFINITE_LOOP(); }{ ... } /* ... */#endif // CONFIG_ESP_SYSTEM_BROWNOUT_INTR void esp_brownout_init(void) { #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_ll_intr_clear(); #if CONFIG_IDF_TARGET_ESP32C6 || CONFIG_IDF_TARGET_ESP32H2 || CONFIG_IDF_TARGET_ESP32C5 || CONFIG_IDF_TARGET_ESP32C61 // TODO IDF-6606: LP_RTC_TIMER interrupt source is shared by lp_timer and brownout detector, but lp_timer interrupt // is not used now. An interrupt allocator is needed when lp_timer intr gets supported. esp_intr_alloc_intrstatus(ETS_LP_RTC_TIMER_INTR_SOURCE, ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_SHARED, (uint32_t)brownout_ll_intr_get_status_reg(), BROWNOUT_DETECTOR_LL_INTERRUPT_MASK, &rtc_brownout_isr_handler, NULL, NULL);/* ... */ #elif CONFIG_IDF_TARGET_ESP32P4 esp_intr_alloc(ETS_LP_ANAPERI_INTR_SOURCE, ESP_INTR_FLAG_IRAM, &rtc_brownout_isr_handler, NULL, NULL); #else rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M, RTC_INTR_FLAG_IRAM); #endif brownout_ll_intr_enable(true); /* ... */ #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, }{...}; brownout_hal_config(&cfg);/* ... */ #endif }{ ... } void esp_brownout_disable(void) { brownout_hal_config_t cfg = { .enabled = false, }{...}; brownout_hal_config(&cfg); #if CONFIG_ESP_SYSTEM_BROWNOUT_INTR brownout_ll_intr_enable(false); rtc_isr_deregister(rtc_brownout_isr_handler, NULL);/* ... */ #endif // CONFIG_ESP_SYSTEM_BROWNOUT_INTR }{ ... }
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