// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <stdbool.h> #include "sdkconfig.h" #include "soc/soc.h" #include "soc/cpu.h" #include "soc/rtc_periph.h" #include "esp32/rom/ets_sys.h" #include "esp_private/system_internal.h" #include "driver/rtc_cntl.h" #include "freertos/FreeRTOS.h" #ifdef CONFIG_ESP32_BROWNOUT_DET_LVL #define BROWNOUT_DET_LVL CONFIG_ESP32_BROWNOUT_DET_LVL #else #define BROWNOUT_DET_LVL 0 #endif //CONFIG_ESP32_BROWNOUT_DET_LVL 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. */ REG_WRITE(RTC_CNTL_INT_CLR_REG, RTC_CNTL_BROWN_OUT_INT_CLR); /* Stall the other CPU to make sure the code running there doesn't use UART * at the same time as the following ets_printf. */ esp_cpu_stall(!xPortGetCoreID()); esp_reset_reason_set_hint(ESP_RST_BROWNOUT); ets_printf("\r\nBrownout detector was triggered\r\n\r\n"); esp_restart_noos(); } void esp_brownout_init(void) { REG_WRITE(RTC_CNTL_BROWN_OUT_REG, RTC_CNTL_BROWN_OUT_ENA /* Enable BOD */ | RTC_CNTL_BROWN_OUT_PD_RF_ENA /* Automatically power down RF */ /* Reset timeout must be set to >1 even if BOR feature is not used */ | (2 << RTC_CNTL_BROWN_OUT_RST_WAIT_S) | (BROWNOUT_DET_LVL << RTC_CNTL_DBROWN_OUT_THRES_S)); ESP_ERROR_CHECK( rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M) ); REG_SET_BIT(RTC_CNTL_INT_ENA_REG, RTC_CNTL_BROWN_OUT_INT_ENA_M); }