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01b185977c
Because of errata related to BOD reset function, brownout is handled as follows: - attach an ISR to brownout interrupt - when ISR happens, print a message and do a software restart - esp_restart_nonos enables RTC watchdog, so if restart fails, there will be one more attempt to restart (using the RTC watchdog)
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "sdkconfig.h"
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#include "soc/soc.h"
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#include "soc/cpu.h"
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#include "soc/rtc_cntl_reg.h"
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#include "rom/ets_sys.h"
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#include "esp_system.h"
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#include "driver/rtc_cntl.h"
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#include "freertos/FreeRTOS.h"
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#ifdef CONFIG_BROWNOUT_DET_LVL
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#define BROWNOUT_DET_LVL CONFIG_BROWNOUT_DET_LVL
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#else
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#define BROWNOUT_DET_LVL 0
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#endif //CONFIG_BROWNOUT_DET_LVL
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static void rtc_brownout_isr_handler()
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{
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/* Normally RTC ISR clears the interrupt flag after the application-supplied
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* handler returns. Since restart is called here, the flag needs to be
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* cleared manually.
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*/
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REG_WRITE(RTC_CNTL_INT_CLR_REG, RTC_CNTL_BROWN_OUT_INT_CLR);
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/* Stall the other CPU to make sure the code running there doesn't use UART
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* at the same time as the following ets_printf.
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*/
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esp_cpu_stall(!xPortGetCoreID());
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ets_printf("\r\nBrownout detector was triggered\r\n\r\n");
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esp_restart_noos();
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}
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void esp_brownout_init()
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{
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REG_WRITE(RTC_CNTL_BROWN_OUT_REG,
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RTC_CNTL_BROWN_OUT_ENA /* Enable BOD */
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| RTC_CNTL_BROWN_OUT_PD_RF_ENA /* Automatically power down RF */
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/* Reset timeout must be set to >1 even if BOR feature is not used */
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| (2 << RTC_CNTL_BROWN_OUT_RST_WAIT_S)
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| (BROWNOUT_DET_LVL << RTC_CNTL_DBROWN_OUT_THRES_S));
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ESP_ERROR_CHECK( rtc_isr_register(rtc_brownout_isr_handler, NULL, RTC_CNTL_BROWN_OUT_INT_ENA_M) );
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REG_SET_BIT(RTC_CNTL_INT_ENA_REG, RTC_CNTL_BROWN_OUT_INT_ENA_M);
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}
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