esp-idf/components/esp32/brownout.c

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2.2 KiB
C
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// 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_cntl_reg.h"
#include "rom/ets_sys.h"
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#include "esp_system_internal.h"
#include "driver/rtc_cntl.h"
#include "freertos/FreeRTOS.h"
#ifdef CONFIG_BROWNOUT_DET_LVL
#define BROWNOUT_DET_LVL CONFIG_BROWNOUT_DET_LVL
#else
#define BROWNOUT_DET_LVL 0
#endif //CONFIG_BROWNOUT_DET_LVL
static void rtc_brownout_isr_handler()
{
/* 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());
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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()
{
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);
}