198 lines
6.2 KiB
C
198 lines
6.2 KiB
C
// Copyright 2018 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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// 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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/* Recommendation of using API RTC_WDT.
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1) Setting and enabling rtc_wdt:
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@code
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rtc_wdt_protect_off();
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rtc_wdt_disable();
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rtc_wdt_set_length_of_reset_signal(RTC_WDT_SYS_RESET_SIG, RTC_WDT_LENGTH_3_2us);
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rtc_wdt_set_stage(RTC_WDT_STAGE0, RTC_WDT_STAGE_ACTION_RESET_SYSTEM); //RTC_WDT_STAGE_ACTION_RESET_SYSTEM or RTC_WDT_STAGE_ACTION_RESET_RTC
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rtc_wdt_set_time(RTC_WDT_STAGE0, 7000); // timeout rtd_wdt 7000ms.
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rtc_wdt_enable();
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rtc_wdt_protect_on();
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@endcode
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* If you use this option RTC_WDT_STAGE_ACTION_RESET_SYSTEM then after reset you can see these messages.
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They can help to understand where the CPUs were when the WDT was triggered.
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W (30) boot: PRO CPU has been reset by WDT.
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W (30) boot: WDT reset info: PRO CPU PC=0x400xxxxx
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... function where it happened
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W (31) boot: WDT reset info: APP CPU PC=0x400xxxxx
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... function where it happened
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* If you use this option RTC_WDT_STAGE_ACTION_RESET_RTC then you will see message (rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT))
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without description where were CPUs when it happened.
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2) Reset counter of rtc_wdt:
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@code
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rtc_wdt_feed();
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@endcode
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3) Disable rtc_wdt:
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@code
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rtc_wdt_disable();
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@endcode
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "soc/rtc_periph.h"
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#include "esp_err.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/// List of stage of rtc watchdog. WDT has 4 stage.
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typedef enum {
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RTC_WDT_STAGE0 = 0, /*!< Stage 0 */
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RTC_WDT_STAGE1 = 1, /*!< Stage 1 */
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RTC_WDT_STAGE2 = 2, /*!< Stage 2 */
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RTC_WDT_STAGE3 = 3 /*!< Stage 3 */
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} rtc_wdt_stage_t;
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/// List of action. When the time of stage expires this action will be triggered.
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typedef enum {
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RTC_WDT_STAGE_ACTION_OFF = RTC_WDT_STG_SEL_OFF, /*!< Disabled. This stage will have no effects on the system. */
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RTC_WDT_STAGE_ACTION_INTERRUPT = RTC_WDT_STG_SEL_INT, /*!< Trigger an interrupt. When the stage expires an interrupt is triggered. */
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RTC_WDT_STAGE_ACTION_RESET_CPU = RTC_WDT_STG_SEL_RESET_CPU, /*!< Reset a CPU core. */
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RTC_WDT_STAGE_ACTION_RESET_SYSTEM = RTC_WDT_STG_SEL_RESET_SYSTEM, /*!< Reset the main system includes the CPU and all peripherals. The RTC is an exception to this, and it will not be reset. */
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RTC_WDT_STAGE_ACTION_RESET_RTC = RTC_WDT_STG_SEL_RESET_RTC /*!< Reset the main system and the RTC. */
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} rtc_wdt_stage_action_t;
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/// Type of reset signal
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typedef enum {
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RTC_WDT_SYS_RESET_SIG = 0, /*!< System reset signal length selection */
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RTC_WDT_CPU_RESET_SIG = 1 /*!< CPU reset signal length selection */
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} rtc_wdt_reset_sig_t;
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/// Length of reset signal
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typedef enum {
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RTC_WDT_LENGTH_100ns = 0, /*!< 100 ns */
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RTC_WDT_LENGTH_200ns = 1, /*!< 200 ns */
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RTC_WDT_LENGTH_300ns = 2, /*!< 300 ns */
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RTC_WDT_LENGTH_400ns = 3, /*!< 400 ns */
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RTC_WDT_LENGTH_500ns = 4, /*!< 500 ns */
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RTC_WDT_LENGTH_800ns = 5, /*!< 800 ns */
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RTC_WDT_LENGTH_1_6us = 6, /*!< 1.6 us */
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RTC_WDT_LENGTH_3_2us = 7 /*!< 3.2 us */
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} rtc_wdt_length_sig_t;
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/**
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* @brief Get status of protect of rtc_wdt.
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*
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* @return
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* - True if the protect of RTC_WDT is set
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*/
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bool rtc_wdt_get_protect_status(void);
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/**
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* @brief Set protect of rtc_wdt.
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*/
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void rtc_wdt_protect_on(void);
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/**
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* @brief Reset protect of rtc_wdt.
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*/
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void rtc_wdt_protect_off(void);
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/**
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* @brief Enable rtc_wdt.
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*/
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void rtc_wdt_enable(void);
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/**
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* @brief Enable the flash boot protection procedure for WDT.
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*
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* Do not recommend to use it in the app.
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* This function was added to be compatibility with the old bootloaders.
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* This mode is disabled in bootloader or using rtc_wdt_disable() function.
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*/
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void rtc_wdt_flashboot_mode_enable(void);
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/**
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* @brief Disable rtc_wdt.
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*/
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void rtc_wdt_disable(void);
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/**
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* @brief Reset counter rtc_wdt.
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*
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* It returns to stage 0 and its expiry counter restarts from 0.
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*/
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void rtc_wdt_feed(void);
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/**
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* @brief Set time for required stage.
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*
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* @param[in] stage Stage of rtc_wdt.
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* @param[in] timeout_ms Timeout for this stage.
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*
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* @return
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* - ESP_OK In case of success
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* - ESP_ERR_INVALID_ARG If stage has invalid value
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*/
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esp_err_t rtc_wdt_set_time(rtc_wdt_stage_t stage, unsigned int timeout_ms);
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/**
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* @brief Get the timeout set for the required stage.
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*
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* @param[in] stage Stage of rtc_wdt.
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* @param[out] timeout_ms Timeout set for this stage. (not elapsed time).
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*
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* @return
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* - ESP_OK In case of success
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* - ESP_ERR_INVALID_ARG If stage has invalid value
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*/
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esp_err_t rtc_wdt_get_timeout(rtc_wdt_stage_t stage, unsigned int* timeout_ms);
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/**
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* @brief Set an action for required stage.
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*
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* @param[in] stage Stage of rtc_wdt.
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* @param[in] stage_sel Action for this stage. When the time of stage expires this action will be triggered.
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*
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* @return
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* - ESP_OK In case of success
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* - ESP_ERR_INVALID_ARG If stage or stage_sel have invalid value
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*/
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esp_err_t rtc_wdt_set_stage(rtc_wdt_stage_t stage, rtc_wdt_stage_action_t stage_sel);
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/**
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* @brief Set a length of reset signal.
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*
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* @param[in] reset_src Type of reset signal.
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* @param[in] reset_signal_length A length of reset signal.
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*
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* @return
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* - ESP_OK In case of success
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* - ESP_ERR_INVALID_ARG If reset_src or reset_signal_length have invalid value
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*/
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esp_err_t rtc_wdt_set_length_of_reset_signal(rtc_wdt_reset_sig_t reset_src, rtc_wdt_length_sig_t reset_signal_length);
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/**
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* @brief Return true if rtc_wdt is enabled.
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*
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* @return
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* - True rtc_wdt is enabled
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*/
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bool rtc_wdt_is_on(void);
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#ifdef __cplusplus
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}
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#endif
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