86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
// Copyright 2019 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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#include "sdkconfig.h"
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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 "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include <esp_types.h>
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#include "esp_err.h"
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#include "esp_intr_alloc.h"
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#include "esp_attr.h"
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#include "esp_freertos_hooks.h"
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#include "soc/timer_group_struct.h"
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#include "soc/timer_group_reg.h"
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#include "driver/timer.h"
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#include "driver/periph_ctrl.h"
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#include "esp_int_wdt.h"
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#if CONFIG_ESP_INT_WDT
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#define WDT_INT_NUM 24
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//Take care: the tick hook can also be called before esp_int_wdt_init() is called.
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static void IRAM_ATTR tick_hook(void)
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{
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TIMERG1.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
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TIMERG1.wdt_config2=CONFIG_ESP_INT_WDT_TIMEOUT_MS*2; //Set timeout before interrupt
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TIMERG1.wdt_config3=CONFIG_ESP_INT_WDT_TIMEOUT_MS*4; //Set timeout before reset
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TIMERG1.wdt_feed=1;
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TIMERG1.wdt_wprotect=0;
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}
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void esp_int_wdt_init(void)
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{
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periph_module_enable(PERIPH_TIMG1_MODULE);
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TIMERG1.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
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TIMERG1.wdt_config0.sys_reset_length=7; //3.2uS
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TIMERG1.wdt_config0.cpu_reset_length=7; //3.2uS
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TIMERG1.wdt_config0.level_int_en=1;
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TIMERG1.wdt_config0.stg0=TIMG_WDT_STG_SEL_INT; //1st stage timeout: interrupt
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TIMERG1.wdt_config0.stg1=TIMG_WDT_STG_SEL_RESET_SYSTEM; //2nd stage timeout: reset system
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TIMERG1.wdt_config1.clk_prescale=80*500; //Prescaler: wdt counts in ticks of 0.5mS
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//The timer configs initially are set to 5 seconds, to make sure the CPU can start up. The tick hook sets
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//it to their actual value.
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TIMERG1.wdt_config2=10000;
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TIMERG1.wdt_config3=10000;
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TIMERG1.wdt_config0.en=1;
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TIMERG1.wdt_feed=1;
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TIMERG1.wdt_wprotect=0;
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TIMERG1.int_clr.wdt=1;
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timer_group_intr_enable(TIMER_GROUP_1, TIMG_WDT_INT_ENA_M);
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}
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void esp_int_wdt_cpu_init(void)
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{
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esp_register_freertos_tick_hook_for_cpu(tick_hook, 0);
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ESP_INTR_DISABLE(WDT_INT_NUM);
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intr_matrix_set(0, ETS_TG1_WDT_LEVEL_INTR_SOURCE, WDT_INT_NUM);
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//We do not register a handler for the interrupt because it is interrupt level 4 which
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//is not servicable from C. Instead, xtensa_vectors.S has a call to the panic handler for
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//this interrupt.
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ESP_INTR_ENABLE(WDT_INT_NUM);
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}
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#endif // CONFIG_ESP_INT_WDT
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