Watch dog reset problem

ESP_Faye
Posts: 1640
Joined: Mon Oct 27, 2014 11:08 am

Watch dog reset problem

Postby ESP_Faye » Fri Apr 03, 2015 3:05 pm

:arrow: :arrow: :arrow:

We suggest to use RTOS SDK which is multi-threaded.

ESP8266 SDK without RTOS is single-threaded,so using while(1) or delay_ms() (which is also a while in it) may occupy CPU too long and cause a watchdog reset.
1. If a task occupied CPU for a long time, ESP8266 can't feed the dog, will cause a watchdog reset;
2. Task should not occupy CPU more than 10 ms, otherwise may cause WiFi connection break.

Users have to use a timer to do the checking job, as user_esp_platform_check_ip below.
Notice: os_timer_setfn has to be called to set a callback when using timer.

Code: Select all

LOCAL os_timer_t test_timer;

/******************************************************************************
 * FunctionName : user_esp_platform_check_ip
 * Description  : check whether get ip addr or not
 * Parameters   : none
 * Returns      : none
*******************************************************************************/
void ICACHE_FLASH_ATTR
user_esp_platform_check_ip(void)
{
    struct ip_info ipconfig;

   //disarm timer first
    os_timer_disarm(&test_timer);

   //get ip info of ESP8266 station
    wifi_get_ip_info(STATION_IF, &ipconfig);

    if (wifi_station_get_connect_status() == STATION_GOT_IP && ipconfig.ip.addr != 0) {

      os_printf("got ip !!! \r\n");

    } else {
       
        if ((wifi_station_get_connect_status() == STATION_WRONG_PASSWORD ||
                wifi_station_get_connect_status() == STATION_NO_AP_FOUND ||
                wifi_station_get_connect_status() == STATION_CONNECT_FAIL)) {
               
         os_printf("connect fail !!! \r\n");
         
        } else {
       
           //re-arm timer to check ip
            os_timer_setfn(&test_timer, (os_timer_func_t *)user_esp_platform_check_ip, NULL);
            os_timer_arm(&test_timer, 100, 0);
        }
    }
}


/******************************************************************************
 * FunctionName : user_set_station_config
 * Description  : set the router info which ESP8266 station will connect to
 * Parameters   : none
 * Returns      : none
*******************************************************************************/
void ICACHE_FLASH_ATTR
user_set_station_config(void)
{
   // Wifi configuration
   char ssid[32] = SSID;
   char password[64] = PASSWORD;
   struct station_config stationConf;

   //need not mac address
   stationConf.bssid_set = 0;
   
   //Set ap settings
   os_memcpy(&stationConf.ssid, ssid, 32);
   os_memcpy(&stationConf.password, password, 64);
   wifi_station_set_config(&stationConf);

   //set a timer to check whether got ip from router succeed or not.
   os_timer_disarm(&test_timer);
    os_timer_setfn(&test_timer, (os_timer_func_t *)user_esp_platform_check_ip, NULL);
    os_timer_arm(&test_timer, 100, 0);

}


/******************************************************************************
 * FunctionName : user_init
 * Description  : entry of user application, init user function here
 * Parameters   : none
 * Returns      : none
*******************************************************************************/
void user_init(void)
{
    os_printf("SDK version:%s\n", system_get_sdk_version());
   
   //Set softAP + station mode
   wifi_set_opmode(STATIONAP_MODE);

   // ESP8266 connect to router.
    user_set_station_config();

}



1.在 非OS SDK 由于是单线程的,任何 task 都不能长期 占用 CPU。
(1)如果 一个 task 占用 CPU 不退出,将导致看门狗的喂狗函数无法执行,导致系统重启。
(2) 建议 一个 task 占用 CPU 不要超过 10mS,否则可能导致 WiFi 连接中断。
2. 建议用定时器来实现长时间的查询功能,定时器也可设置为循环调用,参考代码如上。请注意,使用 timer 时,必须调用os_timer_setfn 设置 timer 到时的 callback。
3. 建议用RTOS SDK,OS 会调度不同 task。每个 task 编程可认为独占 CPU。

Thanks for your interest in ESP8266 !

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