RTOS_SDK Emulation Trap

[gustavomassa]

Hello,

I'm facing a lot of Emulation Trap while debugging with gdbstub.
It happens when I try to change the wifi operation mode/config.

User Case: Start wifi mode as STATIONAP_MODE, with ap_hidden = true, after 10 not_found_ap_count, creates a task that will disable wifi_station_reconnect_policy and set ap_hidden = false. When trying to change any mode/config of wifi STATIONAP_MODE (it also happens for STATION and SOFTAP modes), it results on an Emulation Trap.

Code: Select all

bool wifi_set_mode(WIFI_MODE mode){
    if(!mode){
        bool s = wifi_set_opmode(mode);
        wifi_fpm_open();
        wifi_fpm_set_sleep_type(MODEM_SLEEP_T);
        wifi_fpm_do_sleep(0xFFFFFFFF);
        wifi_fpm_close();
        return s;
    }
    return wifi_set_opmode(mode);
}

bool wifi_ap_set_visible(bool value) {
   struct softap_config config;
   if(!wifi_softap_get_config(&config)) {
      IOT_ERROR("Failed to get softAP config");
      return false;
   }
   //check value
   if(value) {
      config.ssid_hidden = false;
   } else {
      config.ssid_hidden = true;
   }
   if(!wifi_softap_set_config(&config)) {
      IOT_ERROR("Failed to set softAP config");
      return false;
   }
   return true;
}

void wifi_event_handler_cb(System_Event_t *event)
{
    static bool station_was_connected = false;
    if (event == NULL) {
        return;
    }

    switch (event->event_id) {
        case EVENT_STAMODE_DISCONNECTED:
            wifi_station_is_connected = false;
            Event_StaMode_Disconnected_t *ev = (Event_StaMode_Disconnected_t *)&event->event_info;
            if(ev != NULL) {
               //notify callback
            if(on_station_disconnect){
               on_station_disconnect(ev->reason);
            }

                //check ap not found count
               if(ev->reason == REASON_NO_AP_FOUND) {
                  ++wifi_ap_not_found_count;
                  if(wifi_ap_not_found_count >= 10) {
                     //call smart config
                     init_smart_config();
                     //reset ap not found count
                     wifi_ap_not_found_count = 0;
                  }
               }

               //check auth fail count
               if(ev->reason == REASON_AUTH_FAIL) {
                  ++wifi_auth_fail_count;
                  if(wifi_auth_fail_count >= 10) {
                     //call smart config
                     init_smart_config();
                     //reset count
                     wifi_auth_fail_count = 0;
                  }
               }
            } else {
               IOT_ERROR("Event_StaMode_Disconnected_t is NULL");
            }
            break;
        case EVENT_STAMODE_CONNECTED:
            if(wifi_station_static_ip){
                wifi_station_is_connected = true;
                if(!station_was_connected){
                    station_was_connected = true;
                    //notify first connection callback
                    if(on_station_first_connect){
                        on_station_first_connect();
                    }
                }
                //notify callback
                if(on_station_connect){
                    on_station_connect();
                }
            }
            break;
        case EVENT_STAMODE_DHCP_TIMEOUT:
            if(wifi_station_is_connected){
                wifi_station_is_connected = false;
                if(on_station_disconnect){
                    on_station_disconnect(REASON_UNSPECIFIED);
                }
            }
            break;
        case EVENT_STAMODE_GOT_IP:
            wifi_station_is_connected = true;
            if(!station_was_connected){
                station_was_connected = true;
                if(on_station_first_connect){
                    on_station_first_connect();
                }
            }
            if(on_station_connect){
                on_station_connect();
            }
            break;

        case EVENT_SOFTAPMODE_STACONNECTED:
            if(on_client_connect){
                on_client_connect();
            }
            break;
        case EVENT_SOFTAPMODE_STADISCONNECTED:
            if(on_client_disconnect){
                on_client_disconnect();
            }
            break;
        default:
            break;
    }
}

void init_wifi_controller(){
    wifi_set_event_handler_cb(wifi_event_handler_cb);
    //initial config for wifi ap and station
    wifi_station_set_reconnect_policy(true);
    wifi_station_set_auto_connect(true);
    wifi_ap_set_visible(false);
    if(!wifi_set_mode(STATIONAP_MODE)) {
       IOT_ERROR("Failed to set STATIONAP_MODE mode");
    }
    if(!wifi_station_dhcpc_status()){
       IOT_DEBUG("DHCP client is not started, starting it...");
        if(!wifi_station_dhcpc_start()){
           IOT_ERROR("DHCP client start failed");
        }
    }
    wifi_station_connect();
}

LOCAL void smart_config_task(void *pvParameter) {
   wifi_station_set_reconnect_policy(false);
   wifi_station_disconnect();

   //EMULATION TRAP HAPPENS HERE INTERNALLY..
   wifi_ap_set_visible(true);

   portTickType xLastWakeTime = xTaskGetTickCount();

   for(;;) {
      //vTaskDelay(5000 / portTICK_RATE_MS);
      vTaskDelayUntil(&xLastWakeTime, 5000 / portTICK_RATE_MS);
   }

}

void init_smart_config() {
   if(smartConfigTaskControllerHandle == NULL) {
      //create smart config task
      portBASE_TYPE xReturned;
      xReturned = xTaskCreate(smart_config_task, (const signed char * const )"smart_config_task", 256, NULL, tskIDLE_PRIORITY + 1, &smartConfigTaskControllerHandle);
      if( xReturned != pdPASS ) {
         IOT_ERROR("Could not create smart_config task: %d", (int32)xReturned);
      }
   }
}

void user_init(void) {
   uart_init();

   #ifdef DEBUG
   gdbstub_init();
   initiMemoryDump();
   #endif

   init_wifi_controller();
}

Please let me know if you need more information.

Thanks
Regards

[gustavomassa]

UPDATE: I've fixed the Emulation Trap issue. What was causing it were the wifi functions: wifi_softap_set_config and wifi_station_set_config
I was defining the config struct from scratch instead of getting the saved config from the ROM and then updating just the necessary attributes. The problem has something to do with the softAP channel when using softap+station mode.
Anyway these set_config functions should be updated to avoid that kind of undefined executions.

Here is the working code:

Code: Select all

LOCAL void smart_config_task(void *pvParameter) {
   //disconnect station mode
   wifi_station_set_reconnect_policy(false);
   wifi_station_disconnect();

   //now enable both station and ap mode
   wifi_start_ap("test1234");

   portTickType xLastWakeTime = xTaskGetTickCount();

   for(;;) {
      vTaskDelayUntil(&xLastWakeTime, 5000 / portTICK_RATE_MS);
   }

bool wifi_start_ap(const char *pass) {
   //for security issues, must have password with at least 8 characters for WPA
   if(!pass || strcmp(pass, "") == 0 || strlen(pass) < 8) {
      IOT_ERROR("NULL/Empty/Short password");
       return false;
   }
   //set ap mode
    WIFI_MODE mode = wifi_get_opmode();
    if((mode & SOFTAP_MODE) == 0){
        mode |= SOFTAP_MODE;
        if(!wifi_set_mode(mode)){
           IOT_ERROR("Failed to enable AP mode");
            return false;
        }
    }
   
   //get saved config
   struct softap_config config;
   if(!wifi_softap_get_config_default(&config)) {
       IOT_ERROR("Failed to get SoftAP config");
       return false;
   }
   //update values
   sprintf((char *)config.ssid, "ESP8266");
   sprintf((char *)config.password, pass);
   config.ssid_len = 0;
   config.authmode = AUTH_WPA_WPA2_PSK;
   config.max_connection = 1;

   //save new config
   if(!wifi_softap_set_config(&config)) {
      IOT_ERROR("Failed to set SoftAP config");
      return false;
   }
    //check dhcp server
   if(!wifi_softap_dhcps_status()){
      IOT_DEBUG("DHCP server is not started, starting it...");
       if(!wifi_softap_dhcps_start()){
          IOT_ERROR("DHCP server start failed");
           return false;
       }
    }
    return true;
}

void init_wifi_controller(){
    wifi_set_event_handler_cb(wifi_event_handler_cb);

    //initial config for wifi ap and station
    wifi_station_set_reconnect_policy(true);
    wifi_station_set_auto_connect(true);

    if(wifi_ap_enabled()) {
        wifi_stop_ap();
    }
    if(!wifi_set_mode(STATION_MODE)) {
           IOT_ERROR("Failed to set STATION mode");
    }
    wifi_station_connect();
}

void user_init(void) {
   uart_init();

   #ifdef DEBUG
   gdbstub_init();
   initiMemoryDump();
   #endif

   init_wifi_controller();
}