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examples: using xEventGroup bits properly

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Closes IDF-1177

* changed
  ../../wifi/getting_started/station/README.md
  ../../wifi/getting_started/station/main/station_example_main.c
This commit is contained in:
Jakob Hasse
2020-01-02 18:53:49 +08:00
parent 97c8b90083
commit bcefbb03ad
3 changed files with 146 additions and 78 deletions
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50
examples/protocols/esp_local_ctrl/main/app_main.c
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@@ -32,9 +32,11 @@
/* FreeRTOS event group to signal when we are connected*/
static EventGroupHandle_t s_wifi_event_group;
/* The event group allows multiple bits for each event, but we only care about one event
* - are we connected to the AP with an IP? */
const int WIFI_CONNECTED_BIT = BIT0;
/* The event group allows multiple bits for each event, but we only care about two events:
* - we are connected to the AP with an IP
* - we failed to connect after the maximum amount of retries */
#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT BIT1
static const char *TAG = "local_ctrl_example";
@@ -48,9 +50,10 @@ static void event_handler(void* arg, esp_event_base_t event_base,
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
if (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY) {
esp_wifi_connect();
xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
s_retry_num++;
ESP_LOGI(TAG, "retry to connect to the AP");
} else {
xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
}
ESP_LOGI(TAG,"connect to the AP fail");
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
@@ -61,8 +64,9 @@ static void event_handler(void* arg, esp_event_base_t event_base,
}
}
void wifi_init_sta(void)
esp_err_t wifi_init_sta(void)
{
esp_err_t ret_value = ESP_OK;
s_wifi_event_group = xEventGroupCreate();
ESP_ERROR_CHECK(esp_netif_init());
@@ -88,8 +92,33 @@ void wifi_init_sta(void)
ESP_ERROR_CHECK(esp_wifi_start() );
ESP_LOGI(TAG, "wifi_init_sta finished.");
ESP_LOGI(TAG, "connect to ap SSID:%s password:%s",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
pdFALSE,
pdFALSE,
portMAX_DELAY);
/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually
* happened. */
if (bits & WIFI_CONNECTED_BIT) {
ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
ret_value = ESP_FAIL;
} else {
ESP_LOGE(TAG, "UNEXPECTED EVENT");
ret_value = ESP_ERR_INVALID_STATE;
}
ESP_ERROR_CHECK(esp_event_handler_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler));
ESP_ERROR_CHECK(esp_event_handler_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler));
vEventGroupDelete(s_wifi_event_group);
return ret_value;
}
/* Function responsible for configuring and starting the esp_local_ctrl service.
@@ -107,6 +136,9 @@ void app_main(void)
ESP_ERROR_CHECK(ret);
ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
wifi_init_sta();
start_esp_local_ctrl_service();
if (wifi_init_sta() == ESP_OK) {
start_esp_local_ctrl_service();
} else {
ESP_LOGI(TAG, "Connection failed, not starting esp_local_ctrl service");
}
}