esp-idf/examples/common_components/protocol_examples_common/connect.c

/* Common functions for protocol examples, to establish Wi-Fi or Ethernet connection.

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
 */

#include <string.h>
#include "protocol_examples_common.h"
#include "sdkconfig.h"
#include "esp_event.h"
#include "esp_wifi.h"
#include "esp_eth.h"
#include "esp_log.h"
#include "tcpip_adapter.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "lwip/err.h"
#include "lwip/sys.h"

#define GOT_IPV4_BIT  BIT(0)
#define GOT_IPV6_BIT  BIT(1)

#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
#define CONNECTED_BITS  (GOT_IPV4_BIT | GOT_IPV6_BIT)
#else
#define CONNECTED_BITS  (GOT_IPV4_BIT)
#endif

static EventGroupHandle_t s_connect_event_group;
static ip4_addr_t s_ip_addr;
static const char* s_connection_name;

#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
static ip6_addr_t s_ipv6_addr;
#endif


static const char *TAG = "example_connect";

/* set up connection, Wi-Fi or Ethernet */
static void start();

/* tear down connection, release resources */
static void stop();

static void on_got_ip(void* arg, esp_event_base_t event_base,
                      int32_t event_id, void* event_data)
{
    ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
    memcpy(&s_ip_addr, &event->ip_info.ip, sizeof(s_ip_addr));
    xEventGroupSetBits(s_connect_event_group, GOT_IPV4_BIT);
}

#ifdef CONFIG_EXAMPLE_CONNECT_IPV6

static void on_got_ipv6(void* arg, esp_event_base_t event_base,
                        int32_t event_id, void* event_data)
{
    ip_event_got_ip6_t* event = (ip_event_got_ip6_t*) event_data;
    memcpy(&s_ipv6_addr, &event->ip6_info.ip, sizeof(s_ipv6_addr));
    xEventGroupSetBits(s_connect_event_group, GOT_IPV6_BIT);
}

#endif // CONFIG_EXAMPLE_CONNECT_IPV6

esp_err_t example_connect()
{
    if (s_connect_event_group != NULL) {
        return ESP_ERR_INVALID_STATE;
    }
    s_connect_event_group = xEventGroupCreate();
    start();
    xEventGroupWaitBits(s_connect_event_group, CONNECTED_BITS, true, true, portMAX_DELAY);
    ESP_LOGI(TAG, "Connected to %s", s_connection_name);
    ESP_LOGI(TAG, "IPv4 address: " IPSTR, IP2STR(&s_ip_addr));
#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
    ESP_LOGI(TAG, "IPv6 address: " IPV6STR, IPV62STR(s_ipv6_addr));
#endif
    return ESP_OK;
}

esp_err_t example_disconnect()
{
    if (s_connect_event_group == NULL) {
        return ESP_ERR_INVALID_STATE;
    }
    vEventGroupDelete(s_connect_event_group);
    s_connect_event_group = NULL;
    stop();
    ESP_LOGI(TAG, "Disconnected from %s", s_connection_name);
    s_connection_name = NULL;
    return ESP_OK;
}

#ifdef CONFIG_EXAMPLE_CONNECT_WIFI

static void on_wifi_disconnect(void* arg, esp_event_base_t event_base,
                               int32_t event_id, void* event_data)
{
    ESP_LOGI(TAG, "Wi-Fi disconnected, trying to reconnect...");
    ESP_ERROR_CHECK( esp_wifi_connect() );
}

#ifdef CONFIG_EXAMPLE_CONNECT_IPV6

static void on_wifi_connect(void* arg, esp_event_base_t event_base,
                            int32_t event_id, void* event_data)
{
    tcpip_adapter_create_ip6_linklocal(TCPIP_ADAPTER_IF_STA);
}

#endif // CONFIG_EXAMPLE_CONNECT_IPV6

static void start()
{
    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));

    ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &on_wifi_disconnect, NULL));
    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &on_got_ip, NULL));
#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
    ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_CONNECTED, &on_wifi_connect, NULL));
    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_GOT_IP6, &on_got_ipv6, NULL));
#endif

    ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
    wifi_config_t wifi_config = {
        .sta = {
            .ssid = CONFIG_EXAMPLE_WIFI_SSID,
            .password = CONFIG_EXAMPLE_WIFI_PASSWORD,
        },
    };
    ESP_LOGI(TAG, "Connecting to %s...", wifi_config.sta.ssid);
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
    ESP_ERROR_CHECK(esp_wifi_start());
    ESP_ERROR_CHECK(esp_wifi_connect());
    s_connection_name = CONFIG_EXAMPLE_WIFI_SSID;
}

static void stop()
{
    ESP_ERROR_CHECK(esp_event_handler_unregister(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &on_wifi_disconnect));
    ESP_ERROR_CHECK(esp_event_handler_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, &on_got_ip));
#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
    ESP_ERROR_CHECK(esp_event_handler_unregister(IP_EVENT, IP_EVENT_GOT_IP6, &on_got_ipv6));
    ESP_ERROR_CHECK(esp_event_handler_unregister(WIFI_EVENT, WIFI_EVENT_STA_CONNECTED, &on_wifi_connect));
#endif
    ESP_ERROR_CHECK(esp_wifi_stop());
    ESP_ERROR_CHECK(esp_wifi_deinit());
}
#endif // CONFIG_EXAMPLE_CONNECT_WIFI


#ifdef CONFIG_EXAMPLE_CONNECT_ETHERNET

#include "driver/gpio.h"

#ifdef CONFIG_PHY_LAN8720
#include "eth_phy/phy_lan8720.h"
#define DEFAULT_ETHERNET_PHY_CONFIG phy_lan8720_default_ethernet_config
#endif
#ifdef CONFIG_PHY_TLK110
#include "eth_phy/phy_tlk110.h"
#define DEFAULT_ETHERNET_PHY_CONFIG phy_tlk110_default_ethernet_config
#elif CONFIG_PHY_IP101
#include "eth_phy/phy_ip101.h"
#define DEFAULT_ETHERNET_PHY_CONFIG phy_ip101_default_ethernet_config
#endif

#define PIN_PHY_POWER CONFIG_PHY_POWER_PIN
#define PIN_SMI_MDC CONFIG_PHY_SMI_MDC_PIN
#define PIN_SMI_MDIO CONFIG_PHY_SMI_MDIO_PIN

#ifdef CONFIG_PHY_USE_POWER_PIN
/**
 * @brief re-define power enable func for phy
 *
 * @param enable true to enable, false to disable
 *
 * @note This function replaces the default PHY power on/off function.
 * If this GPIO is not connected on your device (and PHY is always powered),
 * you can use the default PHY-specific power on/off function.
 */
static void phy_device_power_enable_via_gpio(bool enable)
{
    assert(DEFAULT_ETHERNET_PHY_CONFIG.phy_power_enable);

    if (!enable) {
        DEFAULT_ETHERNET_PHY_CONFIG.phy_power_enable(false);
    }

    gpio_pad_select_gpio(PIN_PHY_POWER);
    gpio_set_direction(PIN_PHY_POWER, GPIO_MODE_OUTPUT);
    if (enable == true) {
        gpio_set_level(PIN_PHY_POWER, 1);
        ESP_LOGI(TAG, "Power On Ethernet PHY");
    } else {
        gpio_set_level(PIN_PHY_POWER, 0);
        ESP_LOGI(TAG, "Power Off Ethernet PHY");
    }

    vTaskDelay(1); // Allow the power up/down to take effect, min 300us

    if (enable) {
        /* call the default PHY-specific power on function */
        DEFAULT_ETHERNET_PHY_CONFIG.phy_power_enable(true);
    }
}
#endif

/**
 * @brief gpio specific init
 *
 * @note RMII data pins are fixed in esp32:
 * TXD0 <=> GPIO19
 * TXD1 <=> GPIO22
 * TX_EN <=> GPIO21
 * RXD0 <=> GPIO25
 * RXD1 <=> GPIO26
 * CLK <=> GPIO0
 *
 */
static void eth_gpio_config_rmii(void)
{
    phy_rmii_configure_data_interface_pins();
    phy_rmii_smi_configure_pins(PIN_SMI_MDC, PIN_SMI_MDIO);
}

#ifdef CONFIG_EXAMPLE_CONNECT_IPV6

/** Event handler for Ethernet events */
static void on_eth_event(void* arg, esp_event_base_t event_base, 
                         int32_t event_id, void* event_data)
{
    switch (event_id) {
    case ETHERNET_EVENT_CONNECTED:
        ESP_LOGI(TAG, "Ethernet Link Up");
        tcpip_adapter_create_ip6_linklocal(TCPIP_ADAPTER_IF_ETH);
        break;
    default:
        break;
    }
}

#endif // CONFIG_EXAMPLE_CONNECT_IPV6

static void start()
{
    eth_config_t config = DEFAULT_ETHERNET_PHY_CONFIG;
    config.phy_addr = CONFIG_PHY_ADDRESS;
    config.gpio_config = eth_gpio_config_rmii;
    config.tcpip_input = tcpip_adapter_eth_input;
    config.clock_mode = CONFIG_PHY_CLOCK_MODE;

#ifdef CONFIG_PHY_USE_POWER_PIN
    /* Replace the default 'power enable' function with an example-specific one
     that toggles a power GPIO. */
    config.phy_power_enable = phy_device_power_enable_via_gpio;
#endif

    ESP_ERROR_CHECK(esp_eth_init(&config));

    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &on_got_ip, NULL));
#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
    ESP_ERROR_CHECK(esp_event_handler_register(ETH_EVENT, ETHERNET_EVENT_CONNECTED, &on_eth_event, NULL));
    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_GOT_IP6, &on_got_ipv6, NULL));
#endif

    ESP_ERROR_CHECK(esp_eth_enable());

    s_connection_name = "Ethernet";
}

static void stop()
{
    ESP_ERROR_CHECK(esp_event_handler_unregister(IP_EVENT, IP_EVENT_ETH_GOT_IP, &on_got_ip));
#ifdef CONFIG_EXAMPLE_CONNECT_IPV6
    ESP_ERROR_CHECK(esp_event_handler_unregister(IP_EVENT, IP_EVENT_GOT_IP6, &on_got_ipv6));
    ESP_ERROR_CHECK(esp_event_handler_unregister(ETH_EVENT, ETHERNET_EVENT_CONNECTED, &on_eth_event));
#endif

    ESP_ERROR_CHECK(esp_eth_disable());
    ESP_ERROR_CHECK(esp_eth_deinit());
}

#endif // CONFIG_EXAMPLE_CONNECT_ETHERNET