BMP280, wifi connection and http server /temp
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#include <stdio.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <esp_system.h>
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#include <bmp280.h>
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#include <string.h>
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#include "freertos/event_groups.h"
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#include "esp_event.h"
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#include "esp_wifi.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "esp_http_server.h"
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#define I2C_MASTER_SDA 19
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#define I2C_MASTER_SCL 23
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#define WIFI_CONNECTED_BIT BIT0
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#define WIFI_FAIL_BIT BIT1
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#define WIFI_SSID "TP-Link_8D0E"
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#define WIFI_PASS "49824643"
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static const char *TAG = "thermo_sensor";
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static EventGroupHandle_t s_wifi_event_group;
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static float last_temperature = 0.0f;
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static void wifi_event_handler(void* arg, esp_event_base_t event_base,
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int32_t event_id, void* event_data)
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{
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static int s_retry_num = 0;
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if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
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esp_wifi_connect();
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} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
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if (s_retry_num < 5) {
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esp_wifi_connect();
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s_retry_num++;
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ESP_LOGI(TAG, "Ponawianie połączenia z AP...");
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} else {
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xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
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}
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ESP_LOGI(TAG, "Połączenie z AP nie powiodło się");
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} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
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ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
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ESP_LOGI(TAG, "Uzyskano IP:" IPSTR, IP2STR(&event->ip_info.ip));
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s_retry_num = 0;
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xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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}
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}
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void wifi_init_sta(void)
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{
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s_wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK(esp_netif_init());
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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esp_netif_create_default_wifi_sta();
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK(esp_wifi_init(&cfg));
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esp_event_handler_instance_t instance_any_id;
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esp_event_handler_instance_t instance_got_ip;
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ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
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ESP_EVENT_ANY_ID,
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&wifi_event_handler,
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NULL,
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&instance_any_id));
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ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
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IP_EVENT_STA_GOT_IP,
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&wifi_event_handler,
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NULL,
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&instance_got_ip));
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = WIFI_SSID,
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.password = WIFI_PASS,
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},
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};
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
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ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
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ESP_ERROR_CHECK(esp_wifi_start());
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ESP_LOGI(TAG, "Inicjalizacja wifi_init_sta zakończona.");
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// Czekaj na połączenie lub błąd
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EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
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WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
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pdFALSE,
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pdFALSE,
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portMAX_DELAY);
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if (bits & WIFI_CONNECTED_BIT) {
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ESP_LOGI(TAG, "Połączono z sieci AP SSID:%s", WIFI_SSID);
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} else if (bits & WIFI_FAIL_BIT) {
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ESP_LOGI(TAG, "Błąd połączenia z SSID:%s", WIFI_SSID);
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} else {
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ESP_LOGE(TAG, "NIEOCZEKIWANE ZDARZENIE");
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}
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}
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void bmp280_test(void *pvParameters)
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{
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bmp280_params_t params;
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bmp280_init_default_params(¶ms);
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bmp280_t dev;
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memset(&dev, 0, sizeof(bmp280_t));
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ESP_ERROR_CHECK(bmp280_init_desc(&dev, BMP280_I2C_ADDRESS_0, 0, I2C_MASTER_SDA, I2C_MASTER_SCL));
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ESP_ERROR_CHECK(bmp280_init(&dev, ¶ms));
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bool bme280p = dev.id == BME280_CHIP_ID;
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printf("BMP280: found %s\n", bme280p ? "BME280" : "BMP280");
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float pressure, temperature, humidity;
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while (1)
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{
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vTaskDelay(pdMS_TO_TICKS(500));
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if (bmp280_read_float(&dev, &temperature, &pressure, &humidity) != ESP_OK)
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{
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printf("Temperature/pressure reading failed\n");
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continue;
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}
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/* float is used in printf(). you need non-default configuration in
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* sdkconfig for ESP8266, which is enabled by default for this
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* example. see sdkconfig.defaults.esp8266
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*/
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last_temperature = temperature;
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printf("Pressure: %.2f Pa, Temperature: %.2f C", pressure, temperature);
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if (bme280p)
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printf(", Humidity: %.2f\n", humidity);
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else
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printf("\n");
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}
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}
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static esp_err_t get_temp_handler(httpd_req_t *req)
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{
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float current_temp = last_temperature;
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char response_json[64];
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snprintf(response_json, sizeof(response_json), "{\"temperature\": %.1f}", current_temp);
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httpd_resp_set_type(req, "application/json");
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httpd_resp_send(req, response_json, HTTPD_RESP_USE_STRLEN);
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return ESP_OK;
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}
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static const httpd_uri_t temp_uri = {
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.uri = "/temp",
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.method = HTTP_GET,
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.handler = get_temp_handler,
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.user_ctx = NULL
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};
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httpd_handle_t start_webserver(void)
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{
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httpd_handle_t server = NULL;
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httpd_config_t config = HTTPD_DEFAULT_CONFIG();
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ESP_LOGI(TAG, "Uruchamianie serwera na porcie: %d", config.server_port);
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if (httpd_start(&server, &config) == ESP_OK) {
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// Rejestracja handlera dla GET /temp
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httpd_register_uri_handler(server, &temp_uri);
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return server;
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}
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ESP_LOGE(TAG, "Błąd podczas uruchamiania serwera!");
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return NULL;
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}
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void app_main()
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{
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK(ret);
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wifi_init_sta();
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start_webserver();
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ESP_ERROR_CHECK(i2cdev_init());
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xTaskCreatePinnedToCore(bmp280_test, "bmp280_test", configMINIMAL_STACK_SIZE * 8, NULL, 5, NULL, APP_CPU_NUM);
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}
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