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CMakeLists.txt

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+idf_component_register(SRCS "proj5.c" "bme280.c"
+                    INCLUDE_DIRS ".")

proj5.c

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+// I2C BME280 sensor - Temperature read
+// Example:		https://github.com/ESP32Tutorials/esp32-esp-idf-mqtt-bme280/tree/main/components/bme280
+// Tutorial: 	https://esp32tutorials.com/esp32-mqtt-publish-bme280-node-red-esp-idf/#more-2125
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include "esp_system.h"
+#include "nvs_flash.h"
+#include "esp_event.h"
+#include "esp_netif.h"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+#include "freertos/queue.h"
+
+#include "lwip/sockets.h"
+#include "lwip/dns.h"
+#include "lwip/netdb.h"
+
+#include "esp_log.h"
+
+#include "driver/gpio.h"
+#include "driver/i2c.h"
+#include "esp_err.h"
+
+#include "bme280.h"
+
+#define TAG_BME280 "BME280"
+
+#define SDA_PIN GPIO_NUM_21
+#define SCL_PIN GPIO_NUM_22
+
+#define I2C_MASTER_ACK 0
+#define I2C_MASTER_NACK 1
+
+// Initialize I2C communication parameters
+void i2c_master_init()
+{
+	i2c_config_t i2c_config = {
+		.mode = I2C_MODE_MASTER,
+		.sda_io_num = SDA_PIN,
+		.scl_io_num = SCL_PIN,
+		.sda_pullup_en = GPIO_PULLUP_ENABLE,
+		.scl_pullup_en = GPIO_PULLUP_ENABLE,
+		.master.clk_speed = 1000000};
+	i2c_param_config(I2C_NUM_0, &i2c_config);
+	i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0);
+}
+
+// BME280 I2C write function
+s8 BME280_I2C_bus_write(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt)
+{
+	s32 iError = BME280_INIT_VALUE;
+
+	esp_err_t espRc;
+	i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+
+	i2c_master_start(cmd);
+	i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_WRITE, true);
+
+	i2c_master_write_byte(cmd, reg_addr, true);
+	i2c_master_write(cmd, reg_data, cnt, true);
+	i2c_master_stop(cmd);
+
+	espRc = i2c_master_cmd_begin(I2C_NUM_0, cmd, 10 / portTICK_PERIOD_MS);
+	if (espRc == ESP_OK)
+	{
+		iError = SUCCESS;
+	}
+	else
+	{
+		iError = FAIL;
+	}
+	i2c_cmd_link_delete(cmd);
+
+	return (s8)iError;
+}
+
+// BME280 I2C read function
+s8 BME280_I2C_bus_read(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt)
+{
+	s32 iError = BME280_INIT_VALUE;
+	esp_err_t espRc;
+
+	i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+
+	i2c_master_start(cmd);
+	i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_WRITE, true);
+	i2c_master_write_byte(cmd, reg_addr, true);
+
+	i2c_master_start(cmd);
+	i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_READ, true);
+
+	if (cnt > 1)
+	{
+		i2c_master_read(cmd, reg_data, cnt - 1, I2C_MASTER_ACK);
+	}
+	i2c_master_read_byte(cmd, reg_data + cnt - 1, I2C_MASTER_NACK);
+	i2c_master_stop(cmd);
+
+	espRc = i2c_master_cmd_begin(I2C_NUM_0, cmd, 10 / portTICK_PERIOD_MS);
+	if (espRc == ESP_OK)
+	{
+		iError = SUCCESS;
+	}
+	else
+	{
+		iError = FAIL;
+	}
+
+	i2c_cmd_link_delete(cmd);
+
+	return (s8)iError;
+}
+
+// BME280 I2C delay function
+void BME280_delay_msek(u32 msek)
+{
+	vTaskDelay(msek / portTICK_PERIOD_MS);
+}
+
+// BME280 I2C task
+void Publisher_Task(void *params)
+{
+	// BME280 I2C communication structure
+	struct bme280_t bme280 = {
+		.bus_write = BME280_I2C_bus_write,
+		.bus_read = BME280_I2C_bus_read,
+		.dev_addr = BME280_I2C_ADDRESS1,
+		.delay_msec = BME280_delay_msek};
+
+	s32 com_rslt;
+	s32 v_uncomp_pressure_s32;
+	s32 v_uncomp_temperature_s32;
+	s32 v_uncomp_humidity_s32;
+
+	// Initialize BME280 sensor and set internal parameters
+	com_rslt = bme280_init(&bme280);
+	printf("com_rslt %d\n", com_rslt);
+
+	com_rslt += bme280_set_oversamp_pressure(BME280_OVERSAMP_16X);
+	com_rslt += bme280_set_oversamp_temperature(BME280_OVERSAMP_2X);
+	com_rslt += bme280_set_oversamp_humidity(BME280_OVERSAMP_1X);
+
+	com_rslt += bme280_set_standby_durn(BME280_STANDBY_TIME_1_MS);
+	com_rslt += bme280_set_filter(BME280_FILTER_COEFF_16);
+
+	com_rslt += bme280_set_power_mode(BME280_NORMAL_MODE);
+	if (com_rslt == SUCCESS)
+	{
+		while (true)
+		{
+			vTaskDelay(1000 / portTICK_PERIOD_MS);
+
+			// Read BME280 data
+			com_rslt = bme280_read_uncomp_pressure_temperature_humidity(
+				&v_uncomp_pressure_s32, &v_uncomp_temperature_s32, &v_uncomp_humidity_s32);
+
+			double temp = bme280_compensate_temperature_double(v_uncomp_temperature_s32);
+			char temperature[12];
+			sprintf(temperature, "%.2f degC", temp);
+
+			double press = bme280_compensate_pressure_double(v_uncomp_pressure_s32) / 100; // Pa -> hPa
+			char pressure[10];
+			sprintf(pressure, "%.2f hPa", press);
+
+			double hum = bme280_compensate_humidity_double(v_uncomp_humidity_s32);
+			char humidity[10];
+			sprintf(humidity, "%.2f %%", hum);
+
+			// Print BME data
+			if (com_rslt == SUCCESS)
+			{
+				printf("Temperature %s\n",temperature);
+			}
+			else
+			{
+				ESP_LOGE(TAG_BME280, "measure error. code: %d", com_rslt);
+			}
+		}
+	}
+	else
+	{
+		ESP_LOGE(TAG_BME280, "init or setting error. code: %d", com_rslt);
+	}
+}
+
+void app_main(void)
+{
+	// Initialize memory
+	esp_err_t ret = nvs_flash_init();
+	if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
+	{
+		ESP_ERROR_CHECK(nvs_flash_erase());
+		ret = nvs_flash_init();
+	}
+	ESP_ERROR_CHECK(ret);
+
+	// Initialize I2C parameters
+	i2c_master_init();
+
+	// Read the data from BME280 sensor
+	xTaskCreate(Publisher_Task, "Publisher_Task", 1024 * 5, NULL, 5, NULL);
+}