130 lines
4 KiB
C
130 lines
4 KiB
C
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// #include <stdio.h>
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// void app_main(void)
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// {
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// }
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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 "driver/i2c.h"
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#include "bme680.h"
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#define I2C_PORT I2C_NUM_0
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#define I2C_SDA_PIN 0 // GPIO0
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#define I2C_SCL_PIN 2 // GPIO2
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#define I2C_FREQ_HZ 100000
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#define BME680_ADDR BME680_I2C_ADDR_PRIMARY // 0x76 (SDO=GND)
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// #define BME680_ADDR BME680_I2C_ADDR_SECONDARY // 0x77 (SDO=VCC)
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// --- I2C helpers (ESP-IDF style) ---
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static int8_t i2c_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len) {
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (dev_id << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, reg_addr, true);
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (dev_id << 1) | I2C_MASTER_READ, true);
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if (len > 1) {
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i2c_master_read(cmd, data, len - 1, I2C_MASTER_ACK);
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}
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i2c_master_read_byte(cmd, data + len - 1, I2C_MASTER_NACK);
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i2c_master_stop(cmd);
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esp_err_t ret = i2c_master_cmd_begin(I2C_PORT, cmd, pdMS_TO_TICKS(1000));
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i2c_cmd_link_delete(cmd);
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return (ret == ESP_OK) ? BME680_OK : BME680_E_COM_FAIL;
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}
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static int8_t i2c_write(uint8_t dev_id, uint8_t reg_addr, const uint8_t *data, uint16_t len) {
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (dev_id << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, reg_addr, true);
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i2c_master_write(cmd, (uint8_t*)data, len, true);
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i2c_master_stop(cmd);
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esp_err_t ret = i2c_master_cmd_begin(I2C_PORT, cmd, pdMS_TO_TICKS(1000));
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i2c_cmd_link_delete(cmd);
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return (ret == ESP_OK) ? BME680_OK : BME680_E_COM_FAIL;
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}
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static void delay_ms(uint32_t period_ms) { vTaskDelay(pdMS_TO_TICKS(period_ms)); }
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static void i2c_init(void) {
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = I2C_SDA_PIN,
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.scl_io_num = I2C_SCL_PIN,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = I2C_FREQ_HZ,
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};
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i2c_param_config(I2C_PORT, &conf);
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i2c_driver_install(I2C_PORT, conf.mode, 0, 0, 0);
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}
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void app_main(void) {
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i2c_init();
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struct bme680_dev dev = {0};
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dev.dev_id = BME680_ADDR;
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dev.intf = BME680_I2C_INTF;
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dev.read = i2c_read;
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dev.write = i2c_write;
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dev.delay_ms = delay_ms;
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if (bme680_init(&dev) != BME680_OK) {
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printf("BME680 init failed\n");
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return;
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}
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// Oversampling / filter
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dev.tph_sett.os_hum = BME680_OS_2X;
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dev.tph_sett.os_pres = BME680_OS_4X;
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dev.tph_sett.os_temp = BME680_OS_8X;
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dev.tph_sett.filter = BME680_FILTER_SIZE_3;
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// Gas sensor
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dev.gas_sett.run_gas = BME680_ENABLE_GAS_MEAS;
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dev.gas_sett.heatr_temp = 320; // °C
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dev.gas_sett.heatr_dur = 150; // ms
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uint8_t set_required_settings = BME680_OST_SEL | BME680_OSP_SEL |
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BME680_OSH_SEL | BME680_FILTER_SEL |
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BME680_GAS_SENSOR_SEL;
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if (bme680_set_sensor_settings(set_required_settings, &dev) != BME680_OK) {
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printf("Sensor settings failed\n");
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return;
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}
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while (1) {
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// Force mode, one-shot
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if (bme680_set_sensor_mode(&dev) != BME680_OK) {
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printf("Set mode failed\n");
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vTaskDelay(pdMS_TO_TICKS(1000));
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continue;
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}
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// Wait for measurement time
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uint16_t meas_period;
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bme680_get_profile_dur(&meas_period, &dev);
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vTaskDelay(pdMS_TO_TICKS(meas_period));
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struct bme680_field_data data;
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if (bme680_get_sensor_data(&data, &dev) == BME680_OK) {
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printf("T=%.2f °C RH=%.2f %% P=%.2f hPa Gas=%.2f kΩ\n",
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data.temperature / 100.0f,
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data.humidity / 1000.0f,
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data.pressure / 100.0f,
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data.gas_resistance / 1000.0f);
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} else {
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printf("Read failed\n");
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}
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vTaskDelay(pdMS_TO_TICKS(2000));
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}
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}
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