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Gunar Schorcht 2017-09-30 20:47:36 +02:00 committed by GitHub
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examples/bme680/bme680_callback_i2c/bme680_callback_i2c.c
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/**
* Simple example with one sensor connected to I2C bus 0
* using BME680 driver and callback function to get the results.
*
* Harware configuration:
*
* ESP8266 BME680
* GPIO 5 (SCL) -> SCL
* GPIO 4 (SDA) -- SDA
*/
#include "espressif/esp_common.h"
#include "esp/uart.h"
#include "i2c/i2c.h"
// include BME680 driver
#include "bme680/bme680_drv.h"
// define I2C interfaces at which BME680 sensors can be connected
#define I2C_BUS 0
#define I2C_SCL_PIN GPIO_ID_PIN((5))
#define I2C_SDA_PIN GPIO_ID_PIN((4))
#define BME680_ADDR1 0x76
#define BME680_ADDR2 0x77 // default
static uint32_t sensor;
/**
* Everything you need is a callback function that can handle
* callbacks from the background measurement task of the
* BME680 driver. This function is called periodically
* and delivers the actual and average sensor value sets for
* given sensor.
*/
static void my_callback_function (uint32_t sensor,
bme680_value_set_t actual,
bme680_value_set_t average)
{
printf("%.3f Sensor %d: %.2f (%.2f) C, %.2f (%.2f) Percent, %.2f (%.2f) hPa, %.2f (%.2f) Ohm\n",
(double)sdk_system_get_time()*1e-3, sensor,
actual.temperature, average.temperature,
actual.humidity, average.humidity,
actual.pressure, average.pressure,
actual.gas, average.gas);
}
void user_init(void)
{
// Set UART Parameter
uart_set_baud(0, 115200);
// Give the UART some time to settle
sdk_os_delay_us(500);
/** Please note:
* Function *bme680_create_sensor* returns a value greater or equal 0
* on succes, all other *bme680_* functions return true on success. Using
* these return values, you could realize an error handling. Error
* handling is not realized in this example due to readability reasons.
*/
/** -- MANDATORY PART -- */
// Init all I2C bus interfaces at which BME680 sensors are connected
i2c_init(I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
// Init BME680 driver itself.
bme680_init_driver();
// Create the sensor with slave address 0x77 (BME680_ADDR2) connected to
// I2C bus 0 (I2C_BUS_1). Parameter *cs* is ignored in case of I2C.
sensor = bme680_create_sensor (I2C_BUS, BME680_ADDR2, 0);
// Register the callback function to get measurement results.
bme680_set_callback_function (sensor, &my_callback_function);
// That's it.
/** -- OPTIONAL PART -- */
// Change the period of measurements (default 1000 ms) to 500 ms.
bme680_set_measurement_period (sensor, 500);
// Changes the oversampling rates (default os_1x) to 4x oversampling for
// temperature and 2x oversampling for pressure. Humidity measurement is
// skipped.
bme680_set_oversampling_rates(sensor, os_4x, os_2x, none);
// Change the IIR filter size (default iir_size_3) for temperature and
// and pressure to 7.
bme680_set_filter_size(sensor, iir_size_7);
// Change the heaeter profile (default 320 degree Celcius for 150 ms) to
// 200 degree Celcius for 100 ms.
bme680_set_heater_profile (sensor, 200, 100);
}