125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
/**
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* Simple example with one sensor connected to I2C bus 0 and a sequence of
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* heating profiles. The heating profile is changed with each cycle.
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*
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* Harware configuration:
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*
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* I2C +-------------------------+ +----------+
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* | ESP8266 Bus 0 | | BME680 |
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* | GPIO 5 (SCL) ------> SCL |
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* | GPIO 4 (SDA) ------- SDA |
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* +-------------------------+ +----------+
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*/
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#include "espressif/esp_common.h"
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#include "esp/uart.h"
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#include "FreeRTOS.h"
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#include "task.h"
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// include communication interface driver
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#include "i2c/i2c.h"
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// include BME680 driver
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#include "bme680/bme680.h"
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// define I2C interface for BME680 sensors
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#define I2C_BUS 0
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#define I2C_SCL_PIN 5
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#define I2C_SDA_PIN 4
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static bme680_sensor_t* sensor;
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/*
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* User task that triggers measurements of sensor every seconds. It uses
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* function *vTaskDelay* to wait for measurement results and changes the
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* heating profile in each cycle.
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*/
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void user_task(void *pvParameters)
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{
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bme680_values_float_t values;
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TickType_t last_wakeup = xTaskGetTickCount();
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uint32_t count = 0;
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while (1)
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{
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if (count++ < 60)
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// disable gas measurement for cycle counter < 60
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bme680_use_heater_profile (sensor, BME680_HEATER_NOT_USED);
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else
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// change heating profile in each cycle
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switch (count % 5)
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{
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case 0: bme680_use_heater_profile (sensor, 0); break;
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case 1: bme680_use_heater_profile (sensor, 1); break;
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case 2: bme680_use_heater_profile (sensor, 2); break;
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case 3: bme680_use_heater_profile (sensor, 3); break;
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case 4: bme680_use_heater_profile (sensor, 4); break;
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}
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// measurement duration changes in each cycle
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uint32_t duration = bme680_get_measurement_duration(sensor);
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// trigger the sensor to start one TPHG measurement cycle
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if (bme680_force_measurement (sensor))
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{
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// passive waiting until measurement results are available
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vTaskDelay (duration);
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// get the results and do something with them
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if (bme680_get_results_float (sensor, &values))
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printf("%.3f BME680 Sensor: %.2f °C, %.2f %%, %.2f hPa, %.2f Ohm\n",
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(double)sdk_system_get_time()*1e-3,
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values.temperature, values.humidity,
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values.pressure, values.gas_resistance);
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}
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// passive waiting until 1 second is over
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vTaskDelayUntil(&last_wakeup, 1000 / portTICK_PERIOD_MS);
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}
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}
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void user_init(void)
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{
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// Set UART Parameter
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uart_set_baud(0, 115200);
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// Give the UART some time to settle
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sdk_os_delay_us(500);
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/** -- MANDATORY PART -- */
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#ifdef SPI_USED
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// Init the sensor connected either to SPI.
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sensor = bme680_init_sensor (SPI_BUS, 0, SPI_CS_GPIO);
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#else
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// Init all I2C bus interfaces at which BME680 sensors are connected
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i2c_init(I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
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// Init the sensor connected either to I2C.
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sensor = bme680_init_sensor (I2C_BUS, BME680_I2C_ADDRESS_2, 0);
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#endif
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if (sensor)
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{
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// Create a task that uses the sensor
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xTaskCreate(user_task, "user_task", 256, NULL, 2, NULL);
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/** -- OPTIONAL PART -- */
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// Changes the oversampling rates to 4x oversampling for temperature
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// and 2x oversampling for humidity. Pressure measurement is skipped.
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bme680_set_oversampling_rates(sensor, osr_4x, osr_none, osr_2x);
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// Change the IIR filter size for temperature and pressure to 7.
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bme680_set_filter_size(sensor, iir_size_7);
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// Define a number of different heating profiles
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bme680_set_heater_profile (sensor, 0, 200, 100);
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bme680_set_heater_profile (sensor, 1, 250, 120);
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bme680_set_heater_profile (sensor, 2, 300, 140);
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bme680_set_heater_profile (sensor, 3, 350, 160);
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bme680_set_heater_profile (sensor, 4, 400, 180);
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}
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}
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