CCS811 driver added (#479)
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examples/ccs811/ccs811_one_sensor
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examples/ccs811/ccs811_one_sensor/Makefile
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examples/ccs811/ccs811_one_sensor/Makefile
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PROGRAM=CCS811_One_Sensor
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EXTRA_COMPONENTS = extras/i2c extras/ccs811
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include ../../../common.mk
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examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c
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examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c
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/**
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* Simple example with one sensor connected to I2C bus 0. It demonstrates the
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* different approaches to fetch the data. Either the interrupt *nINT* is used
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* whenever new data are available or exceed defined thresholds or the new
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* data are fetched periodically.
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*
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* Harware configuration:
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*
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* +------------------------+ +--------+
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* | ESP8266 Bus 0 | | CCS811 |
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* | GPIO 5 (SCL) >----> SCL |
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* | GPIO 4 (SDA) ------ SDA |
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* | GPIO 2 <----- /nINT |
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* | GND -----> /WAKE |
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* +------------------------+ +--------+
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*/
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// use following constants to define the demo mode
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// #define INT_DATA_RDY_USED
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// #define INT_THRESHOLD_USED
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#include "espressif/esp_common.h"
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#include "esp/uart.h"
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#include "i2c/i2c.h"
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#include "FreeRTOS.h"
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#include <task.h>
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// include CCS811 driver
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#include "ccs811/ccs811.h"
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// define I2C interfaces at which CCS811 sensors can be connected
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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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// define GPIO for interrupt
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#define INT_GPIO 2
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static ccs811_sensor_t* sensor;
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#if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
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/**
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* In this example, the interrupt *nINT* is used. It is triggered every time
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* new data are available (INT_DATA_RDY_USED) or exceed defined thresholds
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* (INT_THRESHOLD_USED). In this case, the user has to define an interrupt
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* handler that fetches the data directly or triggers a task, that is waiting
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* to fetch the data. In this example, a task is defined which suspends itself
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* in each cycle to wait for fetching the data. The task is resumed by the
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* the interrupt handler.
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*/
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TaskHandle_t nINT_task;
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// User task that fetches the sensor values.
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void user_task_interrupt (void *pvParameters)
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{
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uint16_t tvoc;
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uint16_t eco2;
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while (1)
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{
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// task suspends itself and waits to be resumed by interrupt handler
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vTaskSuspend (NULL);
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// after resume get the results and do something with them
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if (ccs811_get_results (sensor, &tvoc, &eco2, 0, 0))
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printf("%.3f CCS811 Sensor interrupt: TVOC %d ppb, eCO2 %d ppm\n",
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(double)sdk_system_get_time()*1e-3, tvoc, eco2);
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}
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}
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// Interrupt handler which resumes user_task_interrupt on interrupt
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void nINT_handler (uint8_t gpio)
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{
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xTaskResumeFromISR (nINT_task);
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}
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#else
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/*
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* In this example, user task fetches the sensor values every seconds.
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*/
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void user_task_periodic(void *pvParameters)
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{
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uint16_t tvoc;
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uint16_t eco2;
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TickType_t last_wakeup = xTaskGetTickCount();
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while (1)
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{
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// get environmental data from another sensor and set them
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// ccs811_set_environmental_data (sensor, 25.3, 47.8);
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// get the results and do something with them
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if (ccs811_get_results (sensor, &tvoc, &eco2, 0, 0))
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printf("%.3f CCS811 Sensor periodic: TVOC %d ppb, eCO2 %d ppm\n",
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(double)sdk_system_get_time()*1e-3, tvoc, eco2);
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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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#endif
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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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// init all I2C bus interfaces at which CCS811 sensors are connected
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i2c_init (I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
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// longer clock stretching is required for CCS811
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i2c_set_clock_stretch (I2C_BUS, CCS811_I2C_CLOCK_STRETCH);
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// init the sensor with slave address CCS811_I2C_ADDRESS_1 connected I2C_BUS.
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sensor = ccs811_init_sensor (I2C_BUS, CCS811_I2C_ADDRESS_1);
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if (sensor)
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{
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#if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
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// create a task that is resumed by interrupt handler to use the sensor
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xTaskCreate(user_task_interrupt, "user_task_interrupt", 256, NULL, 2, &nINT_task);
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// activate the interrupt for INT_GPIO and set the interrupt handler
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gpio_set_interrupt(INT_GPIO, GPIO_INTTYPE_EDGE_NEG, nINT_handler);
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#ifdef INT_DATA_RDY_USED
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// enable the data ready interrupt
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ccs811_enable_interrupt (sensor, true);
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#else
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// set threshold parameters and enable threshold interrupt mode
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ccs811_set_eco2_thresholds (sensor, 600, 1100, 40);
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#endif
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#else
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// create a periodic task that uses the sensor
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xTaskCreate(user_task_periodic, "user_task_periodic", 256, NULL, 2, NULL);
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#endif
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// start periodic measurement with one measurement per second
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ccs811_set_mode (sensor, ccs811_mode_1s);
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}
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}
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