The test application demonstrates the use of the CCS811. It uses the default configuration parameters, that is, the measurement mode CCS811_MODE_1S with one measurement per second.

The application can use both approaches to wait for new data:

using the data-ready interrupt (CCS811_INT_DATA_READY):
```
#define USE_CSS811_DATA_READY_INT  (1)
```
using the data-ready status function (ccs811_data_ready)
```
#define USE_CSS811_DATA_READY_INT  (0)
```

If data-ready interrupts are used, the default configuration parameter for the interrupt pin can be overriden by CCS811_PARAM_INT_PIN before ccs811_params.h is included.

#define CCS811_PARAM_INT_PIN     (GPIO_PIN(0, 12))