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46 lines
1.4 KiB
Markdown
46 lines
1.4 KiB
Markdown
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# BME680 driver test
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## About
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This is a test application for the BME680 driver.
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This driver depends on the Bosch Sensortech
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[BME680 driver](https://github.com/BoschSensortec/BME680_driver).
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## Usage
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This test application will initialize one or more BME680 devices to output
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the following every 5 seconds:
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* Temperature
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* Humidity
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* Pressure
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* Resistance value (depending on VOC gas)
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The driver can use either fixed-point or floating-point arithmetic for all
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conversions. By default fixed-point arithmetic is used. To use floating-point
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arithmetic, the `bme680_fp` module has to be enabled. This can be done in the
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test application by setting the environment variable `ENABLE_FP`:
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```
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ENABLE_FP=1 make BOARD=... -C tests/driver_bme680
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```
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## Interface
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BME680 sensors can be used with I2C and/or SPI. Which interface is used by
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which BME680 sensor is defined in the `bme680_params` parameters. The
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respective implementation is enabled by the modules `bme680_i2c` and
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`bme680_spi`.
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Which implementation is used for the test application is defined by the
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`DRIVER` environment variable. By default `bme680_i2c` is used. To use
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`bme680_spi`, the `DRIVER` variable could be set at the make command line:
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```
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DRIVER=bme680_spi make BOARD=... -C tests/driver_bme680
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```
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It is also possible to use I2C as well SPI simultaneously in the test
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application:
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```
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DRIVER=bme680_spi bme680_i2c' make BOARD=... -C tests/driver_bme680
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```
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