zephyr

History

Keith Packard 0b90fd5adf samples, tests, boards: Switch main return type from void to int As both C and C++ standards require applications running under an OS to return 'int', adapt that for Zephyr to align with those standard. This also eliminates errors when building with clang when not using -ffreestanding, and reduces the need for compiler flags to silence warnings for both clang and gcc. Most of these changes were automated using coccinelle with the following script: @@ @@ - void + int main(...) { ... - return; + return 0; ... } Approximately 40 files had to be edited by hand as coccinelle was unable to fix them. Signed-off-by: Keith Packard <keithp@keithp.com>		2023-04-14 07:49:41 +09:00
..
boards
src	samples, tests, boards: Switch main return type from void to int	2023-04-14 07:49:41 +09:00
CMakeLists.txt
prj.conf
README.rst
sample.yaml

README.rst

.. _bme680:

BME680: Integrated environmental sensor
#####################################################

Description
***********

This sample application periodically (every 3s) measures the ambient temperature
in degrees Celsius, atmospheric pressure in kilopascal, relative humidity in percentage,
and gas sensor resistance in ohms. The result is written to the console.

References
**********

 - BME680: https://www.bosch-sensortec.com/bst/products/all_products/bme680

Wiring
*******

This sample uses the BME680 sensor controlled using the I2C interface.
Connect Supply: **VDD**, **VDDIO**, **GND** and Interface: **SDA**, **SCL**.
The supply voltage can be in the 1.8V to 3.6V range.
Depending on the baseboard used, the **SDA** and **SCL** lines require Pull-Up
resistors.

Building and Running
********************

This project outputs sensor data to the console. It requires a BME680
sensor. It should work with any platform featuring a I2C peripheral interface.
It does not work on QEMU.
In this example below the :ref:`nrf52840dk_nrf52840` board is used.


.. zephyr-app-commands::
   :zephyr-app: samples/sensor/bme680
   :board: nrf52840dk_nrf52840
   :goals: build flash

Sample Output
=============

.. code-block:: console

   Device 0x20002b74 name is BME680
   T: 23.988877; P: 97.648568; H: 53.689533; G: 1035.211466
   T: 24.168500; P: 97.648866; H: 53.565966; G: 1046.677896
   T: 24.336533; P: 97.648596; H: 53.353663; G: 1058.656533
   T: 24.589696; P: 97.648366; H: 53.958864; G: 1072.155863
   T: 24.856631; P: 97.648322; H: 53.553669; G: 1096.448788

   <repeats endlessly>