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	…
README.rst	…
prj.conf	…
sample.yaml	…

README.rst

.. _mpu6050:

MPU6050: Invensense Motion Tracking Device
##########################################

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

This sample application periodically (0.5 Hz) measures the sensor
temperature, acceleration, and angular velocity, displaying the values
on the console along with a timestamp since startup.

When triggered mode is enabled the measurements are displayed at the
rate they are produced by the sensor.

Wiring
*******

This sample uses an external breakout for the sensor.  A devicetree
overlay must be provided to identify the I2C bus and GPIO used to
control the sensor.

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

After providing a devicetree overlay that specifies the sensor location,
build this sample app using:

.. zephyr-app-commands::
   :zephyr-app: samples/sensor/mpu6050
   :board: nrf52dk_nrf52832
   :goals: build flash

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

.. code-block:: console

   *** Booting Zephyr OS build zephyr-v2.1.0-576-g4b38659b0661  ***
   [0:00:00.008]:23.6359 Cel
     accel -5.882554 -6.485893  5.868188 m/s/s
     gyro   0.014522  0.002264 -0.036905 rad/s
   [0:00:02.020]:23.6359 Cel
     accel -5.841853 -6.435615  5.911283 m/s/s
     gyro   0.017852  0.001199 -0.034640 rad/s
   [0:00:04.032]:23.6829 Cel
     accel -5.930438 -6.461951  6.009446 m/s/s
     gyro   0.012923  0.002131 -0.037171 rad/s
   [0:00:06.044]:23.6359 Cel
     accel -5.884948 -6.524200  5.961562 m/s/s
     gyro   0.012390 -0.001732 -0.045964 rad/s
   [0:00:08.056]:35.7712 Cel
     accel -5.863400 -12.872426 -0.154427 m/s/s
     gyro  -0.034373 -0.034373 -0.034373 rad/s
   [0:00:10.068]:23.6829 Cel
     accel -5.906496 -6.461951  5.899312 m/s/s
     gyro   0.015321 -0.000399 -0.039169 rad/s

<repeats endlessly>