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0b90fd5adf
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>
.. _mhz19b-sample: MH-Z19B: CO2 Sensor Sample ########################## Description *********** This sample application demonstrate the configurations of the MH-Z19B CO2 sensor, then periodically reads CO2 data from the sensor. The driver currently only support uart interrupt APIs. Requirements ************ The baudrate of the UART must be configured to 9600, and must support interrupt driven API. Building and Running ******************** To build the application, a board with UART interface has to be chosen, or a custom devicetree overlay has to be provided. Here Nucleo G0B1RE board is used. Then, connect the RX and TX from your Zephyr target board to the MH-Z19B CO2 sensor and power the sensor according to the datasheet. .. zephyr-app-commands:: :zephyr-app: samples/sensor/mhz19b :board: nucleo_g0b1re :goals: build :compact: Sample Output ============= The application will perform runtime configuration of the sensor, then read back the sensor configuration data. After that it will read the CO2 data every 2 seconds. .. code-block:: console Winsen MH-Z19B CO2 sensor application Configuring sensor - OK Reading configurations from sensor: Sensor range is set to 5000ppm Sensor ABC is enabled sensor: co2 reading: 758 sensor: co2 reading: 759 sensor: co2 reading: 762 <repeats endlessly every 2 seconds>