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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>
.. _dht: DHT: Aosong DHT Digital-output Humidity and Temperature Sensor ############################################################## Description *********** This sample application periodically (0.5 Hz) measures the ambient temperature and humidity. The result is written to the console. Wiring ******* This sample uses an external breakout for the sensor. A devicetree overlay must be provided to identify the sensor variant and the 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/dht :board: nrf52dk_nrf52832 :goals: build flash Sample Output ============= .. code-block:: console *** Booting Zephyr OS build zephyr-v2.1.0-329-g38418b26c4cc *** [0:00:00.027]: 20.0 Cel ; 48.7 %RH [0:00:02.053]: 19.8 Cel ; 48.7 %RH [0:00:04.079]: 20.0 Cel ; 48.7 %RH [0:00:06.105]: 19.8 Cel ; 48.7 %RH [0:00:08.130]: 20.0 Cel ; 48.8 %RH [0:00:10.156]: 20.1 Cel ; 48.8 %RH [0:00:12.182]: 19.7 Cel ; 48.7 %RH [0:00:14.207]: 20.0 Cel ; 48.8 %RH <repeats endlessly>