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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>
MAX6675 K-thermocouple to digital converter ########################################### Overview ******** This is a sample application to read an external MAX6675 cold-junction-compensated K-thermocouple to digital converter. Requirements ************ - MAX6675 wired to your board SPI bus - K-thermocouple connected to MAX6675 T+/T- inputs References ********** - MAX6675: https://datasheets.maximintegrated.com/en/ds/MAX6675.pdf Building and Running ******************** This sample can be built with any board that supports SPI. A sample overlay is provided for the NUCLEO-F030R8 board. .. zephyr-app-commands:: :zephyr-app: samples/sensor/max6675 :board: nucleo_f030r8 :goals: build :compact: Sample Output ============= The application will read and print sensor temperature every second. Note that temperature fetch will fail if the K-thermocouple is not connected. This is because MAX6675 is able to detect if the K-thermocouple is connected or not. .. code-block:: console Temperature: 25.25 C Temperature: 25.50 C <repeats endlessly every second>