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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>
.. _ht16k33: HT16K33 LED driver with keyscan ############################### Overview ******** This sample controls the LEDs connected to a `Holtek HT16K33`_ driver. The sample supports up to 128 LEDs connected to the rows/columns of the HT16K33. The LEDs are controlled using the following pattern: 1. turn on all connected (up to 128) LEDs one-by-one 2. blink the LEDs at 2 Hz, 1 Hz, and 0.5 Hz 3. reduce the brightness gradually from 100% to 0% 4. turn off all LEDs, restore 100% brightness, and start over The sample logs keyscan events on the console. Building and Running ******************** Build the application for the :ref:`nrf52840dk_nrf52840` board, and connect a HT16K33 LED driver at address 0x70 on the I2C-0 bus. .. zephyr-app-commands:: :zephyr-app: samples/drivers/ht16k33 :board: nrf52840dk_nrf52840 :goals: build :compact: For flashing the application, refer to the Flashing section of the :ref:`nrf52840dk_nrf52840` board documentation. References ********** .. target-notes:: .. _Holtek HT16K33: http://www.holtek.com/productdetail/-/vg/HT16K33