zephyr

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Andrzej Głąbek b4fb5300da boards: nrf52840dk_nrf52840: Do not enable arduino_serial by default This is a follow-up to commit `25d7a09aa5`. The arduino_serial/uart1 node should not be enabled by default because even if an application does not use it, the default CONFIG_SERIAL=y setting causes that it is anyway initialized, so the UARTE peripheral acquires its assigned pins (and they cannot be used in other way) and its enabled receiver causes increased current consumption (by ~500 uA) when the CPU is sleeping. This affects e.g. the boards/nrf/system_off sample. Applications that actually need to use this UART or shields that use the arduino_serial node should enable the node explicitly. Keep this node disabled by default for the nrf52840dk_nrf52840 board and also for boards whose definitions are mostly copies of the above: nrf52833dk_nrf52833 and nrf21540dk_nrf52840. Update also accordingly a few overlay files in tests/ that were disabling this node because of the pins it undesirably acquired. Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>		2023-01-16 09:26:10 +01:00
..
boards	boards: nrf52840dk_nrf52840: Do not enable arduino_serial by default	2023-01-16 09:26:10 +01:00
dts/bindings	yamllint: indentation: fix files in tests/	2023-01-04 14:23:53 +01:00
src
CMakeLists.txt
prj.conf
README.txt
testcase.yaml	yamllint: indentation: fix files in tests/	2023-01-04 14:23:53 +01:00

README.txt

GPIO 2-Pin Test
###############

This application tests the GPIO subsystem using a hardware configuration
where two GPIOs are directly wired together.  The test pins are
identified through a test-specific devicetree binding in the `dts/`
subdirectory, implemented for specific boards by overlay files in the
`boards/` directory.

For some boards `src/main.c` may also need to be extended to configure
the selected pins for use as GPIOs.

Only boards for which an overlay is present can pass this test.  Boards
without an overlay, or for which the required wiring is not provided,
will fail with an error like this:

    Validate device GPIO_0
    Check GPIO_0 output 2 connected to input 3
    FATAL output pin not wired to input pin? (out high => in low)

No special build options are required to make use of the overlay.