79e6b0e0f6
As of today <zephyr/zephyr.h> is 100% equivalent to <zephyr/kernel.h>. This patch proposes to then include <zephyr/kernel.h> instead of <zephyr/zephyr.h> since it is more clear that you are including the Kernel APIs and (probably) nothing else. <zephyr/zephyr.h> sounds like a catch-all header that may be confusing. Most applications need to include a bunch of other things to compile, e.g. driver headers or subsystem headers like BT, logging, etc. The idea of a catch-all header in Zephyr is probably not feasible anyway. Reason is that Zephyr is not a library, like it could be for example `libpython`. Zephyr provides many utilities nowadays: a kernel, drivers, subsystems, etc and things will likely grow. A catch-all header would be massive, difficult to keep up-to-date. It is also likely that an application will only build a small subset. Note that subsystem-level headers may use a catch-all approach to make things easier, though. NOTE: This patch is **NOT** removing the header, just removing its usage in-tree. I'd advocate for its deprecation (add a #warning on it), but I understand many people will have concerns. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no> |
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| src | ||
| CMakeLists.txt | ||
| README.rst | ||
| prj.conf | ||
| sample.yaml | ||
README.rst
.. _hello_world_user:
Hello World
###########
Overview
********
A simple Hello World example that can be used with any supported board and
prints 'Hello World from UserSpace!' to the console.
If unavailable or unconfigured then 'Hello World from privileged mode.'
is printed instead.
This application can be built into modes:
* single thread
* multi threading
Building and Running
********************
This project outputs 'Hello World from UserSpace!' to the console.
It can be built and executed on QEMU as follows:
.. zephyr-app-commands::
:zephyr-app: samples/userspace/hello_world_user
:host-os: unix
:board: qemu_riscv32
:goals: run
:compact:
Sample Output
=============
.. code-block:: console
Hello World from UserSpace! qemu_riscv32
Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.