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Andrew Boie d76ae46c0c lib: os: make snprintk fns generally available
The intention of disabling CONFIG_PRINTK is that all
invocations of it will compile to nothing, saving a lot
of runtime overhead and footprint since all the format
strings are completely dropped; instances of printk()
and related functions are no-ops.

However, some subsystems need snprintk() for string
processing, since the snprintf() implementations in even
minimal C library are too costly in text footprint or
stack usage for some applications. This processing is
required for the application to even function.

This patch continues to have disabling  CONFIG_PRINTK to
cause the non snprintk functions to become no-ops, but
now we always compile the necessary bits for snprintk(),
relying on gc-sections to discard them if unused.

z_vprintk() is now unconditionally defined in the header
since it is not tied to any particular output sink and
is intended for users who know exactly what they are
doing (it's in zephyr private scope).

Relates to: #21564

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2020-01-03 10:13:30 +01:00
.github/ISSUE_TEMPLATE Revert "github: Add plumbing of using the github workflow labeler" 2019-11-06 19:46:32 +01:00
.known-issues doc: add .known-issue regex for struct bt_mesh_model_pub warnings 2019-12-12 12:39:35 -06:00
arch arch: arm: Enable CMSIS-Core for Cortex-R by default 2020-01-02 16:59:04 -05:00
boards boards/shields: adafruit_2_8_tft_touch_v2: Move to Kconfig.defconfig 2020-01-02 17:02:41 -05:00
cmake cmake: make shield list available to Kconfig 2020-01-02 17:02:41 -05:00
doc doc: document python build scripts 2020-01-02 17:09:29 -05:00
drivers drivers: display_st7789v: remove obsolete display_st7789v_tl019fqv01.c 2020-01-02 17:00:06 -05:00
dts drivers: display_st7789v: obtain panel settings and parameters from DT 2020-01-02 17:00:06 -05:00
ext global: Remove leading/trailing blank lines in files 2019-12-11 19:17:27 +01:00
include lib: os: make snprintk fns generally available 2020-01-03 10:13:30 +01:00
kernel kernel: use 'thread' for thread variable consistently 2019-12-21 19:57:57 -05:00
lib lib: os: make snprintk fns generally available 2020-01-03 10:13:30 +01:00
misc
modules kconfig: Remove some redundant single-item menus and ifs 2019-12-21 10:26:54 -05:00
samples boards/shields: ssd1306: Factorize and move to conditional Kconfig 2020-01-02 17:02:41 -05:00
scripts doc: document python build scripts 2020-01-02 17:09:29 -05:00
soc timer: sam0_rtc_timer: Add support for SAME54 2019-12-21 11:15:52 -05:00
subsys Bluetooth: mesh: Add comment explaining use of byte order 2020-01-02 19:05:27 +01:00
tests Bluetooth: shell: Add printing of remote version information 2019-12-23 14:47:31 +02:00
.checkpatch.conf
.clang-format
.codecov.yml
.editorconfig
.gitattributes
.gitignore docs: guide: Add build system information 2019-11-15 14:58:51 -05:00
.gitlint
.mailmap
.shippable.yml ci: use v0.10.1 docker image 2019-12-18 10:15:45 +01:00
.uncrustify.cfg
CMakeLists.txt cmake: Fix CMAKE_BUILD_TYPE and OPTIMIZATION_FLAG match check 2019-12-20 20:26:20 -05:00
CODE_OF_CONDUCT.md
CODEOWNERS CODEOWNERS: Add entry for LoRa support 2019-12-21 12:20:24 +01:00
CONTRIBUTING.rst
Kconfig
Kconfig.zephyr boards: Kconfig: Enable use of shield conditional Kconfig files 2020-01-02 17:02:41 -05:00
LICENSE
Makefile
README.rst global: Remove leading/trailing blank lines in files 2019-12-11 19:17:27 +01:00
VERSION release: post release patch level = 99 2019-12-09 21:53:34 -05:00
version.h.in
west.yml west: Add LoRaMac-node module 2019-12-21 12:20:24 +01:00
zephyr-env.cmd
zephyr-env.sh zephyr_env.sh: Remove semicolons at ends of lines 2019-12-10 14:34:46 -08:00

.. raw:: html

   <a href="https://www.zephyrproject.org">
     <p align="center">
       <img src="doc/images/Zephyr-Project.png">
     </p>
   </a>

   <a href="https://bestpractices.coreinfrastructure.org/projects/74"><img
   src="https://bestpractices.coreinfrastructure.org/projects/74/badge"></a>
   <img
   src="https://api.shippable.com/projects/58ffb2b8baa5e307002e1d79/badge?branch=master">


The Zephyr Project is a scalable real-time operating system (RTOS) supporting
multiple hardware architectures, optimized for resource constrained devices,
and built with security in mind.

The Zephyr OS is based on a small-footprint kernel designed for use on
resource-constrained systems: from simple embedded environmental sensors and
LED wearables to sophisticated smart watches and IoT wireless gateways.

The Zephyr kernel supports multiple architectures, including ARM Cortex-M,
Intel x86, ARC, Nios II, Tensilica Xtensa, and RISC-V, and a large number of
`supported boards`_.

.. below included in doc/introduction/introduction.rst

.. start_include_here

Getting Started
***************

Welcome to Zephyr! See the `Introduction to Zephyr`_ for a high-level overview,
and the documentation's `Getting Started Guide`_ to start developing.

Community Support
*****************

Community support is provided via mailing lists and Slack; see the Resources
below for details.

.. _project-resources:

Resources
*********

Here's a quick summary of resources to help you find your way around:

* **Help**: `Asking for Help Tips`_
* **Documentation**: http://docs.zephyrproject.org (`Getting Started Guide`_)
* **Source Code**: https://github.com/zephyrproject-rtos/zephyr is the main
  repository; https://elixir.bootlin.com/zephyr/latest/source contains a
  searchable index
* **Releases**: https://zephyrproject.org/developers/#downloads
* **Samples and example code**: see `Sample and Demo Code Examples`_
* **Mailing Lists**: users@lists.zephyrproject.org and
  devel@lists.zephyrproject.org are the main user and developer mailing lists,
  respectively. You can join the developer's list and search its archives at
  `Zephyr Development mailing list`_. The other `Zephyr mailing list
  subgroups`_ have their own archives and sign-up pages.
* **Nightly CI Build Status**: https://lists.zephyrproject.org/g/builds
  The builds@lists.zephyrproject.org mailing list archives the CI
  (shippable) nightly build results.
* **Chat**: Zephyr's Slack workspace is https://zephyrproject.slack.com.  Use
  this `Slack Invite`_ to register.
* **Contributing**: see the `Contribution Guide`_
* **Wiki**: `Zephyr GitHub wiki`_
* **Issues**: https://github.com/zephyrproject-rtos/zephyr/issues
* **Security Issues**: Email vulnerabilities@zephyrproject.org to report
  security issues; also see our `Security`_ documentation. Security issues are
  tracked separately at https://zephyrprojectsec.atlassian.net.
* **Zephyr Project Website**: https://zephyrproject.org

.. _Slack Invite: https://tinyurl.com/y5glwylp
.. _supported boards: http://docs.zephyrproject.org/latest/boards/index.html
.. _Zephyr Documentation: http://docs.zephyrproject.org
.. _Introduction to Zephyr: http://docs.zephyrproject.org/latest/introduction/index.html
.. _Getting Started Guide: http://docs.zephyrproject.org/latest/getting_started/index.html
.. _Contribution Guide: http://docs.zephyrproject.org/latest/contribute/index.html
.. _Zephyr GitHub wiki: https://github.com/zephyrproject-rtos/zephyr/wiki
.. _Zephyr Development mailing list: https://lists.zephyrproject.org/g/devel
.. _Zephyr mailing list subgroups: https://lists.zephyrproject.org/g/main/subgroups
.. _Sample and Demo Code Examples: http://docs.zephyrproject.org/latest/samples/index.html
.. _Security: http://docs.zephyrproject.org/latest/security/index.html
.. _Asking for Help Tips: https://docs.zephyrproject.org/latest/guides/getting-help.html