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Andrzej Głąbek 49bd19f3f2 soc: nrf5340: Fix busy waiting on nRF5340 application core
This patch adds a temporary workaround for the incorrect initialization
of the SystemCoreClock global variable that is done for the application
core of nRF5340 (see system_nrf5340_application.c) and that results in
k_busy_wait() producing delays of twice the requested time.
The problem is that the call to SystemCoreClockUpdate() that is done
at the end of SystemInit() correctly sets the value of SystemCoreClock
to reflect the hardware state after reset (HFCLK128M divided by 2),
but then the SystemCoreClock variable is initialized (by z_data_copy()
called from z_arm_prep_c()) to the __SYSTEM_CLOCK value that is defined
as 128000000. This in turn results in nrfx_coredep_delay_us() (used by
k_busy_wait() by default for nRF SoCs) delaying for twice the requested
number of microseconds.
The temporary workaround is to call SystemCoreClockUpdate() at a later
stage of the system initialization, in its nRF53 specific part.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2020-01-03 14:19:38 +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 kconfig: Remove '# hidden' comments on promptless symbols 2020-01-03 11:38:40 +01:00
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 kconfig: Remove '# hidden' comments on promptless symbols 2020-01-03 11:38:40 +01:00
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 kconfig: Remove '# hidden' comments on promptless symbols 2020-01-03 11:38:40 +01:00
lib lib: os: make snprintk fns generally available 2020-01-03 10:13:30 +01:00
misc license: cleanup: add SPDX Apache-2.0 license identifier 2019-04-07 08:45:22 -04:00
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 soc: nrf5340: Fix busy waiting on nRF5340 application core 2020-01-03 14:19:38 +01:00
subsys Bluetooth: controller: split: Pass scanner LLL context in event 2020-01-03 14:16:16 +01:00
tests Bluetooth: shell: Add printing of remote version information 2019-12-23 14:47:31 +02:00
.checkpatch.conf scripts/checkpatch.pl: fix root dir detection and enable it 2019-05-22 12:40:20 -04:00
.clang-format clang-format: add support for clang-format 2018-11-19 09:31:44 -05:00
.codecov.yml ci: add .codecov.yml for codecov.io configuration 2018-01-03 13:12:03 -05:00
.editorconfig editorconfig: Set insert_final_newline true 2019-04-10 14:15:38 +02:00
.gitattributes First commit 2015-04-10 16:44:37 -07:00
.gitignore docs: guide: Add build system information 2019-11-15 14:58:51 -05:00
.gitlint gitlint: match max title length restriction with checkpatch 2019-05-29 14:43:16 -04:00
.mailmap mailmap: add entry for Sean Nyekjaer 2019-11-04 14:33:31 +01:00
.shippable.yml ci: use v0.10.1 docker image 2019-12-18 10:15:45 +01:00
.uncrustify.cfg uncrustify: Add a rule to remove space inside function argument 2018-10-16 09:50:03 -04:00
CMakeLists.txt cmake: Fix CMAKE_BUILD_TYPE and OPTIMIZATION_FLAG match check 2019-12-20 20:26:20 -05:00
CODE_OF_CONDUCT.md coc: move to markdown format 2019-01-24 15:37:15 -05:00
CODEOWNERS CODEOWNERS: Add entry for LoRa support 2019-12-21 12:20:24 +01:00
CONTRIBUTING.rst doc: Fixed a link in CONTRIBUTING.rst 2019-02-28 12:46:04 -08:00
Kconfig kconfig: Clean up header comments and make them consistent 2019-11-04 17:31:27 -05:00
Kconfig.zephyr boards: Kconfig: Enable use of shield conditional Kconfig files 2020-01-02 17:02:41 -05:00
LICENSE add top level Apache 2.0 license file 2016-02-05 20:24:37 -05:00
Makefile doc: add clean target to Makefile 2019-02-05 16:58:14 -05:00
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 cmake: explain BUILD_VERSION and KERNEL_VERSION_* 2019-05-09 11:52:05 +02:00
west.yml west: Add LoRaMac-node module 2019-12-21 12:20:24 +01:00
zephyr-env.cmd scripts: remove west from scripts/ 2019-01-29 10:15:01 +01:00
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