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Stephanos Ioannidis fc941d583e drivers: timer: xlnx_psttc_timer: Implement tickless support
This commit reworks the Xilinx TTC timer driver to use the "match" mode
instead of the "interval" mode which counts up to the specified value
and resets to zero.

Using the "match" mode ensures that the timer keeps counting even after
an interrupt is triggered, and facilitates the tickless mode support
implementation.

This also allows `z_timer_cycle_get_32` to return the correct cycle
count when interrupt is locked; thereby, fixing the k_busy_wait hang
issue.

Note that the TTC "match" mode emulation (and tickless timer operation)
is only stable when the QEMU icount mode is enabled.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
2020-03-21 14:20:17 -04:00
.github ci: support license check with topic branch with v3 2020-02-20 18:22:58 -06:00
.known-issues docs: crypto: crypto API documentation 2020-03-14 13:01:03 -04:00
arch arch: aarch64: Rework exception entry/exit code 2020-03-20 14:15:43 +01:00
boards drivers: timer: xlnx_psttc_timer: Implement tickless support 2020-03-21 14:20:17 -04:00
cmake cmake: Allow projects to add additional dependencies to flash target 2020-03-20 10:52:32 +01:00
doc doc: reference: kernel: remove inconsistent comment for k_cpu_idle 2020-03-20 11:53:14 +01:00
drivers drivers: timer: xlnx_psttc_timer: Implement tickless support 2020-03-21 14:20:17 -04:00
dts dts: bindings: Fix xlnx,ttcps binding compat 2020-03-21 14:20:17 -04:00
ext ext: debug: Move ctf_map.h to subsys/tracing/ctf 2020-03-20 22:56:19 -04:00
include kernel: cpu idle: add info about IRQ unlocking in k_cpu_idle 2020-03-20 11:53:14 +01:00
kernel Revert "global: Replace BUILD_ASSERT_MSG() with BUILD_ASSERT()" 2020-03-19 18:45:13 +01:00
lib ext: lib: Move fnmatch to lib/ 2020-03-20 22:56:19 -04:00
misc license: cleanup: add SPDX Apache-2.0 license identifier 2019-04-07 08:45:22 -04:00
modules ext: crypto: Remove TinyCrypt from the tree and use a module 2020-03-20 17:29:48 +01:00
samples Bluetooth: Mesh: Slab based segmentation handling 2020-03-19 15:54:26 +02:00
scripts scripts/requirements: Split & document requirement.txt 2020-03-19 15:41:08 +01:00
soc soc: silabs_exx32: Add support for SiLabs EFR32BG13P SoC 2020-03-20 14:40:42 -05:00
subsys ext: debug: Move ctf_map.h to subsys/tracing/ctf 2020-03-20 22:56:19 -04:00
tests dts: bindings: Fix xlnx,ttcps binding compat 2020-03-21 14:20:17 -04:00
.checkpatch.conf checkpatch: suppress mailback option in conf file 2020-02-06 08:31:53 -05:00
.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: Add assembly code file spec 2020-03-18 12:27:04 -04:00
.gitattributes First commit 2015-04-10 16:44:37 -07:00
.gitignore gitignore: exclude tests/drivers/build_all 2020-03-20 13:49:05 -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: Bump to SDK 0.11.2 and CI image 0.11.4 2020-02-14 20:54:33 +02:00
.uncrustify.cfg uncrustify: Add a rule to remove space inside function argument 2018-10-16 09:50:03 -04:00
CMakeLists.txt ext: debug: Move ctf_map.h to subsys/tracing/ctf 2020-03-20 22:56:19 -04:00
CODE_OF_CONDUCT.md coc: move to markdown format 2019-01-24 15:37:15 -05:00
CODEOWNERS drivers: timer: xlnx_psttc_timer: Implement tickless support 2020-03-21 14:20:17 -04:00
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 ext: lib: Move fnmatch to lib/ 2020-03-20 22:56:19 -04:00
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 doc: fix broken links in README and board docs 2020-03-12 17:18:49 -04:00
VERSION release: post release patch level = 99 2020-03-10 11:57:47 +02:00
version.h.in cmake: explain BUILD_VERSION and KERNEL_VERSION_* 2019-05-09 11:52:05 +02:00
west.yml soc: silabs_exx32: Add support for SiLabs EFR32BG13P SoC 2020-03-20 14:40:42 -05:00
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://github.com/zephyrproject-rtos/zephyr/releases
* **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