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Johann Fischer 37f4d9ba63 usb: cdc_acm: rework cdc_acm_poll_out to non-blocking
Change cdc_acm_poll_out to do the best to mimic behavior
of a hardware UART controller without flow control.

With this patch, if the USB subsystem is not ready,
no data is transfered to the buffer, that is, new character
is dropped. If the USB subsystem is ready and the buffer is full,
the first character from the tx_ringbuf is removed to
make room for the new character.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
2021-08-12 16:57:12 -04:00
.buildkite ci: Bump to use SDK 0.13.0 2021-08-03 22:57:41 -04:00
.github doc-build.yml: build west 0.11.1a1 2021-08-09 13:29:57 -04:00
arch ARC: MWDT: fix SMP build for MWDT toolchain 2021-08-10 07:36:25 -04:00
boards boards: mimxrt1060_evk: Enable lpuart3's flow control pin mux 2021-08-12 14:49:09 -05:00
cmake cmake: dts: removing generated <board>.dts_compiled 2021-08-11 11:16:18 -04:00
doc Bluetooth: gatt: Add option to read multiple without variable length 2021-08-12 11:07:08 -04:00
drivers drivers: serial: NXP: Enable flow control for uart_mcux_lpuart 2021-08-12 14:49:09 -05:00
dts dts: arm: st: rename g0 tim1 interrupt to align with f0 series 2021-08-12 07:06:14 -05:00
include Bluetooth: gatt: Add option to read multiple without variable length 2021-08-12 11:07:08 -04:00
kernel pm: device: Add wakeup source API 2021-08-11 19:39:13 -04:00
lib lib: newlib: Add retargetable locking implementation 2021-08-09 08:51:24 -05:00
misc toolchain: add GEN_ABSOLUTE_SYM_KCONFIG() 2021-02-02 09:23:45 -05:00
modules modules: hal_nxp: tweak integration to utilize cmake-ext/kconfig-ext 2021-08-11 12:26:28 -05:00
samples doc: guides: Add a TF-M guide 2021-08-12 10:03:57 -05:00
scripts cmake: add a comment header to zephyr_settings.txt 2021-08-10 07:37:19 -04:00
share cmake: check zephyr version if specified and ZEPHYR_BASE is set 2021-05-25 16:48:35 -05:00
soc drivers: can: Fix isotp test failed on rt1170 EVK 2021-08-12 09:00:30 -05:00
subsys usb: cdc_acm: rework cdc_acm_poll_out to non-blocking 2021-08-12 16:57:12 -04:00
tests Bluetooth: gatt: Add option to read multiple without variable length 2021-08-12 11:07:08 -04:00
.checkpatch.conf checkpatch: ignore linux specific ENOSYS warning 2021-03-30 10:50:14 -05:00
.clang-format clang-format: Change lines length limit from 80 to 100 2021-05-06 08:13:32 -05:00
.codecov.yml ci: add .codecov.yml for codecov.io configuration 2018-01-03 13:12:03 -05:00
.editorconfig editorconfig: indent Kconfig files with tabs 2020-07-08 21:30:38 -04:00
.gitattributes gitattributes: Tell linguist to ignore test pattern files 2020-04-23 14:07:57 -04:00
.gitignore gitignore: add common Python venv directories 2021-04-20 11:30:40 -05:00
.gitlint gitlint: match max title length restriction with checkpatch 2019-05-29 14:43:16 -04:00
.mailmap mailmap: update mailmap file with some stray emails 2021-06-17 14:15:41 -04:00
.uncrustify.cfg uncrustify: Add a rule to remove space inside function argument 2018-10-16 09:50:03 -04:00
CMakeLists.txt kernel: fix kobj table if having .sdata section. 2021-07-22 07:29:21 -05:00
CODE_OF_CONDUCT.md coc: move to markdown format 2019-01-24 15:37:15 -05:00
CODEOWNERS esp32s2: drivers: serial: add minimal uart driver 2021-08-09 13:03:14 -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 soc: esp32s2: add initial soc support files for esp32s2 2021-07-28 21:09:27 -04:00
LICENSE add top level Apache 2.0 license file 2016-02-05 20:24:37 -05:00
MAINTAINERS.yml MAINTAINERS: Add 'Nuvoton_Numicro Platform' for Nuvoton Numicro family. 2021-08-07 20:37:24 -04:00
README.rst readme: add missing logo 2021-07-21 10:37:37 -05:00
VERSION version: add EXTRAVERSION to VERSION file 2021-06-05 07:07:01 -04:00
version.h.in cmake: explain BUILD_VERSION and KERNEL_VERSION_* 2019-05-09 11:52:05 +02:00
west.yml modules: hal_nxp: tweak integration to utilize cmake-ext/kconfig-ext 2021-08-11 12:26:28 -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/_static/images/logo-readme.png">
     </p>
   </a>

   <a href="https://bestpractices.coreinfrastructure.org/projects/74"><img
   src="https://bestpractices.coreinfrastructure.org/projects/74/badge"></a>
   <a href="https://buildkite.com/zephyr/zephyr">
   <img
   src="https://badge.buildkite.com/f5bd0dc88306cee17c9b38e78d11bb74a6291e3f40e7d13f31.svg?branch=main"></a>


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


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.

.. start_include_here

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
  (buildkite) 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/2vue8666
.. _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/getting_started/index.html#asking-for-help