# How to become a contributor and submit your own code
## Contributor License Agreements
We'd love to accept your patches! Before we can take them, we have to jump a
couple of legal hurdles.
Please fill out either the individual or corporate Contributor License Agreement
(CLA).
* If you are an individual writing original source code and you're sure you
own the intellectual property, then you'll need to sign an
[individual CLA](https://developers.google.com/open-source/cla/individual).
* If you work for a company that wants to allow you to contribute your work,
then you'll need to sign a
[corporate CLA](https://developers.google.com/open-source/cla/corporate).
Follow either of the two links above to access the appropriate CLA and
instructions for how to sign and return it. Once we receive it, we'll be able to
accept your pull requests.
## Are you a Googler?
If you are a Googler, please make an attempt to submit an internal change rather
than a GitHub Pull Request. If you are not able to submit an internal change a
PR is acceptable as an alternative.
## Contributing A Patch
1. Submit an issue describing your proposed change to the
[issue tracker](https://github.com/google/googletest).
2. Please don't mix more than one logical change per submittal, because it
makes the history hard to follow. If you want to make a change that doesn't
have a corresponding issue in the issue tracker, please create one.
3. Also, coordinate with team members that are listed on the issue in question.
This ensures that work isn't being duplicated and communicating your plan
early also generally leads to better patches.
4. If your proposed change is accepted, and you haven't already done so, sign a
Contributor License Agreement (see details above).
5. Fork the desired repo, develop and test your code changes.
6. Ensure that your code adheres to the existing style in the sample to which
you are contributing.
7. Ensure that your code has an appropriate set of unit tests which all pass.
8. Submit a pull request.
## The Google Test and Google Mock Communities
The Google Test community exists primarily through the
[discussion group](http://groups.google.com/group/googletestframework) and the
GitHub repository. Likewise, the Google Mock community exists primarily through
their own [discussion group](http://groups.google.com/group/googlemock). You are
definitely encouraged to contribute to the discussion and you can also help us
to keep the effectiveness of the group high by following and promoting the
guidelines listed here.
### Please Be Friendly
Showing courtesy and respect to others is a vital part of the Google culture,
and we strongly encourage everyone participating in Google Test development to
join us in accepting nothing less. Of course, being courteous is not the same as
failing to constructively disagree with each other, but it does mean that we
should be respectful of each other when enumerating the 42 technical reasons
that a particular proposal may not be the best choice. There's never a reason to
be antagonistic or dismissive toward anyone who is sincerely trying to
contribute to a discussion.
Sure, C++ testing is serious business and all that, but it's also a lot of fun.
Let's keep it that way. Let's strive to be one of the friendliest communities in
all of open source.
As always, discuss Google Test in the official GoogleTest discussion group. You
don't have to actually submit code in order to sign up. Your participation
itself is a valuable contribution.
## Style
To keep the source consistent, readable, diffable and easy to merge, we use a
fairly rigid coding style, as defined by the
[google-styleguide](https://github.com/google/styleguide) project. All patches
will be expected to conform to the style outlined
[here](https://google.github.io/styleguide/cppguide.html). Use
[.clang-format](https://github.com/google/googletest/blob/master/.clang-format)
to check your formatting
## Requirements for Contributors
If you plan to contribute a patch, you need to build Google Test, Google Mock,
and their own tests from a git checkout, which has further requirements:
* [Python](https://www.python.org/) v2.3 or newer (for running some of the
tests and re-generating certain source files from templates)
* [CMake](https://cmake.org/) v2.6.4 or newer
## Developing Google Test and Google Mock
This section discusses how to make your own changes to the Google Test project.
### Testing Google Test and Google Mock Themselves
To make sure your changes work as intended and don't break existing
functionality, you'll want to compile and run Google Test and GoogleMock's own
tests. For that you can use CMake:
mkdir mybuild
cd mybuild
cmake -Dgtest_build_tests=ON -Dgmock_build_tests=ON ${GTEST_REPO_DIR}
To choose between building only Google Test or Google Mock, you may modify your
cmake command to be one of each
cmake -Dgtest_build_tests=ON ${GTEST_DIR} # sets up Google Test tests
cmake -Dgmock_build_tests=ON ${GMOCK_DIR} # sets up Google Mock tests
Make sure you have Python installed, as some of Google Test's tests are written
in Python. If the cmake command complains about not being able to find Python
(`Could NOT find PythonInterp (missing: PYTHON_EXECUTABLE)`), try telling it
explicitly where your Python executable can be found:
cmake -DPYTHON_EXECUTABLE=path/to/python ...
Next, you can build Google Test and / or Google Mock and all desired tests. On
\*nix, this is usually done by
make
To run the tests, do
make test
All tests should pass.
### Regenerating Source Files
Some of Google Test's source files are generated from templates (not in the C++
sense) using a script. For example, the file
include/gtest/internal/gtest-type-util.h.pump is used to generate
gtest-type-util.h in the same directory.
You don't need to worry about regenerating the source files unless you need to
modify them. You would then modify the corresponding `.pump` files and run the
'[pump.py](googletest/scripts/pump.py)' generator script. See the
[Pump Manual](googletest/docs/pump_manual.md).
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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file hal_pwm.c
* @brief PWM Driver code.
*
* @addtogroup PWM
* @{
*/
#include "hal.h"
#if (HAL_USE_PWM == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief PWM Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void pwmInit(void) {
pwm_lld_init();
}
/**
* @brief Initializes the standard part of a @p PWMDriver structure.
*
* @param[out] pwmp pointer to a @p PWMDriver object
*
* @init
*/
void pwmObjectInit(PWMDriver *pwmp) {
pwmp->state = PWM_STOP;
pwmp->config = NULL;
pwmp->enabled = 0;
pwmp->channels = 0;
#if defined(PWM_DRIVER_EXT_INIT_HOOK)
PWM_DRIVER_EXT_INIT_HOOK(pwmp);
#endif
}
/**
* @brief Configures and activates the PWM peripheral.
* @note Starting a driver that is already in the @p PWM_READY state
* disables all the active channels.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] config pointer to a @p PWMConfig object
*
* @api
*/
void pwmStart(PWMDriver *pwmp, const PWMConfig *config) {
osalDbgCheck((pwmp != NULL) && (config != NULL));
osalSysLock();
osalDbgAssert((pwmp->state == PWM_STOP) || (pwmp->state == PWM_READY),
"invalid state");
pwmp->config = config;
pwmp->period = config->period;
pwm_lld_start(pwmp);
pwmp->enabled = 0;
pwmp->state = PWM_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the PWM peripheral.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*
* @api
*/
void pwmStop(PWMDriver *pwmp) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert((pwmp->state == PWM_STOP) || (pwmp->state == PWM_READY),
"invalid state");
pwm_lld_stop(pwmp);
pwmp->enabled = 0;
pwmp->config = NULL;
pwmp->state = PWM_STOP;
osalSysUnlock();
}
/**
* @brief Changes the period the PWM peripheral.
* @details This function changes the period of a PWM unit that has already
* been activated using @p pwmStart().
* @pre The PWM unit must have been activated using @p pwmStart().
* @post The PWM unit period is changed to the new value.
* @note If a period is specified that is shorter than the pulse width
* programmed in one of the channels then the behavior is not
* guaranteed.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] period new cycle time in ticks
*
* @api
*/
void pwmChangePeriod(PWMDriver *pwmp, pwmcnt_t period) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "invalid state");
pwmChangePeriodI(pwmp, period);
osalSysUnlock();
}
/**
* @brief Enables a PWM channel.
* @pre The PWM unit must have been activated using @p pwmStart().
* @post The channel is active using the specified configuration.
* @note Depending on the hardware implementation this function has
* effect starting on the next cycle (recommended implementation)
* or immediately (fallback implementation).
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
* @param[in] width PWM pulse width as clock pulses number
*
* @api
*/
void pwmEnableChannel(PWMDriver *pwmp,
pwmchannel_t channel,
pwmcnt_t width) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
pwmEnableChannelI(pwmp, channel, width);
osalSysUnlock();
}
/**
* @brief Disables a PWM channel and its notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @post The channel is disabled and its output line returned to the
* idle state.
* @note Depending on the hardware implementation this function has
* effect starting on the next cycle (recommended implementation)
* or immediately (fallback implementation).
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
*
* @api
*/
void pwmDisableChannel(PWMDriver *pwmp, pwmchannel_t channel) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
pwmDisableChannelI(pwmp, channel);
osalSysUnlock();
}
/**
* @brief Enables the periodic activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @note If the notification is already enabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*
* @api
*/
void pwmEnablePeriodicNotification(PWMDriver *pwmp) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert(pwmp->config->callback != NULL, "undefined periodic callback");
pwmEnablePeriodicNotificationI(pwmp);
osalSysUnlock();
}
/**
* @brief Disables the periodic activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @note If the notification is already disabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*
* @api
*/
void pwmDisablePeriodicNotification(PWMDriver *pwmp) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert(pwmp->config->callback != NULL, "undefined periodic callback");
pwmDisablePeriodicNotificationI(pwmp);
osalSysUnlock();
}
/**
* @brief Enables a channel de-activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @pre The channel must have been activated using @p pwmEnableChannel().
* @note If the notification is already enabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
*
* @api
*/
void pwmEnableChannelNotification(PWMDriver *pwmp, pwmchannel_t channel) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert((pwmp->enabled & ((pwmchnmsk_t)1U << (pwmchnmsk_t)channel)) != 0U,
"channel not enabled");
osalDbgAssert(pwmp->config->channels[channel].callback != NULL,
"undefined channel callback");
pwmEnableChannelNotificationI(pwmp, channel);
osalSysUnlock();
}
/**
* @brief Disables a channel de-activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @pre The channel must have been activated using @p pwmEnableChannel().
* @note If the notification is already disabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
*
* @api
*/
void pwmDisableChannelNotification(PWMDriver *pwmp, pwmchannel_t channel) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert((pwmp->enabled & ((pwmchnmsk_t)1U << (pwmchnmsk_t)channel)) != 0U,
"channel not enabled");
osalDbgAssert(pwmp->config->channels[channel].callback != NULL,
"undefined channel callback");
pwmDisableChannelNotificationI(pwmp, channel);
osalSysUnlock();
}
#endif /* HAL_USE_PWM == TRUE */
/** @} */
|